KR100529977B1 - Heat pump type hot water supply apparatus - Google Patents

Abstract

An object of the present invention is to provide a heat pump type hot water supply device, which is capable of stabilizing control of compressor capacity and change of opening degree of an electric expansion valve for a short time change in movement of outside air temperature. The outside air temperature is detected at a predetermined time, the compressor capacity is controlled according to a predetermined criterion for the change of the detected outside air temperature, and the opening degree of the electric expansion valve is controlled according to the predetermined criterion.

Description

Heat pump type hot water supply equipment {HEAT PUMP TYPE HOT WATER SUPPLY APPARATUS}

The present invention relates to a heat pump type hot water supply device, in particular a heat pump type hot water supply device having a control device for controlling the compressor capacity and the opening degree of the electric expansion valve.

In general, a heat pump type hot water supply device includes a refrigeration cycle device having a refrigerant circuit in which a compressor, a high pressure side heat exchanger, a refrigerant expansion device, and an evaporator are connected in series, and is drawn from the outside air by the heat pump action of the refrigeration cycle device. Heated water is heated by releasing the amount of heat raised to hot water using a high pressure side heat exchanger.

In addition, the heat pump type hot water supply device is generally operated all year round, but the hot water supply water heating capacity changes due to the change in the outside air temperature. For example, outside air temperature falls, evaporation pressure falls, the capability of a compressor falls, and high pressure pressure falls. For this reason, there exists a problem that the hot water supply water heating capability falls, and the temperature of the heated hot water supply water also becomes low. For this reason, in the conventional heat pump type hot water supply apparatus, generally, the compressor ability with respect to the fall of external air temperature was improved, and the maintenance of the heating capability of hot water supply water, and the maintenance of the temperature of hot water supply water was aimed at.

However, conventionally, the outside air temperature has always been detected, and the capacity of the compressor has been changed in accordance with the change of the outside air temperature. In addition, the outside air temperature generally does not change rapidly, but depending on the installation conditions, the air temperature around the evaporator moves up and down in a short time depending on the change in the amount of insolation due to the movement of the clouds, the occurrence or change of the rainstorm, and the like. There is work to do. In this case, in the conventional hot water supply apparatus, the compressor capacity was changing up and down with the vertical change of the outside air temperature. For this reason, the expansion valve could not change the opening degree stably, but there existed a problem that contraction or expansion of an opening degree was caused. As a result, there has been a problem that a backflow is generated by the compressor and the life of the compressor is shortened.

The present invention has been made in view of the problems existing in such a conventional technology. It is an object of the present invention to provide a heat pump type hot water supply device which stabilizes the control of the compressor capacity and the control of the opening degree of the electric expansion valve with respect to the short time vertical movement change of the outside air temperature.

In order to achieve the above object, the present invention provides a refrigeration cycle apparatus having a refrigerant circuit in which an inverter driven compressor, a high pressure side heat exchanger, a refrigerant expansion device, and an evaporator are connected in series, and a heat pump action of the refrigeration cycle device. The storage tank for storing the heated hot water, and the outside air temperature are detected at a predetermined time to control the compressor capacity according to a predetermined criterion for the change of the detected outside air temperature, and at the same time, It is provided with the control apparatus which controls an opening degree.

With such a configuration, even if the outside air temperature may move up and down in a short time, the change in vertical movement in a short time is not detected in this way, and thus the compressor capacity does not change in a short time. Therefore, it is possible to stably control the compressor capacity and the opening degree control of the electric expansion valve with respect to the up and down change of the outside air temperature for a short time, and it is possible to avoid the deterioration of the life of the compressor.

In this case, it is preferable that the control device performs the detection of the outside temperature every about 30 minutes.

In this way, by detecting the outside air temperature at appropriate time intervals, it is possible to appropriately control the compressor capacity and the opening degree of the electric expansion valve with respect to the outside air temperature change.

In addition, the control device may control the rotation speed of the inverter-driven compressor so that the compressor capacity becomes approximately a predetermined value against the detected decrease in the outside air temperature.

If comprised in this way, it is possible to maintain the hot water supply water heating capability and the temperature of hot water supply water at a predetermined value with respect to the detected fall of the outdoor air temperature.

In addition, the control device may control the rotation speed of the inverter-driven compressor so that the compressor capacity becomes substantially constant against the decrease in the outside air temperature.

If comprised in this way, it is possible to prevent the fall of hot water supply heater capacity | capacitance, and the hot water supply water temperature fall with respect to the fall of external air temperature.

The present invention also provides a refrigeration cycle apparatus having a refrigerant circuit in which an inverter driven compressor, a high pressure side heat exchanger, a refrigerant expansion device, and an evaporator are connected in series, and a hot water supply heated by the heat pump action of the refrigeration cycle device. The operation temperature of the inverter-driven two-stage compressor according to a predetermined criterion from the storage tank and the outside air temperature for each predetermined time, and the detected outside air temperature and the target heating completion temperature set for the outside air temperature. It is good also as it has a control apparatus which controls the opening degree of an electric motor expansion valve.

With such a configuration, the hot water is not always heated to a constant temperature regardless of the outside temperature, and the temperature is appropriate to the general demand (for example, the heating completion temperature of the hot water to be stored in the hot water tank may be low). It is possible to prevent heating of the hot water of supply more than necessary, and to perform operation with little waste.

The present invention also relates to a refrigeration cycle apparatus having a refrigerant circuit in which an inverter driven compressor, a high pressure side heat exchanger, a refrigerant expansion device, and an evaporator are connected in series, and a hot water supply storage heated by the heat pumping action of the refrigeration cycle device. According to a predetermined criterion according to a predetermined criterion according to a predetermined criterion, the storage tank and the outside air temperature are detected at predetermined time intervals, and the detected outside air temperature and the target heating completion temperature set for the intended use amount of the hot water supply water selected by the user. It is good also as it has a control apparatus which controls the operating frequency of the said inverter driven compressor, and the said electric expansion valve.

With this configuration, the hot water supply is not always heated to a constant temperature regardless of the outdoor temperature, and operation control which grasps a more detailed change in the demand demand for the change in the outdoor temperature is performed, thereby preventing the hot water supply from being heated more than necessary. In this way, it is possible to perform operation with less waste.

In addition, in such a case, it is preferable to perform the detection of the control device and the outside air temperature about every 30 minutes in the same manner as in the above case.

In this way, by detecting the outside air temperature at appropriate time intervals, it is possible to appropriately control the compressor capacity and the opening degree control of the electric expansion valve with respect to the outside air temperature change.

The refrigeration cycle apparatus may be a supercritical refrigeration cycle apparatus filled with carbon dioxide as a refrigerant.

With such a configuration, it is possible to supply hot water for hot water sufficiently in winter while using a natural refrigerant having no flammability and no toxicity.

The inverter-driven compressor may be an inverter-driven two-stage compressor in which the low stage side compressor and the high stage side compressor are incorporated in the hermetic housing and the space in the hermetic housing is filled with the discharge gas of the low stage side compressor.

In such a configuration, the compression ratio of the compressor is reduced. Therefore, in the refrigeration cycle apparatus used for the heat pump type hot water supply apparatus which becomes high and low pressure difference, it is possible to raise the operation efficiency of a compressor. In addition, since the surrounding gas of the low stage compressor and the high stage compressor is the discharge gas of the low stage compressor having an intermediate pressure, it is possible to obtain a compressor of high reliability, low vibration, low noise, and high efficiency without large force acting on each part of each stage compressor. Do.

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of this invention is described in detail, referring drawings. 1 is a circuit diagram of a heat pump type hot water supply apparatus according to a first embodiment of the present invention, in which the solid line arrow shows the flow of refrigerant, and the dotted line arrow shows the flow of hot water.

As shown in FIG. 1, the hot water supply device according to the first embodiment includes a refrigeration cycle device 1, a hot water supply unit 2, and a control device 3. In addition, in this embodiment, the control apparatus 3 is provided in the refrigeration cycle apparatus. In addition, the refrigeration cycle apparatus 1 and the hot water supply unit 2 are connected by the communication water pipes 5 and 6.

The refrigeration cycle apparatus 1 includes a refrigerant circuit (closed circuit) in which a two-stage compressor 11, a high pressure side heat exchanger 12, an electric expansion valve 13, an evaporator 14, and an accumulator 15 are sequentially connected. One supercritical refrigeration cycle device. Inside this refrigerant circuit, carbon dioxide (CO ₂ ) is charged as an alternative refrigerant operated in a supercritical refrigeration cycle. Representative natural refrigerants for refrigeration and air conditioning include hydrocarbons (HC: propane and isobutane), ammonia, air, and CO ₂ . However, as refrigerant characteristics, hydrocarbons and ammonia have good energy efficiency while having flammability and toxicity problems, and air has low energy efficiency outside the cryogenic region. On the other hand, carbon dioxide is safe without flammability or toxicity.

The two-stage compressor incorporates a low stage compressor 11a, a high stage compressor 11b, and a common compressor electric motor 11c for driving these compressors 11a and 11b in a hermetic housing, and the low stage compressor 11a. The discharge side and the suction side of the high stage compressor 11b are connected by a pipe 11d. In addition, the space in the hermetic housing is filled with the intermediate pressure gas, that is, the discharge gas of the low stage side compressor. In addition, the reason why the inside pressure of the hermetic housing is made into the intermediate pressure in this way is to maintain the force which acts on each part of each compressor, and the pressure difference between the inside and the outside of the hermetic housing within an appropriate range, and to avoid a big force acting, This makes it possible to achieve a high reliability, low vibration, low noise and high efficiency compressor.

The compressor motor of the two stage compressor 11 is an inverter driven two stage compressor that is inverter controlled. Moreover, the compressor capability is controlled by the control apparatus 3 mentioned later according to the predetermined | standard reference about the change of external air temperature. Moreover, the discharge gas temperature detector 31 for detecting the discharge gas temperature discharged from the high stage compressor 11b is provided in the discharge piping of the high stage compressor 11b.

The high pressure side heat exchanger 12 is a hot water supply tube 12a for introducing a high pressure refrigerant discharged from the high stage compressor 11b and a hot water supplied from a storage tank 21 arranged in the hot water supply unit 2. It consists of the receiving heat exchange tube 12b which introduces water, and both sides are formed in heat exchange relationship. Therefore, the high temperature and high pressure refrigerant gas discharged from the high stage compressor 11b is cooled by the hot water supply water supplied from the boiling water tank 21, and the hot water supply water is heated by the heat generated by the high temperature high pressure refrigerant.

The electric expansion valve 13 reduces the high pressure gas refrigerant cooled by the high pressure side heat exchanger 12 and is driven by a pulse motor. In addition, it is controlled by the control apparatus 3 mentioned later according to a predetermined reference | standard.

The evaporator 14 heat-exchanges the low-pressure gas-liquid mixed refrigerant decompressed by the electric expansion valve 13 with the outside as a heat source medium, and vaporizes the refrigerant. In addition, the evaporator 14 is provided with an outside air temperature detector 32 for detecting the outside air temperature.

The hot water supply unit 2 is configured to include a water storage tank 21, a hot water circulation pump 22, a hot water supply pipe 23, and a water supply pipe 24.

The upper and lower portions of the storage tank 21 are connected to the accommodating heat exchange tube 12b by a hot water circulation circuit P including the plumbing pipes 5 and 6. In addition, in the water storage tank 21, the hot water temperature increases as it becomes an upper part by the difference of specific gravity. Thus, water having a low temperature in the lower portion of the storage tank 21 is delivered to the accommodating heat exchange tube 12b, and water having a high temperature heated in the accommodating heat exchange tube 12b is transferred to the upper portion of the storage tank 21. The hot water circulation circuit P is formed, and the hot water circulation circuit 22 is provided in this hot water circulation circuit P. As shown in FIG. In addition, the hot water temperature of the upper part in the storage tank 21, ie, the heating completion temperature, is measured by the heating completed temperature detector 33 provided in the upper part of the storage tank 21.

The hot water supply pipe 23 is for supplying hot water to hot water tap water, a bath, and the like, and is connected to an upper portion of the hot water tank 21 so that hot water of a high temperature in the hot water tank 21 can be supplied. In addition, an on-off valve 25 is provided in this hot water circuit. The water supply pipe 24 allows constant tap water to be supplied into the water storage tank 21, and is connected to the bottom of the water storage tank 21 via the backflow prevention valve 26 and the pressure reducing valve 27.

As described above, the controller 3 is an inverter-driven two-stage compressor 11 in which the operating frequency of the compressor electric motor 11c is set in accordance with a predetermined criterion so that a predetermined compressor capacity is obtained with respect to a change in the outside air temperature. ), And the degree of opening of the electric expansion valve 13 is controlled based on a predetermined criterion.

Next, the control of the operating frequency of the inverter drive type two-stage compressor 11 by the control device 3 will be described based on the drawings. 2 is a control flowchart of the inverter drive type two stage compressor 11 at the time of normal operation after completion of the initial setting operation according to the first embodiment.

As shown in this figure, the inverter-driven two-stage compressor 11 is operated under an initial setting condition, and after entering normal operation, the outside air temperature is measured by the outside air temperature detector 32 (step S1). Then, it is compared with the outside air temperature at the time of the previous measurement (step S2). As a result of the comparison, when there is a temperature difference on both sides, the operating frequency of the compressor motor 11c based on this temperature difference is determined according to a predetermined criterion (step S3), and the inverter drive type two stage compressor 11 is used at this frequency. (Step S5). In this case, the operating frequency of the inverter-driven two-stage compressor 11 is determined so that the compressor capacity becomes approximately a predetermined value or approximately constant with respect to the decrease in the outside air temperature. As a result of the comparison, when there is no temperature difference on both sides, it is assumed that the operating frequency of the compressor motor 11c is not changed (step S4), and the inverter drive type two stage compressor 11 is operated at the operating frequency as it is. It drives (step S5). Then, after waiting for a predetermined time (step S6), the above-described steps are repeated. In addition, it is thought that about 30 minutes is suitable as this predetermined time from the balance of the density | concentration of the situation grasp of the outside air temperature change, and the necessity to remove the damage by the up-and-down movement change of the outside air temperature in a short time.

Next, the opening degree control of the motor expansion valve 13 by this control apparatus 3 is demonstrated based on FIG. 3 is a control flowchart of the opening degree of the electric expansion valve 13 at the time of normal operation after completion | finish of initial stage setting operation | movement in connection with 1st Embodiment.

As shown in FIG. 3, the discharge gas temperature of the high stage compressor 11b is measured by the discharge gas temperature detector 31 (step S11), and the temperature difference with the target discharge gas temperature preset is calculated. (Step S12). Then, the opening degree (number of operating pulses) of the electric expansion valve 13 is determined based on this temperature difference according to a predetermined standard (step S13), and the electric expansion valve 13 is operated at this opening degree (step S14). . In this case, the target discharge gas temperature is not set arbitrarily by the user, but can also be set in advance with respect to the outside air temperature as a design specification of the device. In this case, however, it is necessary to measure the outside air temperature in the previous step. After the waiting for a predetermined time (step S15), the above-described steps are repeated. In addition, this predetermined time should just be short time of the grade performed with respect to control of a normal electric expansion valve, and it does not need to be related to the predetermined time in case of outdoor temperature detection.

According to the first embodiment configured as described above, the outside air temperature by the outside air temperature detector 32 is detected at a predetermined time, and the compressor capacity is controlled according to a predetermined standard with respect to the detected change in the outside air temperature, By controlling the opening degree of the electric expansion valve 13 according to a reference | standard, even if the outside air temperature may move up and down in a short time, the outside air temperature detector 32 does not detect such a fluctuation. Therefore, the compressor capacity does not fluctuate in a short time, and control of the opening degree of the electric expansion valve 13 is performed stably. For this reason, the backflow to the compressor which arises because the control of the opening degree of the electric expansion valve 13 becomes unstable can be prevented, and the inverter drive type two-stage compressor 11 can be extended in life.

In addition, since the outside air temperature is detected about every 30 minutes, it is not possible to detect the change of the outside air temperature for a short time, and it is also possible to grasp | ascertain the change situation of the outside air temperature suitably.

In addition, the controller 3 increases the number of revolutions of the inverter-driven compressor 11 so that the compressor capacity becomes approximately constant or approximately a predetermined value with respect to the detected decrease in the outside air temperature, thereby reducing the compressor capacity against the decrease in the outside air temperature. Can be maintained at a substantially constant value or approximately a predetermined value, and the heating ability of the hot water supply water and the temperature of the hot water supply water can be prevented from decreasing in accordance with the outside air temperature, and can be set to a substantially constant value and a substantially predetermined value.

In addition, since the refrigeration cycle apparatus 1 is a supercritical refrigeration cycle apparatus filled with carbon dioxide as the refrigerant, it is possible to supply hot water for hot water sufficiently in winter while using a natural refrigerant without flammability or toxicity.

Moreover, the compressor used for the refrigeration cycle apparatus 1 incorporates the low stage compressor 11a and the high stage compressor 11b in the hermetic housing, and discharges the gas in the hermetic housing into the space inside the hermetic housing 11a. In the refrigeration cycle apparatus used for the heat pump type hot water supply apparatus in which the high and low pressure difference becomes large, the compression ratio of each stage becomes small and the operation efficiency of a compressor can be raised. Moreover, since the circumference | surroundings of the low stage side compressor 11a and the high stage side compressor 11b turn into discharge gas of the low stage side compressor 11a which is intermediate pressure, a large force does not act on each part of each stage compressor, and it is high reliability and low vibration. A compressor with low noise and high efficiency can be obtained.

2nd embodiment

Next, in 2nd Embodiment, it demonstrates based on FIG. 4 is a control flowchart of the operating frequency of the inverter-driven two-stage compressor and the opening degree of the electric expansion valve in the normal operation after the completion of the initial setting operation. Fig. 6 is a diagram showing a setting example of the operating frequency of the compressor with respect to the ambient air temperature and the target heating completion temperature in the second embodiment, and Fig. 6 is a compressor discharge gas with respect to the ambient air temperature and the target heating completion temperature in the second embodiment. It is a figure which shows the example of setting the target discharge gas temperature.

In 2nd Embodiment, the structure of the refrigeration cycle apparatus 1 and the hot water supply unit 2 is the same as that of 1st Embodiment, and the operation frequency control of the inverter drive type two stage compressor 11 by the control apparatus 3, By making the opening degree control of the electric expansion valve 13 more suitable to a demand request, it controls as follows.

As shown in Fig. 4, after the electric expansion valve 13 is set to a predetermined opening degree under an initial setting condition, and the inverter driven two-stage compressor 11 is operated at a predetermined frequency, an outside air temperature detector ( 32), the outside air temperature is measured (step S21). Then, the operating frequency of the inverter drive type two-stage compressor 11 is determined according to a predetermined criterion from the outside air temperature and the target heating completion temperature set for the outside air temperature (step S22). Further, the target discharge gas temperature of the high stage compressor 11b is determined from the measured outside air temperature and the target heating completion temperature set for the outside air temperature according to a predetermined reference (step S23). In addition, the discharge gas temperature of the high stage compressor 11b is measured by the discharge gas temperature detector 31 (step S24). Then, the temperature difference between the discharge gas temperature and the target discharge gas temperature determined by step S23 is calculated (step S25), and the opening degree (that is, operation) of the electric expansion valve 13 is determined according to a predetermined criterion based on this temperature difference. The number of pulses) (step S26). Then, the inverter drive type two-stage compressor 11 is operated at the operation frequency determined in step S22, and the electric expansion valve 13 is operated by the opening degree determined in step S26 (step S27). Then, after the predetermined time has elapsed (step S28), the above procedure is repeated.

In the above control, the target heating completion temperature used in step 23 is set in advance from the measured outside air temperature and the target usage amount selected by the user.

In addition, the target usage amount is selected by the user based on the user's prediction among three stages of "enough", "normal", and "saving" shown in Table 1. In addition, "sufficient" means more than "normal", and "saving" means that it is set less than "normal".

Then, the target usage amount is selected by the above, and the target heating completion temperature is set according to the table in Table 1.

[Table 1] Target heating completion temperature (℃)

Ambient temperature (℃) Less than 5 5 or more and less than 15 15 or more but less than 25 25 or more Driving mode Saving 75 60 60 60 usually 75 75 75 75 enough 85 85 85 75

Next, the operation frequency of the inverter drive type two stage compressor 11 in the step 22 is determined according to FIG. 5. For example, if the target heating completion temperature is 60 deg. C and the outside air temperature is 30 deg. C, as shown in Fig. 5, the operating frequency of the inverter driven two-stage compressor 11 is determined to be about 88 Hz.

In step 23, determination of the target discharge gas temperature from the measured outside air temperature and the target heating completion temperature previously selected by the user is set as shown in FIG. For example, if the target heating completion temperature is 60 ° C and the outside air temperature is 30 ° C, the target discharge gas temperature is about 97 ° C, as derived from FIG.

In addition, the predetermined time in step 28 is about 30 minutes from the viewpoint of the compactness of the situation grasp of the change in the outside air temperature and the elimination of the damage caused by the vertical movement of the outside temperature in a short time.

As described above, according to the second embodiment, the outside air temperature is detected at a predetermined time, and the inverter-driven two-stage compressor 11 is installed according to a predetermined criterion from the detected outside air temperature and the target heating completion temperature set for the outside air temperature. By controlling the operation frequency and the degree of opening of the electric expansion valve 13, operation control corresponding to a change in demand demand is made with respect to the change in the outside air temperature, and the waste water is not heated more than necessary, and waste is little. You can drive.

In addition, according to this second embodiment, the outside air temperature is detected every fixed time, and from the detected outside air temperature and the target heating completion temperature set with respect to the predetermined amount of use of the hot water supply water selected by the user, the predetermined temperature is determined. By controlling the operating frequency of the inverter-driven two-stage compressor 11 and the degree of opening of the electric expansion valve 13 according to the criteria of, the operation control grasping a more detailed change in the demand demand for the change in the outside air temperature is performed, The above operation can be prevented from heating the hot water supply, and the operation with less waste can be performed.

In the 1st and 2nd embodiment demonstrated above, although the refrigeration cycle apparatus 1 is a supercritical refrigeration cycle apparatus, it cannot be overemphasized that it can be set as a normal refrigeration cycle apparatus, without being limited to such a refrigeration cycle apparatus.

In addition, in the said 1st and 2nd embodiment, although the compressor is the inverter drive type two stage compressor 11, when this compressor is used as an inverter drive type single stage compressor, of course, this invention can be applied. to be.

Since this invention is comprised as mentioned above, it has the following effects.

According to the invention of claim 1, the outside air temperature is detected at a predetermined time to control the compressor capacity according to a predetermined criterion with respect to the detected change in the outside air temperature, and the opening degree of the electric expansion valve is controlled according to the predetermined criterion. By doing so, even if the outside air temperature may move up and down in a short time, such a fluctuation is not detected. Therefore, the compressor capacity does not fluctuate in a short time, and control of the opening degree of the electric expansion valve is performed stably. For this reason, backflow to a compressor by the opening degree control of an electric expansion valve becomes unstable can be prevented, and the lifetime of a compressor can be extended.

According to the invention described in claim 2, in the invention according to claim 1, since the outside air temperature is detected at about 30 minutes, the change in the outside air temperature for a short time is not detected, and the change situation of the outside air temperature is appropriate. You can figure it out.

Further, according to the invention of claim 3, in the invention of claim 1 or 2, the control device controls the number of revolutions of the inverter-driven compressor so that the compressor capacity becomes approximately a predetermined value against the decrease in the detected outside air temperature. With respect to the decrease in the outside air temperature, the hot water supply water heating capability and the hot water supply temperature can be maintained at a predetermined value.

Further, according to the invention of claim 4, in the invention of claim 1 or 2, the control device controls the number of revolutions of the inverter-driven compressor so that the compressor capacity is approximately constant with respect to the detected decrease in the outside air temperature. With respect to the decrease in the outdoor air temperature, the decrease in the hot water supply water heating ability and the decrease in the hot water supply water temperature can be prevented.

Further, according to the invention of claim 5, the outside air temperature is detected every fixed time, and the inverter drive type two-stage according to a predetermined criterion from the detected outside air temperature and the target heating completion temperature set for the outside air temperature. Since it has the control apparatus which controls the operation frequency of a compressor and the opening degree of the said electric expansion valve, operation control corresponding to a change in demand demand is performed with respect to the change of external air temperature, and it does not heat hot water supply more than necessary, Driving with less waste can be performed.

Moreover, according to invention of Claim 6, the outside air temperature is detected every fixed time, and from this detected outside air temperature, and the target heating completion temperature set with respect to the usage-amount of hot water supply water selected by the user, Since the control device which controls the operation frequency of the said inverter-driven compressor and the opening degree of the said electric expansion valve according to a predetermined | prescribed criterion is provided, operation control which grasp | ascertains the change more detailed than the demand request | requirement of the change of external temperature is performed, It is possible to prevent the heating of the hot water of the water more than necessary, and to perform the operation with less waste.

In addition, according to the invention described in claim 7, in the invention according to claim 5 or 6, since the outside air temperature is detected every about 30 minutes, the change in the outside air temperature for a short time is not detected, and furthermore, the change in the outside air temperature. You can also grasp the situation appropriately.

According to the invention of claim 8, in the invention according to any one of claims 1 to 7, the refrigeration cycle apparatus is a supercritical refrigeration cycle apparatus filled with carbon dioxide as a refrigerant, and thus has no flammability or toxicity. In the winter, hot water supply water can be sufficiently supplied while using a natural refrigerant.

In the invention according to claim 9, in the invention according to any one of claims 1 to 8, the compressor used in the refrigeration cycle apparatus includes a low stage compressor and a high stage compressor in a hermetic housing. Since the inverter-driven two-stage compressor is filled with the discharge gas of the low stage compressor, the refrigeration cycle apparatus used in the heat pump type hot water supply apparatus, in which the high and low pressure difference increases, the compression ratio at each stage is reduced, and the compressor operation is performed. The efficiency can be raised. In addition, since the surrounding gas of the low stage compressor and the high stage compressor is discharge gas of the low stage compressor of medium pressure, a large force does not act on each part of each stage compressor, and the compressor is highly reliable, low vibration, low noise and high efficiency. Can be.

1 is a circuit diagram of a heat pump type hot water supply device according to a first embodiment of the present invention.

2 is a control flowchart of an inverter drive type two-stage compressor during normal operation after completion of the initial setting operation according to the first embodiment of the present invention.

3 is a control flowchart of the opening degree of the electric expansion valve in the normal operation after completion of the initial setting operation according to the first embodiment of the present invention.

Fig. 4 is a flowchart of the operation frequency of the inverter drive type two-stage compressor and the opening degree control of the electric expansion valve in the normal operation after completion of the initial setting operation according to the second embodiment of the present invention.

Fig. 5 is a diagram showing an example of setting the operating frequency of the compressor with respect to the outside air temperature and the target heating completion temperature in the second embodiment of the present invention.

Fig. 6 is a diagram showing a setting example of the target discharge gas temperature of the compressor discharge gas with respect to the outside air temperature and the target heating completion temperature in the second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: refrigeration cycle unit

2: hot water supply unit

3: control device

11: inverter driven compressor

11a: low stage compressor

11b: high stage compressor

11c: compressor motor

12: high pressure side heat exchanger

13: motorized expansion valve

14: evaporator

21: water storage tank

22: hot water circulation pump

31: discharge gas temperature detector

32: outside temperature detector

33: heating complete temperature detector

Claims (9)

A refrigeration cycle device having a refrigerant circuit in which an inverter driven compressor, a high pressure side heat exchanger, a refrigerant expansion device, and an evaporator are connected in series; A hot water tank for storing hot water of water heated by the heat pump action of the refrigeration cycle device; And a control device that detects the outside air temperature at a predetermined time, controls the compressor capacity according to a predetermined criterion with respect to the detected change in the outside air temperature, and controls the opening degree of the electric expansion valve according to the predetermined criterion. Heat pump type hot water supply device. 2. The heat pump type hot water supply apparatus according to claim 1, wherein the control device detects an outside temperature every about 30 minutes. 3. The heat pump type hot water supply apparatus according to claim 1 or 2, wherein the control device controls the rotation speed of the inverter-driven compressor so that the compressor capacity is approximately a predetermined value with respect to the detected decrease in the outside air temperature. . 3. The heat pump type hot water supply apparatus according to claim 1 or 2, wherein the rotation speed of the inverter-driven compressor is controlled so that the compressor capacity becomes approximately constant with respect to the decrease in the outside air temperature. A refrigeration cycle device having a refrigerant circuit in which an inverter driven compressor, a high pressure side heat exchanger, a refrigerant expansion device, and an evaporator are connected in series; A boiling water tank for storing hot water for heating heated by the heat pump action of the refrigeration cycle device; The outside air temperature is detected at a predetermined time, and from the detected outside air temperature and the target heating completion temperature set for the outside air temperature, the operating frequency of the inverter-driven compressor and the opening degree of the electric expansion valve according to predetermined criteria. Heat pump type hot water supply device characterized in that it has a control device for controlling the. A refrigeration cycle device having a refrigerant circuit in which an inverter driven compressor, a high pressure side heat exchanger, a refrigerant expansion device, and an evaporator are connected in series; A water storage tank for storing hot water of water heated by a heat pump action of the refrigeration cycle device; The outside air temperature is detected at a predetermined time, and from the detected outside air temperature and the target heating completion temperature set for the hot water temperature and the predetermined amount of hot water used for water selected by the user, the inverter-driven compressor is And a control device for controlling an operating frequency and an opening degree of the electric expansion valve. 7. The heat pump type hot water supply apparatus according to claim 5 or 6, wherein the refrigeration cycle apparatus detects the outside temperature every about 30 minutes. The heat pump type hot water supply apparatus according to any one of claims 1, 2, 5, and 6, wherein the refrigeration cycle apparatus is a supercritical refrigeration cycle apparatus filled with carbon dioxide as a refrigerant. The compressor of any one of claims 1, 2, 5, and 6, wherein the inverter-driven compressor includes a low stage compressor and a high stage compressor in a hermetic housing, and the space in the hermetic housing is low stage. A heat pump type hot water supply device, characterized in that the inverter-driven two-stage compressor filled with the discharge gas of the compressor.