JP2012083011A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heating ability of an air conditioner while hardly giving a feeling of draft to a user.SOLUTION: The air conditioner 1 includes an indoor unit 2 and an outdoor unit 3 coupled to the indoor unit via a refrigerant circuit. The indoor unit 2 includes: a heat exchanger 20 and a radiation panel 22 each having a part of pipes constituting the refrigerant circuit; and a fan 21 disposed near the heat exchanger 20. The air conditioner 1 can operate: hot-air heating to perform hot-air heating by introducing a refrigerant into the heat exchanger 20, not into the radiation panel 22; radiation heating to perform hot-air heating by introducing the refrigerant into the heat exchanger 20 and to perform radiation heating by introducing the refrigerant into the radiation panel 22; and radiation breeze heating to perform hot-air heating by introducing the refrigerant into the heat exchanger 20 and to perform radiation heating by introducing the refrigerant into the radiation panel 22, while reducing the amount of air blown by the fan 21 less than in the radiation heating operation and in the hot-air heating operation.

Description

  The present invention relates to an air conditioner including a heat exchanger, a fan, and a radiation panel.

  As an indoor unit of an air conditioner, an indoor unit having a heat exchanger and a radiation panel each having a part of piping constituting a refrigerant circuit, and an indoor fan disposed in the vicinity of the heat exchanger is known ( For example, Patent Document 1). This air conditioner has a fan / panel mode that performs both hot air heating and radiant heating, an automatic mode that automatically switches between hot air heating and radiant heating, and hot air heating. One of the panel modes for performing only radiant heating can be set. When only radiant heating is performed and hot air heating is not performed, the operation of the indoor fan is stopped. Further, when only radiant heating is performed, the operation frequency of the compressor is set lower than when both hot air heating and radiant heating are performed.

Japanese Unexamined Patent Publication No. Sho 63-113239

However, when performing radiant heating without performing hot air heating, if the operating frequency of the compressor is lowered, the capability of radiant heating may be insufficient and sufficient heating may not be performed. Also, when the operating frequency of the compressor is increased to increase the capacity of radiant heating, the indoor fan is stopped, so the amount of refrigerant heat exchange in the heat exchanger is small, and the pressure in the refrigerant circuit is high. turn into. Therefore, there arises a problem that the operation of the air conditioner stops due to a high pressure abnormality.
Also, if both hot air heating and radiant heating are performed, the operating frequency of the compressor can be raised, and these problems can be solved, but normal hot air heating gives a draft feeling, so heating without a draft feeling Couldn't answer user's request for

  Then, the objective of this invention is providing the air conditioner which can improve a heating capability, without almost feeling a draft feeling.

  An air conditioner according to a first aspect of the present invention is an air conditioner including an indoor unit and an outdoor unit connected to the indoor unit via a refrigerant circuit, and the indoor unit constitutes the refrigerant circuit. A heat exchanger and a radiant panel each having a part of the piping to be heated, and a fan disposed in the vicinity of the heat exchanger, flowing a refrigerant through the heat exchanger to perform hot air heating, and During the radiant heating operation, the radiant heating operation is performed by flowing a refrigerant through the radiant panel to perform radiant heating, the hot air is heated by flowing the refrigerant through the heat exchanger, and the radiant heating is performed by flowing the refrigerant through the radiant panel. Further, it is possible to perform a radiant light breeze heating operation in which a radiant breeze heating with a reduced air volume generated by the fan is possible.

  In this air conditioner, the amount of air generated by the fan is reduced during the radiant light air heating operation, so that it is possible to perform hot air heating that makes the user feel almost no draft. Moreover, since the amount of heat exchange by the heat exchanger is large because the fan is not stopped, the pressure in the refrigerant circuit can be prevented from becoming too high. Therefore, the rotation speed of the compressor of the outdoor unit can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the fan stopped.

  An air conditioner according to a second invention is the air conditioner according to the first invention, based on an indoor temperature sensor that detects a temperature of a room in which the indoor unit is installed, and an indoor temperature detected by the indoor temperature sensor, Switching means for switching between the radiant heating operation and the radiant light breeze heating operation is provided.

  In this air conditioner, it is possible to switch between the radiant heating operation and the radiant light wind heating according to the room temperature so that the radiant heating operation is performed when the room temperature is low and the radiant light wind heating operation is performed when the room temperature is high. it can. As a result, when the room temperature is low, the room temperature can be quickly raised, and when the room temperature becomes high, it is possible to automatically switch to heating with almost no draft feeling.

  An air conditioner according to a third invention relates to the compressor provided in the outdoor unit, the control means for controlling the compressor, and the pressure in the heat exchanger in the first or second invention. Storage means storing an upper limit value, and when at least one of the radiant heating operation and the radiant breeze heating operation is performed, the control means is configured to set the pressure in the heat exchanger to the upper limit value. The compressor is controlled so as to substantially match the corresponding pressure.

  In this air conditioner, the heating capacity can be improved because the compressor is controlled so that the pressure in the refrigerant circuit substantially coincides with the upper limit pressure during the radiant heating operation or the radiant wind heating operation.

  An air conditioner according to a fourth invention is the air conditioner according to the third invention, further comprising a heat exchange temperature sensor provided in the heat exchanger, wherein the storage means is the upper limit value for the pressure in the heat exchanger. The upper limit temperature of the heat exchange temperature in the heat exchanger is stored, and when at least one of the radiant heating operation and the radiant light breeze heating operation is performed, the control means is the heat exchange temperature sensor. The compressor is controlled so that the detected heat exchange temperature substantially coincides with the upper limit temperature.

  In this air conditioner, the pressure in the refrigerant circuit is controlled to substantially match the upper limit pressure by controlling the compressor so that the heat exchange temperature detected by the heat exchange temperature sensor substantially matches the upper limit temperature. be able to.

  An air conditioner according to a fifth aspect of the present invention is an air conditioner including an indoor unit and an outdoor unit connected to the indoor unit via a refrigerant circuit, and the indoor unit constitutes the refrigerant circuit. A heat exchanger and a radiant panel each having a part of a pipe to be circulated, and a fan disposed in the vicinity of the heat exchanger, and the refrigerant is supplied to the heat exchanger without flowing the refrigerant through the radiant panel. And hot air heating operation for flowing hot air and flowing a refrigerant to the heat exchanger to perform hot air heating and flowing a refrigerant to the radiation panel to perform radiant heating, and from the time of the hot air heating operation It is possible to perform a radiant light breeze heating operation in which a radiant light breeze heating with a reduced air volume generated by a fan is possible.

  In this air conditioner, the amount of air generated by the fan is reduced during the radiant light air heating operation, so that it is possible to perform hot air heating that makes the user feel almost no draft. Moreover, since the amount of heat exchange by the heat exchanger is large because the fan is not stopped, the pressure in the refrigerant circuit can be prevented from becoming too high. Therefore, the rotation speed of the compressor of the outdoor unit can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the fan stopped.

  The air conditioner according to a sixth aspect of the present invention is the air conditioner according to the fifth aspect, wherein an upper limit value for the pressure in the compressor provided in the outdoor unit, the control means for controlling the compressor, and the pressure in the heat exchanger is Stored in the storage means, and when the radiant breeze heating operation is performed, the control means compresses the pressure so that the pressure in the heat exchanger substantially matches the pressure corresponding to the upper limit value. It is characterized by controlling the machine.

  In this air conditioner, during the radiant light wind heating operation, the compressor is controlled so that the pressure in the refrigerant circuit substantially matches the upper limit pressure, so that the heating capacity can be improved.

  An air conditioner according to a seventh aspect of the present invention is the air conditioner according to the sixth aspect, further comprising a heat exchange temperature sensor provided in the heat exchanger, wherein the storage means is the upper limit value for the pressure in the heat exchanger. The upper limit temperature of the heat exchange temperature in the heat exchanger is stored, and when the radiant breeze heating operation is performed, the control means detects the heat exchange temperature detected by the heat exchange temperature sensor. The compressor is controlled so as to substantially coincide with an upper limit temperature.

  In this air conditioner, the pressure in the refrigerant circuit is controlled to substantially match the upper limit pressure by controlling the compressor so that the heat exchange temperature detected by the heat exchange temperature sensor substantially matches the upper limit temperature. be able to.

  An air conditioner according to an eighth aspect of the present invention is the air conditioner according to any one of the first to seventh aspects, further comprising a valve mechanism that adjusts an amount of refrigerant supplied to the radiation panel, wherein the radiation circuit includes: The valve mechanism and the heat exchanger are provided in parallel.

  In this air conditioner, since the radiation panel and the valve mechanism are provided in parallel with the heat exchanger, only the warm air heating operation without flowing the refrigerant to the radiation panel and the radiation heating operation for flowing the refrigerant to the radiation panel are performed. Alternatively, the operation can be switched between the radiant breeze heating operation only by opening and closing the valve mechanism.

  As described above, according to the present invention, the following effects can be obtained.

  In the first and fifth aspects of the invention, since the air volume generated by the fan is reduced during the radiant light air heating operation, it is possible to perform hot air heating that hardly causes the user to feel a draft. Moreover, since the amount of heat exchange by the heat exchanger is large because the fan is not stopped, the pressure in the refrigerant circuit can be prevented from becoming too high. Therefore, the rotation speed of the compressor of the outdoor unit can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the fan stopped.

  According to the second aspect of the invention, the radiant heating operation and the radiant breeze heating can be switched according to the room temperature so that the radiant heating operation is performed when the room temperature is low and the radiant breeze heating operation is performed when the room temperature is high. it can. As a result, when the room temperature is low, the room temperature can be quickly raised, and when the room temperature becomes high, it is possible to automatically switch to heating with almost no draft feeling.

  In the third and sixth inventions, the heating capacity can be improved because the compressor is controlled so that the pressure in the refrigerant circuit substantially coincides with the upper limit pressure during the radiant heating operation or during the radiant breeze heating operation. .

  In the fourth and seventh inventions, by controlling the compressor so that the heat exchange temperature detected by the heat exchange temperature sensor substantially matches the upper limit temperature, the pressure in the refrigerant circuit almost matches the upper limit pressure. Can be controlled.

  In the eighth invention, since the radiant panel and the valve mechanism are provided in parallel with the heat exchanger, an operation in which only the hot air heating is performed without flowing the refrigerant through the radiant panel, and a radiant heating operation in which the refrigerant flows through the radiant panel are performed. Alternatively, the operation can be switched between the radiant breeze heating operation only by opening and closing the valve mechanism.

It is a circuit diagram showing the schematic structure of the air conditioner concerning the embodiment of the present invention, and is a figure showing the flow of the refrigerant at the time of cooling operation and hot air heating operation. It is a circuit diagram which shows schematic structure of the air conditioner which concerns on embodiment of this invention, Comprising: It is a figure which shows the flow of the refrigerant | coolant at the time of a radiation heating operation and a radiation breeze heating operation. It is a block diagram which shows schematic structure of the control part which controls an air conditioner. It is a graph which shows operation | movement of each part of an air conditioner at the time of a radiation 1 operation mode driving | operation, room temperature, and a radiation panel temperature. It is a graph which shows operation | movement of each part of an air conditioner at the time of a radiation 2 operation mode driving | operation, room temperature, and a radiation panel temperature.

  Hereinafter, an embodiment of an air conditioner 1 according to the present invention will be described.

<Overall configuration of the air conditioner 1>
As shown in FIGS. 1 and 2, the air conditioner 1 of this embodiment includes an indoor unit 2 installed indoors, an outdoor unit 3 installed outdoor, and a remote controller 4 (see FIG. 3). ing. The indoor unit 2 detects an indoor heat exchanger 20, an indoor fan 21 disposed in the vicinity of the indoor heat exchanger 20, a radiation panel 22, an indoor electric valve (valve mechanism) 23, and an indoor air temperature. The indoor temperature sensor 24 is provided. The outdoor unit 3 includes a compressor 30, a four-way switching valve 31, an outdoor heat exchanger 32, an outdoor fan 33 disposed in the vicinity of the outdoor heat exchanger 32, and an outdoor electric valve 34. Yes.

In the air conditioner 1, the indoor heat exchanger 20, the compressor 30, the four-way switching valve 31, the outdoor heat exchanger 32, and the outdoor electric valve 34 are connected to form an annular refrigerant circuit 10. In the refrigerant circuit 10, the pipes on both sides of the indoor heat exchanger 20 are connected by the bypass pipe 11.
The bypass pipe 11 is provided with a radiation panel 22 and an indoor motor operated valve 23. A panel entry temperature sensor 25 and a panel exit temperature sensor 26 are attached to both sides of the radiation panel 22 in the bypass pipe 11. Further, an accumulator 35 is interposed between the suction side of the compressor 30 and the four-way switching valve 31 in the refrigerant circuit 10, and the discharge side of the compressor 30 and the four-way switching valve 31 in the refrigerant circuit 10 are interposed. A discharge temperature sensor 36 is attached between them. An outdoor heat exchanger temperature sensor 28 is attached to the outdoor heat exchanger 32.

  The indoor heat exchanger 20 has a pipe that constitutes a part of the refrigerant circuit, and an indoor heat exchanger temperature sensor 27 is attached thereto. The indoor heat exchanger 20 is disposed on the windward side of the indoor fan 21. The air heated or cooled by heat exchange with the indoor heat exchanger 20 is blown into the room as warm air or cold air by the indoor fan 21, whereby hot air heating or cooling is performed.

  The radiation panel 22 is arrange | positioned at the surface side of the indoor unit 2, and has piping which comprises a part of refrigerant circuit. Radiant heating is performed by radiating the heat of the refrigerant flowing through the pipe into the room. The indoor motor operated valve 23 is provided to adjust the flow rate of the refrigerant supplied to the radiation panel 22.

  The air conditioner 1 of the present embodiment can perform a cooling operation, a warm air heating operation, a radiant heating operation, and a radiant light wind heating operation. The cooling operation is an operation in which the refrigerant is allowed to flow through the indoor heat exchanger 20 without flowing the refrigerant through the radiant panel 22, and the hot air heating operation is the indoor heat exchanger without flowing the refrigerant through the radiant panel 22. 20 is an operation in which a refrigerant is passed through to perform hot air heating. The radiant heating operation is an operation in which the refrigerant is passed through the indoor heat exchanger 20 to perform hot air heating, and the refrigerant is passed through the radiant panel 22 to perform radiant heating. The radiant breeze heating operation is an operation in which the warm air heating is performed with a lower air volume than in the warm air heating operation and the radiant heating operation, and the refrigerant is passed through the radiant panel 22 to perform the radiant heating.

The flow of the refrigerant in the refrigerant circuit during each operation will be described with reference to FIGS. 1 and 2.
During the cooling operation, the indoor electric valve 23 is closed, and the four-way switching valve 31 is switched to the state indicated by the broken line in FIG. Therefore, as indicated by the dashed arrows in FIG. 1, the high-temperature and high-pressure refrigerant discharged from the compressor 30 flows into the outdoor heat exchanger 32 through the four-way switching valve 31. The refrigerant condensed in the outdoor heat exchanger 32 is decompressed by the outdoor motor operated valve 34 and then flows into the indoor heat exchanger 20. Then, the refrigerant evaporated in the indoor heat exchanger 20 flows into the compressor 30 via the four-way switching valve 31 and the accumulator 35.

  During the hot air heating operation, the indoor motor operated valve 23 is closed and the four-way switching valve 31 is switched to the state shown by the solid line in FIG. Therefore, as indicated by the solid arrow in FIG. 1, the high-temperature and high-pressure refrigerant discharged from the compressor 30 flows into the indoor heat exchanger 20 through the four-way switching valve 31. The refrigerant condensed in the indoor heat exchanger 20 is decompressed by the outdoor motor operated valve 34 and then flows into the outdoor heat exchanger 32. The refrigerant evaporated in the outdoor heat exchanger 32 flows into the compressor 30 via the four-way switching valve 31 and the accumulator 35.

  During the radiant heating operation and the radiant breeze heating operation, the indoor motor-operated valve 23 is opened, and the four-way switching valve 31 is switched to the state indicated by the solid line in FIG. Therefore, as indicated by the solid arrows in FIG. 2, the high-temperature and high-pressure refrigerant discharged from the compressor 30 flows into the indoor heat exchanger 20 and the radiation panel 22 through the four-way switching valve 31. Then, the refrigerant condensed in the indoor heat exchanger 20 and the radiation panel 22 is decompressed by the outdoor motor operated valve 34 and then flows into the outdoor heat exchanger 32. The refrigerant evaporated in the outdoor heat exchanger 32 flows into the compressor 30 via the four-way switching valve 31 and the accumulator 35.

<Remote control 4>
In the remote controller 4, the user performs operation start / stop operation, operation mode setting, indoor temperature target temperature setting (indoor set temperature), blowing air volume setting, and the like. As shown in Table 1, in the air conditioner 1 of the present embodiment, either the cooling operation mode or the heating operation mode can be selected as the main operation mode by operating the remote controller 4.

  When the heating operation mode is selected as the main operation mode, as shown in Table 1, one of the warm air heating operation mode and the radiation 1 operation mode and the radiation 2 operation mode included in the radiant heating operation mode can be selected. It is like that.

  As shown in Table 1, the cooling operation mode is a mode for performing cooling operation, the warm air heating operation mode is a mode for performing warm air heating operation, and the radiation 1 operation mode is determined according to the room temperature. A mode for switching between a radiant heating operation and a radiant breeze heating operation, and the radiant 2 operation mode is a mode for performing a radiant breeze heating operation. In addition, when the hot air heating operation mode or the cooling operation mode is selected, any of “air volume automatic”, “strong”, and “weak” can be selected as the air volume setting. In the present embodiment, the air volume is automatically controlled when the radiation 1 operation mode or the radiation 2 operation mode is selected.

<Control unit 5>
Next, the control part 5 which controls the air conditioner 1 is demonstrated, referring FIG.
As shown in FIG. 3, the control unit 5 includes a storage unit (storage unit) 50, an operation mode control unit (switching unit) 51, an indoor motorized valve control unit 52, an indoor fan control unit 53, and a compressor control. Unit (control means) 54 and outdoor electric valve control unit 55.

(Storage unit 50)
The storage unit 50 stores various operation settings related to the air conditioner 1, control programs, data tables necessary for executing the control programs, and the like. The operation settings include those set by operating the remote controller 4 by the user, such as a target temperature of the room temperature (room set temperature), and those set in advance for the air conditioner 1. . In the air conditioner 1 of this embodiment, the target temperature range of the radiation panel 22 is set in advance to a predetermined temperature range (for example, 50 to 55 ° C.). Note that the target temperature range of the radiation panel 22 may be set by operating the remote controller 4. The storage unit 50 stores the upper limit temperature of the heat exchange temperature in the indoor heat exchanger 20 corresponding to the upper limit pressure in the indoor heat exchanger 20.

(Operation mode control unit 51)
The operation mode control unit 51 starts the cooling operation, the heating operation, or the radiant light wind heating operation when the operation of starting the cooling operation mode, the warm air heating operation mode, or the radiation 2 operation mode is performed by the remote controller 4. .
In addition, when the operation of starting the radiation 1 operation mode is performed by the remote controller 4, the operation mode control unit 51 starts the radiant heating operation when the indoor temperature detected by the indoor temperature sensor 24 is lower than the indoor set temperature. In addition, when the room temperature is equal to or higher than the indoor set temperature, the radiant light wind heating operation is started.
In the air conditioner 1 of the present embodiment, when the operation is started by operating the remote controller 4, the heating operation is not started when the room temperature is higher than the indoor set temperature by a predetermined temperature Tb or more.

Further, the operation mode control unit 51 radiates from the radiant heating operation when the room temperature detected by the room temperature sensor 24 becomes equal to or higher than the indoor set temperature during the radiant heating operation during the radiant one operation mode operation. In addition to switching to the breeze heating operation, when the room temperature becomes lower than the indoor set temperature by a predetermined temperature Ta or more during the radiant breeze heating operation, the radiant breeze heating operation is switched to the radiant heating operation.
Further, the operation mode control unit 51 automatically stops the operation (thermo-off) when the room temperature becomes higher than the indoor set temperature by a predetermined temperature Tb or more during the heating operation, and then the room temperature. When the temperature drops to the indoor set temperature, the operation is started again (thermo-on).

(Indoor motorized valve controller 52)
The indoor motorized valve control unit 52 controls the opening degree of the indoor motorized valve 23. As shown in Table 2, the indoor motor-operated valve control unit 52 closes the indoor motor-operated valve 23 during the cooling operation or the hot air heating operation. Table 2 shows control states of the indoor motor operated valve 23, the indoor fan 21, and the compressor 30 during each operation.

  As shown in Table 2, the indoor motor-operated valve control unit 52 controls the opening degree of the indoor motor-operated valve 23 based on the temperature of the radiation panel 22 during the radiation heating operation or the radiation breeze heating operation. Specifically, the surface temperature (predicted value) of the radiation panel 22 is calculated based on the average value of the temperatures detected by the panel entry temperature sensor 25 and the panel exit temperature sensor 26, and the surface temperature of the radiation panel 22 is calculated. Of the indoor motor-operated valve 23 is controlled so that the predicted value (hereinafter, simply referred to as a radiant panel temperature) falls within a panel target temperature range (eg, 50 to 55 ° C.). As the radiant panel temperature is lower than the panel target temperature range, the indoor motor-operated valve control unit 52 controls the opening of the indoor motor-operated valve 23 so that the flow rate of the refrigerant supplied to the radiant panel 22 increases. However, the indoor motor-operated valve control unit 52 controls the indoor motor-operated valve 23 to the initial opening until the predetermined time t1 has elapsed from the start of the operation (when the operation is started by operating the remote controller 4 or when the operation is started by thermo-on). . In this embodiment, in order to calculate the radiation panel temperature, both the detected temperature of the panel input temperature sensor 25 and the panel output temperature sensor 26 are used, but only the detected temperature of the panel input temperature sensor 25 is used. Alternatively, only the temperature detected by the panel temperature sensor 26 may be used.

(Indoor fan control unit 53)
The indoor fan control unit 53 controls the rotational speed of the indoor fan 21. Table 3 shows the fan taps selected during the automatic air volume operation, the radiant heating operation, and the radiant light air heating operation of the hot air heating operation, and the rotation speeds corresponding to the fan taps.

  During the air volume automatic operation of the hot air heating operation, the indoor fan control unit 53 selects one of the five stages of fan taps A1 to A5 shown in Table 3 based on the indoor temperature or the indoor set temperature detected by the indoor temperature sensor 24. And the indoor fan 21 is controlled to the number of rotations (a1 to a5) corresponding to the fan tap. Further, in the warm air heating operation, when “strong” or “weak” is set as the air volume setting, a preset fan tap is determined respectively.

  In addition, during the air volume automatic operation during the cooling operation, the indoor fan control unit 53 selects one of a plurality of preset fan taps based on the indoor temperature, the indoor set temperature, or the like detected by the indoor temperature sensor 24. And the indoor fan 21 is controlled to the rotation speed corresponding to this fan tap. Further, in the cooling operation, when “strong” or “weak” is set as the air volume setting, a preset fan tap is determined respectively.

  In addition, during the radiant heating operation, the indoor fan control unit 53 selects one of the seven stages of fan taps B1 to B7 shown in Table 3 based on the indoor temperature or the indoor set temperature detected by the indoor temperature sensor 24. And the indoor fan 21 is controlled to the rotation speed (b1-b7) corresponding to this fan tap.

  Moreover, at the time of a radiation breeze heating operation, the indoor fan control part 53 controls the indoor fan 21 to the rotation speed c1 corresponding to the fan tap C1 shown in Table 3. The rotation speed c1 is smaller than any of the rotation speeds a1 to a5 during the hot air heating operation and the rotation speeds b1 to b7 during the radiant heating operation. The rotation speed c1 is a value at which almost no sound is generated due to the rotation of the indoor fan 21 and the draft feeling is hardly felt.

(Compressor control unit 54)
The compressor control unit 54 controls the operating frequency of the compressor 30.
During the hot air heating operation and the cooling operation, the frequency of the compressor 30 is controlled based on the room temperature, the indoor set temperature, and the like. Specifically, the compressor control unit 54 controls the compressor 30 such that the frequency of the compressor 30 increases as the difference between the indoor temperature and the indoor set temperature increases.

  Further, at the time of the radiant heating operation and the radiant breeze heating operation, the compressor control unit 54 causes the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 to substantially coincide with the upper limit temperature corresponding to the upper limit pressure in the refrigerant circuit. The compressor 30 is controlled as described above (this control is referred to as upper limit control). Specifically, the frequency of the compressor 30 is controlled by the control based on the indoor temperature and the indoor set temperature so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 exceeds the upper limit temperature. Also, the heat exchange temperature is controlled so as to become a value near the upper limit temperature without exceeding the upper limit temperature.

(Outdoor motorized valve controller 55)
The outdoor electric valve control unit 55 controls the opening degree of the outdoor electric valve 34 based on the indoor temperature, the indoor set temperature, and the like.

<Operation of the air conditioner 1>
Next, operation | movement of each heating operation mode of the air conditioner 1 is demonstrated. The radiation 1 operation mode and the radiation 2 operation mode will be described with reference to the graphs of FIGS. 4 and 5. 4 and 5, the horizontal axis indicates time, and the vertical axis indicates the indoor temperature, the rotational speed of the indoor fan 21, the operating frequency of the compressor 30, the radiation panel temperature, and the opening degree of the indoor motor operated valve 23. Each is shown.

(Hot air heating operation mode operation)
When the operation of starting the warm air heating operation mode is performed by the remote controller 4 and “automatic air volume” is selected as the air volume setting, the indoor fan control unit 53 causes the indoor fan 21 to be fan-tapped according to the indoor temperature. The rotational speed is controlled to correspond to any one of A1 to A5. Further, the compressor control unit 54 controls the compressor 30 such that the operating frequency increases as the difference between the room temperature and the room set temperature increases. Moreover, the indoor motor operated valve 23 is closed.

  In addition, when the operation of starting the warm air heating operation mode is performed by the remote controller 4 and “strong” or “weak” is selected as the air volume setting, the indoor motor-operated valve 23 and the compressor 30 are set to “automatic air volume”. The indoor fan 21 is controlled by the indoor fan control unit 53 to a rotational speed corresponding to a predetermined fan tap.

(Radiation 1 operation mode operation)
As shown in FIG. 4, when the operation of starting the radiation 1 operation mode is performed by the remote controller 4, the radiation heating operation is started when the indoor temperature at the start of the operation is lower than the indoor set temperature. In this case, the indoor fan control unit 53 controls the indoor fan 21 to a rotational speed corresponding to any one of the fan taps B1 to B7 according to the indoor temperature and the indoor set temperature. Further, the compressor control unit 54 controls the compressor 30 so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 substantially coincides with the upper limit temperature (upper limit control is performed). Further, the indoor motor-operated valve control unit 52 controls the indoor motor-operated valve 23 to the initial opening until a predetermined time t1 has elapsed from the start of operation, and when the predetermined time t1 has elapsed from the start of operation, the radiant panel temperature changes to the panel. The opening degree is controlled to be within the target temperature range. In FIG. 4, the initial opening degree of the indoor motor operated valve 23 is smaller than the fully open position, but the initial opening degree may be fully opened.

  When the room temperature reaches the indoor set temperature during the radiant heating operation, the radiant heating operation is switched to the radiant light breeze heating operation. Thereby, the indoor fan control part 53 controls the indoor fan 21 to the rotation speed c1 corresponding to the fan tap C1. The indoor motor-operated valve control unit 52 and the compressor control unit 54 control the indoor motor-operated valve 23 and the compressor 30 in the same manner as before switching to the radiant light wind heating.

  When the indoor temperature further rises and the indoor set temperature becomes higher than the indoor set temperature by a predetermined temperature Tb or more, the operation is automatically stopped (thermo-off). Thereby, the indoor fan 21 and the compressor 30 are stopped, and the indoor motor-operated valve 23 is switched to the fully closed state. Thereafter, when the room temperature decreases to the indoor set temperature, the operation is started again (thermo-on). In FIG. 4, since the indoor temperature when the thermo is on is equal to or higher than the indoor set temperature, the radiant breeze heating operation is started, and the indoor motor-operated valve 23, the indoor fan 21, and the compressor 30 are controlled as before the thermo-off.

  When the indoor temperature becomes lower than the indoor set temperature by a predetermined temperature Ta or more during the radiant light wind heating operation, the radiant light wind heating operation is switched to the radiant heating operation. The fan 21 and the compressor 30 are controlled.

(Radiation 2 operation mode operation)
As shown in FIG. 5, when the operation of starting the radiation 2 operation mode is performed by the remote controller 4, the radiation breeze heating operation is started. The indoor fan control unit 53 controls the indoor fan 21 to the rotational speed c1 corresponding to the fan tap C1. Further, the compressor control unit 54 controls the compressor 30 so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 substantially coincides with the upper limit temperature (upper limit control is performed). Further, the indoor motor-operated valve control unit 52 controls the indoor motor-operated valve 23 to the initial opening until a predetermined time t1 has elapsed from the start of operation, and when the predetermined time t1 has elapsed from the start of operation, the radiant panel temperature changes to the panel. The opening degree is controlled to be within the target temperature range.

(Defrost operation)
Moreover, in the air conditioner 1, in order to remove the frost adhering to the outdoor heat exchanger 32 at the time of heating operation mode operation | movement, the four-way switching valve 31 is switched to the state shown with the broken line in FIG.1 and FIG.2, and heating operation is carried out. To defrost operation (defrost operation). In the air conditioner 1 of this embodiment, when performing a defrost operation, the indoor motor operated valve 23 is closed. Thereby, since a low-temperature refrigerant | coolant does not flow into the radiation panel 22, the temperature fall of the radiation panel 22 can be suppressed. Therefore, when the heating operation is started again, the temperature of the radiation panel 22 can be quickly brought within the panel target temperature range.

  In addition, control of the indoor motor operated valve 23 during the defrosting operation is not limited to this, and the indoor motor operated valve 23 is maintained at a predetermined opening degree until the radiation panel temperature reaches a predetermined temperature. When the temperature falls to the predetermined temperature, the indoor motor-operated valve 23 may be switched to a closed state. In this case, since a low-temperature refrigerant flows through the radiation panel 22, the temperature of the radiation panel 22 decreases to some extent, but the high-temperature refrigerant in the radiation panel 22 can be used for defrosting the outdoor heat exchanger 32. The frost adhering to the outdoor heat exchanger 32 can be removed more quickly than in the case described above. Moreover, it can prevent that frost adheres to the radiation panel 22 during a defrost operation.

<Characteristics of air conditioner 1>
According to the air conditioner 1 of the present embodiment described above, the amount of air generated by the indoor fan 21 is reduced during the radiant light air heating operation, so that it is possible to perform hot air heating that makes the user feel almost no draft. It is. Moreover, since the amount of heat exchange by the indoor heat exchanger 20 is large because the indoor fan 21 is not stopped, it is possible to prevent the pressure in the refrigerant circuit from becoming too high. Therefore, the rotation speed of the compressor 30 of the outdoor unit 3 can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the indoor fan 21 stopped.

  In the air conditioner 1 according to the present embodiment, the radiant heating operation and the radiant breeze heating are performed according to the room temperature so that the radiant heating operation is performed when the room temperature is low and the radiant breeze heating operation is performed when the room temperature is high. Is switched. As a result, when the room temperature is low, the room temperature can be quickly raised, and when the room temperature becomes high, it is possible to automatically switch to heating with almost no draft feeling.

  In the present embodiment, at the start of the radiation 1 operation mode operation, when the room temperature is lower than the indoor set temperature, the radiation heating operation is performed, and when the room temperature is equal to or higher than the indoor set temperature, the operation is switched to the radiation breeze heating operation. . Therefore, the room temperature can be quickly raised to the room set temperature.

  Moreover, in this embodiment, when the room temperature is lower than the indoor set temperature by a predetermined temperature Ta or more during the radiant breeze heating operation in the radiant 1 operation mode, the radiant breeze heating operation is switched to the radiant heating operation. Thereby, when the room temperature is lower than the indoor set temperature, the switching of the operation can be reduced and the radiant breeze heating operation can be continued rather than switching from the radiant breeze heating operation to the radiant heating operation.

  In the air conditioner 1 of the present embodiment, the compressor 30 is controlled so that the pressure in the refrigerant circuit substantially coincides with the upper limit pressure during the radiant heating operation or the radiant breeze heating operation, so that the heating capacity is improved. Can do. In the present embodiment, the pressure in the refrigerant circuit substantially matches the upper limit pressure by controlling the compressor 30 so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 substantially matches the upper limit temperature. Can be controlled.

  In the air conditioner 1 of the present embodiment, the radiant panel 22 and the indoor motor-operated valve 23 are provided in parallel with the indoor heat exchanger 20, so that hot air that performs only hot air heating without flowing refrigerant through the radiant panel 22. It is possible to switch between the heating operation and the radiant heating operation in which the refrigerant flows through the radiant panel 22 or the radiant breeze heating operation simply by opening and closing the indoor motor-operated valve 23.

  Moreover, in the air conditioner 1 of this embodiment, the number of fan taps (B1-B7) at the time of radiant heating operation is larger than the number of fan taps (A1-A5) at the time of warm air heating operation. That is, during the radiant heating operation, the rotational speed of the indoor fan 21 changes more finely than during the hot air heating operation. By finely changing the rotation speed of the indoor fan 21 during the radiant heating operation, it is possible to reduce the sound accompanying the rotation of the indoor fan 21 when switching from the radiant heating operation to the radiant light wind heating operation.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the above embodiment, when the room temperature is lower than the indoor set temperature by a predetermined temperature Tb or more during the radiant light breeze heating operation in the radiation 1 operation mode, the radiant breeze heating operation is switched to the radiant heating operation. When the temperature is lower than the indoor set temperature, the radiant breeze heating operation may be switched to the radiant heating operation.

  In the said embodiment, although the rotation speed of the indoor fan 21 at the time of radiation breeze heating operation is maintained by the rotation speed c1 set beforehand, if it is rotation speed smaller than the rotation speed of the indoor fan 21 at the time of radiation heating operation , May vary.

In the above embodiment, the heating operation includes a warm air heating operation, a radiant heating operation, and a radiant light wind heating operation, and the indoor air volume during the radiant light wind heating operation is the same as that during the warm air heating operation and during the radiant heating operation. Although the case where it is smaller than the indoor air volume has been described, the present invention is not limited to this.
Therefore, the heating operation includes a radiant heating operation and a radiant breeze heating operation, and the indoor air volume during the radiant breeze heating operation may be smaller than the indoor air volume during the radiant heating operation. In the above embodiment, as the operation mode, not only the radiation 1 operation mode and the radiation 2 heating operation mode but also other operation modes can be selected. In this case, the other operation modes may not be selected. Therefore, for example, a cooling operation mode or a warm air heating operation mode may not be selected as the operation mode.

  Further, as the heating operation, there is a warm air heating operation and a radiant light wind heating operation, and the indoor air volume during the radiant light wind heating operation may be smaller than the indoor air volume during the hot air heating operation. In the above embodiment, not only the warm air heating operation mode and the radiation 2 operation mode but also other operation modes can be selected as the operation mode, but in this case, other operation modes may not be selected. Therefore, for example, the cooling operation mode or the radiation 1 operation mode may not be selected as the operation mode.

  If the present invention is used, the heating capacity can be improved with almost no draft feeling.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 3 Outdoor unit 4 Remote control 20 Indoor heat exchanger (heat exchanger)
21 Indoor fans (fans)
22 Radiation panel 23 Indoor motorized valve (valve mechanism)
24 indoor temperature sensor 27 indoor heat exchange temperature sensor (heat exchange temperature sensor)
30 Compressor 50 Storage section (storage means)
51 Operation mode controller (switching means)
52 Indoor Electric Valve Control Unit 53 Indoor Fan Control Unit 54 Compressor Control Unit (Control Unit)

  The present invention relates to an air conditioner including a heat exchanger, a fan, and a radiation panel.

  As an indoor unit of an air conditioner, an indoor unit having a heat exchanger and a radiation panel each having a part of piping constituting a refrigerant circuit, and an indoor fan disposed in the vicinity of the heat exchanger is known ( For example, Patent Document 1). This air conditioner has a fan / panel mode that performs both hot air heating and radiant heating, an automatic mode that automatically switches between hot air heating and radiant heating, and hot air heating. One of the panel modes for performing only radiant heating can be set. When only radiant heating is performed and hot air heating is not performed, the operation of the indoor fan is stopped. Further, when only radiant heating is performed, the operation frequency of the compressor is set lower than when both hot air heating and radiant heating are performed.

Japanese Unexamined Patent Publication No. Sho 63-113239

However, when performing radiant heating without performing hot air heating, if the operating frequency of the compressor is lowered, the capability of radiant heating may be insufficient and sufficient heating may not be performed. Also, when the operating frequency of the compressor is increased to increase the capacity of radiant heating, the indoor fan is stopped, so the amount of refrigerant heat exchange in the heat exchanger is small, and the pressure in the refrigerant circuit is high. turn into. Therefore, there arises a problem that the operation of the air conditioner stops due to a high pressure abnormality.
Also, if both hot air heating and radiant heating are performed, the operating frequency of the compressor can be raised, and these problems can be solved, but normal hot air heating gives a draft feeling, so heating without a draft feeling Couldn't answer user's request for

  Then, the objective of this invention is providing the air conditioner which can improve a heating capability, without almost feeling a draft feeling.

  An air conditioner according to a first aspect of the present invention is an air conditioner including an indoor unit and an outdoor unit connected to the indoor unit via a refrigerant circuit, and the indoor unit constitutes the refrigerant circuit. A heat exchanger and a radiant panel each having a part of the piping to be heated, and a fan disposed in the vicinity of the heat exchanger, flowing a refrigerant through the heat exchanger to perform hot air heating, and During the radiant heating operation, the radiant heating operation is performed by flowing a refrigerant through the radiant panel to perform radiant heating, the hot air is heated by flowing the refrigerant through the heat exchanger, and the radiant heating is performed by flowing the refrigerant through the radiant panel. Further, it is possible to perform a radiant light breeze heating operation in which a radiant breeze heating with a reduced air volume generated by the fan is possible.

  In this air conditioner, the amount of air generated by the fan is reduced during the radiant light air heating operation, so that it is possible to perform hot air heating that makes the user feel almost no draft. Moreover, since the amount of heat exchange by the heat exchanger is large because the fan is not stopped, the pressure in the refrigerant circuit can be prevented from becoming too high. Therefore, the rotation speed of the compressor of the outdoor unit can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the fan stopped.

  An air conditioner according to a second invention is the air conditioner according to the first invention, based on an indoor temperature sensor that detects a temperature of a room in which the indoor unit is installed, and an indoor temperature detected by the indoor temperature sensor, Switching means for switching between the radiant heating operation and the radiant light breeze heating operation is provided.

  In this air conditioner, it is possible to switch between the radiant heating operation and the radiant light wind heating according to the room temperature so that the radiant heating operation is performed when the room temperature is low and the radiant light wind heating operation is performed when the room temperature is high. it can. As a result, when the room temperature is low, the room temperature can be quickly raised, and when the room temperature becomes high, it is possible to automatically switch to heating with almost no draft feeling.

  An air conditioner according to a third invention relates to the compressor provided in the outdoor unit, the control means for controlling the compressor, and the pressure in the heat exchanger in the first or second invention. Storage means storing an upper limit value, and when at least one of the radiant heating operation and the radiant breeze heating operation is performed, the control means is configured to set the pressure in the heat exchanger to the upper limit value. The compressor is controlled so as to substantially match the corresponding pressure.

  In this air conditioner, the heating capacity can be improved because the compressor is controlled so that the pressure in the refrigerant circuit substantially coincides with the upper limit pressure during the radiant heating operation or the radiant wind heating operation.

  An air conditioner according to a fourth invention is the air conditioner according to the third invention, further comprising a heat exchange temperature sensor provided in the heat exchanger, wherein the storage means is the upper limit value for the pressure in the heat exchanger. The upper limit temperature of the heat exchange temperature in the heat exchanger is stored, and when at least one of the radiant heating operation and the radiant light breeze heating operation is performed, the control means is the heat exchange temperature sensor. The compressor is controlled so that the detected heat exchange temperature substantially coincides with the upper limit temperature.

  In this air conditioner, the pressure in the refrigerant circuit is controlled to substantially match the upper limit pressure by controlling the compressor so that the heat exchange temperature detected by the heat exchange temperature sensor substantially matches the upper limit temperature. be able to.

  An air conditioner according to a fifth aspect of the present invention is an air conditioner including an indoor unit and an outdoor unit connected to the indoor unit via a refrigerant circuit, and the indoor unit constitutes the refrigerant circuit. A heat exchanger and a radiant panel each having a part of a pipe to be circulated, and a fan disposed in the vicinity of the heat exchanger, and the refrigerant is supplied to the heat exchanger without flowing the refrigerant through the radiant panel. And hot air heating operation for flowing hot air and flowing a refrigerant to the heat exchanger to perform hot air heating and flowing a refrigerant to the radiation panel to perform radiant heating, and from the time of the hot air heating operation It is possible to perform a radiant light breeze heating operation in which a radiant light breeze heating with a reduced air volume generated by a fan is possible.

  In this air conditioner, the amount of air generated by the fan is reduced during the radiant light air heating operation, so that it is possible to perform hot air heating that makes the user feel almost no draft. Moreover, since the amount of heat exchange by the heat exchanger is large because the fan is not stopped, the pressure in the refrigerant circuit can be prevented from becoming too high. Therefore, the rotation speed of the compressor of the outdoor unit can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the fan stopped.

  The air conditioner according to a sixth aspect of the present invention is the air conditioner according to the fifth aspect, wherein an upper limit value for the pressure in the compressor provided in the outdoor unit, the control means for controlling the compressor, and the pressure in the heat exchanger is Stored in the storage means, and when the radiant breeze heating operation is performed, the control means compresses the pressure so that the pressure in the heat exchanger substantially matches the pressure corresponding to the upper limit value. It is characterized by controlling the machine.

  In this air conditioner, during the radiant light wind heating operation, the compressor is controlled so that the pressure in the refrigerant circuit substantially matches the upper limit pressure, so that the heating capacity can be improved.

  An air conditioner according to a seventh aspect of the present invention is the air conditioner according to the sixth aspect, further comprising a heat exchange temperature sensor provided in the heat exchanger, wherein the storage means is the upper limit value for the pressure in the heat exchanger. The upper limit temperature of the heat exchange temperature in the heat exchanger is stored, and when the radiant breeze heating operation is performed, the control means detects the heat exchange temperature detected by the heat exchange temperature sensor. The compressor is controlled so as to substantially coincide with an upper limit temperature.

  In this air conditioner, the pressure in the refrigerant circuit is controlled to substantially match the upper limit pressure by controlling the compressor so that the heat exchange temperature detected by the heat exchange temperature sensor substantially matches the upper limit temperature. be able to.

  An air conditioner according to an eighth aspect of the present invention is the air conditioner according to any one of the first to seventh aspects, further comprising a valve mechanism that adjusts an amount of refrigerant supplied to the radiation panel, wherein the radiation circuit includes: The valve mechanism and the heat exchanger are provided in parallel.

  In this air conditioner, since the radiation panel and the valve mechanism are provided in parallel with the heat exchanger, only the warm air heating operation without flowing the refrigerant to the radiation panel and the radiation heating operation for flowing the refrigerant to the radiation panel are performed. Alternatively, the operation can be switched between the radiant breeze heating operation only by opening and closing the valve mechanism.

  As described above, according to the present invention, the following effects can be obtained.

  In the first and fifth aspects of the invention, since the air volume generated by the fan is reduced during the radiant light air heating operation, it is possible to perform hot air heating that hardly causes the user to feel a draft. Moreover, since the amount of heat exchange by the heat exchanger is large because the fan is not stopped, the pressure in the refrigerant circuit can be prevented from becoming too high. Therefore, the rotation speed of the compressor of the outdoor unit can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the fan stopped.

  According to the second aspect of the invention, the radiant heating operation and the radiant breeze heating can be switched according to the room temperature so that the radiant heating operation is performed when the room temperature is low and the radiant breeze heating operation is performed when the room temperature is high. it can. As a result, when the room temperature is low, the room temperature can be quickly raised, and when the room temperature becomes high, it is possible to automatically switch to heating with almost no draft feeling.

  In the third and sixth inventions, the heating capacity can be improved because the compressor is controlled so that the pressure in the refrigerant circuit substantially coincides with the upper limit pressure during the radiant heating operation or during the radiant breeze heating operation. .

  In the fourth and seventh inventions, by controlling the compressor so that the heat exchange temperature detected by the heat exchange temperature sensor substantially matches the upper limit temperature, the pressure in the refrigerant circuit almost matches the upper limit pressure. Can be controlled.

  In the eighth invention, since the radiant panel and the valve mechanism are provided in parallel with the heat exchanger, an operation in which only the hot air heating is performed without flowing the refrigerant through the radiant panel, and a radiant heating operation in which the refrigerant flows through the radiant panel are performed. Alternatively, the operation can be switched between the radiant breeze heating operation only by opening and closing the valve mechanism.

It is a circuit diagram showing the schematic structure of the air conditioner concerning the embodiment of the present invention, and is a figure showing the flow of the refrigerant at the time of cooling operation and hot air heating operation. It is a circuit diagram which shows schematic structure of the air conditioner which concerns on embodiment of this invention, Comprising: It is a figure which shows the flow of the refrigerant | coolant at the time of a radiation heating operation and a radiation breeze heating operation. It is a block diagram which shows schematic structure of the control part which controls an air conditioner. It is a graph which shows operation | movement of each part of an air conditioner at the time of a radiation 1 operation mode driving | operation, room temperature, and a radiation panel temperature. It is a graph which shows operation | movement of each part of an air conditioner at the time of a radiation 2 operation mode driving | operation, room temperature, and a radiation panel temperature.

  Hereinafter, an embodiment of an air conditioner 1 according to the present invention will be described.

<Overall configuration of the air conditioner 1>
As shown in FIGS. 1 and 2, the air conditioner 1 of this embodiment includes an indoor unit 2 installed indoors, an outdoor unit 3 installed outdoor, and a remote controller 4 (see FIG. 3). ing. The indoor unit 2 detects an indoor heat exchanger 20, an indoor fan 21 disposed in the vicinity of the indoor heat exchanger 20, a radiation panel 22, an indoor electric valve (valve mechanism) 23, and an indoor air temperature. The indoor temperature sensor 24 is provided. The outdoor unit 3 includes a compressor 30, a four-way switching valve 31, an outdoor heat exchanger 32, an outdoor fan 33 disposed in the vicinity of the outdoor heat exchanger 32, and an outdoor electric valve 34. Yes.

In the air conditioner 1, the indoor heat exchanger 20, the compressor 30, the four-way switching valve 31, the outdoor heat exchanger 32, and the outdoor electric valve 34 are connected to form an annular refrigerant circuit 10. In the refrigerant circuit 10, the pipes on both sides of the indoor heat exchanger 20 are connected by the bypass pipe 11.
The bypass pipe 11 is provided with a radiation panel 22 and an indoor motor operated valve 23. A panel entry temperature sensor 25 and a panel exit temperature sensor 26 are attached to both sides of the radiation panel 22 in the bypass pipe 11. Further, an accumulator 35 is interposed between the suction side of the compressor 30 and the four-way switching valve 31 in the refrigerant circuit 10, and the discharge side of the compressor 30 and the four-way switching valve 31 in the refrigerant circuit 10 are interposed. A discharge temperature sensor 36 is attached between them. An outdoor heat exchanger temperature sensor 28 is attached to the outdoor heat exchanger 32.

  The indoor heat exchanger 20 has a pipe that constitutes a part of the refrigerant circuit, and an indoor heat exchanger temperature sensor 27 is attached thereto. The indoor heat exchanger 20 is disposed on the windward side of the indoor fan 21. The air heated or cooled by heat exchange with the indoor heat exchanger 20 is blown into the room as warm air or cold air by the indoor fan 21, whereby hot air heating or cooling is performed.

  The radiation panel 22 is arrange | positioned at the surface side of the indoor unit 2, and has piping which comprises a part of refrigerant circuit. Radiant heating is performed by radiating the heat of the refrigerant flowing through the pipe into the room. The indoor motor operated valve 23 is provided to adjust the flow rate of the refrigerant supplied to the radiation panel 22.

  The air conditioner 1 of the present embodiment can perform a cooling operation, a warm air heating operation, a radiant heating operation, and a radiant light wind heating operation. The cooling operation is an operation in which the refrigerant is allowed to flow through the indoor heat exchanger 20 without flowing the refrigerant through the radiant panel 22, and the hot air heating operation is the indoor heat exchanger without flowing the refrigerant through the radiant panel 22. 20 is an operation in which a refrigerant is passed through to perform hot air heating. The radiant heating operation is an operation in which the refrigerant is passed through the indoor heat exchanger 20 to perform hot air heating, and the refrigerant is passed through the radiant panel 22 to perform radiant heating. The radiant breeze heating operation is an operation in which the warm air heating is performed with a lower air volume than in the warm air heating operation and the radiant heating operation, and the refrigerant is passed through the radiant panel 22 to perform the radiant heating.

The flow of the refrigerant in the refrigerant circuit during each operation will be described with reference to FIGS. 1 and 2.
During the cooling operation, the indoor electric valve 23 is closed, and the four-way switching valve 31 is switched to the state indicated by the broken line in FIG. Therefore, as indicated by the dashed arrows in FIG. 1, the high-temperature and high-pressure refrigerant discharged from the compressor 30 flows into the outdoor heat exchanger 32 through the four-way switching valve 31. The refrigerant condensed in the outdoor heat exchanger 32 is decompressed by the outdoor motor operated valve 34 and then flows into the indoor heat exchanger 20. Then, the refrigerant evaporated in the indoor heat exchanger 20 flows into the compressor 30 via the four-way switching valve 31 and the accumulator 35.

  During the hot air heating operation, the indoor motor operated valve 23 is closed and the four-way switching valve 31 is switched to the state shown by the solid line in FIG. Therefore, as indicated by the solid arrow in FIG. 1, the high-temperature and high-pressure refrigerant discharged from the compressor 30 flows into the indoor heat exchanger 20 through the four-way switching valve 31. The refrigerant condensed in the indoor heat exchanger 20 is decompressed by the outdoor motor operated valve 34 and then flows into the outdoor heat exchanger 32. The refrigerant evaporated in the outdoor heat exchanger 32 flows into the compressor 30 via the four-way switching valve 31 and the accumulator 35.

  During the radiant heating operation and the radiant breeze heating operation, the indoor motor-operated valve 23 is opened, and the four-way switching valve 31 is switched to the state indicated by the solid line in FIG. Therefore, as indicated by the solid arrows in FIG. 2, the high-temperature and high-pressure refrigerant discharged from the compressor 30 flows into the indoor heat exchanger 20 and the radiation panel 22 through the four-way switching valve 31. Then, the refrigerant condensed in the indoor heat exchanger 20 and the radiation panel 22 is decompressed by the outdoor motor operated valve 34 and then flows into the outdoor heat exchanger 32. The refrigerant evaporated in the outdoor heat exchanger 32 flows into the compressor 30 via the four-way switching valve 31 and the accumulator 35.

<Remote control 4>
In the remote controller 4, the user performs operation start / stop operation, operation mode setting, indoor temperature target temperature setting (indoor set temperature), blowing air volume setting, and the like. As shown in Table 1, in the air conditioner 1 of the present embodiment, either the cooling operation mode or the heating operation mode can be selected as the main operation mode by operating the remote controller 4.

  When the heating operation mode is selected as the main operation mode, as shown in Table 1, one of the warm air heating operation mode and the radiation 1 operation mode and the radiation 2 operation mode included in the radiant heating operation mode can be selected. It is like that.

  As shown in Table 1, the cooling operation mode is a mode for performing cooling operation, the warm air heating operation mode is a mode for performing warm air heating operation, and the radiation 1 operation mode is determined according to the room temperature. A mode for switching between a radiant heating operation and a radiant breeze heating operation, and the radiant 2 operation mode is a mode for performing a radiant breeze heating operation. In addition, when the hot air heating operation mode or the cooling operation mode is selected, any of “air volume automatic”, “strong”, and “weak” can be selected as the air volume setting. In the present embodiment, the air volume is automatically controlled when the radiation 1 operation mode or the radiation 2 operation mode is selected.

<Control unit 5>
Next, the control part 5 which controls the air conditioner 1 is demonstrated, referring FIG.
As shown in FIG. 3, the control unit 5 includes a storage unit (storage unit) 50, an operation mode control unit (switching unit) 51, an indoor motorized valve control unit 52, an indoor fan control unit 53, and a compressor control. Unit (control means) 54 and outdoor electric valve control unit 55.

(Storage unit 50)
The storage unit 50 stores various operation settings related to the air conditioner 1, control programs, data tables necessary for executing the control programs, and the like. The operation settings include those set by operating the remote controller 4 by the user, such as a target temperature of the room temperature (room set temperature), and those set in advance for the air conditioner 1. . In the air conditioner 1 of this embodiment, the target temperature range of the radiation panel 22 is set in advance to a predetermined temperature range (for example, 50 to 55 ° C.). Note that the target temperature range of the radiation panel 22 may be set by operating the remote controller 4. The storage unit 50 stores the upper limit temperature of the heat exchange temperature in the indoor heat exchanger 20 corresponding to the upper limit pressure in the indoor heat exchanger 20.

(Operation mode control unit 51)
The operation mode control unit 51 starts the cooling operation, the heating operation, or the radiant light wind heating operation when the operation of starting the cooling operation mode, the warm air heating operation mode, or the radiation 2 operation mode is performed by the remote controller 4. .
In addition, when the operation of starting the radiation 1 operation mode is performed by the remote controller 4, the operation mode control unit 51 starts the radiant heating operation when the indoor temperature detected by the indoor temperature sensor 24 is lower than the indoor set temperature. In addition, when the room temperature is equal to or higher than the indoor set temperature, the radiant light wind heating operation is started.
In the air conditioner 1 of the present embodiment, when the operation is started by operating the remote controller 4, the heating operation is not started when the room temperature is higher than the indoor set temperature by a predetermined temperature Tb or more.

Further, the operation mode control unit 51 radiates from the radiant heating operation when the room temperature detected by the room temperature sensor 24 becomes equal to or higher than the indoor set temperature during the radiant heating operation during the radiant one operation mode operation. In addition to switching to the breeze heating operation, when the room temperature becomes lower than the indoor set temperature by a predetermined temperature Ta or more during the radiant breeze heating operation, the radiant breeze heating operation is switched to the radiant heating operation.
Further, the operation mode control unit 51 automatically stops the operation (thermo-off) when the room temperature becomes higher than the indoor set temperature by a predetermined temperature Tb or more during the heating operation, and then the room temperature. When the temperature drops to the indoor set temperature, the operation is started again (thermo-on).

(Indoor motorized valve controller 52)
The indoor motorized valve control unit 52 controls the opening degree of the indoor motorized valve 23. As shown in Table 2, the indoor motor-operated valve control unit 52 closes the indoor motor-operated valve 23 during the cooling operation or the hot air heating operation. Table 2 shows control states of the indoor motor operated valve 23, the indoor fan 21, and the compressor 30 during each operation.

  As shown in Table 2, the indoor motor-operated valve control unit 52 controls the opening degree of the indoor motor-operated valve 23 based on the temperature of the radiation panel 22 during the radiation heating operation or the radiation breeze heating operation. Specifically, the surface temperature (predicted value) of the radiation panel 22 is calculated based on the average value of the temperatures detected by the panel entry temperature sensor 25 and the panel exit temperature sensor 26, and the surface temperature of the radiation panel 22 is calculated. Of the indoor motor-operated valve 23 is controlled so that the predicted value (hereinafter, simply referred to as a radiant panel temperature) falls within a panel target temperature range (eg, 50 to 55 ° C.). As the radiant panel temperature is lower than the panel target temperature range, the indoor motor-operated valve control unit 52 controls the opening of the indoor motor-operated valve 23 so that the flow rate of the refrigerant supplied to the radiant panel 22 increases. However, the indoor motor-operated valve control unit 52 controls the indoor motor-operated valve 23 to the initial opening until the predetermined time t1 has elapsed from the start of the operation (when the operation is started by operating the remote controller 4 or when the operation is started by thermo-on). . In this embodiment, in order to calculate the radiation panel temperature, both the detected temperature of the panel input temperature sensor 25 and the panel output temperature sensor 26 are used, but only the detected temperature of the panel input temperature sensor 25 is used. Alternatively, only the temperature detected by the panel temperature sensor 26 may be used.

(Indoor fan control unit 53)
The indoor fan control unit 53 controls the rotational speed of the indoor fan 21. Table 3 shows the fan taps selected during the automatic air volume operation, the radiant heating operation, and the radiant light air heating operation of the hot air heating operation, and the rotation speeds corresponding to the fan taps.

  During the air volume automatic operation of the hot air heating operation, the indoor fan control unit 53 selects one of the five stages of fan taps A1 to A5 shown in Table 3 based on the indoor temperature or the indoor set temperature detected by the indoor temperature sensor 24. And the indoor fan 21 is controlled to the number of rotations (a1 to a5) corresponding to the fan tap. Further, in the warm air heating operation, when “strong” or “weak” is set as the air volume setting, a preset fan tap is determined respectively.

  In addition, during the air volume automatic operation during the cooling operation, the indoor fan control unit 53 selects one of a plurality of preset fan taps based on the indoor temperature, the indoor set temperature, or the like detected by the indoor temperature sensor 24. And the indoor fan 21 is controlled to the rotation speed corresponding to this fan tap. Further, in the cooling operation, when “strong” or “weak” is set as the air volume setting, a preset fan tap is determined respectively.

  In addition, during the radiant heating operation, the indoor fan control unit 53 selects one of the seven stages of fan taps B1 to B7 shown in Table 3 based on the indoor temperature or the indoor set temperature detected by the indoor temperature sensor 24. And the indoor fan 21 is controlled to the rotation speed (b1-b7) corresponding to this fan tap.

  Moreover, at the time of a radiation breeze heating operation, the indoor fan control part 53 controls the indoor fan 21 to the rotation speed c1 corresponding to the fan tap C1 shown in Table 3. The rotation speed c1 is smaller than any of the rotation speeds a1 to a5 during the hot air heating operation and the rotation speeds b1 to b7 during the radiant heating operation. The rotation speed c1 is a value at which almost no sound is generated due to the rotation of the indoor fan 21 and the draft feeling is hardly felt.

(Compressor control unit 54)
The compressor control unit 54 controls the operating frequency of the compressor 30.
During the hot air heating operation and the cooling operation, the frequency of the compressor 30 is controlled based on the room temperature, the indoor set temperature, and the like. Specifically, the compressor control unit 54 controls the compressor 30 such that the frequency of the compressor 30 increases as the difference between the indoor temperature and the indoor set temperature increases.

  Further, at the time of the radiant heating operation and the radiant breeze heating operation, the compressor control unit 54 causes the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 to substantially coincide with the upper limit temperature corresponding to the upper limit pressure in the refrigerant circuit. The compressor 30 is controlled as described above (this control is referred to as upper limit control). Specifically, the frequency of the compressor 30 is controlled by the control based on the indoor temperature and the indoor set temperature so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 exceeds the upper limit temperature. Also, the heat exchange temperature is controlled so as to become a value near the upper limit temperature without exceeding the upper limit temperature.

(Outdoor motorized valve controller 55)
The outdoor electric valve control unit 55 controls the opening degree of the outdoor electric valve 34 based on the indoor temperature, the indoor set temperature, and the like.

<Operation of the air conditioner 1>
Next, operation | movement of each heating operation mode of the air conditioner 1 is demonstrated. The radiation 1 operation mode and the radiation 2 operation mode will be described with reference to the graphs of FIGS. 4 and 5. 4 and 5, the horizontal axis indicates time, and the vertical axis indicates the indoor temperature, the rotational speed of the indoor fan 21, the operating frequency of the compressor 30, the radiation panel temperature, and the opening degree of the indoor motor operated valve 23. Each is shown.

(Hot air heating operation mode operation)
When the operation of starting the warm air heating operation mode is performed by the remote controller 4 and “automatic air volume” is selected as the air volume setting, the indoor fan control unit 53 causes the indoor fan 21 to be fan-tapped according to the indoor temperature. The rotational speed is controlled to correspond to any one of A1 to A5. Further, the compressor control unit 54 controls the compressor 30 such that the operating frequency increases as the difference between the room temperature and the room set temperature increases. Moreover, the indoor motor operated valve 23 is closed.

  In addition, when the operation of starting the warm air heating operation mode is performed by the remote controller 4 and “strong” or “weak” is selected as the air volume setting, the indoor motor-operated valve 23 and the compressor 30 are set to “automatic air volume”. The indoor fan 21 is controlled by the indoor fan control unit 53 to a rotational speed corresponding to a predetermined fan tap.

(Radiation 1 operation mode operation)
As shown in FIG. 4, when the operation of starting the radiation 1 operation mode is performed by the remote controller 4, the radiation heating operation is started when the indoor temperature at the start of the operation is lower than the indoor set temperature. In this case, the indoor fan control unit 53 controls the indoor fan 21 to a rotational speed corresponding to any one of the fan taps B1 to B7 according to the indoor temperature and the indoor set temperature. Further, the compressor control unit 54 controls the compressor 30 so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 substantially coincides with the upper limit temperature (upper limit control is performed). Further, the indoor motor-operated valve control unit 52 controls the indoor motor-operated valve 23 to the initial opening until a predetermined time t1 has elapsed from the start of operation, and when the predetermined time t1 has elapsed from the start of operation, the radiant panel temperature changes to the panel. The opening degree is controlled to be within the target temperature range. In FIG. 4, the initial opening degree of the indoor motor operated valve 23 is smaller than the fully open position, but the initial opening degree may be fully opened.

  When the room temperature reaches the indoor set temperature during the radiant heating operation, the radiant heating operation is switched to the radiant light breeze heating operation. Thereby, the indoor fan control part 53 controls the indoor fan 21 to the rotation speed c1 corresponding to the fan tap C1. The indoor motor-operated valve control unit 52 and the compressor control unit 54 control the indoor motor-operated valve 23 and the compressor 30 in the same manner as before switching to the radiant light wind heating.

  When the indoor temperature further rises and the indoor set temperature becomes higher than the indoor set temperature by a predetermined temperature Tb or more, the operation is automatically stopped (thermo-off). Thereby, the indoor fan 21 and the compressor 30 are stopped, and the indoor motor-operated valve 23 is switched to the fully closed state. Thereafter, when the room temperature decreases to the indoor set temperature, the operation is started again (thermo-on). In FIG. 4, since the indoor temperature when the thermo is on is equal to or higher than the indoor set temperature, the radiant breeze heating operation is started, and the indoor motor-operated valve 23, the indoor fan 21, and the compressor 30 are controlled as before the thermo-off.

  When the indoor temperature becomes lower than the indoor set temperature by a predetermined temperature Ta or more during the radiant light wind heating operation, the radiant light wind heating operation is switched to the radiant heating operation. The fan 21 and the compressor 30 are controlled.

(Radiation 2 operation mode operation)
As shown in FIG. 5, when the operation of starting the radiation 2 operation mode is performed by the remote controller 4, the radiation breeze heating operation is started. The indoor fan control unit 53 controls the indoor fan 21 to the rotational speed c1 corresponding to the fan tap C1. Further, the compressor control unit 54 controls the compressor 30 so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 substantially coincides with the upper limit temperature (upper limit control is performed). Further, the indoor motor-operated valve control unit 52 controls the indoor motor-operated valve 23 to the initial opening until a predetermined time t1 has elapsed from the start of operation, and when the predetermined time t1 has elapsed from the start of operation, the radiant panel temperature changes to the panel. The opening degree is controlled to be within the target temperature range.

(Defrost operation)
Moreover, in the air conditioner 1, in order to remove the frost adhering to the outdoor heat exchanger 32 at the time of heating operation mode operation | movement, the four-way switching valve 31 is switched to the state shown with the broken line in FIG.1 and FIG.2, and heating operation is carried out. To defrost operation (defrost operation). In the air conditioner 1 of this embodiment, when performing a defrost operation, the indoor motor operated valve 23 is closed. Thereby, since a low-temperature refrigerant | coolant does not flow into the radiation panel 22, the temperature fall of the radiation panel 22 can be suppressed. Therefore, when the heating operation is started again, the temperature of the radiation panel 22 can be quickly brought within the panel target temperature range.

  In addition, control of the indoor motor operated valve 23 during the defrosting operation is not limited to this, and the indoor motor operated valve 23 is maintained at a predetermined opening degree until the radiation panel temperature reaches a predetermined temperature. When the temperature falls to the predetermined temperature, the indoor motor-operated valve 23 may be switched to a closed state. In this case, since a low-temperature refrigerant flows through the radiation panel 22, the temperature of the radiation panel 22 decreases to some extent, but the high-temperature refrigerant in the radiation panel 22 can be used for defrosting the outdoor heat exchanger 32. The frost adhering to the outdoor heat exchanger 32 can be removed more quickly than in the case described above. Moreover, it can prevent that frost adheres to the radiation panel 22 during a defrost operation.

<Characteristics of air conditioner 1>
According to the air conditioner 1 of the present embodiment described above, the amount of air generated by the indoor fan 21 is reduced during the radiant light air heating operation, so that it is possible to perform hot air heating that makes the user feel almost no draft. It is. Moreover, since the amount of heat exchange by the indoor heat exchanger 20 is large because the indoor fan 21 is not stopped, it is possible to prevent the pressure in the refrigerant circuit from becoming too high. Therefore, the rotation speed of the compressor 30 of the outdoor unit 3 can be increased and the heating capacity can be improved as compared with the case where only the radiant heating is performed with the indoor fan 21 stopped.

  In the air conditioner 1 according to the present embodiment, the radiant heating operation and the radiant breeze heating are performed according to the room temperature so that the radiant heating operation is performed when the room temperature is low and the radiant breeze heating operation is performed when the room temperature is high. Is switched. As a result, when the room temperature is low, the room temperature can be quickly raised, and when the room temperature becomes high, it is possible to automatically switch to heating with almost no draft feeling.

  In the present embodiment, at the start of the radiation 1 operation mode operation, when the room temperature is lower than the indoor set temperature, the radiation heating operation is performed, and when the room temperature is equal to or higher than the indoor set temperature, the operation is switched to the radiation breeze heating operation. . Therefore, the room temperature can be quickly raised to the room set temperature.

  Moreover, in this embodiment, when the room temperature is lower than the indoor set temperature by a predetermined temperature Ta or more during the radiant breeze heating operation in the radiant 1 operation mode, the radiant breeze heating operation is switched to the radiant heating operation. Thereby, when the room temperature is lower than the indoor set temperature, the switching of the operation can be reduced and the radiant breeze heating operation can be continued rather than switching from the radiant breeze heating operation to the radiant heating operation.

  In the air conditioner 1 of the present embodiment, the compressor 30 is controlled so that the pressure in the refrigerant circuit substantially coincides with the upper limit pressure during the radiant heating operation or the radiant breeze heating operation, so that the heating capacity is improved. Can do. In the present embodiment, the pressure in the refrigerant circuit substantially matches the upper limit pressure by controlling the compressor 30 so that the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 substantially matches the upper limit temperature. Can be controlled.

  In the air conditioner 1 of the present embodiment, the radiant panel 22 and the indoor motor-operated valve 23 are provided in parallel with the indoor heat exchanger 20, so that hot air that performs only hot air heating without flowing refrigerant through the radiant panel 22. It is possible to switch between the heating operation and the radiant heating operation in which the refrigerant flows through the radiant panel 22 or the radiant breeze heating operation simply by opening and closing the indoor motor-operated valve 23.

  Moreover, in the air conditioner 1 of this embodiment, the number of fan taps (B1-B7) at the time of radiant heating operation is larger than the number of fan taps (A1-A5) at the time of warm air heating operation. That is, during the radiant heating operation, the rotational speed of the indoor fan 21 changes more finely than during the hot air heating operation. By finely changing the rotation speed of the indoor fan 21 during the radiant heating operation, it is possible to reduce the sound accompanying the rotation of the indoor fan 21 when switching from the radiant heating operation to the radiant light wind heating operation.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the above embodiment, when the room temperature is lower than the indoor set temperature by a predetermined temperature Tb or more during the radiant light breeze heating operation in the radiation 1 operation mode, the radiant breeze heating operation is switched to the radiant heating operation. When the temperature is lower than the indoor set temperature, the radiant breeze heating operation may be switched to the radiant heating operation.

  In the said embodiment, although the rotation speed of the indoor fan 21 at the time of radiation breeze heating operation is maintained by the rotation speed c1 set beforehand, if it is rotation speed smaller than the rotation speed of the indoor fan 21 at the time of radiation heating operation , May vary.

In the above embodiment, the heating operation includes a warm air heating operation, a radiant heating operation, and a radiant light wind heating operation, and the indoor air volume during the radiant light wind heating operation is the same as that during the warm air heating operation and during the radiant heating operation. Although the case where it is smaller than the indoor air volume has been described, the present invention is not limited to this.
Therefore, the heating operation includes a radiant heating operation and a radiant breeze heating operation, and the indoor air volume during the radiant breeze heating operation may be smaller than the indoor air volume during the radiant heating operation. In the above embodiment, as the operation mode, not only the radiation 1 operation mode and the radiation 2 heating operation mode but also other operation modes can be selected. In this case, the other operation modes may not be selected. Therefore, for example, a cooling operation mode or a warm air heating operation mode may not be selected as the operation mode.

  Further, as the heating operation, there is a warm air heating operation and a radiant light wind heating operation, and the indoor air volume during the radiant light wind heating operation may be smaller than the indoor air volume during the hot air heating operation. In the above embodiment, not only the warm air heating operation mode and the radiation 2 operation mode but also other operation modes can be selected as the operation mode, but in this case, other operation modes may not be selected. Therefore, for example, the cooling operation mode or the radiation 1 operation mode may not be selected as the operation mode.

  If the present invention is used, the heating capacity can be improved with almost no draft feeling.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 3 Outdoor unit 4 Remote control 20 Indoor heat exchanger (heat exchanger)
21 Indoor fans (fans)
22 Radiation panel 23 Indoor motorized valve (valve mechanism)
24 indoor temperature sensor 27 indoor heat exchange temperature sensor (heat exchange temperature sensor)
30 Compressor 50 Storage section (storage means)
51 Operation mode controller (switching means)
52 Indoor Electric Valve Control Unit 53 Indoor Fan Control Unit 54 Compressor Control Unit (Control Unit)

Claims (8)

An air conditioner comprising an indoor unit and an outdoor unit connected to the indoor unit via a refrigerant circuit,
The indoor unit includes a heat exchanger and a radiation panel each having a part of a pipe constituting the refrigerant circuit, and a fan disposed in the vicinity of the heat exchanger,
A radiant heating operation in which a refrigerant is flowed to the heat exchanger to perform hot air heating and a radiant heating is performed by flowing a refrigerant to the radiant panel;
Radiant heating is performed by flowing a refrigerant through the heat exchanger, and heating is performed by flowing a refrigerant through the radiant panel, and radiant heating is performed by reducing the amount of air generated by the fan during the radiant heating operation. An air conditioner characterized by being capable of light wind heating operation. An indoor temperature sensor for detecting the temperature of the room in which the indoor unit is installed;
The air conditioner according to claim 1, further comprising switching means for switching between the radiation heating operation and the radiation breeze heating operation based on an indoor temperature detected by the indoor temperature sensor. A compressor provided in the outdoor unit;
Control means for controlling the compressor;
Storage means storing an upper limit value for the pressure in the heat exchanger,
When at least one of the radiation heating operation and the radiation breeze heating operation is performed,
The air conditioner according to claim 1 or 2, wherein the control unit controls the compressor so that a pressure in the heat exchanger substantially coincides with a pressure corresponding to the upper limit value. A heat exchanger temperature sensor provided in the heat exchanger;
The storage means stores the upper limit temperature of the heat exchange temperature in the heat exchanger as the upper limit value for the pressure in the heat exchanger,
When at least one of the radiation heating operation and the radiation breeze heating operation is performed,
The air conditioner according to claim 3, wherein the control unit controls the compressor so that a heat exchange temperature detected by the heat exchange temperature sensor substantially matches the upper limit temperature. An air conditioner comprising an indoor unit and an outdoor unit connected to the indoor unit via a refrigerant circuit,
The indoor unit includes a heat exchanger and a radiation panel each having a part of a pipe constituting the refrigerant circuit, and a fan disposed in the vicinity of the heat exchanger,
Hot air heating operation in which hot air heating is performed by flowing refrigerant through the heat exchanger without flowing refrigerant through the radiation panel;
The refrigerant is supplied to the heat exchanger to perform hot air heating, and the refrigerant is supplied to the radiant panel to perform radiant heating, and the air flow generated by the fan is smaller than that during the hot air heating operation. An air conditioner characterized in that it can be operated with radiant light wind heating. A compressor provided in the outdoor unit;
Control means for controlling the compressor;
Storage means storing an upper limit value for the pressure in the heat exchanger,
When the radiation breeze heating operation is performed,
The air conditioner according to claim 5, wherein the control unit controls the compressor so that a pressure in the heat exchanger substantially coincides with a pressure corresponding to the upper limit value. A heat exchanger temperature sensor provided in the heat exchanger;
The storage means stores the upper limit temperature of the heat exchange temperature in the heat exchanger as the upper limit value for the pressure in the heat exchanger,
When the radiation breeze heating operation is performed,
The air conditioner according to claim 6, wherein the control unit controls the compressor so that a heat exchange temperature detected by the heat exchange temperature sensor substantially coincides with the upper limit temperature. A valve mechanism for adjusting the amount of refrigerant supplied to the radiation panel;
The air conditioner according to any one of claims 1 to 7, wherein in the refrigerant circuit, the radiation panel, the valve mechanism, and the heat exchanger are provided in parallel.

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