JP2006017440A - Heat pump air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce electric power consumption, to recover cooling exhaust heat, and to improve heating capacity when outdoor temperature is low in an air conditioner carrying out cooling and heating. <P>SOLUTION: The heat pump air conditioner is provided with a compressor, an outdoor heat exchanger, an outdoor blower, an indoor heat exchanger, an indoor blower, a refrigerant-thermal storage medium heat exchanger, a thermal storage medium tank, and a thermal storage medium circulating pump. By arranging a control valve, a cooling-heating selector valve, a pressure reducing device, a check valve, or the like in a piping, and carrying out control of the control valve, the outdoor blower, the indoor blower, the cooling-heating selector valve, and the thermal storage medium circulating pump, cooling, heating, thermal storage to the thermal storage medium, fetching of heat from the thermal storage medium, thermal storage by the heating exhaust heat, or the like becomes possible, and the energy saving heat pump air conditioner capable of reinforcing heating capacity when outdoor temperature is low and supplying hot water to the outside becomes possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes both the field of air-cooled air conditioning equipment that performs cooling operation and heat pump heating, and the field of heat pump hot water supply equipment that supplies hot water using a heat pump.

  Conventional technologies include heat pump air conditioners, heat pump water heaters, and heating enhanced heat pump machines.

  The heat pump air conditioner is an air conditioning device for cooling and heating by switching a refrigerant circuit, and FIG. 2 shows a refrigerant system and main devices.

  The heat pump water heater is a device that takes the temperature of the hot water from the outdoor air and uses it for heating the hot water. FIG. 3 shows the refrigerant system and the main devices.

  The heating capacity enhancing heat pump is an air conditioning device that moves the heat of the boiler combined with a boiler or the like to the refrigerant and consequently increases the heating capacity. FIG. 4 shows a refrigerant system and main equipment. The heat storage medium going pipe 34 and the heat storage medium return pipe 35 in FIG. 4 indicate circulation pipes with the boiler.

  Air-conditioners for cooling and heating use large amounts of power, and thus affect the power supply of the whole country, so energy-saving equipment is required.

  In heat pump air conditioners, measures to reduce power consumption, measures to reduce heating capacity at low outside temperatures, and measures to blow out cold air during defrosting at low outside temperatures are issues.

  During cooling operation, the heat from the room and the input energy of the compressor are thrown away into the outside air by the outdoor heat exchanger, and nothing is used.

  In the heating operation, heat pump operation is performed, and heat is pumped up from the outside air by the outdoor heat exchanger. For this reason, when the outside air temperature is lowered, the amount of pumped heat is decreased, and thus the heating capacity may be insufficient.

  Further, when the outside air temperature is approximately 2 ° C. or less, frost is formed on the outdoor heat exchanger, so that the circulation of the outside air is hindered. At the same time, the frost becomes a thermal resistance, so that it is difficult to pump heat from the outside air. Therefore, it is necessary to melt the frost adhering to the outdoor heat exchanger. For this defrosting, switching from the heating operation, a temporary cooling operation was performed, and the frost was melted by the heat in the air-conditioned room. Since this takes heat from the air-conditioned room, the room temperature decreases, and there is a fact that the air-conditioning room is not comfortable.

  A heat pump water heater is a device that uses heat from outside air to increase the temperature of the hot water in a heat pump operation. Therefore, although the outside air is cooled in winter and summer, cold air cannot be used for cooling in summer.

  The heating capacity enhancing heat pump machine is connected to an apparatus having a heat source such as a boiler in addition to an air conditioner, and uses the heat for increasing the heating capacity. Although this equipment has increased heating capacity, when the outside air temperature is high and heating capacity augmentation operation is unnecessary, heat pump operation is performed to pump heat from the outside air, and the heat cannot be supplied to the boiler side.

  Another example of a heating capacity enhanced heat pump machine uses a gas engine to drive the compressor. This uses the engine coolant of the gas engine to increase the heating capacity of the air conditioner through the heat exchanger. In the case of this equipment, a part of the heat that is thrown away for cooling the engine is used to increase the heating capacity. However, even if an efficient heat pump operation is performed with this device, the engine must eventually be operated, and as a result, exhaust heat is generated again, so that it is not an energy saving device. Even if the same operation as the heat pump water heater is performed, it is impossible to supply heat pumped up from the outside air to the engine side.

  Further, in the case of cooling operation, both the exhaust heat for cooling the engine and the heat from the air-conditioning room must be discarded, which does not save energy.

  Moreover, it is not possible to make only hot water similar to a heat pump water heater without cooling operation and heating operation.

  Equipped with electric drive mechanical compression type refrigerant compressor, both equipped with outdoor heat exchanger, outdoor fan, indoor heat exchanger, indoor fan, refrigerant vs. heat storage medium heat exchanger, heat storage medium tank and heat storage medium circulation pump, Equipped with multiple control valves and cooling / heating switching valves for passing and blocking refrigerant flow, equipped with decompression device for reducing pressure and check valve for automatically closing the flow of refrigerant, combining these to make a refrigerant circulation cycle And form a heat storage medium circulation cycle. Of these, by controlling the compressor, outdoor blower, indoor blower, heat storage medium circulation pump, multiple control valves and cooling / heating switching valve, heat storage to the heat storage medium when cooling operation, heating operation, cooling and heating operation is not performed Operation, heating capacity increasing operation and defrosting operation in which heat is taken in from the heat storage medium, and heat storage operation of the cooling exhaust heat to the heat storage medium can be performed.

  A boiler can be connected to the heat storage medium tank so that heat from the outside can be applied, or an electric heater can be provided to increase the heating capacity at low outside temperatures.

  By installing a coiled heat exchanger inside the heat storage medium tank, or by installing a coil in close contact with the heat storage medium tank so that heat can be exchanged with the heat storage medium tank, tap water from outside can be heated. It can be used as hot water.

  According to the present invention, it is possible to perform a cooling operation as an air conditioner, and at the time of cooling, it is possible to collect exhaust heat in a heat storage medium tank and indirectly heat tap water or the like and use it as hot water. During this operation, since the cooling exhaust heat is used while cooling, the energy efficiency including both is considerably increased.

  Since the heating operation according to the present invention performs heat pump heating, the energy efficiency is high. However, in the conventional heat pump, the amount of heat that is pumped is substantially proportional to the decrease in the outside air temperature, so that the heating capacity may be insufficient. In addition, when the outside air becomes 2 degrees or less, frost is generated in the outdoor heat exchanger, which disturbs ventilation and heat transfer. Therefore, even during heating operation, temporary cooling operation must be performed and defrost operation must be performed. did not become. Defrosting operation is another factor that reduces the heating capacity.

  In the present invention, heat can be stored in a heat storage medium tank by a heat storage operation or an external boiler, and the heat can be used for heating operation or defrosting operation. Therefore, stable high heating capacity can be ensured regardless of the outside air temperature. .

  In the present invention, heat is stored in the heat storage medium tank in the summer by cooling exhaust heat, and in the winter the heat storage operation can be performed even when the heating reaches the specified temperature or when heating is unnecessary, so there is little supply of heat from the outside. It can be used as an energy-saving air conditioner.

  Since the present invention collects cooling exhaust heat and can use it for hot water supply, when cooling and hot water supply such as a kitchen are required at the same time, significant energy saving can be achieved.

  The compressor of the present invention uses an electrically driven mechanical compression type refrigerant compressor.

  The present invention is a device that performs cooling operation and heating operation by switching the refrigerant circuit. When necessary during heating operation, the heat stored in the heat storage medium is used to compensate for the lack of heating capacity at low outside temperature, and the outdoor heat exchanger When the heat of the heat storage medium is used for defrosting, and when cooling and heating are not performed, heat is taken from the outdoor air in the heat pump operation to increase the temperature of the heat storage medium, and during the cooling operation, the heat discharged to the outside of the heat storage medium It is possible to recover the cooling exhaust heat as the temperature rises.

  The refrigerant system, heat storage medium system, and main equipment of the present invention are shown in FIG. FIG. 1 shows an outdoor unit 50 in which a compressor, an outdoor heat exchanger, an outdoor fan, a refrigerant pair heat storage medium heat exchanger, and the like are housed in one housing, and an indoor unit in which an indoor heat exchanger and an indoor fan are housed in a single housing. In this example, the heat storage medium tank 52 and the heat storage medium circulation pump are housed in one housing.

  The indoor unit 51 allows the indoor air to pass through the plate fin tube type indoor heat exchanger 15 by rotating the indoor blower 17 with a motor, exchanges heat between the refrigerant and the air, cools and heats the passing air, and performs cooling and heating. To do.

  The equipment of the refrigerant system includes a compressor 1, a cooling / heating switching valve 2, a control valve 3, a control valve 4, an outdoor heat exchanger 5, a check valve 6, a pressure reducing device 7, a control valve 8, a control valve 9, a closing valve 10, Close valve 12, decompressor 13, check valve 14, indoor heat exchanger 15, close valve 16, close valve 18, gas-liquid separator 19, decompressor 20, check valve 21, refrigerant versus heat storage medium heat exchanger 22 The decompression device 23, the check valve 24, the control valve 25, the connection pipe 32 and the connection pipe 33.

  The heat storage medium is liquid such as water and antifreeze. The heat storage medium system is the refrigerant pair heat storage medium heat exchanger 22, the heat storage medium tank 26, the electric heater 27, the heat storage medium circulation pump 28, the heat storage medium going pipe 34, and the heat storage medium return pipe 35.

  There are eight types of operation of the apparatus of the present invention: cooling operation, cooling exhaust heat recovery operation, heating operation, heating capacity enhancement A operation, heating capacity enhancement S operation, defrosting A operation, defrosting B operation, and heat storage operation.

  The cooling operation is performed when the temperature of the heat storage medium tank 26 has risen to a specified level and heating is not necessary, and the room needs to be cooled. However, when it is not necessary to use the heat of the heat storage medium tank 26, the cooling operation can be performed only when the cooling is necessary.

  In the cooling operation, the refrigerant flows from the compressor 1 in FIG. 1 through the cooling / heating switching valve 2, the control valve 3, the outdoor heat exchanger 5, the check valve 6, the control valve 8, and the control valve. 9, closing valve 10, connecting pipe 32, closing valve 12, decompression device 13, indoor heat exchanger 15, closing valve 16, connecting pipe 33, closing valve 18, cooling / heating switching valve 2, gas-liquid separator 19, compressor 1 The flow goes through and becomes a refrigeration cycle. At this time, the control valve 25 and the control valve 4 are closed.

  The check valve 14 is automatically closed. The heat storage medium circulation pump 28 is stopped. The outdoor blower 11 is operated, and air is circulated through the outdoor heat exchanger 5 to exhaust heat from the room and heat input from the compressor. The indoor blower 17 circulates indoor air that is normally operated and air-conditioned, and performs cooling and dehumidification.

  The cooling exhaust heat recovery operation is performed when it is necessary to raise the temperature of the heat storage medium tank 26 at a temperature lower than the specified temperature, and the room needs to be cooled.

In the cooling / exhaust heat recovery operation, the refrigerant flows from the compressor 1 in FIG. 1 through the cooling / heating switching valve 2, the check valve 21, the refrigerant-to-heat storage medium heat exchanger 22, the check valve 24, Control valve 25, control valve 9, closing valve 10, connection pipe 32, closing valve 12, decompression device 13, indoor heat exchanger 15, closing valve 16, connection pipe 33, closing valve 18, cooling / heating switching valve 2, gas-liquid separation The refrigeration cycle is completed by making a round of flow with the compressor 19 and the compressor 1.
At this time, the control valve 3 and the control valve 8 are closed. The control valve 4 is in a passing state so that the refrigerant does not accumulate in the outdoor heat exchanger.

  The check valve 14 is automatically closed. The heat storage medium circulation pump 28 operates to circulate the heat storage medium between the refrigerant pair heat storage medium heat exchanger 22 and the heat storage medium tank 26. For this reason, the exhaust heat of cooling becomes the heat storage medium temperature rise of the heat storage medium tank 26, and can heat up the external tap water 30 etc. and can be used as warm water. In the cooling exhaust heat recovery operation, the outdoor blower 11 is stopped and the indoor blower 17 is operated to cool and dehumidify the indoor air.

  Heating operation is performed when the room needs to be heated.

  In the heating operation, the refrigerant flows from the compressor 1 in FIG. 1 through the cooling / heating switching valve 2, the closing valve 18, the connecting pipe 33, the closing valve 16, the indoor heat exchanger 15, and the check valve. 14, closing valve 12, connection pipe 32, closing valve 10, control valve 9, control valve 8, decompression device 7, outdoor heat exchanger 5, control valve 3, cooling / heating switching valve 2, gas-liquid separator 19, compressor 1 The refrigeration cycle is complete. At this time, the control valve 25 and the control valve 4 are closed.

  The heat storage medium circulation pump 28 is stopped. The outdoor blower 11 is normally operated, and the outdoor air is passed through the outdoor heat exchanger 5 to take in heat. The indoor blower 17 is normally operated and passes the indoor air through the indoor heat exchanger 15 to exchange heat between the refrigerant and the air, thereby raising the air temperature and heating.

  There are two types of heating capacity increasing operation, one is heating capacity increasing A operation when only the refrigerant pair heat storage medium heat exchanger 22 is used, and the other is the outdoor heat exchanger 5 and the refrigerant pair heat storage medium heat exchanger 22. It is heating capacity increase S operation when using these simultaneously.

  In the heating capacity enhancement A operation, the outdoor heat exchanger 5 is not used but only the refrigerant versus the heat storage medium heat exchanger 22 is used. The refrigerant flows from the compressor 1 in FIG. , The closing valve 18, the connecting pipe 33, the closing valve 16, the indoor heat exchanger 15, the check valve 14, the closing valve 12, the connecting pipe 32, the closing valve 10, the control valve 9, the control valve 25, the pressure reducing device 23, The refrigerant-to-heat storage medium heat exchanger 22, the pressure reducing device 20, the cooling / heating switching valve 2, the gas-liquid separator 19, and the compressor 1 flow into a refrigeration cycle. At this time, the control valve 8 and the control valve 4 are closed, and the control valve 3 is in a flow state.

  The outdoor blower 11 is stopped, the indoor blower 17 is normally operated, and the indoor air is passed through the indoor heat exchanger 15 to heat the air. The heat storage medium circulation pump 28 operates to circulate the heat storage medium between the refrigerant pair heat storage medium heat exchanger 22 and the heat storage medium tank 26, and uses the heat of the heat storage medium tank 26 for heating. This operation is used when there is sufficient heat accumulation in the heat storage medium tank 26 or when a sufficient heat source such as a boiler is prepared in the heat storage medium tank 26.

  Even if the outdoor air is low and the outdoor heat exchanger 5 alone cannot provide sufficient heating capacity, the heating capacity can be increased by using the heat stored in the heat storage medium tank 26.

  In the heating capacity-enhancing S operation, the outdoor heat exchanger 5 and the refrigerant-to-heat storage medium heat exchanger 22 are used at the same time. The refrigerant flows from the compressor 1 in FIG. , The closing valve 18, the connecting pipe 33, the closing valve 16, the indoor heat exchanger 15, the check valve 14, the closing valve 12, the connecting pipe 32, the closing valve 10, the control valve 9, and the refrigerant are divided into two. The control valve 8, the decompression device 7, the outdoor heat exchanger 5, and the control valve 3 reach the cooling / heating switching valve 2. The other of the divided refrigerants follows a path that passes through the control valve 25, the pressure reducing device 23, the refrigerant pair heat storage medium heat exchanger 22, the pressure reducing device 20, and reaches the cooling / heating switching valve 2. Enters the gas-liquid separator 19 from the cooling / heating switching valve 2 and reaches the compressor 1 to form a refrigeration cycle.

  The outdoor blower 11 and the indoor blower 17 are operated. The indoor blower 17 heats the air by passing the room air through the indoor heat exchanger 15. The heat storage medium circulation pump 28 operates to circulate the heat storage medium between the refrigerant pair heat storage medium heat exchanger 22 and the heat storage medium tank 26, and uses the heat of the heat storage medium tank 26 for heating. This operation is used when heat is accumulated in the heat storage medium tank 26 or when a heat source such as a boiler is prepared in the heat storage medium tank 26. The control valve 4 is closed.

  In order to use the outdoor heat exchanger 5 and the refrigerant-to-heat storage medium heat exchanger 22 at the same time, a decompression device 20 is installed to match the evaporation temperature with respect to the outside air temperature. In the absence of the decompression device 20, the heat storage medium temperature is considerably higher than the outside air temperature, and the evaporation temperature of the refrigerant becomes a high temperature corresponding to the temperature of the heat storage medium, so heat cannot be absorbed from the outdoor heat exchanger 5.

  There are two reasons for using the outdoor heat exchanger 5 and the refrigerant versus heat storage medium heat exchanger 22 at the same time. One is to use both heat exchangers at the same time, so that it is difficult for the outdoor heat exchanger 5 to form frost, and the other is that the heat in the heat storage medium tank 26 is a finite amount. This is because the amount of heat pumped up from the vessel 5 is increased to preserve the heat of the heat storage medium tank 26.

  In the defrosting operation, when the heating operation is performed at a low outside air temperature, the outdoor heat exchanger 5 is frosted. Therefore, the ventilation resistance is increased, and the heat transfer performance is reduced due to the heat resistance of the frost. In order to avoid being pumped up, melt the frost and let it flow. The defrosting operation includes a defrosting A operation in which a high-temperature refrigerant is supplied to the indoor heat exchanger 15 and a defrosting B operation in which the refrigerant is supplied to the refrigerant heat storage medium heat exchanger 22 and the heat is used.

  In the defrosting A operation, the refrigerant flows from the compressor 1 in FIG. 1 through the cooling / heating switching valve 2, the control valve 3, the outdoor heat exchanger 5, the check valve 6, and the control valve. 8, control valve 9, closing valve 10, connecting pipe 32, closing valve 12, decompression device 13, indoor heat exchanger 15, closing valve 16, connecting pipe 33, closing valve 18, cooling / heating switching valve 2, gas-liquid separator 19 Thus, the refrigeration cycle is completed with the compressor 1. At this time, the control valve 25 and the control valve 4 are closed. The check valve 14 is automatically closed.

  The heat storage medium circulation pump 28 may be operating or stopped. The outdoor blower 11 is in a stopped state, and the indoor blower 17 may be operated or stopped. In the defrosting A operation, since the heat from the room is used for defrosting, the room temperature decreases. However, when it is not desired to use the heat of the heat storage medium tank 26, the defrosting A operation is performed.

  In the defrosting B operation, the refrigerant flows from the compressor 1 in FIG. 1 through the cooling / heating switching valve 2, the control valve 4, the outdoor heat exchanger 5, the check valve 6, and the control valve. 8, the control valve 25, the decompression device 23, the refrigerant-to-heat storage medium heat exchanger 22, the decompression device 20, the cooling / heating switching valve 2 enters the gas-liquid separator 19, and reaches the compressor 1 to form a refrigeration cycle.

  The heat storage medium circulation pump 28 is operated, and the heat of the heat storage medium tank 26 is sent to the refrigerant-to-heat storage medium heat exchanger 22 for defrosting. The outdoor blower 11 is in a stopped state, and the indoor blower 17 may be operated or stopped. At this time, the control valve 3 and the control valve 9 are closed. The check valve 24 and the check valve 21 are automatically closed.

  In the defrosting B operation, since the refrigerant is supplied with very little heat into the room, the influence on the room temperature is small. When the indoor blower is operating, the room air is agitated to reduce the unevenness in the room temperature.

  The heat storage operation is an operation in which heat is stored in the heat storage medium tank 26 by a heat pump operation, and can be performed when neither the cooling operation nor the heating operation is performed. In the heat storage operation, the refrigerant flows from the compressor 1 in FIG. 1 through the cooling / heating switching valve 2, the check valve 21, the refrigerant-to-heat storage medium heat exchanger 22, the check valve 24, The control valve 25, the control valve 8, the pressure reducing device 7, the outdoor heat exchanger 5, the control valve 4, the cooling / heating switching valve 2 enters the gas-liquid separator 19 and reaches the compressor 1 to form a refrigeration cycle.

  The heat storage medium circulation pump 28 is operated, and the heat pumped up from the outdoor air by the outdoor heat exchanger 5 is stored in the heat storage medium tank 26 through the refrigerant-to-heat storage medium heat exchanger 22. The outdoor blower 11 is in an operating state, and the indoor blower 17 may be operated or stopped. At this time, the control valve 3 and the control valve 9 are closed. The check valve 6 is automatically closed.

  The heat storage operation can be performed when the heating operation is not performed, that is, when the air conditioner is not used and when the room temperature rises to a specified temperature after the heating operation. Therefore, it is possible to increase the temperature of the heat storage medium tank 26 in the heat storage operation, and to supplement and increase the shortage of heat with a boiler, an electric heater, etc., and to save energy.

  Although FIG. 1 is divided into three bodies, that is, an outdoor unit 50, an indoor unit 51, and a heat storage medium unit 52, these can be integrated and can be one body or two bodies.

  Although the decompression devices 7, 13, 20, and 23 are shown as thin tubes in FIG. 1, they can be replaced with electric expansion valves. In that case, it is also possible to replace it with an electric expansion valve including a narrow tube, a check valve and a control valve.

  Table 1 shows Nos. In FIG. 1 of the main pressure reducing device that divides the operation of the cooling / heating switching valve, the outdoor blower, the indoor blower, each control valve, and the heat storage medium circulation pump from the high pressure and the low pressure in the eight types of operation of the present invention. Table 1 shows a case where the compressor 1 is in a steady operation, and is not in a state where the compressor is stopped, in the middle of starting or in the middle of stopping.

Note: Indicates that refrigerant can pass through.
Closed: Indicates that the refrigerant cannot pass.
(Run), (Stop): Indicates that run or stop is not an absolute condition.

  Since the present invention has features such as cooling, heating, hot water supply, or heating capacity enhancement, when cooling is mainly used in warm regions and hot water is required, or when a long cooling period such as a kitchen uses a large amount of hot water and a cooling period The use value is high because it is possible to use it in areas where the heat pump is not available or can not be used, such as when heating capacity augmentation operation is used in areas where the outside air temperature during the heating period is low and the temperature is low. .

  Depending on the selection of the size of the heat storage medium tank, the presence or absence of an external heat source such as a boiler, and the connection of tap water, the outdoor unit and the indoor unit can be dealt with by using the same one.

  Moreover, since it is an energy-saving device because it can perform exhaust heat recovery, heat pump heat storage, etc., the applicability is very high.

It is drawing which showed the main components of the heat pump air conditioner by this invention, a refrigerant | coolant system | strain, and a thermal storage medium system | strain. It is drawing which showed the main components and refrigerant | coolant system | strain of the conventional heat pump air conditioner. It is drawing which showed the main components and refrigerant | coolant system | strain of the conventional heat pump water heater. It is the figure which showed the main components and refrigerant | coolant system | strain of the conventional heating capacity augmentation heat pump air conditioner.

Explanation of symbols

1 Compressor 2 Cooling / heating switching valve (solid line indicates cooling, broken line indicates heating flow)
3 Control valve 4 Control valve 5 Outdoor heat exchanger (refrigerant to air)
6 Check valve 7 Pressure reducing device 8 Control valve 9 Control valve 10 Closing valve 11 Outdoor blower (M indicates motor)
12 Closing valve 13 Pressure reducing device 14 Check valve 15 Indoor heat exchanger (refrigerant to air)
16 Shut-off valve 17 Indoor blower (M indicates motor)
18 Shutdown valve 19 Gas-liquid separator 20 Pressure reducing device 21 Check valve 22 Refrigerant pair heat storage medium heat exchanger 23 Pressure reducing device 24 Check valve 25 Control valve 26 Heat storage medium tank 27 Electric heater 28 Heat storage medium circulation pump 29 Hot water valve 30 Water supply Water 31 Electric wiring for electric heater 32 Connection pipe 33 Connection pipe 34 Heat storage medium pipe 35 Heat storage medium return pipe 36 Hot water tank 50 Outdoor unit 51 Indoor unit 52 Heat storage medium unit

Claims (3)

Equipped with electric drive mechanical compression type refrigerant compressor, both equipped with outdoor heat exchanger, outdoor fan, indoor heat exchanger, indoor fan, refrigerant vs. heat storage medium heat exchanger, heat storage medium tank and heat storage medium circulation pump, Equipped with multiple control valves and cooling / heating switching valves for passing and blocking the refrigerant flow, as well as a pressure reducing device for reducing pressure and a check valve for automatically closing the flow of refrigerant, combining these to circulate the refrigerant Cycle and heat storage medium circulation cycle, and by controlling the compressor, outdoor blower, indoor blower, heat storage medium circulation pump, multiple control valves and cooling / heating switching valve, cooling operation and heating operation are performed, and cooling operation and heating are performed. When not in operation, heat is stored by heat pump operation to the heat storage medium, and when necessary, heat is taken into the refrigerant from the heat storage medium, and the heat is supplied to the heating operation and It possible to use the defrosting operation, and an operating method exhaust heat can heat storage to heat storage medium heat pump air conditioner during the cooling operation. A heat storage medium tank according to claim 1, wherein a boiler can be connected so that heat can be applied from the outside, or an electric heater is provided. The heat storage medium tank according to claim 1, wherein a heat exchanger is adhered inside or outside the heat storage medium tank so that water from the outside can be heated.

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