JP5537489B2 - Heat pump hot water supply air conditioner - Google Patents

Description

  The present invention performs cooling operation, heating operation, hot water supply operation, cooling hot water supply operation, heating hot water supply operation, and hot water supply operation by recovering exhaust heat during the cooling operation, using devices that play two roles of a heat pump air conditioner and a heat pump water heater. In addition, it is possible to improve the operating efficiency by changing the water circuit on the hot water supply side, adding a circuit that uses an outdoor heat exchanger that circulates with water or brine, and further, heat exchange inside multiple units. The present invention relates to a configuration of a refrigeration cycle circuit that enables a cooling / heating operation by a cooler.

  As a conventional heat pump hot water supply air conditioner, there is a configuration that can perform cooling operation, cooling hot water supply operation, and hot water supply operation as in Patent Document 1, but in this case, during the cooling hot water supply operation, it plays a role as a condenser. Since only the hot water supply side heat exchanger fulfills, it is necessary to limit the cooling capacity when the cooling load is large. On the contrary, when the cooling load is small, indoor comfort is secured by throwing away the cooling capacity to the outdoor heat exchanger.

  As a conventional heat pump hot water supply air conditioner capable of performing a cooling operation, a heating operation, a hot water supply operation, a cooling hot water supply operation, and a heating hot water supply operation, there is Patent Document 2, but at the time of heating hot water supply operation, a hot water supply side heat exchanger and an indoor side heat exchanger are provided. Are arranged in series, and the circulation rate of the feed water pump that supplies water to the hot water supply side heat exchanger is limited or the feed water pump is stopped in order to suppress a decrease in heating capacity in the indoor heat exchanger. The hot water supply capacity is reduced.

JP 2001-248937 A JP-A-2005-249319

  Here, in patent document 1, it does not respond | correspond in particular about the fluctuation | variation of the load by the temperature of the hot water supply side supply water rising, and in addition, heating operation cannot be performed as an air conditioner. Moreover, in patent document 2, since it is not the refrigeration cycle circuit which can collect | recover the waste heat at the time of air_conditionaing | cooling operation, not only the heat | fever of a refrigerant | coolant is discharge | released to air | atmosphere but is not utilized effectively, it becomes a factor of a heat island phenomenon. . Note that both the heat pump hot water supply air conditioners have one indoor heat exchanger, and a plurality of cooling and heating operations cannot be performed.

  Therefore, the present invention solves these problems and provides a heat pump hot water supply air conditioner that can perform cooling operation, heating operation, hot water supply operation, cooling hot water supply operation, heating hot water supply operation, and hot water supply operation by exhaust heat recovery during cooling operation. The purpose is to provide.

  In the present invention, the discharge pipe of the compressor 1 that compresses the refrigerant branches to the first four-way valve 6a, the second four-way valve 6b, and the hot water supply side heat exchanger 3, and the outdoor heat exchanger 2 is connected from the second four-way valve 6b. The hot water supply side heat exchanger 3 that is connected to the refrigerant amount regulator 4 via the outdoor electronic expansion valve 5a and heats the water supplied from the hot water storage tank 9 by the water supply pump 8 in parallel with the above components is connected to the hot water supply side electronic device. Connected to the refrigerant quantity regulator 4 via the expansion valve 5b, connected the indoor heat exchanger 10 from the first four-way valve 6a to the refrigerant quantity regulator 4 via the indoor electronic expansion valve 11, and the first four-way The compressor 1 has a refrigeration cycle circuit that sucks refrigerant through the valve 6a and the second four-way valve 6b. By switching between the first four-way valve 6a and the second four-way valve 6b, the cooling operation, the heating operation, the hot water supply operation, and the cooling are performed. Switch between hot water supply operation, heating hot water supply operation and exhaust heat recovery operation during cooling operation Rukoto is possible.

  According to the present invention, it is possible to perform a cooling operation, a heating operation, a hot water supply operation, a cooling hot water supply operation, a heating hot water supply operation, and a hot water supply operation by exhaust heat recovery during the cooling operation.

The refrigeration cycle system diagram of the heat pump hot water supply air conditioner by a present Example. The refrigeration cycle system diagram which shows the flow of the refrigerant | coolant at the time of air_conditionaing | cooling operation. The refrigeration cycle system diagram which shows the flow of the refrigerant | coolant at the time of heating operation. The refrigeration cycle system diagram which shows the flow of the refrigerant | coolant at the time of hot water supply driving | operation. The refrigeration cycle system diagram which shows the flow of the refrigerant | coolant at the time of air-conditioning hot-water supply driving | operation. The refrigeration cycle system diagram which shows the flow of the refrigerant | coolant at the time of heating hot-water supply driving | operation. The refrigeration cycle system diagram which shows the flow of the refrigerant | coolant in the hot water supply operation by the waste heat recovery at the time of air_conditionaing | cooling operation. The refrigeration cycle system diagram of Example 2. FIG. The refrigeration cycle system diagram of Example 3. FIG. The refrigeration cycle system diagram of Example 4. FIG. The refrigeration cycle system diagram of Example 5. FIG. The refrigeration cycle system diagram of Example 6. FIG. The refrigeration cycle system diagram of Example 7. FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the accompanying drawings.

  As shown in FIG. 1, the heat pump hot water supply air conditioner according to the first embodiment of the present invention is provided with a first four-way valve 6a, a second four-way valve 6b, and a hot water supply side heat exchanger 3 in parallel on the discharge side of the compressor 1, The indoor side heat exchanger 10 and the indoor side electronic expansion valve 11 are provided at the tip of the first four-way valve 6a, and the outdoor side heat exchanger 2 and the outdoor side electronic expansion valve 5a and the hot water supply side heat exchanger 3 are provided at the tip of the second four-way valve 6b. The hot water supply-side electronic expansion valve 5b is provided at the tip of the first and the refrigerant amount regulator 4 is provided at the place where the three directions meet. On the hot water supply side, the hot water supply side heat exchanger 3 and the hot water storage tank 9 are connected by a water pipe, a water supply pump 8 is provided on the primary side of the hot water supply side heat exchanger 3, and the hot water supply side heat exchanger 3 is heated. The hot water is sent to the hot water storage tank 9. Here, each operation is switched by switching the first four-way valve 6a and the second four-way valve 6b, and a check valve A7a and a check valve B7b are provided so that the refrigerant does not flow in an excessive place. ing. Hereinafter, each operation of the cooling operation, the heating operation, the hot water supply operation, the cooling hot water supply operation, the heating hot water supply operation, and the hot water supply operation by exhaust heat recovery during the cooling operation will be described.

  When performing the cooling operation, as shown in FIG. 2, the refrigerant is condensed by dissipating the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 through the second four-way valve 6b in the outdoor heat exchanger 2. And once stored in the refrigerant amount regulator 4. Thereafter, the refrigerant which has been adiabatically expanded by the indoor electronic expansion valve 11 and has become a low temperature and low pressure is evaporated by absorbing heat from the surrounding air in the indoor heat exchanger 10, and is used as a low temperature and low pressure gas refrigerant. The first four-way valve 6a and the second four-way valve 6b flow to the suction side of the compressor 1. At this time, the air cooled by the indoor heat exchanger 10 is cooled by blowing air with a fan.

  When performing the heating operation, as shown in FIG. 3, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is radiated to the surrounding air by the indoor heat exchanger 10 through the first four-way valve 6a. Then, the refrigerant is condensed and temporarily stored in the refrigerant quantity regulator 4. Thereafter, the refrigerant that has been adiabatically expanded by the outdoor electronic expansion valve 5a and has become a low-temperature and low-pressure is evaporated by absorbing the ambient heat in the outdoor heat exchanger 2 and is used as a low-temperature and low-pressure gas refrigerant. It flows to the suction side of the compressor 1 through the valve 6b and the first four-way valve 6a. At this time, the air heated by the indoor heat exchanger 10 is heated by blowing air with a fan.

  In the above cooling operation and heating operation, since the hot water supply side heat exchanger 3 is not used, the flow of the refrigerant is closed by the hot water supply side electronic expansion valve 5b.

  In the case of hot water supply operation, as shown in FIG. 4, the refrigerant is condensed by dissipating the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 to the water sent by the water supply pump 8 in the hot water supply side heat exchanger 3. And once stored in the refrigerant amount regulator 4. Thereafter, the refrigerant that has been adiabatically expanded by the outdoor electronic expansion valve 5a and has become a low-temperature and low-pressure is evaporated by absorbing the ambient heat in the outdoor heat exchanger 2 and is used as a low-temperature and low-pressure gas refrigerant. It flows to the suction side of the compressor 1 through the valve 6b. At this time, hot water heated by the hot water supply side heat exchanger 3 is stored in hot water by being sent to the hot water storage tank 9 by the water supply pump 8. Further, in the hot water supply operation, since the indoor heat exchanger 10 is not used, the refrigerant flow is closed by the indoor electronic expansion valve 11.

  In the case of the cooling hot water supply operation, as shown in FIG. 5, the high temperature and high pressure gas refrigerant discharged from the compressor 1 is dissipated to the water sent by the water supply pump 8 in the hot water supply side heat exchanger 3 to thereby release the refrigerant. Condensate and temporarily accumulate in the refrigerant amount regulator 4. After that, the refrigerant which has been adiabatically expanded by the indoor electronic expansion valve 11 and the outdoor electronic expansion valve 5a and has become a low temperature and low pressure is absorbed by the indoor heat exchanger 10 and the outdoor heat exchanger 2 with ambient heat. The low-temperature and low-pressure gas refrigerant flows to the suction side of the compressor 1 through the first four-way valve 6a and the second four-way valve 6b.

  The amount of refrigerant flowing through the indoor heat exchanger 10 and the outdoor heat exchanger 2 is controlled by the indoor electronic expansion valve 11 and the outdoor electronic expansion valve 5a according to the required cooling capacity and hot water supply capacity. Yes. At this time, the air cooled by the indoor heat exchanger 10 is blown by a fan, and the hot water heated by the hot water supply heat exchanger 3 is sent to the hot water storage tank 9 by the water supply pump 8 to store the hot water. doing.

  In the case of heating and hot water supply operation, as shown in FIG. 6, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is dissipated to the water sent by the water supply pump 8 in the hot water supply side heat exchanger 3 so that the refrigerant is discharged. The refrigerant is condensed by radiating heat with ambient air in the indoor heat exchanger 10 via the first four-way valve 6 a, condensed in the refrigerant amount regulator 4, and temporarily accumulated. Thereafter, the refrigerant that has been adiabatically expanded by the outdoor electronic expansion valve 5a and has become a low-temperature and low-pressure is evaporated by absorbing the ambient heat in the outdoor heat exchanger 2, and is used as a low-temperature and low-pressure gas refrigerant in the first four directions. The air flows to the suction side of the compressor 1 through the valve 6a and the second four-way valve 6b.

  The amount of refrigerant flowing through the indoor side heat exchanger 10 and the hot water supply side heat exchanger 3 is controlled by the indoor electronic expansion valve 11 and the hot water supply side electronic expansion valve 5b according to the required heating capacity and hot water supply capacity. ing. At this time, the air heated by the indoor heat exchanger 10 is heated by blowing with a fan, and the hot water heated by the hot water supply heat exchanger 3 is sent to the hot water storage tank 9 by the water supply pump 8 to store hot water. ing. The indoor side heat exchanger 10 and the hot water supply side heat exchanger 3 that become the refrigerant condensing side in these heating and hot water supply operations are arranged in parallel, and the refrigerant is formed by the indoor side electronic expansion valve 11 and the hot water supply side electronic expansion valve 5b, respectively. The amount can be controlled to ensure heating capacity and hot water supply capacity.

  In the case of hot water supply operation by exhaust heat recovery during cooling operation, as shown in FIG. 7, high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is sent from the hot water supply side heat exchanger 3 by the water supply pump 8. The refrigerant is condensed by radiating heat to the refrigerant amount regulator 4 and temporarily stored in the refrigerant quantity regulator 4. Thereafter, the refrigerant which has been adiabatically expanded by the indoor electronic expansion valve 11 and has become a low-temperature and low-pressure is evaporated by absorbing the ambient heat in the indoor-side heat exchanger 10 and is used as a low-temperature and low-pressure gas refrigerant. The air flows to the suction side of the compressor 1 through the valve 6a and the second four-way valve 6b.

  At this time, the air cooled by the indoor heat exchanger 10 is blown by a fan, and the hot water heated by the hot water supply heat exchanger 3 is sent to the hot water storage tank 9 by the water supply pump 8 to store the hot water. doing. When the required cooling capacity is large, that is, when the refrigerant cannot be completely condensed only by the hot water supply side heat exchanger 3, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is supplied to the second four-way valve 6b. The outdoor electronic expansion valve 5a is controlled so that the refrigerant flows through the outdoor heat exchanger 2 and is dissipated to condense the refrigerant.

  In this way, in the hot water supply operation by recovering exhaust heat during the cooling operation, the hot water supply operation is performed by flowing the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 to the hot water supply side heat exchanger 3 and circulating the water by the water supply pump 8. The cooling operation can be performed by evaporating the refrigerant condensed here in the indoor heat exchanger 10.

  Here, when the required cooling capacity is large, the refrigerant is flowed and condensed not only in the hot water supply-side electronic expansion valve 5b but also in the outdoor heat exchanger 2, thereby performing exhaust heat recovery without reducing the cooling capacity. Allows hot water operation. In addition, when the required cooling capacity is small and it is desired to secure the hot water supply capacity, the outdoor heat exchanger 2 in addition to the indoor heat exchanger 10 is connected to the refrigerant heat absorption side by switching the second four-way valve 6b. The same refrigeration cycle circuit as the cooling hot water supply operation is performed, and the heat absorption amount of the refrigerant can be assisted by the outdoor heat exchanger 2 so as to increase the hot water supply capacity. Thus, switching the second four-way valve 6b depending on the required cooling capacity and setting the outdoor heat exchanger 2 to the refrigerant condensation side or the heat absorption side is also effective in the above-described cooling hot water supply operation. .

  As described above, according to the first embodiment, the cooling operation, the heating operation, the hot water supply operation, the cooling hot water supply operation, the heating hot water supply operation, and the hot water supply operation by exhaust heat recovery during the cooling operation can be performed with a single refrigeration cycle configuration. A refrigeration cycle circuit can be obtained. By adopting this configuration, it is possible to design the device in a compact manner, and it is possible to suppress the heat island phenomenon by a hot water supply operation by exhaust heat recovery during cooling.

  In the refrigeration cycle circuit described in the above-described first embodiment, as shown in FIG. 8, in the case of using a circulation system using water or brine as the heat exchange medium of the outdoor heat exchanger 2, the hot water supply side heat exchange is performed. A bypass circuit for exchanging heat from the water supplied to the primary side of the heat exchanger 3 with the heat exchange medium on the secondary side of the outdoor heat exchanger 2, a regulating valve A13 on the outdoor side, and a regulating valve B14 on the hot water supply side. At the time of hot water supply, cooling hot water supply and heating hot water supply where the outdoor heat exchanger 2 becomes the refrigerant heat absorption side, the temperature of the supply water on the primary side of the hot water supply side heat exchanger 3 is lowered, and the secondary side of the outdoor heat exchanger 2 is The temperature of the heat exchange medium is raised to control the efficiency of warming the hot water.

  As described above, when the heat exchange medium of the outdoor heat exchanger 2 is water or brine, the supply water on the primary side of the hot water supply side heat exchanger 3 and the water or brine on the secondary side of the outdoor heat exchanger 2 are used. By providing a circuit for performing heat exchange, it is possible to suppress a decrease in efficiency due to a temperature increase in hot water supply water or a temperature decrease in outdoor water or brine.

  In the refrigeration cycle circuit described in the first embodiment, as shown in FIG. 9, a solenoid valve 16 is provided on the primary side of the hot water supply side heat exchanger 3, and a check valve C17 is provided on the secondary side. During the heating operation described above, it is possible to prevent wasteful heat dissipation of the refrigerant in the hot water supply side heat exchanger 3, and to flow all the high-temperature and high-pressure gas refrigerant to the indoor side heat exchanger 10.

  Thus, in the heating operation that does not use the hot water supply side heat exchanger 3, by shutting off an unnecessary refrigerant flow path connected to the hot water supply side heat exchanger 3, high-temperature and high-pressure gas refrigerant flows into the hot water supply side heat exchanger 3. It is possible to prevent heat dissipation and improve heating efficiency.

  In the refrigeration cycle circuit described in the first embodiment, as shown in FIG. 10, the hot water on the secondary side of the hot water supply side heat exchanger 3 is passed through the heat sink 19 for heat dissipation of the electrical components provided in the electrical component box 18. A circuit and a regulating valve C15 are newly provided, and in the hot water supply operation for heating hot water, the cooling hot water supply operation, and the heating hot water supply operation, the secondary side of the hot water supply side heat exchanger 3 is utilized by using heat generated from an electric product such as an inverter that is generally at a high temperature. The hot water is further heated, and the temperature in the electrical component box 18 is controlled to be lowered.

  In this way, by providing a circuit that uses heat generated from the electrical product, the temperature of the hot water heated by the hot water supply operation can be increased, and the temperature in the electrical product box can be kept low.

  In the refrigeration cycle circuit described in the first embodiment, the outdoor heat exchanger 2 is a circulation type using water or brine as the heat exchange medium of the outdoor heat exchanger 2 as shown in FIG. A bypass circuit for passing the secondary heat exchange medium in the heat sink 19 for heat dissipation of the electrical components provided in the electrical component box 18 and a regulating valve A13 are newly provided, and the outdoor heat exchanger 2 is provided on the refrigerant heat absorption side. During the heating operation, hot water supply operation, cooling hot water supply operation, and heating hot water supply operation, the heat generated from the electric components such as inverters, which are generally at high temperatures, is used to efficiently improve the temperature of the heat exchange medium on the secondary side of the outdoor heat exchanger 2 The temperature of the electrical component box 18 is controlled to be lowered.

  In this way, by providing a circuit that uses heat generated from the electrical product, the outdoor heat exchanger 2 on the refrigerant heat absorption side can be operated in an efficient state, and the temperature in the electrical product box is It can be kept low.

  In the refrigeration cycle circuit described in the first embodiment, as shown in FIG. 12, a bypass circuit and a regulating valve A13 for exchanging heat between the supply water on the primary side of the hot water supply side heat exchanger 3 and the outdoor heat exchanger 2 are provided. It is newly provided and is controlled so as to lower the temperature of the feed water on the primary side of the hot water supply side heat exchanger 3 to an efficient temperature.

  Thus, by lowering the temperature of the supply water on the primary side of the hot water supply side heat exchanger 3, it is possible to suppress a decrease in efficiency during the hot water supply operation due to a rise in temperature of the hot water supply side supply water.

  In the refrigeration cycle circuit described in the first embodiment, as shown in FIG. 13, a plurality of (for example, three) indoor heat exchangers 10a to 10c and indoor electronic expansion valves 11a to 11c are newly arranged in parallel. The cooling operation by a plurality of indoor heat exchangers is controlled by controlling the indoor electronic expansion valves 11a to 11c according to the required cooling and heating capacity of each of the places where the indoor heat exchangers 10a to 10c are installed. , Heating operation can be performed. Also in this case, similar to the first embodiment, the hot water supply operation by cooling heat supply operation, heating hot water supply operation, and exhaust heat recovery during the cooling operation can be performed.

  As described above, according to the embodiment, the heat pump hot water supply air conditioner capable of performing the cooling operation, the heating operation, the hot water supply operation, the cooling hot water supply operation, the heating hot water supply operation, and the hot water supply operation by exhaust heat recovery during the cooling operation in a single refrigeration cycle. Can be provided. Furthermore, regardless of the required cooling capacity, the cooling and hot water supply can be operated simultaneously, the hot water supply operation can be performed without restricting the hot water supply capacity, and the efficiency of each operation can be improved by various configurations. A possible refrigeration cycle circuit can be obtained.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Outdoor heat exchanger 3 Hot water supply side heat exchanger 4 Refrigerant amount regulator 5a Outdoor electronic expansion valve 5b Hot water supply side electronic expansion valve 6a First four-way valve 6b Second four-way valve 7a Check valve A
7b Check valve B
8 Water supply pump 9 Hot water storage tank
10 (ac) Indoor heat exchanger 11 (ac) Indoor electronic expansion valve 12 Circulating pump 13 Regulating valve A
14 Regulating valve B
15 Regulating valve C
16 Solenoid valve 17 Check valve C
18 Electrical box 19 Heat sink

Claims (8)

  The discharge pipe of the compressor 1 that compresses the refrigerant branches to the first four-way valve 6a, the second four-way valve 6b, and the hot water supply side heat exchanger 3, and the outdoor heat exchanger 2 is connected to the outdoor electronic device from the second four-way valve 6b. A hot water supply side heat exchanger 3 for heating water supplied from the hot water storage tank 9 by a water supply pump 8 in parallel with the above components is connected to the refrigerant quantity regulator 4 via an expansion valve 5a, and a hot water supply side electronic expansion valve 5b is connected. To the refrigerant quantity regulator 4, and the indoor side heat exchanger 10 is connected from the first four-way valve 6 a to the refrigerant quantity regulator 4 via the indoor electronic expansion valve 11, and the first four-way valve 6 a and the second The compressor 1 has a refrigeration cycle circuit in which the refrigerant 1 sucks refrigerant through the two-way valve 6b. By switching between the first four-way valve 6a and the second four-way valve 6b, cooling operation, heating operation, hot water supply operation, cooling hot water supply operation, heating Hot water supply operation by exhaust heat recovery during hot water operation and cooling operation Heat pump hot water supply air conditioner that can. In claim 1,
Water or brine is used as the heat exchange medium of the outdoor heat exchanger 2, and the heat exchange medium is heat-exchanged with the supply water on the hot water supply side heat exchanger 3 primary side by the circulation pump 12, so that the temperature of the supply water is changed. A heat pump hot water supply air conditioner that can lower the efficiency of hot water supply operation. In claim 1 or 2,
When the heat exchange medium of the outdoor heat exchanger 2 is a circulation type, the circulation pump 12 exchanges heat with the supply water on the primary side of the hot water supply side heat exchanger 3 so that the circulation medium of the outdoor heat exchanger 2 is changed. Heat pump hot water supply air conditioner that can raise the operating efficiency by raising the temperature. In claim 1,
A heat pump hot water supply air conditioner that can increase heating efficiency by providing a solenoid valve 16 on the primary side of the hot water supply side heat exchanger 3 and a check valve C17 on the secondary side. In claim 1,
By passing the supply water on the secondary side of the hot water supply side heat exchanger 3 through the heat sink 19 for exhaust heat provided in the electrical component box 18, the hot water temperature on the hot water supply side is raised, Heat pump hot water supply air conditioner that can lower the temperature. In claim 1,
When the circulation type using water or brine is used as the heat exchange medium of the outdoor heat exchanger 2, the heat exchange medium is passed through the heat sink 19 for exhaust heat provided in the electrical component box 18 by the circulation pump 12. Thus, a heat pump hot water supply air conditioner that can raise the operating efficiency by raising the temperature of the circulating medium and can lower the temperature in the electrical component box 18. In claim 1,
A heat pump hot water supply air conditioner that lowers the temperature of the supplied water and increases the efficiency during hot water supply operation by passing the supplied water on the primary side of the hot water supply side heat exchanger 3 through a part of the outdoor heat exchanger 2. In claim 1,
A heat pump that can perform cooling operation, heating operation, cooling hot water supply operation, and heating hot water supply operation by a plurality of indoor heat exchangers by providing a plurality of indoor heat exchangers 10 and indoor electronic expansion valves 11 in parallel. Hot water supply air conditioner.

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