JP6979361B2 - Bathroom heater - Google Patents

Description

The present invention relates to a bathroom heater that is connected to a high-temperature heat source machine and a low-temperature heat source machine and is circulated and supplied with heat media having different temperatures.

Conventionally, there is known a bathroom heater which is connected to a heating unit for heating a heat medium having a gas heat source machine and heats the bathroom by circulating and supplying the heat medium from the heating unit. This type of bathroom heater comprises a heat exchanger that exchanges heat between the heat medium circulated and supplied from the heating unit and the air in the bathroom, and a circulation fan that circulates the air in the bathroom. The gas heat source machine has a high heating capacity capable of heating a heat medium to a high temperature, but has a problem of high energy consumption.

A gas heat source machine, which is a high-temperature heat source machine, is used together with a low-temperature heat source machine with a low heating capacity that can heat a heat medium such as a heat pump to a low temperature, and a heat medium heated by either heat source machine is selected for the bathroom heater. It has also been proposed to supply the heat in a circulating manner (for example, Patent Document 1). If it is a bathroom heater connected to such a heat source machine having a different heating capacity, it is possible to switch the heat source machine for heating the heat medium according to the usage situation. Therefore, the bathroom can be heated while suppressing the energy consumption.

JP-A-2017-180987

By the way, in order to raise the temperature in the bathroom at an early stage at the beginning of the heating operation, it is preferable to set the rotation speed of the circulation fan high and increase the air volume of the air circulating in the bathroom, while increasing the air volume from the bathroom to the bathroom. The temperature of the heat exchanger drops in a short time due to the low temperature air sent to the heater. In the case of a high-temperature heat source machine such as a gas heat source machine, even if the temperature of the heat medium drops significantly due to heat exchange in the heat exchanger, the temperature of the heat medium can be sufficiently raised by reheating in the high-temperature heat source machine. However, low-temperature heat source machines such as heat pumps have a low heating capacity and the temperature of the heat medium does not easily rise, so the user in the bathroom feels a great deal of cold air.

From the above viewpoint, in the initial stage of heating operation, when the temperature of the heat medium becomes higher than the starting temperature, the circulation fan is rotated at a high starting rotation speed, and when the temperature of the heat medium becomes lower than the starting temperature, the bathroom heater is supplied. On / off control of the circulation fan is performed in which the circulation fan is stopped until the temperature of the heat medium becomes equal to or higher than the starting temperature while the circulation supply of the heat medium is continued.

However, when the temperature of the air in the bathroom is low and the circulation fan is rotated at the starting rotation speed and the temperature of the heat medium drops significantly in the heat exchanger, the heat medium is not sufficiently reheated in the low temperature heat source machine, so that the bathroom The temperature of the heat medium that is circulated and supplied to the heater becomes low. As a result, when the heat medium heated by the low temperature heat source machine is circulated and supplied to the bathroom heater, the temperature of the heat medium once rises above the starting temperature to rotate the circulation fan, and then the temperature of the heat medium rises. Below the starting temperature, it takes a long time for the temperature of the heat medium to rise again to the starting temperature. Therefore, after the circulation fan is temporarily activated and a certain amount of warm air is blown into the bathroom, the circulation fan is stopped for a long time. Therefore, when the user is in the bathroom, the bathroom is heated. There is a risk of misidentifying it as a machine failure.

In addition, low temperature air stays in the lower part of the bathroom. Therefore, after the circulation fan has been stopped for a long time due to the decrease in the temperature of the heat medium as described above, the temperature of the heat medium rises again to the starting temperature, and the circulation fan is operated at a high starting rotation speed. When it is rotated, the air volume of the air circulating in the bathroom suddenly increases, so that there is also a problem that the feeling of cold air of the user below the bathroom becomes large.

The present invention solves the above problems, and an object of the present invention is to circulate and supply heat from a low temperature heat source machine in a bathroom heater which is connected to a high temperature heat source machine and a low temperature heat source machine and is circulated and supplied with heat media having different temperatures. The purpose is to suppress the user's discomfort and cold air feeling at the initial stage of the start of heating operation when the heating operation is being performed.

According to the present invention
A bathroom heater that is connected to a high-temperature heat source machine and a low-temperature heat source machine and circulates and supplies heat media with different temperatures.
A heat exchanger that exchanges heat between the heat medium that is circulated and the air in the bathroom,
A circulation fan that sends the air in the bathroom to the heat exchanger and returns the air heated by the heat exchanger to the bathroom.
Bathroom temperature detecting means for detecting the temperature of the air in the bathroom,
A heat medium temperature detecting means for detecting the temperature of the heat medium supplied by circulation,
Equipped with heating control means,
The heating control means rotates the circulation fan at a predetermined starting rotation speed when the temperature of the heat medium becomes equal to or higher than the predetermined starting temperature while being circulated and supplied from the low temperature heat source machine.
When the circulation fan is rotated at the starting rotation speed, if the temperature of the heat medium is lower than the starting speed but is still above the predetermined limit temperature, the circulation fan is rotated at the predetermined limit rotation speed lower than the starting rotation speed. A bathroom heater having a cold air prevention control unit is provided.

According to the above bathroom heater, when the heat medium is circulated and supplied from the low temperature heat source machine at the beginning of the heating operation, when the temperature of the heat medium becomes higher than the starting temperature, the circulation fan is rotated at the starting rotation speed, but at the starting rotation speed. Even if the temperature of the heat medium becomes lower than the starting temperature due to the rotation of the circulation fan, if the temperature is above the limit temperature, the circulation fan is lowered to the limit rotation speed lower than the starting rotation speed without immediately stopping the circulation fan. , The air in the bathroom circulated by the rotation of the circulation fan can be heated to some extent by the heat exchanger. Therefore, although the temperature of the heated air is lower than that when the temperature of the heat medium is equal to or higher than the starting temperature, the air heated to a constant temperature can be continuously circulated in the bathroom. As a result, when the temperature in the bathroom is low, it is possible to suppress the user's discomfort and cold air feeling as compared with the case where the circulation fan is stopped.

Further, according to the bathroom heater, even if the temperature of the heat medium becomes lower than the starting temperature, the circulation fan is rotated at a limit rotation speed lower than the starting rotation speed, so that the air in the bathroom is circulated at a constant air volume. be able to. Therefore, it is less likely that low-temperature air stays in the lower part of the bathroom as compared with the case where the circulation fan is stopped. Further, according to the bathroom heater, when the temperature of the heat medium rises above the starting temperature, the rotation speed of the circulation fan is increased from the limit rotation speed to the starting rotation speed. Therefore, the starting rotation speed is increased from the state where the circulation fan is stopped. There is less change in air volume than when increasing the rotation speed of the circulation fan. As a result, it is possible to suppress the user's feeling of cold air when changing the rotation speed of the circulation fan to the starting rotation speed.

Further, according to the bathroom heater, even if the temperature of the heat medium becomes lower than the starting temperature, the circulation fan is rotated at a limit rotation speed lower than the starting rotation speed, so that the circulation fan can be rotated at a high rotation speed. The temperature of the heat medium drops less than when it is rotated. Therefore, even when the heat medium is circulated and supplied from the low-temperature heat source machine, the heat medium can be efficiently reheated by the low-temperature heat source machine connected to the bathroom heater.

Preferably, in the bathroom heater,
The cold air prevention control unit stops the circulation fan when the temperature of the heat medium becomes lower than the starting temperature after the temperature of the air in the bathroom becomes equal to or higher than the predetermined limit release temperature, even if the temperature exceeds the limit temperature.

For example, when a heat medium utilization terminal other than a bathroom heater is connected to a low temperature heat source machine, the heat medium may not be sufficiently reheated by the low temperature heat source machine, and the temperature of the heat medium may be lower than the starting temperature.
However, if the temperature in the bathroom has risen, the temperature of the heat medium becomes lower than the starting temperature during the execution of the above-mentioned cold air prevention control, the circulation fan is stopped, and then the temperature becomes higher than the starting temperature again. Even if the circulation fan is sometimes rotated at the starting rotation speed, the user does not feel the cold air. Further, if the circulation fan is stopped when the temperature in the bathroom rises and the temperature of the heat medium becomes lower than the starting temperature, the air in the bathroom is not circulated and the heat medium and the bathroom in the heat exchanger are not circulated. Since heat exchange with the air inside is hardly performed, the temperature of the heat medium does not drop much. Therefore, the heat medium can be reheated earlier.

Preferably, in the bathroom heater,
The cold air prevention control unit stops the circulation fan when the temperature of the heat medium becomes less than the limit temperature when the circulation fan is rotated at the limit rotation speed.

If the temperature in the bathroom is very low, the temperature of the heat medium may be lower than the limit temperature even if the circulation fan is rotated at the limit rotation speed. In such a case, the temperature of the heat medium is remarkably lowered by the heat exchange in the heat exchanger, and the heat medium cannot be sufficiently reheated by the low-temperature heat source machine, so that the feeling of cold air becomes large. Therefore, by stopping the circulation fan until the temperature of the heat medium becomes equal to or higher than the limit temperature, the temperature of the heat medium can be raised at an early stage while suppressing the feeling of cold air.

As described above, according to the present invention, in a bathroom heater connected to a high-temperature heat source machine and a low-temperature heat source machine and to which heat media having different temperatures are circulated and supplied, a heating operation when the heat medium is circulated and supplied from the low-temperature heat source machine. Even if the temperature of the heat medium becomes lower than the starting temperature at the initial stage of starting, if the temperature is above the limiting temperature, the circulation fan is rotated at a limited rotation speed lower than the starting rotation speed, so that the air in the bathroom is heated and circulated. Can be made to. As a result, even if the temperature of the heat medium becomes lower than the starting temperature after the circulation fan is operated once, the circulation fan is not stopped for a long time, so that the user does not feel uncomfortable. Further, when the temperature of the heat medium becomes lower than the starting temperature after the circulation fan is rotated at the starting rotation speed, the rotation speed of the circulation fan is limited to the limited rotation speed lower than the starting rotation speed. It is possible to suppress the feeling of cold air due to the low temperature air in the bathroom. Further, even if the temperature of the heat medium becomes lower than the starting temperature, it is rotated at a limit rotation speed lower than the starting rotation speed. Therefore, after the temperature of the heat medium becomes lower than the starting temperature, the temperature becomes higher than the starting temperature and circulates again. It is also possible to prevent the feeling of cold air when the fan is rotated at the starting rotation speed. Therefore, according to the present invention, it is possible to provide a bathroom heater capable of comfortable heating operation.

FIG. 1 is a schematic configuration diagram showing a part of a heating system having a bathroom heater according to an embodiment of the present invention. FIG. 2 is a flowchart showing an example of a control operation in the bathroom heater according to the embodiment of the present invention.

Hereinafter, the bathroom heater according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of a heating system having the bathroom heater 1 of the present embodiment. As shown in FIG. 1, the bathroom heater 1 is connected to the hot water supply / heating unit 2 via the forward pipe 41 and the return pipe 42 that form a part of the heat medium circulation flow path, and heat is generated from the hot water supply / heating unit 2. Water, which is a medium, is circulated and supplied. The heat medium is not limited to water, and different heat media may be used.

The hot water supply heating unit 2 heats the water to a high temperature (for example, 80 ° C.) and heats the water to a low temperature (for example, 60 ° C.) and the gas heat source machine unit 201 that circulates and supplies the high temperature water to the bathroom heater 1. The bathroom heater 1 is provided with a heat pump unit 202 for circulating low-temperature water and a hot water storage tank unit. The hot water supply / heating unit 2 circulates water to a floor heating device (not shown) which is a heat medium utilization terminal other than the bathroom heater 1.

Although not shown, the gas heat source unit 201 includes a gas heat source machine having a conventionally known burner and a heat exchanger, and is circulated and supplied to the bathroom heater 1 by heat exchange with the combustion exhaust generated by burning the burner. Heat the water. The heat pump unit 202 includes a heat pump having a conventionally known compressor, fluid heat exchanger, expansion valve, air heat exchanger, rotary fan, and frost-proof valve, and a refrigerant circulation flow path for circulating the refrigerant. The water to be circulated and supplied to the bathroom heater 1 is heated by heat exchange with the high temperature and high pressure refrigerant supplied from. The hot water storage tank unit 203 is provided with a conventionally known hot water storage tank, and heats the water in the hot water storage tank by circulating it between the gas heat source machine unit 201 and the heat pump unit 202.

As shown in FIG. 1, the going pipe 41 sends the water heated by the hot water supply / heating unit 2 described above to the bathroom heater 1. The return pipe 42 returns the water heat-exchanged by the bathroom heater 1 to the hot water supply / heating unit 2.

The bathroom heater 1 can operate in a heating operation mode for heating the bathroom 5 and a drying operation mode for drying. The bathroom heater 1 includes a water inlet pipe 44 and a water outlet pipe 45 that form a part of the heat medium circulation flow path. Further, the bathroom heater 1 includes a gas-liquid heat exchanger 91, a circulation fan 94, a hot water temperature thermistor 92, a ventilation fan 98, and a bath room temperature thermistor 99.

An outgoing pipe 41 is connected to one end of the water inlet pipe 44. The water sent to the bathroom heater 1 by the going pipe 41 flows into the water inlet pipe 44. A return pipe 42 is connected to one end of the water discharge pipe 45. The water flowing through the drain pipe 45 flows out to the return pipe 42. The water discharge pipe 45 is provided with a flow rate control valve 93. The flow rate control valve 93 controls the flow rate of water flowing through the water inlet pipe 44 and the water outlet pipe 45.

The other end of the water inlet pipe 44 and the other end of the water outlet pipe 45 are connected to the gas-liquid heat exchanger 91, respectively. The water inlet pipe 44 is a pipe that sends the water sent by the outgoing pipe 41 to the gas-liquid heat exchanger 91. The water heated by the hot water supply / heating unit 2 is sent to the gas-liquid heat exchanger 91 by the water inlet pipe 44. The water discharge pipe 45 is a pipe that returns the water heat exchanged by the gas-liquid heat exchanger 91 to the return pipe 42. Water flows out from the gas-liquid heat exchanger 91 to the water discharge pipe 45, and water flows out from the water discharge pipe 45 to the return pipe 42.

The gas-liquid heat exchanger 91 includes, for example, a conventionally known hot water coil. The gas-liquid heat exchanger 91 heats the air sent into the bathroom 5 by heat exchange with the water heated by the hot water supply / heating unit 2 and sent to the gas-liquid heat exchanger 91.

The circulation fan 94 is arranged adjacent to the gas-liquid heat exchanger 91. The circulation fan 94 is driven by a motor 94a. By rotating the circulation fan 94, the air in the bathroom 5 is sent to the gas-liquid heat exchanger 91, and the air heated by the gas-liquid heat exchanger 91 is returned to the bathroom 5. That is, the circulation fan 94 circulates the air in the bathroom 5 between the bathroom 5 and the gas-liquid heat exchanger 91. A variable louver 97 is arranged at a position facing the circulation fan 94. The variable louver 97 changes the direction of the air blown into the bathroom 5 by the circulation fan 94. The variable louver 97 is driven by the motor 97a.

The hot water temperature thermistor 92 is provided in the water inlet pipe 44. The hot water temperature thermista 92 detects the temperature of the water after being heated by the hot water supply / heating unit 2 and before the heat is exchanged by the gas-liquid heat exchanger 91.

A bath room temperature thermistor 99 is arranged in the bathroom heater 1. The bath room temperature thermistor 99 detects the temperature of the air in the bathroom 5 flowing in the bathroom heater 1.

The ventilation fan 98 is driven by the motor 98a. In the dry operation mode of the bathroom heater 1, the ventilation fan 98 rotates to exhaust the moist air in the bathroom 5 to the outside of the bathroom 5 and ventilate the air in the bathroom 5. In the heating operation mode of the bathroom heater 1, the ventilation fan 98 is not operated.

Further, the bathroom heater 1 is provided with a heater controller C for controlling the operation of the bathroom heater 1, and a remote controller R for operating the operation of the bathroom heater 1 is provided at the entrance of the bathroom 5. Although not shown, the remote controller R includes a power switch, a heating operation switch, a drying operation switch, a timer switch, and the like. The heater controller C is a gas controller that controls the operation of the hot water temperature thermistor 92, the flow control valve 93, the motors 94a, 97a, 98a, the bath room temperature thermistor 99, the remote controller R, and the gas heat source unit 201 (not shown) described above. , The heat pump controller that controls the operation of the heat pump unit 202, and the tank controller that controls the operation of the hot water storage tank unit 203 are connected via electrical wiring.

The heater controller C is composed of a microcomputer and controls the heating operation and the drying operation by executing various control programs stored in the memory. Further, as a functional configuration means, the heater controller C is provided from a heat medium temperature detecting unit for detecting the temperature of water circulated and supplied to the bathroom heater 1 based on a detection signal from the hot water temperature thermista 92, and a bath room temperature thermista 99. Based on the temperature of the water detected by the hot water temperature thermista 92 and the temperature of the air in the bathroom 5 detected by the bath room temperature thermista 99, the bathroom temperature detector that detects the temperature of the air in the bathroom 5 based on the detection signal of The temperature of the air in the bathroom 5 is maintained at a predetermined temperature control temperature based on the temperature of the air in the bathroom 5 detected by the cold air prevention control unit that controls the operation / stop and the rotation speed of the circulation fan 94 and the bath room temperature thermista 99. A temperature control unit for controlling the rotation speed of the circulation fan 94 is provided. Further, in the memory of the heater controller C, a data table of each characteristic value such as temperature and rotation speed for executing various control programs is stored. Therefore, in the present embodiment, the heater controller C constitutes the heating control means.

Next, the control operation when the heating operation is executed by the bathroom heater 1 of the present embodiment will be described with reference to FIG. Although not shown, in the bathroom heater 1, when the heating switch of the remote controller R is turned on and the heating operation is started, the low temperature water heated by the heat pump unit 202 is circulated and supplied to the bathroom heater 1. .. Further, even when the heat pump unit 202 heats the water, when the temperature of the water flowing in the hot water supply / heating unit 2 becomes a low temperature equal to or lower than a predetermined lower limit temperature, the heating path is switched and the water heated by the gas heat source unit 201 heats the bathroom. It is configured to be circulated and supplied to the machine 1. Further, in the bathroom heater 1, when the temperature of the air in the bathroom 5 detected by the bath room temperature thermistor 99 during the heating operation becomes a temperature control temperature (for example, 27 ° C.) higher than the limit release temperature described later. In order to maintain the temperature control temperature, the rotation speed of the circulation fan 94 is set to a predetermined high rotation speed for temperature control (for example, strong wind of 1,100 rpm) and a predetermined low speed for temperature control according to the temperature of the air in the bathroom 5. It is configured to switch between the number of revolutions (eg, medium wind at 1,050 rpm).

When the heating switch of the remote controller R is turned on, the heating path is switched so that the water heated by the heat pump unit 202 is circulated and supplied to the bathroom heater 1, and the heating operation is started. When the heating operation is started, the cold air prevention control program is started. In this cold air prevention control, first, the circulation fan 94 is made to stand by in a stopped state until the water temperature Tw detected by the hot water temperature thermistor 92 rises to a predetermined starting temperature T1 (for example, 40 ° C.) or higher (step ST1). ). As a result, the air blown by the circulation fan 94 can be started after the temperature of the gas-liquid heat exchanger 91 rises.

When the water temperature Tw detected by the hot water temperature thermistor 92 rises to the starting temperature T1 or higher, the circulation fan 94 is rotated at a predetermined starting rotation speed R1 (for example, a strong wind of 1,100 rpm) (step ST2). As a result, the air is heated by heat exchange with the heated water in the gas-liquid heat exchanger 91, and the heated air is returned to the bathroom 5.

When the circulation fan 94 is rotated at the starting rotation speed R1 and the water temperature Tw detected by the hot water temperature thermistor 92 becomes less than the starting temperature T1 (Yes in step ST3), the rotation speed of the circulation fan 94 is started. The temperature is reduced to a predetermined limit rotation speed R2 (for example, a breeze of 800 rpm) lower than the rotation speed R1 (step ST4). As a result, even if the water temperature Tw becomes lower than the starting temperature T1, the air in the bathroom 5 is circulated by the circulation fan 94.

It is preferable that the limit rotation speed R2 is set not only to be lower than the starting rotation speed R1 but also to a rotation speed lower than the low temperature control rotation speed. That is, in the temperature control during the heating operation, after the temperature of the air in the bathroom 5 detected by the bath room temperature thermistor 99 rises to the temperature control temperature, the rotation speed of the circulation fan 94 is maintained so that the temperature control temperature is maintained. Is controlled. Therefore, even if the circulation fan 94 is rotated at a high rotation speed in order to raise or lower the temperature of the air in the bathroom 5, it is difficult to feel a cold wind feeling as in the initial stage of the heating operation. On the other hand, as described above, the temperature of the air in the bathroom 5 is often low at the initial stage of the heating operation, so that the feeling of cold air becomes large. Therefore, by rotating the circulation fan 94 at a limit rotation speed R2 lower than the low rotation speed for temperature control in the temperature control, the air in the bathroom 5 can be circulated while suppressing the feeling of cold air.

By rotating the circulation fan 94 at the limit rotation speed R2, when the water temperature Tw rises again to the starting temperature T1 (Yes in step ST6), the rotation speed of the circulation fan 94 is increased to the starting rotation speed R1. , The air in the bathroom 5 is circulated (step ST7).

At this time, if the temperature Ta of the air in the bathroom 5 detected by the bath room temperature thermistor 99 does not rise above the predetermined limit release temperature T3 (for example, 25 ° C.) (No in step ST8), the above-mentioned limitation Based on the temperature T2 and the starting temperature T1, the rotation speed of the circulation fan 94 is increased or decreased between the limiting rotation speed R2 and the starting rotation speed R1 (steps ST3 to ST7).

On the other hand, if the temperature Ta of the air in the bathroom 5 detected by the bath room temperature thermistor 99 is equal to or higher than the limit release temperature T3 (Yes in step ST8), whether the water temperature Tw is equal to or higher than the starting temperature T1. Based only on this, the circulation fan 94 is controlled to be turned on and off at the starting rotation speed R1 (steps ST9 to ST12). That is, even if the circulation fan 94 is stopped when the temperature in the bathroom 5 rises and the circulation fan 94 is rotated at the starting rotation speed R1 when the water temperature Tw becomes the starting temperature T1 or higher again, it is used. There is little feeling of cold wind. Further, if the circulation fan 94 is stopped when the temperature in the bathroom 5 rises and the temperature Tw of the water becomes lower than the starting temperature T1, the air in the bathroom 5 is not circulated and the gas-liquid heat exchanger is not circulated. Since heat exchange between the water in 91 and the air in the bathroom 5 is hardly performed, the temperature of the water does not decrease much. Therefore, the water can be reheated earlier. Therefore, when the temperature Ta of the air in the bathroom 5 is the limit release temperature T3 or more and the temperature Tw of the water becomes less than the starting temperature T1, the circulation fan 94 is stopped, and when the temperature Tw of the water becomes the starting temperature T1 or more, The circulation fan 94 is rotated at the starting rotation temperature R1.

If the water temperature Tw detected by the hot water temperature thermistor 92 is less than the limit temperature T2 even when the circulation fan 94 is rotated at the limit rotation speed R2 (No in step ST5), the air in the bathroom 5 is gently circulated. Even if the heat is exchanged, the temperature Tw of the water drops significantly, and it is difficult to reheat the water to the starting temperature T1 by the heat pump in the state where the air in the bathroom 5 is circulated. Therefore, the circulation fan 94 is stopped and waits for the water temperature Tw to rise to the starting temperature T1 (steps ST13 and ST1).

As described in detail above, according to the bathroom heater 1, when the low-temperature water heated by the heat pump, which is a low-temperature heat source machine, is circulated and supplied and the heating operation is started, the temperature of the circulated water is supplied. When the temperature rises above the starting temperature, the circulation fan 94 is rotated at a high starting rotation speed. Since the circulation fan 94 is rotated at a limit rotation speed sufficiently lower than the starting rotation speed without stopping the 94, the air in the bathroom 5 circulated by the rotation of the circulation fan 94 is heated to some extent by the gas-liquid heat exchanger 91. can do. That is, in the cold air prevention control, a limit temperature lower than the starting temperature is set, and if the water temperature is equal to or higher than the limit temperature and lower than the starting temperature, the circulation fan 94 is rotated at a limit rotation speed lower than the starting rotation speed. .. Therefore, although the temperature of the heated air is lower than that when the temperature of the water is equal to or higher than the starting temperature, the air heated to a certain temperature can be continuously circulated in the bathroom 5. As a result, when the temperature in the bathroom 5 is low, the user feels less discomfort and the feeling of cold air can be suppressed as compared with the case where the circulation fan 94 is stopped for a long time.

Further, according to the bathroom heater 1, when the temperature of water becomes lower than the starting temperature, the circulation fan 94 is rotated at a limited rotation speed, so that the air in the bathroom 5 can be circulated at a constant air volume. Therefore, it is difficult for low-temperature air to stay in the lower part of the bathroom 5. Further, when the water temperature rises above the starting temperature, the rotation speed of the circulation fan 94 is increased from the limit rotation speed to the starting rotation speed. Therefore, the rotation speed of the circulation fan 94 is changed from the stopped state of the circulation fan 94 to the starting rotation speed. There is less change in air volume than when increasing. As a result, it is possible to suppress the user's feeling of cold air when changing the rotation speed of the circulation fan 94 to the starting rotation speed.

Further, according to the bathroom heater 1, since the circulation fan 94 is rotated at a limit rotation speed lower than the starting rotation speed, water is compared with the case where the circulation fan 94 is rotated at a high rotation speed starting rotation speed. There is little decrease in temperature. Therefore, even when the low-temperature water heated by the heat pump is circulated and supplied, the water can be efficiently reheated by the heat pump.

In the above embodiment, a gas heat source machine is used as the high temperature heat source machine and a heat pump is used as the low temperature heat source machine, but other heat source machines such as an electric heat source machine may be used. Further, in the above embodiment, one limit temperature and one limit rotation speed are set, but a plurality of these may be set respectively.

1 Bathroom heater 91 Gas-liquid heat exchanger 92 Hot water temperature thermistor 94 Circulation fan 99 Bath room temperature thermistor 201 Gas heat source machine unit 202 Heat pump unit C Heater controller

Claims (3)

A bathroom heater that is connected to a high-temperature heat source machine and a low-temperature heat source machine and circulates and supplies heat media with different temperatures.
A heat exchanger that exchanges heat between the heat medium that is circulated and the air in the bathroom,
A circulation fan that sends the air in the bathroom to the heat exchanger and returns the air heated by the heat exchanger to the bathroom.
Bathroom temperature detecting means for detecting the temperature of the air in the bathroom,
A heat medium temperature detecting means for detecting the temperature of the heat medium supplied by circulation,
Equipped with heating control means,
The heating control means rotates the circulation fan at a predetermined starting rotation speed when the temperature of the heat medium becomes equal to or higher than the predetermined starting temperature while being circulated and supplied from the low temperature heat source machine.
When the circulation fan is rotated at the starting rotation speed, if the temperature of the heat medium is lower than the starting speed but is above the predetermined limit temperature, the circulation fan is rotated at the predetermined limit rotation speed lower than the starting rotation speed. A bathroom heater with a cold air prevention control unit. In the bathroom heater according to claim 1,
The cold air prevention control unit stops the circulation fan when the temperature of the heat medium becomes lower than the starting temperature after the temperature of the air in the bathroom reaches the predetermined limit release temperature or higher, even if the temperature exceeds the limit temperature. Machine. In the bathroom heater according to claim 1 or 2.
The cold air prevention control unit is a bathroom heater that stops the circulation fan when the temperature of the heat medium falls below the limit temperature when the circulation fan is rotated at the limit rotation speed.

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