Air-conditioning system

Abstract

To provide an air-conditioning system which can switch an operation method when air-conditioning is performed.SOLUTION: An air-conditioning system 1A comprises a heat storage tank 15, a temperature sensor 232 and an air conditioner 161. The heat storage tank 15 stores a first heat medium 30. The temperature sensor 232 detects a first heat medium temperature being a temperature of the first heat medium 30 which is stored in the heat storage tank 15. The air conditioner 161 can perform a heating operation by using heat derived from the first heat medium 30 which is stored in the heat storage tank 15. When the air conditioner 161 performs a heating operation, methods of the plurality of heating operations can be switched according to the temperature of the first heat medium 30 which is detected by the temperature sensor 232, and stored in the heat storage tank 15.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an air conditioning system for conditioning an air-conditioned room. [Background technology]

[0002] Conventionally, air conditioning systems that condition air-conditioned rooms are known. For example, the air conditioning system described in Patent Document 1 includes a solar heat collecting means and an air conditioner. The solar heat collecting means includes a solar collector including a solar heat collecting panel that collects solar radiation, and a hot water tank. Heat obtained by the solar heat collecting panel is collected in the hot water tank via a pipe. The heat collected by the solar heat collecting means is transferred to a coil of the air conditioner via the hot water tank and a heat exchanger. The air in the room is heated by the air conditioner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-126422 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above air conditioning system, the only operating method for the air conditioner is to transfer heat from the hot water tank to the coil of the air conditioner via a heat exchanger, which means that the operating method of the air conditioner cannot be changed, and it is difficult to say that the heat stored in the hot water tank is being used efficiently.

[0005] An object of the present invention is to provide an air conditioning system capable of switching the operation mode when air conditioning is performed. [Means for solving the problem]

[0006] The air conditioning system according to the present invention includes a storage section for storing a first heat medium, a first temperature detection section for detecting a first heat medium temperature, which is the temperature of the first heat medium stored in the storage section, an air conditioning section capable of performing a heating operation using at least heat derived from the first heat medium and adjusting the temperature in an air-conditioned room, and a heating operation switching means for switching between a plurality of heating operation modes according to the first heat medium temperature detected by the first temperature detection section when the air conditioning section performs a heating operation. In this case, the air conditioning system can switch between a plurality of heating operation modes according to the first heat medium temperature. Therefore, the heat stored in the storage section can be used more efficiently than when the heating operation mode cannot be switched.

[0007] The air conditioning system includes a heat pump unit that performs heat exchange by a heat pump method, and the heating operation switching means includes a first heating operation means for supplying heat derived from a first liquid to the air conditioning unit through a path different from the path through which the heat pump unit is located when the first heat medium temperature detected by the first temperature detection unit is higher than a first temperature, and performing a first heating operation in the air conditioning unit, and a second heating operation means for heating a second liquid in the heat pump unit using the heat derived from the first liquid when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the first temperature, and performing a second heating operation using the second liquid as a heat source in the air conditioning unit, wherein the first liquid is the first heat medium itself or a liquid heated by the first heat medium in the storage unit, and the second liquid may be a liquid between the heat pump unit and the air conditioning unit.

[0008] In this case, when the first heat medium temperature is higher than the first temperature, the first heating operation is executed. As a result, the heat derived from the first liquid is supplied to the air conditioning unit through a path different from the path in which the heat pump unit is present, and is used as a heat source for heating in the air conditioning unit. As a result, the power consumption of the air conditioning system is reduced and the efficiency is improved compared to when the heat pump unit is used for heating. When the first heat medium temperature drops to the first temperature or lower due to the heat extraction from the first liquid by the air conditioning unit, the first heating operation is switched to the second heating operation. As a result, the operation is switched to the second heating operation, which is a heating operation in which the heat pump unit is used, and the second liquid is heated in the heat pump unit using the heat derived from the first liquid, and heating is performed in the air conditioning unit using the second liquid as a heat source. Therefore, the temperature of the heat medium (i.e., the second liquid) sent to the air conditioning unit is higher than when the heat pump unit is not used. Therefore, the heat of the first heat medium can be used for the heating operation until the first heat medium temperature of the first heat medium stored in the storage unit becomes lower than when the heat pump unit is not used. Therefore, the heat of the first heat medium stored in the storage portion can be used more efficiently.

[0009] In the air conditioning system, the first heating operation means may send the first liquid from the storage unit to the air conditioning unit when the first heat medium temperature detected by the first temperature detection unit is higher than the first temperature, and perform the first heating operation using the first liquid as a heat source in the air conditioning unit, and the second heating operation means may send the first liquid from the storage unit to the heat pump unit when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the first temperature, and may perform the second heating operation using the second liquid as a heat source in the air conditioning unit by exchanging heat between the first liquid and the second liquid in the heat pump unit. In this case, in the first heating operation, the first liquid is sent directly from the storage unit to the air conditioning unit to heat the air conditioned room. As a result, heat derived from the first heat medium is used to perform heating. When the second heating operation is performed, heat derived from the first heat medium is supplied to the air conditioning unit via the heat pump unit to heat the air conditioned room. Therefore, for example, the cost of the air conditioning system can be reduced compared to when both a heat exchange unit and a heat pump unit are provided. Also, in the first heating operation, the first liquid is directly supplied to the air conditioning unit to perform air conditioning. Therefore, compared to when a heat exchange unit is provided between the storage unit and the air conditioning unit, thermal energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved. Also, in the second heating operation, the first liquid is directly supplied to the heat pump unit to perform heat exchange. Therefore, compared to when a heat exchange unit is provided between the storage unit and the heat pump unit, thermal energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved.

[0010] The air conditioning system may include a first heat exchange unit that extracts heat from the first liquid by heat exchange, and the first heating operation means, when the first heat medium temperature detected by the first temperature detection unit is higher than the first temperature, performs heat exchange between the first liquid and a fifth liquid in the first heat exchange unit to heat the fifth liquid, and performs the first heating operation in the air conditioning unit using the fifth liquid as a heat source, and the second heating operation means, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the first temperature, performs heat exchange between the first liquid and a sixth liquid in the first heat exchange unit to heat the sixth liquid, performs heat exchange between the sixth liquid and the second liquid in the heat pump unit to heat the second liquid, and performs the second heating operation in the air conditioning unit using the second liquid as a heat source, and the fifth liquid is a liquid between the first heat exchange unit and the air conditioning unit, and the sixth liquid is a liquid between the first heat exchange unit and the heat pump unit. In this case, when the first heating operation is performed, heat derived from the first heat medium is supplied to the air conditioning unit via the first heat exchange unit, and the air-conditioned room is heated. When the second heating operation is performed, heat derived from the first heat medium is supplied to the air conditioning unit via the first heat exchange unit and the heat pump unit, and the air-conditioned room is heated. Since the first heat exchange unit is provided, the first liquid is not directly supplied to the heat pump unit. Therefore, for example, even if the first liquid contains impurities, the possibility that the heat pump unit will break down due to the influence of the impurities can be reduced.

[0011] In the air conditioning system, the second heating operation means performs the second heating operation when the first heat medium temperature detected by the first temperature detection unit is higher than a second temperature lower than the first temperature and is equal to or lower than the first temperature, and the heating operation switching means includes third heating operation means that uses heat derived from the second heat medium to heat the second liquid in the heat pump unit and performs a third heating operation using the second liquid as a heat source in the air conditioning unit when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, and the second heat medium may be a medium that undergoes heat exchange with geothermal heat or well water.

[0012] In this case, when the first heat medium temperature is higher than the second temperature and equal to or lower than the first temperature, the first liquid is sent from the storage unit to the heat pump unit, and the second heating operation is performed using the heat pump unit. When the first heat medium temperature of the first heat medium stored in the storage unit drops due to the heat pump unit collecting heat from the first liquid, and becomes equal to or lower than the second temperature, the second heating operation is switched to the third heating operation. This switches to a heating operation in which the second heat medium is used as a heat source, and heat is no longer collected from the first heat medium stored in the storage unit. This reduces the possibility that the temperature of the first heat medium drops too much and it cannot be used for heating. On the other hand, since the second heat medium is a medium that exchanges heat with geothermal heat or well water, its temperature does not change easily. This allows heating by the air conditioning unit to continue. In addition, the power consumption of the air conditioning system is reduced and efficiency is improved compared to a case in which the heat pump unit collects heat despite the first heat medium temperature being too low, and the power consumption of the heat pump unit is increased.

[0013] The air conditioning system may include a second temperature detector that detects a second heat medium temperature, which is the temperature of the second heat medium, and an indoor temperature detector that detects an indoor temperature of the air-conditioned room, and may include a cooling operation switching means that switches among a plurality of cooling operation modes according to a temperature difference between the indoor temperature and the second heat medium temperature when the indoor temperature detected by the indoor temperature detector is higher than the second heat medium temperature detected by the second temperature detector. In this case, the plurality of cooling operation modes can be switched according to the temperature difference between the indoor temperature and the second heat medium temperature. Therefore, the power consumption of the air conditioning system is reduced and the efficiency is improved compared to a case in which the cooling operation mode cannot be switched despite the thermal load of the air-conditioned room fluctuating.

[0014] In the air conditioning system, the cooling operation switching means may include a first cooling operation means for supplying cold heat derived from the second heat medium to the air conditioning unit through a path different from the path through which the heat pump unit is located, and performing a first cooling operation in the air conditioning unit, when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and when the temperature difference between the indoor temperature and the second heat medium temperature is greater than a predetermined temperature difference, and a second cooling operation means for cooling the second liquid in the heat pump unit using the cold heat derived from the second heat medium, and performing a second cooling operation in the air conditioning unit using the second liquid as a heat source, when the temperature difference between the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and when the temperature difference between the indoor temperature and the second heat medium temperature is equal to or less than the predetermined temperature difference.

[0015] In this case, when the temperature difference between the room temperature and the second heat medium temperature is larger than a predetermined temperature difference, the cold energy derived from the second heat medium is supplied to the air conditioning unit through a path different from the path through which the heat pump unit is present, and is used as a heat source for cooling in the air conditioning unit. This reduces the power consumption of the air conditioning system and improves efficiency compared to when the heat pump unit is used for cooling. When the room temperature changes or the temperature of the second heat medium changes due to the season or the like, and the temperature difference becomes equal to or smaller than a predetermined temperature difference, the first cooling operation is switched to the second cooling operation. This switches to cooling operation using the heat pump unit. Therefore, the temperature of the heat medium (i.e., the second liquid) sent to the air conditioning unit is lower than when the heat pump unit is not used. Therefore, when the temperature difference is equal to or smaller than the predetermined temperature difference, the air conditioning unit can cool the air-conditioned room more easily than when the heat pump unit is not used.

[0016] The air conditioning system may include an indoor temperature setting unit that sets an indoor set temperature, which is a target temperature of the room temperature of the air-conditioned room in the operation of the air conditioning unit, and an outdoor air temperature detection unit that detects an outdoor air temperature, and may include a ventilation unit that ventilates the air-conditioned room when the outdoor air temperature detected by the outdoor air temperature detection unit is lower than the indoor set temperature set by the indoor temperature setting unit, or is higher than the indoor set temperature and lower than the indoor temperature when the first air-conditioning operation by the first air-conditioning operation means or the second air-conditioning operation by the second air-conditioning operation means is performed. In this case, since the air-conditioned room is ventilated when the air-conditioning unit performs the air-conditioning operation, the temperature of the air-conditioned room drops faster than when ventilation is not performed. Therefore, the power consumption of the air-conditioning system is reduced and the efficiency is improved compared to when only the first air-conditioning operation or only the second air-conditioning operation is performed and ventilation of the air-conditioned room is not performed.

[0017] The air conditioning system may include a heating unit that heats the first heat medium stored in the storage unit, and a heating control unit that heats the first heat medium by the heating unit, and the heating operation switching unit may include a first switching unit that switches to the first heating operation by the first heating operation unit when the first heat medium is heated by the heating control unit and the first heat medium temperature detected by the first temperature detection unit becomes equal to or higher than a third temperature higher than the first temperature while the second heating operation is being performed by the second heating operation unit. In this case, the first heat medium is heated by the heating unit and then switched to the first heating operation that does not use a heat pump unit, so that the first heating operation can be performed for a longer period of time than when a heating unit is not provided. In addition, the power consumption of the air conditioning system is reduced and efficiency is improved because the second heating operation that uses a heat pump unit is switched to the first heating operation that does not use a heat pump unit.

[0018] In the air conditioning system, the heating operation switching means may include a second switching means for switching to the second heating operation by the second heating operation means when the first heat medium is heated by the heating control means and the first heat medium temperature detected by the first temperature detection unit becomes equal to or higher than a fourth temperature higher than the second temperature while the third heating operation is being performed by the third heating operation means. In this case, the third heating operation is switched to the second heating operation after the first heat medium is heated by the heating unit, so that the second heating operation can be performed for a longer period of time than when the heating unit is not provided. Also, the third heating operation using the second heat medium is switched to the second heating operation using the first heat medium. Since the first heat medium heated by the heating unit in the second heating operation is used as a heat source, the power consumption of the air conditioning system during heating is reduced and the efficiency is improved compared to when the unheated second heat medium is used as a heat source.

[0019] The air conditioning system includes a second heat exchanger that extracts heat from the second heat medium by heat exchange, and the third heating operation means, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, performs heat exchange between the second heat medium and a third liquid in the second heat exchanger to heat the third liquid, performs heat exchange between the third liquid and the second liquid in the heat pump unit to heat the second liquid, and performs the third heating operation using the second liquid as a heat source in the air conditioning unit, and the third liquid may be a liquid between the second heat exchanger and the heat pump unit. In this case, when the third heating operation is performed, heat derived from the second heat medium is supplied to the air conditioning unit via the second heat exchanger and the heat pump unit to heat the air-conditioned room. Since the second heat exchanger is provided, the second heat medium is not directly supplied to the heat pump unit. For this reason, for example, even if the second heat medium contains impurities, the possibility that the heat pump unit will break down due to the influence of the impurities can be reduced.

[0020] In the air conditioning system, when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit and the temperature difference between the indoor temperature and the second heat medium temperature is larger than the predetermined temperature difference, the first cooling operation means cools the fourth liquid by heat exchange between the second heat medium and a fourth liquid in the second heat exchange unit, and performs the first cooling operation in the air conditioning unit using the fourth liquid as a heat source, and the second cooling operation means cools the fourth liquid by heat exchange between the indoor temperature detected by the indoor temperature detection unit and the fourth liquid in the second heat exchange unit. In a state where the temperature is higher than the second heat medium temperature detected by the second temperature detection unit, when the temperature difference between the indoor temperature and the second heat medium temperature is equal to or less than the predetermined temperature difference, the second heat exchange unit exchanges heat between the second heat medium and the third liquid to cool the third liquid, the heat pump unit exchanges heat between the third liquid and the second liquid to cool the second liquid, and the air conditioning unit performs the second cooling operation using the second liquid as a heat source, and the fourth liquid may be a liquid between the second heat exchange unit and the air conditioning unit. In this case, in the first cooling operation, cold heat derived from the second heat medium is supplied to the air conditioning unit via the second heat exchange unit to cool the air-conditioned room. In the second cooling operation, cold heat derived from the second heat medium is supplied to the air conditioning unit via the second heat exchange unit and the heat pump unit to cool the air-conditioned room. Since the second heat exchange unit is provided, the second heat medium is not directly supplied to the heat pump unit when the first cooling operation and the second cooling operation are performed. Therefore, for example, even if the second heat medium contains impurities, the possibility that the heat pump unit will break down due to the influence of the impurities can be reduced.

[0021] The air conditioning system includes a water supply unit provided in the air-conditioned room and supplying water to the air-conditioned room, and a water supply control means for supplying the second heat medium to the water supply unit, and the second heat medium may be well water. In this case, water can be supplied to the air-conditioned room.

[0022] The air conditioning system may include a geothermal heat exchange unit that exchanges heat between the geothermal heat and the medium, and the second heat medium is the medium that is heat exchanged with the geothermal heat. When the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, the third heating operation means may perform heat exchange between the geothermal heat and the second heat medium in the geothermal heat exchange unit to heat the second heat medium, and perform heat exchange between the second heat medium and the second liquid in the heat pump unit to heat the second liquid, and perform the third heating operation using the second liquid as a heat source in the air conditioning unit.

[0023] In this case, when the third heating operation is performed, the heat derived from the second heat medium is supplied to the air conditioning unit via the heat pump unit to heat the air-conditioned room. Therefore, the cost of the air conditioning system can be reduced compared to when, for example, both a heat exchange unit and a heat pump unit are provided. In addition, the second heat medium is directly supplied to the heat pump unit and heat exchanged. Therefore, compared to when a heat exchange unit is provided between the geothermal heat exchange unit and the heat pump unit, thermal energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved.

[0024] In the air conditioning system, when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and the temperature difference between the indoor temperature and the second heat medium temperature is greater than the predetermined temperature difference, the first cooling operation means cools the second heat medium by exchanging heat between the geothermal heat and the second heat medium in the geothermal heat exchange unit, and performs the first cooling operation using the second heat medium as a heat source in the air conditioning unit. The second cooling operation means cools the second heat medium by exchanging heat between the geothermal heat and the second heat medium in the geothermal heat exchange unit, and cools the second liquid by exchanging heat between the second heat medium and the second liquid in the heat pump unit, and performs the second cooling operation using the second liquid as a heat source in the air conditioning unit, when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and the temperature difference between the indoor temperature and the second heat medium temperature is equal to or less than the predetermined temperature difference.

[0025] In this case, in the first cooling operation, the cold heat derived from the second heat medium is directly supplied to the air conditioning unit to cool the air-conditioned room. In the second cooling operation, the cold heat derived from the second heat medium is supplied to the air conditioning unit via the heat pump unit to cool the air-conditioned room. Therefore, for example, the cost of the air conditioning system can be reduced compared to when both the heat exchange unit and the heat pump unit are provided. In addition, in the first cooling operation, the second heat medium is directly supplied to the air conditioning unit to perform air conditioning. Therefore, compared to when a heat exchange unit is provided between the geothermal heat exchange unit and the air conditioning unit, thermal energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved. In addition, in the second cooling operation, the second heat medium is directly supplied to the heat pump unit to exchange heat. Therefore, compared to when a heat exchange unit is provided between the geothermal heat exchange unit and the heat pump unit, thermal energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved.

[0026] In the air conditioning system, the second heat medium is well water, and the third heating operation means may perform, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, heat exchange between the second heat medium and the second liquid in the heat pump unit to heat the second liquid, and perform the third heating operation using the second liquid as a heat source in the air conditioning unit. In this case, when the third heating operation is performed, heat derived from the well water, which is the second heat medium, is supplied to the air conditioning unit via the heat pump unit to heat the air-conditioned room. For this reason, the cost of the air conditioning system can be reduced compared to, for example, a case in which both a heat exchange unit and a heat pump unit are provided. In addition, the second heat medium is directly supplied to the heat pump unit and heat exchanged. For this reason, compared to a case in which a heat exchange unit is provided between a well, which is a supply source of well water, and the heat pump unit, thermal energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved.

[0027] In the air conditioning system, the first cooling operation means may perform the first cooling operation in the air conditioning unit using the second heat medium as a heat source when the temperature difference between the indoor temperature and the second heat medium temperature is greater than the predetermined temperature difference in a state where the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and the second cooling operation means may cool the second liquid by heat exchange between the second heat medium and the second liquid in the heat pump unit and perform the second cooling operation using the second liquid as a heat source in the air conditioning unit when the temperature difference between the indoor temperature and the second heat medium temperature is greater than the predetermined temperature difference in a state where the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit.

[0028] In this case, in the first cooling operation, the cold energy of the well water, which is the second heat medium, is directly supplied to the air conditioning unit to cool the air-conditioned room. In the second cooling operation, the cold energy derived from the well water, which is the second heat medium, is supplied to the air conditioning unit via the heat pump unit to cool the air-conditioned room. Therefore, the cost of the air-conditioning system can be reduced compared to when both a heat exchange unit and a heat pump unit are provided. In addition, in the first cooling operation, the second heat medium is directly supplied to the air conditioning unit to perform air conditioning. Therefore, compared to when a heat exchange unit is provided between the well, which is the supply source of the well water, and the air conditioning unit, heat energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved. In addition, in the second cooling operation, the second heat medium is directly supplied to the heat pump unit and heat exchanged. Therefore, compared to when a heat exchange unit is provided between the well, which is the supply source of the well water, and the heat pump unit, heat energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to the air conditioning unit is improved.

[0029] The air conditioning system may include a water supply unit provided in the air-conditioned room and supplying water to the air-conditioned room, and a water supply control unit that supplies the second heat medium to the water supply unit. In this case, water can be supplied to the air-conditioned room. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a diagram showing a configuration of an air conditioning system 1A. [Diagram 2] FIG. 2 is a diagram showing the electrical configuration of an air conditioning system 1A. [Diagram 3] FIG. 1 is a diagram showing an air conditioning system 1A that executes an operation pattern A for collecting solar heat. [Figure 4] FIG. 1 is a diagram showing an air conditioning system 1A that executes a heating operation pattern B. [Diagram 5] FIG. 1 is a diagram showing an air conditioning system 1A that executes a heating operation pattern C. [Figure 6] FIG. 1 is a diagram showing an air conditioning system 1A that executes a heating operation pattern D. [Figure 7] FIG. 1 is a diagram showing an air conditioning system 1A that executes a cooling operation pattern F. [Figure 8] FIG. 1 is a diagram showing an air conditioning system 1A that executes a cooling operation pattern G. [Figure 9] FIG. 1 is a diagram showing an air conditioning system 1A that executes an operation pattern H of water supply. [Figure 10] 1 is a flowchart of a solar heat collection process. [Figure 11] 4 is a flowchart of an operation switching process. [Figure 12] 12 is a continuation of the flowchart in FIG. 11. [Figure 13] This is a continuation of the flowchart in FIG. 12. [Figure 14] 12 is another flowchart continuing from FIG. 11. [Figure 15] This is a continuation of the flowchart in Figure 14. [Figure 16] FIG. 1 is a diagram showing the configuration of an air conditioning system 1B according to a modified example, and shows the air conditioning system 1B executing an operation pattern A and an operation pattern B. [Figure 17] FIG. 13 is a diagram showing the configuration of an air conditioning system 1C according to a modified example, and shows an air conditioning system 1C that executes an operation pattern F. [Figure 18] FIG. 13 is a diagram showing the configuration of an air conditioning system 1D according to a modified example, and shows an air conditioning system 1D that executes a cooling operation pattern F. [Figure 19] FIG. 1 is a diagram showing an air conditioning system 1D that executes a heating operation pattern D or a cooling operation pattern G. [Figure 20] FIG. 13 is a diagram showing the configuration of an air conditioning system 1E according to a modified example, and shows the air conditioning system 1E executing a cooling operation pattern F. [Figure 21] FIG. 1 is a diagram showing an air conditioning system 1E that executes a heating operation pattern D or a cooling operation pattern G. [Figure 22] FIG. 13 is a diagram showing the configuration of an air conditioning system 1F according to a modified example, and shows the air conditioning system 1F executing a heating operation pattern B. [Diagram 23] FIG. 13 is a diagram showing an air conditioning system 1F that executes a heating operation pattern C. [Figure 24] FIG. 1 is a diagram showing an air conditioning system 1F that executes a cooling operation pattern F. [Diagram 25] FIG. 13 is a diagram showing the configuration of an air conditioning system 1G according to a modified example, and is a diagram showing an air conditioning system 1F that executes a heating operation pattern F. [Figure 26] FIG. 13 is a diagram showing the configuration of an air conditioning system 1H according to a modified example, and is a diagram showing an air conditioning system 1F that executes a heating operation pattern F. [Figure 27] FIG. 13 is a diagram showing the configuration of an air conditioning system 1J according to a modified example, and is a diagram showing an air conditioning system 1F that executes a heating operation pattern F. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] An air conditioning system 1A embodying the present invention will be described below with reference to the drawings. As shown in Fig. 1, the air conditioning system 1A includes a heat pump 12, an indirect heat exchanger 13, a solar collector 14, a heat storage tank 15, an air-conditioned room 16, a ventilation device 17, a pumping well 181, and an injection well 182.

[0032] The heat pump 12 performs heat exchange by a heat pump method. The heat pump 12 generally includes a zero-side heat exchanger, a primary-side heat exchanger, a compressor, an expansion valve, and an intermediate refrigerant pipe. The intermediate refrigerant pipe is a circulation pipe through which a refrigerant flows. The heat pump 12 extracts heat from a liquid flowing through the zero-side heat exchanger, and heats or cools the liquid flowing through the primary-side heat exchanger. The indirect heat exchanger 13 performs heat exchange between the liquids flowing through two internal flow paths.

[0033] A first heat medium 30 is stored in the heat storage tank 15. In this embodiment, the first heat medium 30 and a first liquid 301, a second liquid 302, a third liquid 303, and a fourth liquid 304 described below are the same medium, and an example of the medium is an antifreeze liquid (e.g., an ethylene glycol aqueous solution, a propylene glycol aqueous solution). A temperature sensor 232 is provided in the first heat medium 30 in the heat storage tank 15. The temperature sensor 232 detects the temperature of the first heat medium 30 stored in the heat storage tank 15.

[0034] In the present embodiment, the air-conditioned room 16 is, for example, a vinyl greenhouse for cultivating agricultural products. The air-conditioned room 16 may be, for example, a room in a residence or a building.

[0035] The pumping well 181 and the reinjection well 182 are each provided facing downward (i.e., in the depth direction) from the ground surface 105. Well water 191, which is a second heat medium, is stored in the pumping well 181 and the reinjection well 182. A temperature sensor 231 is provided in the well water 191 of the pumping well 181. The temperature sensor 231 detects the temperature of the well water 191.

[0036] One end of the flow path 701 is connected to a pump 950 disposed in the well water 191 of the pumping well 181. The other end of the flow path 701 is connected to a branching section 801. One end of a flow path 702 is connected to the branching section 801, and the other end is connected to the indirect heat exchanger 13. An opening / closing valve 914 is provided in the flow path 702. The flow path 702 is connected to one end of a flow path 703 via a flow path in the indirect heat exchanger 13. The other end of the flow path 703 is disposed in the well water 191 of the reinjection well 182.

[0037] One end of the flow path 704 is connected to the branching portion 801, and the other end is connected to the water supply device 163 arranged in the air-conditioning room 16. An opening / closing valve 901 is provided in the flow path 704.

[0038] One end of the flow path 711 is connected to the indirect heat exchanger 13, and the other end is connected to the branching section 802. An on-off valve 902 is provided in the flow path 711. A pump 951 is provided in the flow path 711 between the on-off valve 901 and the indirect heat exchanger 13. One end of the flow path 712 is connected to the branching section 802, and the other end is connected to the heat pump 12. An on-off valve 910 is provided in the flow path 712.

[0039] Flow path 711 is connected to one end of flow path 713 via a flow path in indirect heat exchanger 13. The other end of flow path 713 is connected to branching section 803. Flow path 713 is provided with an on-off valve 903. One end of flow path 714 is connected to branching section 803, and the other end is connected to heat pump 12. Flow paths 712 and 714 are connected via a zero-side heat exchanger in heat pump 12. Flow path 714 is provided with an on-off valve 911.

[0040] One end of flow path 721 is connected to branch portion 802, and the other end is connected to branch portion 804. An on-off valve 904 is provided in flow path 721. One end of flow path 722 is connected to branch portion 803, and the other end is connected to branch portion 805. An on-off valve 905 is provided in flow path 722.

[0041] One end of flow path 731 is connected to heat storage tank 15, and the other end is connected to branching section 804. An on-off valve 912 is provided in flow path 731. One end of flow path 732 is connected to branching section 804, and the other end is connected to branching section 806. An on-off valve 906 is provided in flow path 732. One end of flow path 733 is connected to branching section 806, and the other end is connected to an air conditioner 161 arranged in air-conditioned room 16. The air conditioner 161 is, for example, a fan coil unit.

[0042] One end of the flow path 734 is connected to the heat storage tank 15, and the other end is connected to the branching portion 805. A pump 952 is provided in the flow path 734. An on-off valve 913 is provided in the flow path 734 between the pump 952 and the branching portion 805. One end of the flow path 735 is connected to the branching portion 805, and the other end is connected to the branching portion 807. An on-off valve 907 is provided in the flow path 735. One end of the flow path 736 is connected to the branching portion 807, and the other end is connected to the air conditioner 161.

[0043] One end of flow path 741 is connected to the heat pump 12, and the other end is connected to the branching section 806. An on-off valve 908 is provided in flow path 741. One end of flow path 742 is connected to the heat pump 12, and the other end is connected to the branching section 807. An on-off valve 909 is provided in flow path 742. A pump 953 is provided in flow path 742 between the on-off valve 909 and the heat pump 12. The flow paths 741 and 742 are connected via a primary heat exchanger in the heat pump 12.

[0044] One end of the flow path 751 is connected to the heat storage tank 15, and the other end is connected to the solar heat collector 14. A pump 954 is provided in the flow path 751. One end of the flow path 752 is connected to the solar heat collector 14, and the other end is connected to the heat storage tank 15. The flow paths 751 and 752 are connected via the solar heat collector 14.

[0045] A temperature sensor 234 is provided on the outside of the heat pump 12. The temperature sensor 234 detects the temperature of the outside air outside the air conditioning system 1A.

[0046] The air-conditioning room 16 is provided with a ventilation device 17 and a temperature sensor 235. The ventilation device 17 ventilates the air-conditioning room 16. In this embodiment, as an example, the ventilation device 17 is a ventilation fan and an opening / closing unit. The ventilation fan exhausts air inside the air-conditioning room 16 to the outside, thereby taking in outside air into the air-conditioning room 16. The opening / closing unit is, for example, a device that opens and closes an entrance / exit or a window of the air-conditioning room 16. Outside air is taken into the air-conditioning room 16 through the open entrance / exit or window. The temperature sensor 235 detects the indoor temperature of the air-conditioning room 16.

[0047] The electrical configuration of the air conditioning system 1A will be described with reference to Fig. 2. The air conditioning system 1A includes a heat pump 12, pumps 950, 951, 952, 953, and 954, a ventilator 17, a water supply device 163, and an air conditioner 161. The heat pump 12 is provided with a control panel 60. The control panel 60 includes a CPU 601, a ROM 602, and a RAM 603.

[0048] The CPU 601 controls the air conditioning system 1A. The CPU 601 is electrically connected to a ROM 602 and a RAM 603. The ROM 602 stores various program data such as programs for solar heat collection processing and operation switching processing, which will be described later. The RAM 603 stores various temporary data. A flash memory may be provided to store various data in the flash memory.

[0049] The CPU 601 controls the heat pump 12 to perform heat exchange by the heat pump method. The CPU 601 controls the pump 950 and the pump 951 to flow liquid to the indirect heat exchanger 13, and extracts heat from one liquid in the indirect heat exchanger 13 to heat or cool the other liquid. The CPU 601 controls the pump 954 to flow the first heat medium 30 to the solar collector 14, and the first heat medium 30 is heated by the heat of sunlight in the solar collector 14.

[0050] The CPU 601 is electrically connected to the temperature sensors 231, 232, 234, and 235. The temperature sensor 231 outputs a signal corresponding to the temperature of the well water 191 to the CPU 601. The CPU 601 detects the temperature of the well water 191 in the pumping well 181 based on the output of the temperature sensor 231. The temperature sensor 232 outputs a signal corresponding to the temperature of the first heat medium 30 in the heat storage tank 15 to the CPU 601. The CPU 601 detects the temperature of the first heat medium 30 stored in the heat storage tank 15 based on the output of the temperature sensor 232. The temperature sensor 234 outputs a signal corresponding to the outside air temperature to the CPU 601. The CPU 601 detects the outside air temperature based on the output of the temperature sensor 234. The temperature sensor 235 outputs a signal corresponding to the room temperature of the air-conditioned room 16 to the CPU 601. The CPU 601 detects the room temperature of the air-conditioned room 16 based on the output of the temperature sensor 235.

[0051] The CPU 601 is electrically connected to the air conditioner 161. The CPU 601 is also electrically connected to an operation unit 165 provided in the air conditioner 161. The CPU 601 controls the air conditioner 161. The CPU 601 controls the cooling and heating of the air conditioner 161 based on instructions from a user inputted from the operation unit 165.

[0052] The CPU 601 is electrically connected to the ventilation device 17. The CPU 601 controls the ventilation device 17 to ventilate the air-conditioned room 16. The CPU 601 is electrically connected to the water supply device 163. The CPU 601 controls the water supply device 163 to supply water into the air-conditioned room 16. In the present embodiment, as an example, water is supplied to crops in the air-conditioned room 16. The CPU 601 is electrically connected to the on-off valves 901 to 914. The CPU 601 controls the on-off valves 901 to 914 to open and close the flow paths.

[0053] The CPU 601 is electrically connected to the pumps 950, 951, 952, 953, and 954. As an example, the pumps 950, 951, 952, 953, and 954 are pumps (e.g., inverter pumps) capable of adjusting the flow rate of the liquid. In this embodiment, the CPU 601 is capable of detecting the flow rate of the liquid flowing through the flow path based on a signal corresponding to the flow rate of the liquid output from the pumps 950, 951, 952, 953, and 954. The CPU 601 may control the flow rate of the liquid flowing through the flow path based on the detected flow rate. Note that a flow rate sensor capable of detecting the flow rate of the liquid flowing through the flow path may be provided separately.

[0054] Although not shown, temperature sensors may be provided in the flow paths 712, 714, 741, and 742. The CPU 601 may detect the temperatures of the liquid flowing through the flow paths 712, 714, 741, and 742 based on signals from the temperature sensors, and drive the heat pump 12 while adjusting the flow rates of the liquid flowing through the flow paths 712, 714, 741, and 742.

[0055] Although not shown, temperature sensors may be provided in the flow paths 702, 703, 711, and 713. The CPU 601 may detect the temperatures of the liquid flowing through the flow paths 702, 703, 711, and 713 based on signals from the temperature sensors, and perform heat exchange by the indirect heat exchanger 13 while adjusting the flow rates of the liquid flowing through the flow paths 702, 703, 711, and 713. The CPU 601 is also assumed to be capable of measuring time and hour.

[0056] The operation patterns of the heating operation and the cooling operation performed in the air conditioning system 1A will be described with reference to Fig. 3 to Fig. 9. First, the operation pattern A will be described with reference to Fig. 3. The operation pattern A is an operation method in which the first heat medium 30 heated by the solar collector 14 is sent to the heat storage tank 15 to raise the temperature of the first heat medium 30 stored in the heat storage tank 15.

[0057] When the operation pattern A is performed, the CPU 601 closes the on-off valves 901 to 914. The CPU 601 drives the pump 954. This causes the first heat medium 30 to circulate between the heat storage tank 15 and the solar heat collector 14 (arrow 511 in FIG. 3). More specifically, the first heat medium 30 in the heat storage tank 15 flows from the heat storage tank 15 to the solar heat collector 14 via a flow path 751. In the solar heat collector 14, the first heat medium 30 is heated by solar heat. The heated first heat medium 30 flows to the heat storage tank 15 via a flow path 752. This causes the temperature of the first heat medium 30 in the heat storage tank 15 to rise.

[0058] Operation pattern B for performing heating will be described with reference to Fig. 4. In the following description, first liquid 301 is the first heat medium 30 itself. Operation pattern B is an operation method in which first liquid 301, which is the first heat medium 30 stored in heat storage tank 15, is sent from heat storage tank 15 to air conditioner 161, and heating operation is performed in air conditioner 161 using first liquid 301 as a heat source.

[0059] When the operation pattern B is performed, the CPU 601 opens the on-off valves 906, 907, 912, and 913, and closes the other on-off valves 901, 902, 903, 904, 905, 908, 909, 910, 911, and 914. The CPU 601 drives the pump 952. This causes the first liquid 301 to circulate between the heat storage tank 15 and the air conditioner 161 (see the arrow 521 in FIG. 4). More specifically, the first liquid 301 in the heat storage tank 15 flows to the air conditioner 161 via the flow paths 734, 735, and 736. In the air conditioner 161, a heating operation is performed by utilizing the heat of the first liquid 301. The first liquid 301 flows from the air conditioner 161 to the heat storage tank 15 via the flow paths 733, 732, and 731.

[0060] Operation pattern C for performing heating will be described with reference to Fig. 5. Operation pattern C is an operation method in which first liquid 301 is sent from heat storage tank 15 to heat pump 12, heat pump 12 exchanges heat between first liquid 301 and second liquid 302 to heat second liquid 302, and air conditioner 161 performs heating operation using second liquid 302 as a heat source. Second liquid 302 is a liquid between heat pump 12 and air conditioner 161.

[0061] When operating pattern C is performed, CPU 601 opens on-off valves 904, 905, 908, 909, 910, 911, 912, and 913, and closes the other on-off valves 901, 902, 903, 906, 907, and 914. CPU 601 drives pumps 952 and 953. As a result, first liquid 301 circulates between heat storage tank 15 and heat pump 12 (see arrow 531), and second liquid 302 circulates between heat pump 12 and air conditioner 161 (see arrow 532), and air conditioner 161 heats air-conditioned room 16.

[0062] More specifically, the first liquid 301 flows from the heat storage tank 15 to the heat pump 12 via flow paths 734, 722, and 714. The first liquid 301 used for heat exchange in the heat pump 12 flows to the heat storage tank 15 via flow paths 712, 721, and 731 (see arrow 531). The second liquid 302 flows from the heat pump 12 to the air conditioner 161 via flow paths 742 and 736. The second liquid 302 flows from the air conditioner 161 to the heat pump 12 via flow paths 733 and 741 (see arrow 532).

[0063] In the heat pump 12, heat is extracted from the first liquid 301 by the heat pump method, and the second liquid 302 is heated. The heat of the heated second liquid 302 is utilized in the air conditioner 161 to heat the air-conditioned room 16.

[0064] An operation pattern D for performing heating will be described with reference to FIG. 6. In the operation pattern D, heat derived from the well water 191 (i.e., the second heat medium) is utilized to heat the second liquid 302 in the heat pump 12. This is a heating method in which heating is performed in the air conditioner 161 using the second liquid 302 as a heat source. More specifically, the operation pattern D heats the third liquid 303 by heat exchange between the well water 191 and the third liquid 303 in the indirect heat exchanger 13, heats the second liquid 302 by heat exchange between the third liquid 303 and the second liquid 302 in the heat pump 12, and performs a heating operation in the air conditioner 161 using the second liquid 302 as a heat source. The third liquid 303 is a liquid between the indirect heat exchanger 13 and the heat pump 12.

[0065] When the operation pattern D is performed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, 911, and 914, and closes the other on-off valves 901, 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 950, 951, and 953. As a result, the well water 191 in the pumping well 181 flows to the return well 182 via the flow path 701, the flow path 702, the indirect heat exchanger 13, and the flow path 703 (see arrow 541). The third liquid 303 between the indirect heat exchanger 13 and the heat pump 12 circulates through the indirect heat exchanger 13, the flow path 711, the flow path 712, the heat pump 12, the flow path 714, the flow path 713, and the indirect heat exchanger 13 (see arrow 542). The second liquid 302 circulates through the heat pump 12, the flow path 742, the flow path 736, the air conditioner 161, the flow path 733, the flow path 741, and the heat pump 12 (see arrow 543).

[0066] In the indirect heat exchanger 13, heat is extracted from the well water 191 by indirect heat exchange, and the third liquid 303 is heated. In the heat pump 12, heat is extracted from the third liquid 303 by a heat pump system, and the second liquid 302 is heated. The heat of the heated second liquid 302 is utilized in the air conditioner 161 to heat the air-conditioned room 16.

[0067] Next, operation pattern E will be described. Operation pattern E may be executed when operation pattern F (see FIG. 7) and operation pattern G (see FIG. 8), which will be described later, are being performed. Operation pattern E is a ventilation operation. The ventilation operation is an operation for ventilating the air-conditioned room 16. When operation pattern E is being performed, CPU 601 controls ventilation device 17 to ventilate the air-conditioned room 16.

[0068] An operation pattern F for performing cooling will be described with reference to Fig. 7. The operation pattern F is an operation method in which cold heat derived from the well water 191 (i.e., the second heat medium) is supplied to the air conditioner 161 via a path different from the path in which the heat pump 12 exists, and cooling is performed in the air conditioner 161. More specifically, the operation pattern F performs heat exchange between the well water 191 and the fourth liquid 304 in the indirect heat exchanger 13 to cool the fourth liquid 304, and performs cooling operation in the air conditioner 161 using the fourth liquid 304 as a heat source. The fourth liquid 304 is a liquid between the indirect heat exchanger 13 and the air conditioner 161.

[0069] When the operation pattern F is performed, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, 907, and 914, and closes the other on-off valves 901, 908, 909, 910, 911, 912, and 913. The CPU 601 drives the pumps 950 and 951. As a result, the well water 191 in the pumping well 181 flows to the reinjection well 182 through the flow path 701, the flow path 702, the indirect heat exchanger 13, and the flow path 703 (see the arrow 561). The fourth liquid 304 between the indirect heat exchanger 13 and the air conditioner 161 circulates through the indirect heat exchanger 13, the flow path 711, the flow path 721, the flow path 732, the flow path 733, the air conditioner 161, the flow path 736, the flow path 735, the flow path 722, the flow path 713, and the indirect heat exchanger 13 (see the arrow 562).

[0070] In the indirect heat exchanger 13, the fourth liquid 304 is cooled by the cold energy of the well water 191 through indirect heat exchange. The cold energy of the cooled fourth liquid 304 is utilized in the air conditioner 161 to cool the air-conditioned room 16.

[0071] An operation pattern G for performing cooling will be described with reference to Fig. 8. The operation pattern G is an operation method in which cold energy derived from the well water 191 (i.e., the second heat medium) is utilized, the second liquid 302 is cooled in the heat pump 12, and cooling is performed in the air conditioner 161 using the second liquid 302 as a heat source. More specifically, the operation pattern G cools the third liquid 303 by heat exchange between the well water 191 and the third liquid 303 in the indirect heat exchanger 13, cools the second liquid 302 by heat exchange between the third liquid 303 and the second liquid 302 in the heat pump 12, and performs cooling operation using the second liquid 302 as a heat source in the air conditioner 161.

[0072] When the operation pattern G is performed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, 911, and 914, and closes the other on-off valves 901, 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 950, 951, and 953. As a result, the well water 191 in the pumping well 181 flows to the return well 182 via the flow path 701, the flow path 702, the indirect heat exchanger 13, and the flow path 703 (see arrow 571). The third liquid 303 between the indirect heat exchanger 13 and the heat pump 12 circulates through the indirect heat exchanger 13, the flow path 711, the flow path 712, the heat pump 12, the flow path 714, the flow path 713, and the indirect heat exchanger 13 (see arrow 572). The second liquid 302 circulates through the heat pump 12, the flow path 742, the flow path 736, the air conditioner 161, the flow path 733, the flow path 741, and the heat pump 12 (see arrow 573).

[0073] In the indirect heat exchanger 13, cold energy is extracted from the well water 191 by indirect heat exchange, and the third liquid 303 is cooled. In the heat pump 12, cold energy is extracted from the third liquid 303 by a heat pump system, and the second liquid 302 is cooled. The cold energy of the cooled second liquid 302 is used in the air conditioner 161 to cool the air-conditioned room 16.

[0074] 9, an operation pattern H for supplying water to the air-conditioned room 16 will be described. The operation pattern H is an operation method for supplying well water 191 to the water supply device 163.

[0075] When operating pattern H is performed, CPU 601 opens on-off valve 901 and closes other on-off valves 902 to 914. CPU 601 drives pump 950. As a result, well water 191 from pumping well 181 flows through flow paths 701 and 704 to water supply device 163 in air-conditioning room 16 (see arrow 581). As a result, well water 191 is supplied from water supply device 163 to inside air-conditioning room 16. The supplied well water 191 is used, for example, for watering agricultural crops.

[0076] 10 to 15, the solar heat collection process and the operation switching process executed by the CPU 601 will be described. The solar heat collection process and the operation switching process are executed, for example, when the power supply of the air conditioning system 1A is turned on. The CPU 601 reads out a program for the solar heat collection process and the operation switching process from the ROM 602, and loads it in the RAM 603. The CPU 601 performs the solar heat collection process and the operation switching process according to the program for the solar heat collection process and the operation switching process. The solar heat collection process and the operation switching process are executed in parallel. That is, the solar heat collection process is executed while the operation switching process is being executed.

[0077] The solar heat collection process is a process for controlling the execution of the operation pattern A. As shown in FIG. 10, in the solar heat collection process, first, it is determined whether the current time is within the sunshine hours or not (S101). The sunshine hours are set in advance and stored in, for example, the ROM 602. The sunshine hours are set, for example, from 9:00 to 16:00. The sunshine hours may be changed depending on the date and season. Also, a sunshine amount detection unit that detects the amount of sunshine may be provided, and the CPU 601 may determine whether the current time is within the sunshine hours or not depending on the output of the sunshine amount detection unit.

[0078] If the current time is not within the daylight hours (S101: NO), the process of S101 is repeated. If the current time is within the daylight hours (S101: YES), it is determined whether the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or higher than a predetermined temperature (S102). The predetermined temperature is, for example, 85°C. If the temperature T of the first heat medium 30 in the heat storage tank 15 is equal to or higher than the predetermined temperature (S102: YES), the process returns to S101.

[0079] If the temperature T of the first heat medium 30 stored in the heat storage tank 15 is not equal to or higher than the predetermined temperature (S102: NO), the operation of the operation pattern A (see FIG. 3) is started (S103). As described above, the first heat medium 30 is circulated between the heat storage tank 15 and the solar collector 14, and the temperature of the first heat medium 30 in the heat storage tank 15 is increased by solar heat. The operation pattern A is also executed while the operation patterns B, C, D, E, F, G, and H executed in the process described later are being executed. When the operation patterns B and C are being executed, the first heat medium 30 in the heat storage tank 15 is used as a heat source for heating the air-conditioned room 16. Therefore, depending on the amount of solar radiation and the heating load of the air conditioner 161, the temperature T of the first heat medium 30 in the heat storage tank 15 may decrease or increase even when the operation pattern A is being executed.

[0080] Next, similarly to S101, it is determined whether the current time is within the daylight hours (S104). If it is within the daylight hours (S104: YES), it is determined whether the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or higher than a predetermined temperature (S105), similarly to S102. If the temperature T of the first heat medium 30 stored in the heat storage tank 15 is not equal to or higher than the predetermined temperature (S105: NO), the process returns to S104. That is, the operation pattern A continues.

[0081] As time passes and it is no longer within the sunshine hours, it is determined that the current time is not within the sunshine hours (S104: NO), and the CPU 601 stops the pump 954 and ends the operation of operation pattern A (S106). Furthermore, if the temperature T of the first heat medium 30 stored in the heat storage tank 15 becomes equal to or higher than a predetermined temperature while the operation pattern A is being executed (S105: YES), the CPU 601 ends the operation of operation pattern A (S106). Then, the process returns to S101.

[0082] The operation switching process will be described with reference to Fig. 11 to Fig. 15. In the operation switching process, first, it is determined whether or not to supply water using water supply device 163 (S200). For example, when it is time for water supply device 163 to supply water, it is determined that water will be supplied. The time to supply water is set in advance and stored in, for example, ROM 602 or RAM 603. Also, when a user operates the operation unit of water supply device 163 and inputs an instruction to supply water, it may be determined that water will be supplied.

[0083] When water supply is not to be performed (S200: NO), it is determined whether or not to perform heating by the air conditioner 161 (S201). For example, when the user operates the operation unit 165 of the air conditioner 161 and inputs an instruction to perform heating, it is determined that heating is to be performed.

[0084] If heating is not to be performed (S201: NO), a determination is made as to whether or not cooling is to be performed by the air conditioner 161 (S202). For example, if the user operates the operation unit 165 of the air conditioner 161 and inputs an instruction to perform cooling, it is determined that cooling is to be performed. If cooling is not to be performed (S202: NO), the process returns to S200.

[0085] When it is determined in S201 that heating is to be performed (S201: YES), it is determined whether or not the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than a first temperature T1 (S203). In the present embodiment, as an example, the first temperature T1 is set to 40°C.

[0086] When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the first temperature T1 (S203: YES), the heating operation pattern B (see FIG. 4) is executed (S204). As described above, the first liquid 301 circulates between the heat storage tank 15 and the air conditioner 161, and the air-conditioned room 16 is heated by the air conditioner 161.

[0087] Next, it is determined whether or not the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the first temperature T1 (S205). If the temperature T of the first heat medium 30 stored in the heat storage tank 15 is not equal to or lower than the first temperature T1 (S205: NO), it is determined whether or not to stop heating (S206). If the heating is not to be stopped (S206: NO), the process returns to S205.

[0088] For example, when the user operates the operation unit 165 of the air conditioner 161 and inputs an instruction to stop heating, it is determined that heating is to be stopped. Also, for example, when it is determined that water is to be supplied by the water supply device 163, it is determined that heating is to be stopped. When it is determined that heating is to be stopped (S206: YES), heating according to the operation pattern B is stopped (S207). In S207, the driving of the pump 952 is stopped. Next, the process returns to S200.

[0089] When operation pattern B started in S204 is continued, heat continues to be collected from the first liquid 301 in the air conditioner 161. For this reason, when operation pattern A (see FIG. 3) for collecting solar heat is not being performed, the temperature T of the first heat medium 30, which is the first liquid 301 stored in the heat storage tank 15, gradually decreases. Even when operation pattern A is being performed, the temperature T of the first heat medium 30 stored in the heat storage tank 15 may gradually decrease. When the temperature T of the first heat medium 30 stored in the heat storage tank 15 becomes equal to or lower than the first temperature T1 (S205: YES), the process proceeds to the process of S302 (see FIG. 12) described later, and the operation pattern is switched to the heating operation pattern C (see FIG. 5).

[0090] In the process of S203, if the temperature T is not higher than the first temperature T1 (S203: NO), as shown in Fig. 12, it is determined whether the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the second temperature T2 and is equal to or lower than the first temperature T1 (S301). The second temperature T2 is a temperature lower than the first temperature T1. In the present embodiment, the second temperature T2 is set to 20°C, for example.

[0091] If the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the second temperature T2 and is equal to or lower than the first temperature T1 (S301: YES), the heating operation pattern C (see FIG. 5) is executed (S302). As described above, the first liquid 301 circulates between the heat storage tank 15 and the heat pump 12, and the second liquid 302 circulates between the heat pump 12 and the air conditioner 161, and the air-conditioned room 16 is heated in the air conditioner 161.

[0092] Next, it is determined whether the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or higher than a third temperature T3 (S303). The third temperature T3 is a temperature higher than the first temperature T1. The third temperature T3 is, for example, 60° C. If the temperature T of the first heat medium 30 stored in the heat storage tank 15 is not equal to or higher than the third temperature T3 (S303: NO), it is determined whether the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the second temperature T2 (S304).

[0093] If the temperature T of the first heat medium 30 stored in the heat storage tank 15 is not equal to or lower than the second temperature T2 (S304: NO), similarly to S206 (see FIG. 11), it is determined whether or not to stop heating (S305). If the heating is not to be stopped (S305: NO), the process returns to S303.

[0094] If it is determined that the heating should be stopped (S206: YES), the heating according to the operation pattern C is stopped (S306). In S306, the driving of the pumps 952, 953 is stopped. Then, the process returns to S200 (see FIG. 11).

[0095] When operation pattern C started in S302 is continued, heat pump 12 continues to extract heat from first liquid 301. For this reason, when operation pattern A (see FIG. 3) is not being performed, temperature T of first heat medium 30, which is first liquid 301 stored in heat storage tank 15, gradually decreases. Even when operation pattern A is being performed, temperature T of first heat medium 30 stored in heat storage tank 15 may gradually decrease. When temperature T of first heat medium 30 stored in heat storage tank 15 becomes equal to or lower than second temperature T2 (S304: YES), processing proceeds to S402 (see FIG. 13) described later, and operation pattern D (see FIG. 6) is switched to.

[0096] Furthermore, even if operation pattern C is being performed, the first heat medium 30 may be heated by solar heat due to operation pattern A, and the temperature T of the first heat medium 30 stored in the heat storage tank 15 may gradually increase. When the temperature T of the first heat medium 30 stored in the heat storage tank 15 becomes equal to or higher than the third temperature T3 (S303: YES), the process proceeds to S204 (see FIG. 11) and switches to operation pattern B (see FIG. 4).

[0097] When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the second temperature T2, it is determined as NO in S203 and NO in S301. When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the second temperature T2 (NO in S301), the heating operation pattern D (see FIG. 6) is executed (S402) as shown in FIG. 13. As described above, the well water 191 in the pumping well 181 flows to the return well 182 via the indirect heat exchanger 13. In addition, the third liquid 303 circulates between the indirect heat exchanger 13 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161, and the air-conditioned room 16 is heated by the air conditioner 161.

[0098] Next, it is determined whether or not the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or higher than a fourth temperature T4 (S403). The fourth temperature T4 is a temperature higher than the second temperature T2. In this embodiment, the fourth temperature T4 is 40° C., for example. If the temperature T of the first heat medium 30 stored in the heat storage tank 15 is not equal to or higher than the fourth temperature T4 (S403: NO), it is determined whether or not to stop heating, as in S206 (S404). If the heating is not to be stopped (S404: NO), the process returns to S402.

[0099] If it is determined that heating should be stopped (S404: YES), heating according to operation pattern D is stopped (S405). In S405, the driving of pumps 950, 951, and 953 is stopped. Next, the process returns to S200 (see FIG. 11).

[0100] The well water 191 of the pumping well 181 is constantly supplied to the pumping well 181 from an aquifer (not shown). Therefore, the temperature of the pumping well 181 is unlikely to change. Therefore, the CPU 601 can continue the operation pattern D started in S402.

[0101] Furthermore, there are cases where operation pattern A (see FIG. 3) is performed while operation pattern D (see FIG. 6) is being performed. In operation pattern D, the heat of the first heat medium 30 stored in heat storage tank 15 is not used for heating by the air conditioner 161. For this reason, when operation pattern A is being executed, the temperature of the first heat medium 30 stored in heat storage tank 15 rises. When temperature T of the first heat medium 30 stored in heat storage tank 15 becomes equal to or higher than fourth temperature T4 (S403: YES), the process proceeds to S302 (see FIG. 12) and switches to operation pattern C (see FIG. 5).

[0102] As described above, the heating operation of the air conditioning system 1A is performed while the operation pattern changes among the operation pattern B, the operation pattern C, and the operation pattern D. Furthermore, there are cases in which the operation pattern A is executed.

[0103] In S202 (see FIG. 11), when it is determined that cooling is to be performed by the air conditioner 161 (S202: YES), the process proceeds to S501 shown in FIG. 14. In the following description, the room temperature of the air-conditioned room 16 is referred to as the room temperature T80. The target temperature of the room temperature of the air-conditioned room 16 when the air conditioner 161 is in operation is referred to as the room set temperature T81. Note that the room set temperature T81 is, for example, input by a user operating the operation unit 165 and acquired by the CPU 601.

[0104] Moreover, the temperature of the second heat medium (in this embodiment, the well water 191) is referred to as the second heat medium temperature T82. The difference between the room temperature T80 and the second heat medium temperature T82 is referred to as the temperature difference T90. The CPU 601 detects the room temperature T80 of the air-conditioned room 16 based on the output of the temperature sensor 235. The CPU 601 detects the second heat medium temperature T82 based on the output of the temperature sensor 231.

[0105] In S501, in a state in which the indoor temperature T80 is higher than the second heat medium temperature T82, it is determined whether or not the temperature difference T90 is larger than a predetermined temperature difference T91 (S501). The predetermined temperature difference T91 is, for example, 10°C.

[0106] If the temperature difference T90 is greater than the predetermined temperature difference T91 (S501: YES), the cooling operation pattern F (see FIG. 7) is executed (S502). As described above, the well water 191 in the pumping well 181 flows to the return well 182 via the indirect heat exchanger 13. In addition, the fourth liquid 304 circulates between the indirect heat exchanger 13 and the air conditioner 161, and the air conditioner 161 cools the air-conditioned room 16.

[0107] Next, it is determined whether the outdoor air temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S503). Note that in FIG. 14, due to space limitations, it is written "Is the outdoor air temperature T95 a predetermined condition?" (the same applies to S506, S509 described below, and S603, S606, and S609 in FIG. 15). The CPU 601 detects the outdoor air temperature T95 based on the output of the temperature sensor 234. If the outdoor air temperature T95 is not lower than the indoor set temperature T81 and is not lower than the indoor temperature T80 (S503: NO), the process proceeds to S505 described below.

[0108] If the outdoor temperature T95 is lower than the indoor set temperature T81, or is higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S503: YES), the ventilation operation pattern E is executed (S504). As described above, the CPU 601 drives the ventilation device 17 to ventilate the air-conditioned room 16.

[0109] Next, it is determined whether the ventilation operation pattern E is in operation (S505). If the operation pattern E is in operation (S505: YES), it is determined whether the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S506), as in S503. If the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S506: YES), it is determined whether the temperature difference T90 is greater than a predetermined temperature difference T91 in a state in which the indoor temperature T80 is higher than the second heat medium temperature T82, as in S501 (S507).

[0110] If the temperature difference T90 is greater than the predetermined temperature difference T91 (S507: YES), it is determined whether or not to stop cooling (S511). If the cooling is not to be stopped (S511: NO), the process returns to S505.

[0111] For example, when the user operates the operation unit 165 of the air conditioner 161 and inputs an instruction to stop cooling, it is determined that cooling is to be stopped. Also, for example, when it is determined that water is to be supplied by the water supply device 163, it is determined that cooling is to be stopped. When it is determined that cooling is to be stopped (S511: YES), cooling according to operation pattern F is stopped (S512). In S512, the driving of the pumps 950, 951 is stopped. Also, when ventilation according to operation pattern E is being performed, ventilation is stopped (S512). Next, the process returns to S200 (see FIG. 11).

[0112] In S506, if the outside air temperature T95 is not lower than the indoor set temperature T81 and is not lower than the indoor temperature T80 (S506: NO), the operation pattern E is stopped (S508). That is, ventilation of the air-conditioned room 16 using the ventilation device 17 is stopped. Note that cooling of the air-conditioned room 16 by the operation pattern F continues. Next, the process proceeds to S507.

[0113] In S505, if the operation pattern E is not in operation (S505: NO), similarly to S503, it is determined whether the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S509). If the outdoor temperature T95 is not lower than the indoor set temperature T81 and is not lower than the indoor temperature T80 (S509: NO), the process proceeds to S507.

[0114] If the outside air temperature T95 is lower than the indoor set temperature T81, or is higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S509: YES), the operation pattern E is performed (S510) as in S504. This starts ventilation of the air-conditioned room 16 using the ventilation device 17. Next, the process proceeds to S507.

[0115] In S507, if the temperature difference T90 is not greater than the predetermined temperature difference T91 (S507: NO), the process proceeds to S602 (see FIG. 15) described later, and the operation pattern F is switched to the operation pattern G.

[0116] In S501, if the temperature difference T90 is not greater than the predetermined temperature difference T91 (S501: NO), as shown in Fig. 15, the cooling operation pattern G (see Fig. 8) is executed (S602). As described above, the well water 191 in the pumping well 181 flows to the return well 182 via the indirect heat exchanger 13. In addition, the third liquid 303 circulates between the indirect heat exchanger 13 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161, and the air-conditioned room 16 is cooled by the air conditioner 161.

[0117] Next, similarly to S503, it is determined whether the outside air temperature T95 is lower than the indoor set temperature T81, or whether it is higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S603). The CPU 601 detects the outside air temperature T95 based on the output of the temperature sensor 234. If the outside air temperature T95 is not lower than the indoor set temperature T81 and is not lower than the indoor temperature T80 (S603: NO), the process proceeds to S605, which will be described later.

[0118] If the outside air temperature T95 is lower than the indoor set temperature T81, or is higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S603: YES), the ventilation operation pattern E is executed (S604).

[0119] Next, it is determined whether the ventilation operation pattern E is in operation (S605). If the operation pattern E is in operation (S605: YES), it is determined whether the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80, as in S603 (S606). If the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S606: YES), it is determined whether the temperature difference T90 is larger than the predetermined temperature difference T91 in a state in which the indoor temperature T80 is higher than the second heat medium temperature T82, as in S501 (see FIG. 14) (S607). If the temperature difference T90 is not larger than the predetermined temperature difference T91 (S607: NO), it is determined whether to stop cooling, as in S511 (S611). If the cooling is not stopped (S611: NO), the process returns to S605.

[0120] If it is determined that cooling should be stopped (S611: YES), cooling according to operation pattern G is stopped (S612). In S612, the driving of pumps 950, 951, 953 is stopped. Also, if ventilation according to operation pattern E is being performed, ventilation is stopped (S612). Next, the process returns to S200 (see FIG. 11).

[0121] In S606, if the outside air temperature T95 is not lower than the indoor set temperature T81 and is not lower than the indoor temperature T80 (S606: NO), the operation pattern E is stopped (S608). That is, ventilation of the air-conditioned room 16 using the ventilation device 17 is stopped. Note that cooling of the air-conditioned room 16 by the operation pattern G continues. Next, the process proceeds to S607.

[0122] In S605, if the operation pattern E is not in operation (S605: NO), similarly to S603, it is determined whether the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S609). If the outdoor temperature T95 is not lower than the indoor set temperature T81 and is not lower than the indoor temperature T80 (S609: NO), the process proceeds to S607.

[0123] If the outside air temperature T95 is lower than the indoor set temperature T81, or is higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S609: YES), the operation pattern E is performed (S610) as in S604. This starts ventilation of the air-conditioned room 16 using the ventilation device 17. Next, the process proceeds to S607.

[0124] In S607, if the temperature difference T90 is greater than the predetermined temperature difference T91 (S607: YES), the process proceeds to S502 (see FIG. 14) and the operation pattern G is switched to the operation pattern F.

[0125] 11, when water is supplied using the water supply device 163 (S200: YES), the operation pattern H (see FIG. 9) is executed (S701). As described above, the well water 191 is sent to the water supply device 163, and the well water 191 is supplied from the water supply device 163 to the air-conditioned room 16.

[0126] Next, it is determined whether or not to stop water supply using the water supply device 163 (S702). If water supply is not to be stopped (S702: NO), the process of S702 is repeated. For example, when water supply has been performed for a predetermined time (e.g., 3 minutes), it is determined that water supply is to be stopped.

[0127] If water supply is to be stopped (S702: YES), the operation pattern H is stopped (S703). In S703, the CPU 601 stops the pump 950. Next, the process returns to S200.

[0128] As described above, the air conditioning system 1A performs cooling operation while switching between operation patterns F and G. In addition, ventilation operation pattern E may be executed. In addition, water supply operation pattern H may be executed. In addition, operation pattern A may be executed. Note that while cooling is being performed, solar heat collection processing (see FIG. 10) does not need to be performed. In this case, since operation pattern A is not executed during cooling, the power consumption of the air conditioning system 1A can be reduced.

[0129] The process of this embodiment is executed as described above. In this embodiment, the air conditioner 161 can perform heating operation by utilizing heat derived from at least the first heat medium 30 stored in the heat storage tank 15 (see Figs. 4 and 5). When the air conditioner 161 performs heating operation, it can switch between a plurality of heating operation modes according to the temperature T of the first heat medium 30 stored in the heat storage tank 15 detected by the temperature sensor 232. Therefore, the heat stored in the heat storage tank 15 can be used more efficiently than when the heating operation mode cannot be switched.

[0130] Furthermore, when the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the first temperature T1 (S203: YES in FIG. 11), the heating operation pattern B is executed (S204 in FIG. 11). When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the first temperature T1 (S203: NO in FIG. 11 or S205: YES in FIG. 11), the heating operation pattern C is executed (S302 in FIG. 12). In this case, the operation pattern is switched between the operation pattern B (see FIG. 4) and the operation pattern C (see FIG. 5) depending on the temperature T of the first heat medium 30 stored in the heat storage tank 15.

[0131] More specifically, when the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the first temperature T1, the operation pattern B is executed, and the heat derived from the first liquid 301 is supplied to the air conditioner 161 through a route different from the heat pump 12, and is used as a heat source for heating in the air conditioner 161 (see FIG. 4). As a result, the power consumption of the air conditioning system 1A is reduced compared to when the heat pump 12 is used for heating, and the air conditioner 161, which has improved efficiency, extracts heat from the first liquid 301, and when the temperature T of the first heat medium 30 stored in the heat storage tank 15 drops and becomes equal to or lower than the first temperature T1, the operation pattern is switched from the operation pattern B to the operation pattern C (see FIG. 5). As a result, the operation is switched to a heating operation in which the heat pump 12 is used, and the heat derived from the first liquid 301 is used to heat the second liquid 302 in the heat pump 12, and heating is performed in the air conditioner 161 using the second liquid 302 as a heat source (see FIG. 5). Therefore, the temperature of the heat medium (i.e., the second liquid 302) sent to the air conditioner 161 is higher than when the heat pump 12 is not used. Therefore, the heat of the first heat medium 30 stored in the heat storage tank 15 can be used for heating operation until the temperature T of the first heat medium 30 stored in the heat storage tank 15 becomes lower than when the heat pump 12 is not used. Therefore, the heat of the first heat medium 30 stored in the heat storage tank 15 can be used more efficiently.

[0132] In operation pattern B, the first liquid 301 is sent from the heat storage tank 15 to the air conditioner 161, and heating is performed in the air conditioner 161 using the first liquid 301 as a heat source (see FIG. 4). In operation pattern C, the first liquid 301 is sent from the heat storage tank 15 to the heat pump 12, and in the heat pump 12, heat is exchanged between the first liquid 301 and the second liquid 302 to heat the second liquid 302, and heating is performed in the air conditioner 161 using the second liquid 302 as a heat source (see FIG. 5).

[0133] In this manner, in the operation pattern B, the first liquid 301 is sent directly from the heat storage tank 15 to the air conditioner 161 to heat the air-conditioned room 16. As a result, the heat derived from the first heat medium 30 is used to perform heating. When the operation pattern C is performed, the heat derived from the first heat medium 30 is supplied to the air conditioner 161 via the heat pump 12 to heat the air-conditioned room 16. For this reason, the cost of the air-conditioning system can be reduced compared to, for example, a case in which both a heat exchanger and a heat pump 12 are provided. In addition, in the operation pattern B, the first liquid 301 is directly supplied to the air conditioner 161 to perform air conditioning, so that the heat energy is not consumed in the heat exchanger, and the efficiency of transferring heat to the air conditioner 161 is improved compared to a case in which a heat exchanger (for example, an indirect heat exchanger 131 (see FIG. 22) described later) is provided between the heat storage tank 15 and the air conditioner 161. In addition, in the operation pattern C, the first liquid 301 is directly supplied to the heat pump 12 to perform heat exchange. Therefore, compared to the case where a heat exchange unit is provided between heat storage tank 15 and heat pump 12, thermal energy is not consumed in the heat exchange unit, and the efficiency of transferring heat to air conditioner 161 is improved.

[0134] Furthermore, when the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the second temperature T2 and is equal to or lower than the first temperature T1 (S301: YES in FIG. 12 or S205: YES in FIG. 11), the heating operation pattern C (see FIG. 5) is executed (S302 in FIG. 12). When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the second temperature T2 (S301: NO in FIG. 12 or S304: YES in FIG. 12), the heating operation pattern D (see FIG. 6) is executed (S402 in FIG. 13). In the operation pattern D, the heat derived from the well water 191 (i.e., the second heat medium) is utilized to heat the second liquid 302 in the heat pump 12. The air conditioner 161 performs a heating operation using the second liquid 302 as a heat source. In this way, depending on the temperature T of the first heat medium 30 stored in the heat storage tank 15, the operation pattern is switched between the operation pattern C (see FIG. 5) and the operation pattern D (see FIG. 6).

[0135] More specifically, when the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the second temperature T2 and is equal to or lower than the first temperature T1, the operation pattern C is executed, the first liquid 301 is sent from the heat storage tank 15 to the heat pump 12, and the heating operation using the heat pump 12 is performed. When the temperature T of the first heat medium 30 stored in the heat storage tank 15 drops due to the heat extraction from the first liquid 301 by the heat pump 12 and becomes equal to or lower than the second temperature T2, the operation pattern C is switched to the operation pattern D. As a result, the operation is switched to the heating operation in which the well water 191 (i.e., the second heat medium) is used as the heat source, and heat is no longer extracted from the first heat medium 30 stored in the heat storage tank 15. This reduces the possibility that the temperature T of the first heat medium 30 drops too much and becomes unusable for heating. On the other hand, the well water 191, which is the second heat medium, is continuously supplied from an aquifer (not shown), so that the temperature is unlikely to change. This allows the air conditioner 161 to continue heating. In addition, even though the temperature T of the first heat medium 30 stored in the heat storage tank 15 is too low, heat is collected by the heat pump 12, and the power consumption of the air conditioning system 1A is reduced, improving efficiency, compared to a case in which the power consumption of the heat pump unit is high.

[0136] In addition, in this embodiment, an indirect heat exchanger 13 is provided. When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the second temperature T2 (S301: NO in FIG. 12 or S304: YES in FIG. 12), heat is exchanged between the well water 191 (i.e., the second heat medium) and the third liquid 303 in the indirect heat exchanger 13, and the third liquid 303 is heated. In the heat pump 12, heat is exchanged between the third liquid 303 and the second liquid 302, and the second liquid 302 is heated. In the air conditioner 161, a heating operation of the operation pattern D (see FIG. 6) is performed using the second liquid 302 as a heat source. In this way, when the operation pattern D is performed, heat derived from the well water 191 (i.e., the second heat medium) is supplied to the air conditioner 161 via the indirect heat exchanger 13 and the heat pump 12, and the air-conditioned room 16 is heated. Since the indirect heat exchanger 13 is provided, the well water 191 (i.e., the second heat medium) is not directly supplied to the heat pump 12. Therefore, even if the well water 191 (i.e., the second heat medium) contains impurities, for example, the possibility that the heat pump 12 will break down due to the influence of the impurities can be reduced.

[0137] In addition, when the indoor temperature T80 is higher than the second heat medium temperature T82, and the temperature difference T90 between the indoor temperature T80 and the second heat medium temperature T82 is larger than the predetermined temperature difference T91 (S501: YES in FIG. 14 or S607: YES in FIG. 15), the cooling operation pattern F (see FIG. 7) is executed (S502 in FIG. 14). As a result, the cold energy derived from the well water 191 (i.e., the second heat medium) is supplied to the air conditioner 161 through a path different from the path through which the heat pump 12 exists, and cooling is performed in the air conditioner 161. When the indoor temperature T80 is higher than the second heat medium temperature T82, and the temperature difference T90 is equal to or smaller than the predetermined temperature difference T91 (S501: NO in FIG. 14 or S507: NO in FIG. 15), the cooling operation pattern G (see FIG. 8) is executed (S602 in FIG. 15). As a result, the cold energy derived from the well water 191 (i.e., the second heat medium) is utilized to cool the second liquid 302 in the heat pump 12. In the air conditioner 161, cooling is performed using the second liquid 302 as a heat source. In this case, the operation pattern is switched between operation pattern F (see FIG. 7) and operation pattern G (see FIG. 8) according to the temperature difference T90 being a predetermined temperature difference T91.

[0138] In this way, when the temperature difference T90 between the room temperature T80 and the second heat medium temperature T82 is larger than the predetermined temperature difference T91, the cold energy derived from the well water 191 (i.e., the second heat medium) is supplied to the air conditioner 161 through a path different from the path through which the heat pump 12 exists, and is used as a heat source for cooling in the air conditioner 161. This reduces the power consumption of the air conditioning system and improves efficiency compared to when the heat pump 12 is used for cooling. When the room temperature T80 changes, or the temperature of the well water 191 (i.e., the second heat medium) changes due to the season or the like, and the temperature difference T90 becomes equal to or smaller than the predetermined temperature difference T91, the operation pattern is switched from the operation pattern F to the operation pattern G (see FIG. 8). This switches to cooling operation using the heat pump 12. Therefore, the temperature of the heat medium (i.e., the second liquid 302) sent to the air conditioner 161 becomes lower than when the heat pump 12 is not used. Therefore, when the temperature difference T90 is equal to or smaller than the predetermined temperature difference T91, the air-conditioned room 16 can be cooled more easily by the air conditioner 161 than when the heat pump 12 is not used.

[0139] In this embodiment, an indirect heat exchanger 13 is provided. When the indoor temperature T80 is higher than the second heat medium temperature T82 and the temperature difference T90 is larger than the predetermined temperature difference T91 (S501 in FIG. 14: YES or S607 in FIG. 15: YES), heat is exchanged between the well water 191 (i.e., the second heat medium) and the fourth liquid 304 in the indirect heat exchanger 13, and the fourth liquid 304 is cooled. In the air conditioner 161, the cooling operation of the operation pattern F (see FIG. 7) is performed using the fourth liquid 304 as a heat source (S502 in FIG. 14). In a state where the indoor temperature T80 is higher than the second heat medium temperature T82, when the temperature difference T90 is equal to or smaller than the predetermined temperature difference T91 (S501: NO in FIG. 14 or S507: NO), heat is exchanged between the well water 191 (i.e., the second heat medium) and the third liquid in the indirect heat exchanger 13, and the third liquid 303 is cooled. In the heat pump 12, heat is exchanged between the third liquid 303 and the second liquid 302, and the second liquid 302 is cooled. In the air conditioner 161, the second liquid 302 is used as a heat source, and a cooling operation of the operation pattern G (see FIG. 8) is performed (S602 in FIG. 15).

[0140] In this way, in the operation pattern F (see FIG. 7), cold heat derived from the well water 191 (i.e., the second heat medium) is supplied to the air conditioner 161 via the indirect heat exchanger 13 to cool the air-conditioned room 16. In the second cooling operation, cold heat derived from the well water 191 (i.e., the second heat medium) is supplied to the air conditioner 161 via the indirect heat exchanger 13 and the heat pump 12 to cool the air-conditioned room 16. Since the indirect heat exchanger 13 is provided, when the operation patterns F and G are performed, the well water 191 (i.e., the second heat medium) is not directly supplied to the heat pump 12. Therefore, for example, even if the well water 191 (i.e., the second heat medium) contains impurities, the possibility that the heat pump 12 will break down due to the influence of the impurities can be reduced.

[0141] In this manner, in this embodiment, a plurality of cooling operation modes can be switched depending on the temperature difference T90, which is the difference between the indoor temperature T80 and the second heat medium temperature T82 (see Figs. 7 and 8). Therefore, the power consumption of the air conditioning system 1A is reduced and the efficiency is improved compared to a case in which the cooling operation mode cannot be switched despite fluctuations in the heat load of the air-conditioned room 16.

[0142] In addition, when the cooling operation pattern F (see FIG. 7) is executed (S502 in FIG. 14), if the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature T81 and lower than the indoor temperature T80 (S503: YES, or S509: YES in FIG. 14), the ventilation operation pattern E is executed (S504 or S510 in FIG. 14). In addition, when the operation pattern G (see FIG. 8) is executed (S602 in FIG. 15), if the outdoor temperature T95 is lower than the indoor set temperature T81, or higher than the indoor set temperature and lower than the indoor temperature T80 (S603: YES, or S609: YES in FIG. 15), the ventilation operation pattern E is executed (S604 or S610 in FIG. 15). When the air conditioner 161 is in cooling operation, the air-conditioned room 16 is ventilated, so the temperature in the air-conditioned room 16 drops faster than when ventilation is not performed. Therefore, the power consumption of the air-conditioning system 1A is reduced and efficiency is improved compared to when only the cooling operation patterns F and G are performed and ventilation of the air-conditioned room 16 is not performed.

[0143] Furthermore, the water supply operation pattern H (see FIG. 9) is executed, in which well water 191 is supplied to the water supply device 163 (S702 in FIG. 11). This allows water to be supplied to the air-conditioned room 16.

[0144] Also, a solar collector 14 is provided as a heating unit that heats the first heat medium 30 stored in the heat storage tank 15. When the heating operation pattern C (see FIG. 5) is being performed (S302 in FIG. 12), if the first heat medium 30 stored in the heat storage tank 15 is heated by the solar collector 14 and becomes equal to or higher than the third temperature T3 (S303 in FIG. 12: YES), the operation pattern is switched to the operation pattern B (S204 in FIG. 11). Since the operation pattern B, which does not use the heat pump 12, is switched to after the first heat medium 30 is heated by the solar collector 14, the operation pattern B can be executed for a longer period of time than when the solar collector 14 is not provided. Also, since the operation pattern C, which uses the heat pump 12, is switched to the operation pattern B, which does not use the heat pump 12, the power consumption of the air conditioning system 1A is reduced, and the efficiency is improved.

[0145] In addition, when the heating operation pattern D (see FIG. 6) is being performed (S402 in FIG. 13), if the first heat medium 30 stored in the heat storage tank 15 is heated by the solar collector 14 and becomes equal to or higher than the fourth temperature T4 (S403 in FIG. 13: YES), the operation pattern is switched to the operation pattern C (S302 in FIG. 12). Since the operation pattern D is switched to the operation pattern C after the first heat medium 30 is heated by the solar collector 14, the operation pattern C can be executed for a longer time than when the solar collector 14 is not provided. In addition, the operation pattern D using the well water 191 as the second heat medium is switched to the operation pattern C using the first heat medium 30 stored in the heat storage tank 15. In the operation pattern C, the first heat medium 30 heated by the solar collector 14 is used as a heat source, so the power consumption of the air conditioning system 1A during heating is reduced and the efficiency is improved compared to when the unheated well water 191 is used as a heat source.

[0146] In this embodiment, the CPU 601 that performs the process of S103 to execute the operation pattern A for heating the first heat medium 30 is an example of the "heating control means". The heating operation performed in the operation pattern B (see FIG. 4) is an example of the "first heating operation" of the present invention. The CPU 601 that performs the process of S204 is an example of the "first heating operation means" of the present invention. The heating operation performed in the operation pattern C (see FIG. 5) is an example of the "second heating operation" of the present invention. The CPU 601 that performs the process of S302 is an example of the "second heating operation means" of the present invention. The heating operation performed in the operation pattern D (see FIG. 6) is an example of the "third heating operation" of the present invention. The CPU 601 that performs the process of S402 is an example of the "third heating operation means" of the present invention. The cooling operation performed in the operation pattern F (see FIG. 7) is an example of the "first cooling operation" of the present invention. The CPU 601 that performs the process of S502 is an example of the "first cooling operation means" of the present invention. The cooling operation performed in the operation pattern G (see FIG. 8) is an example of the "second cooling operation" of the present invention. The CPU 601 that performs the process of S602 is an example of the "second cooling operation means" of the present invention. The CPU 601 that performs the processes of 504, S510, S604, and S610 that execute the operation pattern E is an example of the "ventilation means" of the present invention. The CPU 601 that performs the process of S701 that executes the operation pattern H that supplies water is an example of the "water supply control means" of the present invention.

[0147] The heat storage tank 15 is an example of the "storage section" of the present invention. The temperature sensor 232 is an example of the "first temperature detection section" of the present invention. The temperature T of the first heat medium 30 stored in the heat storage tank 15 is an example of the "first heat medium temperature" of the present invention. The air conditioner 161 is an example of the "air conditioning section" of the present invention. The CPU 601 that performs the processes of S203, S204, S205, S301, S302, S303, S304, S402, and S403 is an example of the "heating operation switching means" of the present invention. The heat pump 12 is an example of the "heat pump section" of the present invention. The indirect heat exchanger 13 is an example of the "second heat exchange section" of the present invention. The well water 191 is an example of the "second heat medium" and "well water" of the present invention. The temperature sensor 231 is an example of the "second temperature detection section" of the present invention. The CPU 601 that performs the processes of S501, S502, S507, S602, and S607 is an example of the "cooling operation switching means" of the present invention. The temperature sensor 234 is an example of the "outdoor air temperature detection section" of the present invention. The water supply device 163 is an example of the "water supply section" of the present invention. The solar collector 14 is an example of the "heating section" of the present invention. The CPU 601 that performs the processes of S303 and S204 is an example of the "first switching means" of the present invention. The CPU 601 that performs the processes of S403 and S302 is an example of the "second switching means" of the present invention. The operation section 165 of the air conditioner 161 is an example of the "indoor temperature setting section" of the present invention. The temperature sensor 235 is an example of the "indoor temperature detection section" of the present invention.

[0148] The present invention is not limited to the above embodiment, and various modifications are possible. For example, when the heating operation pattern D (see FIG. 6) is being performed (S402 in FIG. 13), if the first heat medium 30 stored in the heat storage tank 15 is heated by the solar collector 14 and reaches the fourth temperature T4 or higher (S403 in FIG. 13: YES), the operation pattern is switched to the operation pattern C (see FIG. 5) (S302 in FIG. 12), but this is not limiting. For example, the operation pattern D does not have to be switched to the operation pattern C.

[0149] In addition, when the heating operation pattern C (see FIG. 5) is being performed (S302 in FIG. 12), if the first heat medium 30 stored in the heat storage tank 15 is heated by the solar collector 14 and reaches or exceeds the third temperature T3 (S303 in FIG. 12: YES), the operation pattern is switched to the operation pattern B (see FIG. 4) (S204 in FIG. 11), but this is not limiting. For example, the operation pattern C does not have to be switched to the operation pattern B.

[0150] In addition, when water is supplied to the air-conditioned room 16, the cooling or heating by the operation patterns B, C, D, E, F, and G is stopped, and the operation pattern H is executed (S701 in FIG. 11) to supply water, but this is not limited to the above. For example, when the amount of water supplied to the water supply device 163 is equal to or less than a predetermined amount, water may be supplied simultaneously with the heating or cooling by the operation patterns B, C, D, E, F, and G. The predetermined amount is set, for example, within a range in which the cooling or heating by the operation patterns B, C, D, E, F, and G can be performed. The predetermined amount is, for example, the difference between the amount of well water 191 that can be pumped from the pumping well 181 and the amount of water that needs to be supplied to the indirect heat exchanger 13 to operate the heat pump 12, and is, for example, 10 L / min. The amount of well water 191 that can be pumped from the pumping well 181 is, for example, set in advance and stored in the ROM 602 or the RAM 603. Furthermore, the amount of water that needs to be supplied to the indirect heat exchanger 13 for the heat pump 12 to operate may, for example, be set in advance and stored in the ROM 602 or the RAM 603, or may be calculated according to the load of the heat pump 12. For example, a flow rate sensor is provided in the flow path 704. The CPU 601 refers to the output of the flow rate sensor in the flow path 704 and detects the amount of water to be supplied to the water supply device 163. When the detected amount of water to be supplied is equal to or less than a predetermined amount, water may be supplied simultaneously with heating or cooling according to the operation patterns B, C, D, E, F, and G.

[0151] When the amount of water supplied to the water supply device 163 is equal to or less than a predetermined amount, the CPU 601 performs the operation patterns A, B, C, D, E, F, and G while opening the on-off valve 901 and driving the pump 950. As a result, water is supplied to the air-conditioned room 16 while cooling or heating is performed according to the operation patterns B, C, D, E, F, and G. When the amount of water supplied to the water supply device 163 is greater than a predetermined amount, the CPU 601 determines to stop cooling or heating according to the operation patterns B, C, D, E, F, and G, and stops the operation patterns B, C, D, E, F, and G (S206: YES, S207 in FIG. 11) (S305: YES, S306 in FIG. 12) (S404: YES, S405 in FIG. 13) (S511: YES, S512 in FIG. 14) (S611: YES, S612 in FIG. 15). Then, the CPU 601 determines to supply water (S200 in FIG. 11: YES) and executes the operation pattern H (S701 in FIG. 11). When the operation patterns B and C that do not use the well water 191 for heat exchange are being executed, water may be supplied to the air-conditioned room 16 while the operation patterns B and C are being executed even if the amount of water supply is greater than a predetermined amount.

[0152] Furthermore, although the water supply operation pattern H (see FIG. 9) is executed, the operation pattern H does not have to be executed. The well water 191 does not have to be supplied to the water supply device 163.

[0153] Furthermore, when the cooling operation patterns F and G are performed, the ventilation operation pattern E may be performed, but the ventilation operation pattern E does not have to be performed. Furthermore, the ventilation device 17 used when ventilation is performed according to the operation pattern E is a ventilation fan and an opening / closing unit, but is not limited to this. The ventilation device 17 may be either a ventilation fan or an opening / closing unit. Furthermore, the ventilation device 17 does not have to be provided.

[0154] In addition, the air conditioning system 1A can switch between a plurality of cooling operation modes according to the temperature difference T90, which is the difference between the indoor temperature T80 and the second heat medium temperature T82, but is not limited to this. The cooling operation mode does not have to be switchable. For example, only one of the cooling operation pattern F and the operation pattern G may be executed. Also, the cooling operation mode does not have to be executed.

[0155] Also, any one of the heating operation patterns B, C, and D may not be executed. In this case, the remaining two operation patterns may be switched to execute heating.

[0156] Also, the first heat medium 30 stored in the heat storage tank 15 is heated by the solar collector 14, but this is not limiting. For example, the first heat medium may be hot spring water, and the hot spring water in the heat storage tank may be warmed (i.e., heated) by newly supplying the hot spring water to the heat storage tank. Hereinafter, this modified example will be described with reference to Fig. 16. In the following description, the same components as those in Fig. 3 are denoted by the same reference numerals, and detailed description will be omitted.

[0157] As shown in FIG. 16, an air conditioning system 1B according to a modified example includes a heat storage tank 15B instead of the heat storage tank 15 (see FIG. 3). A first heat medium 30B, which is hot spring water, is stored in the heat storage tank 15B. One end of a flow path 791 and one end of a flow path 792 are connected to the heat storage tank 15B. The other end of the flow path 791 is connected to a hot spring (not shown). The other end of the flow path 792 is connected to an outlet for discharging the first heat medium 30B, which is hot spring water. A pump 965 is provided in the flow path 791.

[0158] A heat exchanger 155 is provided in the first heat medium 30B of the heat storage tank 15B. The flow path 731 and the flow path 734 are connected to the heat exchanger 155. The first liquid 301 of this embodiment is, for example, water or the above-mentioned antifreeze liquid (for example, an ethylene glycol aqueous solution or a propylene glycol aqueous solution). The first liquid 301 is different from the hot spring water that is the first heat medium 30B. The first liquid 301 of this embodiment flows inside the heat exchanger 155. The heat exchanger 155 exchanges heat between the first heat medium 30B of the heat storage tank 15B and the first liquid 301, and heats the first liquid 301. That is, the first liquid 301 is a liquid that is heated by the first heat medium 30B of the heat storage tank 15B.

[0159] In this modification, when the operation pattern A for heating the first heat medium 30B in the heat storage tank 15B, which is executed by S103 (see FIG. 10), is performed, the CPU 601 drives the pump 965. As a result, the first heat medium 30B, which is hot spring water, flows into the heat storage tank 15B via the flow path 791 and is discharged to the outside of the heat storage tank 15B via the flow path 792 (see arrow 592). The first heat medium 30B, which is hot spring water, is newly supplied to the heat storage tank 15B, thereby increasing the temperature of the first heat medium 30B stored in the heat storage tank 15B. That is, the first heat medium 30B stored in the heat storage tank 15B is heated. As a result, the first liquid 301 is heated.

[0160] In this modification, when the heating operation pattern B executed by S204 (see FIG. 11) is performed, the CPU 601 opens the on-off valves 906, 907, 912, and 913, and closes the other on-off valves 901, 902, 903, 904, 908, 909, 910, 911, and 914. The CPU 601 drives the pump 952. This causes the first liquid 301 to circulate through the heat exchanger 155, the flow paths 734, 735, and 736, the air conditioner 161, the flow paths 733, 732, and 731, and the heat exchanger 155 in the heat storage tank 15B (see arrow 591). The first liquid 301 is heated in the heat exchanger 155, and heat is extracted from the first liquid 301 in the air conditioner 161 and used for heating.

[0161] Although not shown, when the heating operation pattern C executed by S302 (see FIG. 12) is performed, the CPU 601 opens the on-off valves 904, 905, 908, 909, 910, 911, 912, and 913, and closes the other on-off valves 901, 902, 903, 906, 907, and 914. The CPU 601 drives the pumps 952 and 953. As a result, the first liquid 301 circulates through the heat exchanger 155, the flow paths 734, the flow paths 722, the flow paths 714, the heat pump 12, the flow paths 712, the flow paths 721, the flow paths 731, and the heat exchanger 155 in the heat storage tank 15B. The first liquid 301 is heated in the heat exchanger 155, and the heat pump 12 collects heat from the first liquid 301 to heat the second liquid 302. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161, and is used for heating by the air conditioner 161.

[0162] In this way, in the air conditioning system 1B, the heat derived from the first heat medium 30B, which is hot spring water, is utilized to perform heating operation. The air conditioning system 1B of this modified example achieves the same effects as the air conditioning system 1A.

[0163] In this modification, the pump 952 that sends the first heat medium 30B, which is hot spring water, to the heat storage tank 15B and heats the first heat medium 30B stored in the heat storage tank 15B is an example of the "heating section" of the present invention.

[0164] Also, well water 191 is sent to the indirect heat exchanger 13 to extract cold heat, but this is not limiting. For example, a medium cooled by a geothermal heat exchanger may be sent to the indirect heat exchanger 13 to extract cold heat. Even in this case, the temperature of the medium cooled by the geothermal heat exchanger is unlikely to change, as in the case of well water 191, so that the same effect as the air conditioning systems 1A and 1B is achieved. Hereinafter, this modified example will be described with reference to FIG. 17. In the following description, the same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description will be omitted.

[0165] As shown in FIG. 17, the air conditioning system 1C according to the modified example includes a geothermal heat exchanger 196 instead of the pumping well 181 and the reinjection well 182 (see FIG. 3). The geothermal heat exchanger 196 is provided facing the lower side of the ground surface 105. One end of the geothermal heat exchanger 196 is connected to a flow path 798 connected to the indirect heat exchanger 13. The other end of the geothermal heat exchanger 196 is connected to a flow path 799 connected to the indirect heat exchanger 13. The flow path 798 is provided with a pump 966 and a temperature sensor 239. A second heat medium 197 circulates in the geothermal heat exchanger 196, the flow path 798, the indirect heat exchanger 13, and the flow path 799. The second heat medium 197 in this embodiment is a medium that is heat exchanged with geothermal heat in the geothermal heat exchanger 196. The second heat medium 197 is, for example, water or a refrigerant. The coolant is, for example, an antifreeze (for example, an ethylene glycol aqueous solution, a propylene glycol aqueous solution).

[0166] The temperature sensor 239 detects the temperature of the second heat medium 197 in the flow path 798. The CPU 601 detects the temperature of the second heat medium 197 in the flow path 798 based on a signal output from the temperature sensor 239. The detected temperature of the second heat medium 197 in the flow path 798 becomes the second heat medium temperature T82 in the above-mentioned embodiment. The second heat medium temperature T82 is used when a temperature difference T90, which is the difference between the indoor temperature T80 and the second heat medium temperature T82, is calculated in S501 (see FIG. 14), S507 (see FIG. 14), and S607 (see FIG. 15).

[0167] In addition, in the air conditioning system 1C, the flow path 704 and the water supply device 163 (see FIG. 1) are not provided. Therefore, the processes of S200 and S701 to S703 (see FIG. 11) do not have to be executed. In the case where S200 and S701 to S703 are not executed, when the operation switching process is started, the process of S201 may be performed first. Furthermore, all processes returning to S200 may return to S201. Furthermore, the opening and closing valve 914 (see FIG. 1) is not provided.

[0168] In this modification, when the cooling operation pattern F executed by S502 (see FIG. 14) is performed, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, and 907, and closes the other on-off valves 908, 909, 910, 911, 912, and 913. The CPU 601 drives the pumps 951 and 996. This causes the second heat medium 197 to circulate through the underground heat exchanger 196, the flow path 798, the indirect heat exchanger 13, the flow path 799, and the underground heat exchanger 196 (see the arrow 595). In the underground heat exchanger 196, the second heat medium 197 is cooled by heat exchange between the underground heat and the second heat medium 197. The cooled second heat medium 197 is sent to the indirect heat exchanger 13, where cold heat is extracted, and the fourth liquid 304 is cooled. The fourth liquid 304 circulates between the indirect heat exchanger 13 and the air conditioner 161 (see arrow 596 ) and is used for cooling by the air conditioner 161 .

[0169] Although not shown, when the cooling operation pattern G executed by S602 (see FIG. 15) is performed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, and 911 and closes the other on-off valves 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 951, 953, and 966. This causes the second heat medium 197 to circulate through the underground heat exchanger 196, the flow path 798, the indirect heat exchanger 13, the flow path 799, and the underground heat exchanger 196. In the underground heat exchanger 196, the second heat medium 197 is cooled by heat exchange between the underground heat and the second heat medium 197. In the indirect heat exchanger 13, cold heat is collected from the second heat medium 197, and the third liquid 303 (similar to FIG. 8) is cooled. A third liquid 303 circulates between the indirect heat exchanger 13 and the heat pump 12 (similar to arrow 572 in FIG. 8).

[0170] In the heat pump 12, cold heat is extracted from the third liquid 303, and the second liquid 302 is cooled. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161, and is used for cooling by the air conditioner 161. In this way, the cold heat derived from the second heat medium 197, which is the medium that exchanges heat with the geothermal heat, is used to perform heating.

[0171] Although not shown, when the heating operation pattern D executed by S402 (see FIG. 13) is performed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, and 911 and closes the other on-off valves 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 951, 953, and 966. This causes the second heat medium 197 to circulate through the underground heat exchanger 196, the flow path 798, the indirect heat exchanger 13, the flow path 799, and the underground heat exchanger 196. In the underground heat exchanger 196, the second heat medium 197 is heated by heat exchange between the underground heat and the second heat medium 197. In the indirect heat exchanger 13, heat is collected from the second heat medium 197, and the third liquid 303 (similar to FIG. 6) is heated. A third liquid 303 circulates between the indirect heat exchanger 13 and the heat pump 12 (similar to arrow 542 in FIG. 6).

[0172] In the heat pump 12, heat is extracted from the third liquid 303, and the second liquid 302 (similar to FIG. 6) is heated. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161, and is used for heating by the air conditioner 161. In this manner, heat derived from the second heat medium 197, which is a medium that exchanges heat with geothermal heat, is used to perform heating. The operation patterns A, B, and C are also executed in the same manner as the air conditioning systems 1A and 1B. The air conditioning system 1C of this modified example achieves the same effects as the air conditioning systems 1A and 1B. Also in this modified example, the heat storage tank 15 may be replaced with the heat storage tank 15B (see FIG. 16), and a heat exchange section 155 may be provided.

[0173] In this modification, the temperature sensor 239 is an example of the "second temperature detection unit" of the present invention. The second heat medium 197 which is a medium that exchanges heat with geothermal heat is an example of the "second heat medium" of the present invention.

[0174] In addition, when the underground heat exchanger 196 is provided, the indirect heat exchanger 13 (see FIG. 17) may not be provided as in the air conditioning system 1D according to the modified example shown in FIG. 18. When the underground heat exchanger 196 is used, the possibility of impurities being mixed is low compared to the well water 191, so even if the second heat medium 197 is directly supplied to the heat pump 12 and the air conditioner 161, the possibility of the heat pump 12 and the air conditioner 161 being broken down due to impurities is low. In this case, the pump 951 (see FIG. 17) is not required. The flow path 711 is connected to one end of the underground heat exchanger 196, and the flow path 713 is connected to the other end of the underground heat exchanger 196. The pump 966 and the temperature sensor 239 are provided in the flow path 711. In this modified example, the second heat medium 197 is a medium that is heat exchanged with underground heat. The second heat medium 197 is, for example, water or a refrigerant. The refrigerant is, for example, an antifreeze liquid (for example, an ethylene glycol aqueous solution or a propylene glycol aqueous solution). The second heat medium 197, the first heat medium 30 stored in the heat storage tank 15, and the first liquid 301 are the same medium.

[0175] In this modification, when the indoor temperature T80 is higher than the second heat medium temperature T82, and the temperature difference T90 between the indoor temperature T80 and the second heat medium temperature T82 is larger than a predetermined temperature difference T91 (S501: YES in FIG. 14 or S607: YES in FIG. 15), the cooling operation pattern F is executed (S502 in FIG. 14). In this modification, when the operation pattern F is executed, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, and 907 and closes the other on-off valves 908, 909, 910, 911, 912, and 913, as shown in FIG. 18. The CPU 601 drives the pump 966. As a result, the second heat medium 197 circulates through the geothermal heat exchanger 196, flow path 711, flow path 721, flow path 732, flow path 733, the air conditioner 161, flow path 736, flow path 735, flow path 722, flow path 713, and the geothermal heat exchanger 196 (see arrow 597). In the geothermal heat exchanger 196, the second heat medium 197 is cooled by heat exchange between the geothermal heat and the second heat medium 197. The cooled second heat medium 197 is sent to the air conditioner 161. In the air conditioner 161, the second heat medium 197 is used as a heat source to perform cooling.

[0176] In this modification, when the indoor temperature T80 is higher than the second heat medium temperature T82 and the temperature difference T90 between the indoor temperature T80 and the second heat medium temperature T82 is equal to or smaller than the predetermined temperature difference T91 (NO in S501 or NO in S507 of FIG. 14), the cooling operation pattern G is executed (S602 in FIG. 15). In this modification, when the operation pattern G is executed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, and 911 and closes the other on-off valves 904, 905, 906, 907, 912, and 913, as shown in FIG. 19. The CPU 601 drives the pumps 953 and 966. As a result, the second heat medium 197 circulates through the geothermal heat exchanger 196, the flow path 711, the flow path 712, the heat pump 12, the flow path 714, the flow path 713, and the geothermal heat exchanger 196 (see arrow 598). The second liquid 302 circulates between the heat pump 12 and the air conditioner 161 (see arrow 599).

[0177] In the geothermal heat exchanger 196, heat is exchanged between the geothermal heat and the second heat medium 197, and the second heat medium 197 is cooled. In the heat pump 12, heat is exchanged between the second heat medium 197 and the second liquid 302, and the second liquid 302 is cooled. The cooled second liquid 302 is sent to the air conditioner 161. In the air conditioner 161, the second liquid 302 is used as a heat source to perform cooling.

[0178] When the cooling operation pattern F (see FIG. 18) is performed in this modified example, the cold energy derived from the second heat medium 197 is directly supplied to the air conditioner 161 to cool the air-conditioned room 16. In the cooling operation pattern G (see FIG. 19), the cold energy derived from the second heat medium 197 is supplied to the air conditioner 161 via the heat pump 12 to cool the air-conditioned room 16. For this reason, the indirect heat exchanger 13 is not used for cooling. Therefore, for example, the cost of the air conditioning system 1D can be reduced compared to when both the indirect heat exchanger 13 and the heat pump 12 are provided.

[0179] Furthermore, when the cooling operation pattern F (see FIG. 18) is performed, the second heat medium 197 is directly supplied to the air conditioner 161 to perform air conditioning. Therefore, compared to when the indirect heat exchanger 13 is provided between the underground heat exchanger 196 and the air conditioner 161, thermal energy is not consumed in the indirect heat exchanger 13, and the efficiency of transferring heat to the air conditioner 161 is improved. Furthermore, when the cooling operation pattern G (see FIG. 19) is performed, the second heat medium 197 is directly supplied to the heat pump 12 to exchange heat. Therefore, compared to when the indirect heat exchanger 13 is provided between the underground heat exchanger 196 and the heat pump 12, thermal energy is not consumed in the indirect heat exchanger 13, and the efficiency of transferring heat to the air conditioner 161 is improved.

[0180] Also, when the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the second temperature T2 (S301: NO in FIG. 12 or S304: YES in FIG. 12), the heating operation pattern D is executed (S402 in FIG. 13). As shown in FIG. 19, when the operation pattern D is executed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, and 911 and closes the other on-off valves 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 953 and 966. As a result, the second heat medium 197 circulates between the underground heat exchanger 196 and the heat pump 12 (see arrow 598) in the same manner as in the cooling operation pattern G. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161 (see arrow 599).

[0181] In the geothermal heat exchanger 196, heat is exchanged between the geothermal heat and the second heat medium 197, and the second heat medium 197 is heated. In the heat pump 12, heat is exchanged between the second heat medium 197 and the second liquid 302, and the second liquid 302 is heated. The heated second liquid 302 is sent to the air conditioner 161. The second liquid 302 is used as a heat source in the air conditioner 161 to perform heating. In this manner, when the operation pattern D is performed in this modified example, heat derived from the second heat medium 197 is supplied to the air conditioner 161 via the heat pump 12, and the air-conditioned room 16 is heated. For this reason, the indirect heat exchanger 13 is not used for heating. Therefore, for example, the cost of the air conditioning system 1D can be reduced compared to a case in which both the indirect heat exchanger 13 and the heat pump 12 are provided. In addition, the second heat medium 197 is directly supplied to the heat pump 12 to perform heat exchange. Therefore, compared to the case where an indirect heat exchanger 13 is provided between the underground heat exchanger 196 and the heat pump 12, thermal energy is not consumed in the indirect heat exchanger 13, and the efficiency of transferring heat to the air conditioner 161 is improved.

[0182] The operation patterns A, B, C, and E are executed in the same manner as the air conditioning systems 1A, 1B, and 1C. The air conditioning system 1D of this modification achieves the same effects as the air conditioning systems 1A, 1B, and 1C. Also in this modification, the heat storage tank 15 may be replaced with the heat storage tank 15B (see FIG. 16), and a heat exchanger 155 may be provided.

[0183] In this modification, the underground heat exchanger 196 is an example of the "underground heat exchange section" of the present invention.

[0184] Furthermore, if the well water 191 contains few impurities, the well water 191 may be supplied to the heat pump 12 as in the air conditioning system 1E shown in Fig. 20. The well water 191 contains few impurities when, for example, the water quality of the well water 191 meets the standards of the Japan Refrigeration and Air Conditioning Industry Association standard JRA-GL-02-1994.

[0185] In Fig. 20, the same components as those in Fig. 1 are indicated by the same reference numerals, and detailed description thereof will be omitted. In the air conditioning system 1E, the indirect heat exchanger 13 (see Fig. 1) and the pump 951 (see Fig. 1) are not provided. One end of a flow path 788 is connected to a branching portion 801, and the other end is connected to a branching portion 802. One end of a flow path 789 is connected to a branching portion 803, and the other end is disposed in the well water 191 of the reinjection well 182. An on-off valve 902 is provided in the flow path 788, and an on-off valve 903 is provided in the flow path 789. An on-off valve 914 (see Fig. 1) is not provided.

[0186] The first heat medium 30, the first liquid 301, and the second liquid 302 in the air conditioning system 1E are the same liquid as the well water 191. In this embodiment, the well water 191 is the second heat medium.

[0187] In this modification, when the indoor temperature T80 is higher than the second heat medium temperature T82, and the temperature difference T90 between the indoor temperature T80 and the second heat medium temperature T82 is larger than a predetermined temperature difference T91 (S501: YES in FIG. 14 or S607: YES in FIG. 15), the cooling operation pattern F is executed (S502 in FIG. 14). In this modification, when the operation pattern F is executed, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, and 907 and closes the other on-off valves 901, 908, 909, 910, 911, 912, and 913, as shown in FIG. 20. The CPU 601 drives the pump 950. As a result, well water 191, which is the second heat medium, flows through pumping well 181, flow path 701, flow path 788, flow path 721, flow path 732, flow path 733, air conditioner 161, flow path 736, flow path 735, flow path 722, and flow path 789 to return well 182 (see arrow 997). In air conditioner 161, well water 191, which is the second heat medium, is used as a heat source to perform cooling.

[0188] In this modification, when the indoor temperature T80 is higher than the second heat medium temperature T82 and the temperature difference T90 between the indoor temperature T80 and the second heat medium temperature T82 is equal to or smaller than the predetermined temperature difference T91 (S501: NO in FIG. 14 or S507: NO), the cooling operation pattern G is executed (S602 in FIG. 15). In this modification, when the operation pattern G is executed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, and 911 and closes the other on-off valves 901, 904, 905, 906, 907, 912, and 913, as shown in FIG. 21. The CPU 601 drives the pumps 950 and 953. As a result, well water 191, which is the second heat medium, flows through the pumping well 181, flow path 701, flow path 788, flow path 712, heat pump 12, flow path 714, and flow path 789 to the return well 182 (see arrow 998). The second liquid 302 circulates between the heat pump 12 and the air conditioner 161 (see arrow 999).

[0189] In the heat pump 12, heat is exchanged between the well water 191, which is the second heat medium, and the second liquid 302, and the second liquid 302 is cooled. The cooled second liquid 302 is sent to the air conditioner 161. In the air conditioner 161, the second liquid 302 is used as a heat source to perform cooling.

[0190] When the cooling operation pattern F (see FIG. 20) is performed in this modified example, the cold energy derived from the well water 191, which is the second heat medium, is directly supplied to the air conditioner 161 to cool the air-conditioned room 16. In the cooling operation pattern G (see FIG. 21), the cold energy derived from the well water 191, which is the second heat medium, is supplied to the air conditioner 161 via the heat pump 12 to cool the air-conditioned room 16. For this reason, the indirect heat exchanger 13 is not used for cooling. Therefore, for example, the cost of the air conditioning system 1E can be reduced compared to when both the indirect heat exchanger 13 and the heat pump 12 are provided.

[0191] Moreover, when the cooling operation pattern F (see FIG. 20) is performed, well water 191, which is the second heat medium, is directly supplied to the air conditioner 161 to perform air conditioning. Therefore, compared to when an indirect heat exchanger 13 is provided between the pumping well 181, which is the supply source of the well water 191, and the air conditioner 161, thermal energy is not consumed in the indirect heat exchanger 13, and the efficiency of transferring heat to the air conditioner 161 is improved. Furthermore, when the cooling operation pattern G (see FIG. 21) is performed, well water 191, which is the second heat medium, is directly supplied to the heat pump 12 and heat exchanged. Therefore, compared to when an indirect heat exchanger 13 is provided between the pumping well 181, which is the supply source of the well water 191, and the heat pump 12, thermal energy is not consumed in the indirect heat exchanger 13, and the efficiency of transferring heat to the air conditioner 161 is improved.

[0192] Also, when the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the second temperature T2 (S301: NO in FIG. 12 or S304: YES in FIG. 12), the heating operation pattern D is executed (S402 in FIG. 13). As shown in FIG. 19, when the operation pattern D is executed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, and 911 and closes the other on-off valves 901, 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 950 and 953. As a result, like the cooling operation pattern G, the well water 191, which is the second heat medium, flows from the pumping well 181 through the heat pump 12 to the return well 182 (see arrow 998). The second liquid 302 circulates between the heat pump 12 and the air conditioner 161 (see arrow 999).

[0193] In the heat pump 12, heat is exchanged between the well water 191, which is the second heat medium, and the second liquid 302, and the second liquid 302 is heated. The heated second liquid 302 is sent to the air conditioner 161. The air conditioner 161 uses the second liquid 302 as a heat source to perform heating. In this manner, when the operation pattern D is performed in this modification, heat derived from the well water 191, which is the second heat medium, is supplied to the air conditioner 161 via the heat pump 12, and the air-conditioned room 16 is heated. For this reason, the indirect heat exchanger 13 is not used for heating. Therefore, for example, the cost of the air conditioning system 1E can be reduced compared to when both the indirect heat exchanger 13 and the heat pump 12 are provided. In addition, the well water 191, which is the second heat medium, is directly supplied to the heat pump 12 and heat exchanged. Therefore, compared to a case where an indirect heat exchanger 13 is provided between the pumping well 181, which is the source of the well water 191, and the heat pump 12, thermal energy is not consumed in the indirect heat exchanger 13, and the efficiency of transferring heat to the air conditioner 161 is improved.

[0194] The operation patterns A, B, C, and E are also executed in the same manner as the air conditioning systems 1A, 1B, 1C, and 1D. The operation pattern H is also executed in the same manner as the air conditioning systems 1A and 1B. By executing the operation pattern H, it is possible to supply well water 191 to the air-conditioned room 16. Furthermore, the air conditioning system 1E of this modified example achieves the same effects as the air conditioning systems 1A, 1B, 1C, and 1D. Also, in this modified example, the heat storage tank 15 may be replaced with the heat storage tank 15B (see FIG. 16), and a heat exchanger 155 may be provided.

[0195] In addition, when water is supplied to the air-conditioned room 16, the cooling or heating by the operation patterns B, C, D, E, F, and G is stopped, and the operation pattern H is executed (S701 in FIG. 11) to supply water, but this is not limited to this in the present modified example. For example, when the amount of water supplied to the water supply device 163 is equal to or less than a predetermined amount, water may be supplied simultaneously with the heating or cooling by the operation patterns B, C, D, E, F, and G. The predetermined amount is set, for example, within a range in which the cooling or heating by the operation patterns B, C, D, E, F, and G can be performed. As an example, the predetermined amount is the difference between the amount of well water 191 that can be pumped from the pumping well 181 and the amount of water that needs to be supplied to the heat pump 12 to operate the heat pump 12, and is, for example, 10 L / min. The amount of well water 191 that can be pumped from the pumping well 181 is set in advance, for example, and stored in the ROM 602 or the RAM 603. Furthermore, the amount of water that needs to be supplied to heat pump 12 for heat pump 12 to operate may, for example, be set in advance and stored in ROM 602 or RAM 603, or may be calculated according to the load of heat pump 12. For example, a flow rate sensor is provided in flow path 704. CPU 601 refers to the output of the flow rate sensor in flow path 704 and detects the amount of water to be supplied to water supply device 163. When the detected amount of water to be supplied is equal to or less than a predetermined amount, water may be supplied simultaneously with heating or cooling according to operation patterns B, C, D, E, F, and G.

[0196] Also, an indirect heat exchanger 131 may be provided as in an air conditioning system 1F shown in FIG. 22. In FIG. 22, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the air conditioning system 1F, the pump 951 and the pump 953 (see FIG. 1) are not provided. The air conditioning system 1F includes pumps 954 and 955. In the flow path 712, the pump 954 is provided between the on-off valve 910 and the heat pump 12. The pump 955 is provided in the flow path 736.

[0197] One end of the flow path 771 is connected to the heat storage tank 15, and the other end is connected to the indirect heat exchanger 131. The flow path 771 is connected to one end of the flow path 772 via a flow path in the indirect heat exchanger 131. The other end of the flow path 772 is connected to the heat storage tank 15. The pump 952 is provided in the flow path 772. One end of the flow path 773 is connected to the branching section 804, and the other end is connected to the indirect heat exchanger 131. The flow path 773 is connected to one end of the flow path 774 via a flow path in the indirect heat exchanger 131. The other end of the flow path 774 is connected to the branching section 805. The opening / closing valve 912 is provided in the flow path 773, and the opening / closing valve 913 is provided in the flow path 774.

[0198] In this modification, when the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the first temperature T1 (S203: YES in FIG. 11), the heating operation pattern B is executed (S204 in FIG. 11). When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the first temperature T1 (S203: NO in FIG. 11 or S205: YES in FIG. 11), the heating operation pattern C is executed (S302 in FIG. 12). In this case, the operation pattern is switched between the operation pattern B (see FIG. 22) and the operation pattern C (see FIG. 23) depending on the temperature T of the first heat medium 30 stored in the heat storage tank 15.

[0199] In the following description, the first liquid 301 is the first heat medium 30 itself. The fifth liquid 305 is a liquid between the indirect heat exchanger 131 and the air conditioner 161. The sixth liquid 306 is a liquid between the indirect heat exchanger 131 and the heat pump 12. The first heat medium 30, the first liquid 301, the second liquid 302, the third liquid 303, the fourth liquid 304, the fifth liquid 305, and the sixth liquid 306 are the same medium, and an example of the liquid is an antifreeze liquid (e.g., an ethylene glycol aqueous solution, a propylene glycol aqueous solution). The first heat medium 30 and the first liquid 301 may be different liquids from the second liquid 302, the third liquid 303, the fourth liquid 304, the fifth liquid 305, and the sixth liquid 306.

[0200] In this modification, when the heating operation pattern B is performed, as shown in FIG. 22, the CPU 601 opens the on-off valves 906, 907, 912, and 913 and closes the other on-off valves 901, 902, 903, 904, 905, 908, 909, 910, 911, and 914. The CPU 601 drives the pumps 952 and 955. As a result, the first liquid 301 flows from the heat storage tank 15 through the flow path 772, the indirect heat exchanger 131, and the flow path 771 to the heat storage tank 15 (see arrow 981). The fifth liquid 305 circulates through the indirect heat exchanger 131, the flow path 774, the flow path 735, the flow path 736, the air conditioner 161, the flow path 733, the flow path 732, the flow path 773, and the indirect heat exchanger 131 (see arrow 982).

[0201] In the indirect heat exchanger 131, heat is extracted from the first liquid 301 by indirect heat exchange, and the fifth liquid 305 is heated. The heat of the heated fifth liquid 305 is used in the air conditioner 161 to heat the air-conditioned room 16.

[0202] In this modification, when the heating operation pattern C is performed, as shown in FIG. 23, the CPU 601 opens the on-off valves 904, 905, 908, 909, 910, 911, 912, and 913, and closes the other on-off valves 901, 902, 903, 906, 907, and 914. The CPU 601 drives the pumps 952, 954, and 955. As a result, the first liquid 301 flows from the heat storage tank 15 through the flow path 772, the indirect heat exchanger 131, and the flow path 771 to the heat storage tank 15 (see arrow 983). The sixth liquid 306 circulates through the indirect heat exchanger 131, the flow path 774, the flow path 722, the flow path 714, the heat pump 12, the flow path 712, the flow path 721, the flow path 773, and the indirect heat exchanger 131 (see arrow 984). The second liquid 302 circulates through the heat pump 12, the flow path 742, the flow path 736, the air conditioner 161, the flow path 733, the flow path 741, and the heat pump 12 (see arrow 985).

[0203] In the indirect heat exchanger 131, heat is extracted from the first liquid 301 by indirect heat exchange, and the sixth liquid 306 is heated. In the heat pump 12, heat is extracted from the sixth liquid 306 by a heat pump method, and the second liquid 302 is heated. The heat of the heated second liquid 302 is utilized in the air conditioner 161 to heat the air-conditioned room 16.

[0204] Although not shown, in the air conditioning system 1F, when the heating operation pattern D is performed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, 911, and 914, and closes the other on-off valves 901, 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 950, 954, and 955. As in the case shown in FIG. 6, the well water 191 flows from the pumping well 181 to the return well 182 through the indirect heat exchanger 13. The third liquid 303 circulates between the indirect heat exchanger 13 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161. In the indirect heat exchanger 13, heat is collected from the well water 191 by indirect heat exchange, and the third liquid 303 is heated. In the heat pump 12, heat is extracted from the third liquid 303, and the second liquid 302 is heated. The heat of the heated second liquid 302 is utilized in the air conditioner 161 to heat the air-conditioned room 16.

[0205] As shown in FIG. 24, when the cooling operation pattern F is performed, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, 907, and 914, and closes the other on-off valves 901, 908, 909, 910, 911, 912, and 913. The CPU 601 drives the pumps 950 and 955. As a result, the well water 191 flows from the pumping well 181 to the return well 182 through the indirect heat exchanger 13 (see arrow 986). The fourth liquid 304 circulates through the indirect heat exchanger 13, the flow path 713, the flow path 722, the flow path 735, the flow path 736, the air conditioner 161, the flow path 733, the flow path 732, the flow path 721, the flow path 711, and the indirect heat exchanger 13 (see arrow 987). In the indirect heat exchanger 13, cold energy is extracted from the well water 191 by indirect heat exchange, and the fourth liquid 304 is cooled. The cold energy of the cooled fourth liquid 304 is used in the air conditioner 161 to cool the air-conditioned room 16.

[0206] Although not shown, in the air conditioning system 1F, when the cooling operation pattern G is performed, the CPU 601 opens the on-off valves 902, 903, 908, 909, 910, 911, and 914, and closes the other on-off valves 901, 904, 905, 906, 907, 912, and 913. The CPU 601 drives the pumps 950, 954, and 955. As in the case shown in FIG. 8, the well water 191 flows from the pumping well 181 to the return well 182 through the indirect heat exchanger 13. The third liquid 303 circulates between the indirect heat exchanger 13 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161. In the indirect heat exchanger 13, cold heat is collected from the well water 191 by indirect heat exchange, and the third liquid 303 is cooled. In the heat pump 12, cold energy is extracted from the third liquid 303, and the second liquid 302 is cooled. The cold energy of the cooled second liquid 302 is used in the air conditioner 161 to cool the air-conditioned room 16.

[0207] In this modification, an indirect heat exchanger 131 is provided that extracts heat from the first liquid 301 by heat exchange. When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is higher than the first temperature T1 (S203: YES in FIG. 11), the heating operation pattern B is executed (S204 in FIG. 11). When the temperature T of the first heat medium 30 stored in the heat storage tank 15 is equal to or lower than the first temperature T1 (S203: NO in FIG. 11 or S205: YES in FIG. 11), the heating operation pattern C is executed (S302 in FIG. 12). In the operation pattern B, the fifth liquid 305 is heated by heat exchange between the first liquid 301 and the fifth liquid 305 in the indirect heat exchanger 131, and the fifth liquid 305 is used as a heat source to perform heating in the air conditioner 161 (see FIG. 22). In operating pattern C, heat is exchanged between the first liquid 301 and the sixth liquid 306 in the indirect heat exchanger 131 to heat the sixth liquid 306, heat is exchanged between the sixth liquid 306 and the second liquid 302 in the heat pump 12 to heat the second liquid 302, and heating is performed in the air conditioner 161 using the second liquid 302 as a heat source (see Figure 23).

[0208] In this way, when operation pattern B is performed, heat derived from the first heat medium 30 is supplied to the air conditioner 161 via the indirect heat exchanger 131, and the air-conditioned room 16 is heated. When operation pattern C is performed, heat derived from the first heat medium 30 is supplied to the air conditioner 161 via the indirect heat exchanger 131 and the heat pump 12, and the air-conditioned room 16 is heated. Since the indirect heat exchanger 131 is provided, the first liquid 301 is not directly supplied to the heat pump 12. Therefore, for example, even if the first liquid 301 contains impurities, the possibility that the heat pump 12 will break down due to the influence of the impurities can be reduced.

[0209] The operation patterns A and E are also executed in the same manner as the air conditioning systems 1A, 1B, 1C, 1D, and 1E. The operation pattern H is also executed in the same manner as the air conditioning systems 1A, 1B, and 1E. By executing the operation pattern H, it is possible to supply well water 191 to the air-conditioned room 16. Furthermore, the air conditioning system 1F of this modified example achieves the same effects as the air conditioning systems 1A, 1B, 1C, 1D, and 1E. Furthermore, in this modified example as well, the heat storage tank 15 may be replaced with the heat storage tank 15B (see FIG. 16), and a heat exchanger 155 may be provided.

[0210] Also, as shown in FIG. 24, when the cooling operation pattern F is performed, the well water 191 and the fourth liquid 304 flow in the same direction (from the bottom to the top of the paper) in the indirect heat exchanger 13 in a parallel flow, but this is not limited thereto. For example, the pump 955 is a pump capable of flowing liquid in one direction and in a direction opposite to the one direction. Then, when the cooling operation pattern F is performed, the direction in which the pump 955 flows the fourth liquid 304 is opposite to the arrow 987. In this case, in the indirect heat exchanger 13, the fourth liquid 304 flows in a direction from the top to the bottom of the paper, and the well water 191 flows in a direction from the bottom to the top of the paper. That is, in the indirect heat exchanger 13, the well water 191 and the fourth liquid 304 flow in opposite directions to each other in a counter flow. In the case of a counter flow, the efficiency of transferring cold energy from the well water 191 to the fourth liquid 304 is improved compared to a parallel flow. Therefore, the efficiency of cooling is improved. In all the embodiments, when the indirect heat exchanger 13, 131 is used, counter flow or parallel flow may be used. All the pumps 950, 951, 952, 953, 954, 955 may be pumps capable of flowing liquid in one direction and in the direction opposite to the one direction. In addition, when the operation patterns B, C, D, F, G are executed, when the indirect heat exchanger 13, 131 is used, counter flow may be used.

[0211] In this modification, the indirect heat exchanger 131 is an example of the "first heat exchange section" of the present invention.

[0212] Incidentally, even when an indirect heat exchanger 131 is used, the various modifications described above may be made. An air conditioning system 1G shown in Fig. 25 is equipped with an underground heat exchanger 196, similar to Fig. 17, instead of the pumping well 181 and the return well 182 of the air conditioning system 1F (see Fig. 24). The same components as those in the above-mentioned embodiments are indicated by the same reference numerals, and detailed explanations will be omitted (the same applies to air conditioning systems 1H and 1J described later).

[0213] As shown in FIG. 25, when the operation pattern F is executed in the air conditioning system 1G, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, and 907, and closes the other on-off valves 908, 909, 910, 911, 912, and 913. The CPU 601 drives the pumps 955 and 966. As a result, the second heat medium 197 circulates between the underground heat exchanger 196 and the indirect heat exchanger 13 (see arrow 971). The fourth liquid 304 circulates between the indirect heat exchanger 13 and the air conditioner 161 (see arrow 972). In the indirect heat exchanger 13, cold energy is collected from the second heat medium 197 by indirect heat exchange, and the fourth liquid 304 is cooled. The cold energy of the cooled fourth liquid 304 is used in the air conditioner 161 to cool the air-conditioned room 16. The direction in which the pump 955 flows the fourth liquid 304 is opposite to that in FIG. 24, but may be the same as that in FIG.

[0214] The operation patterns A, B, C, D, E, and G are also executed in the same manner as the air conditioning systems 1C and 1F. Although not shown, when the operation pattern B is executed, the first liquid 301 circulates between the heat storage tank 15 and the indirect heat exchanger 131, as in FIG. 22. The fifth liquid 305 circulates between the indirect heat exchanger 131 and the air conditioner 161. When the operation pattern C is executed, the first liquid 301 circulates between the heat storage tank 15 and the indirect heat exchanger 131, as in FIG. 23. The sixth liquid 306 circulates between the indirect heat exchanger 131 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161. When the operation pattern D or the operation pattern G is executed, the second heat medium 197 circulates between the underground heat exchanger 196 and the indirect heat exchanger 13. The third liquid 303 circulates between the indirect heat exchanger 13 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161.

[0215] An air conditioning system 1H shown in Fig. 26 is configured by replacing the pumping well 181 and the return well 182 of the air conditioning system 1F (see Fig. 24) with a geothermal heat exchanger 196 as in Fig. 18, and eliminating the indirect heat exchanger 13. A pump 966 draws up a second heat medium 197 from the geothermal heat exchanger 196 that is provided facing underground. Since the second heat medium 197 is drawn up from the geothermal heat exchanger 196 that is at a height difference, the pump 966 has a larger head than the pumps 954 and 955.

[0216] As shown in FIG. 26, when the operation pattern F is executed in the air conditioning system 1H, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, and 907, and closes the other on-off valves 908, 909, 910, 911, 912, and 913. The CPU 601 drives the pump 951. As a result, the second heat medium 197 circulates between the underground heat exchanger 196 and the air conditioner 161 (see arrow 973). The cold energy of the second heat medium 197 is utilized, and the air conditioner 161 cools the air-conditioned room 16. Since the second heat medium 197 is circulated by driving the pump 966, the pump 955 does not need to be driven. Note that both the pumps 955 and 966 may be driven to circulate the second heat medium 197.

[0217] The operation patterns A, B, C, D, E, and G are also executed in the same manner as the air conditioning systems 1D and 1F. Although not shown, when the operation pattern B is executed, the first liquid 301 circulates between the heat storage tank 15 and the indirect heat exchanger 131, as in FIG. 22. The fifth liquid 305 circulates between the indirect heat exchanger 131 and the air conditioner 161. When the operation pattern C is executed, the first liquid 301 circulates between the heat storage tank 15 and the indirect heat exchanger 131, as in FIG. 23. The sixth liquid 306 circulates between the indirect heat exchanger 131 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161. When the operation pattern D or the operation pattern G is executed, the second heat medium 197 circulates between the underground heat exchanger 196 and the heat pump 12 by driving the pump 954, as in FIG. 19. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161. When the operation patterns D and G are executed, the second heat medium 197 is circulated by driving the pump 966, so that the pump 954 does not need to be driven. Note that both the pumps 954 and 966 may be driven to circulate the second heat medium 197.

[0218] An air conditioning system 1J shown in Fig. 27 is one in which the indirect heat exchanger 13 of the air conditioning system 1F has been deleted, as in Fig. 20. A pump 950 draws up well water 191 from a pumping well 181 that is provided underground. Since the well water 191 is drawn up from the pumping well 181 that is at a different elevation, the pump 950 has a larger head than the pumps 954 and 955.

[0219] As shown in FIG. 27, when the operation pattern F is executed in the air conditioning system 1J, the CPU 601 opens the on-off valves 902, 903, 904, 905, 906, and 907, and closes the other on-off valves 901, 908, 909, 910, 911, 912, and 913. The CPU 601 drives the pump 950. This causes the well water 191 to flow from the pumping well 181 through the air conditioner 161 to the return well 182 (see arrow 974). The cold energy of the well water 191 is utilized, and the air conditioner 161 cools the air-conditioned room 16. Since the well water 191 is circulated by driving the pump 950, the pump 955 does not need to be driven. Note that both the pumps 950 and 954 may be driven to circulate the second heat medium 197.

[0220] The operation patterns A, B, C, D, E, G, and H are also executed in the same manner as the air conditioning systems 1E and 1F. Although not shown, when the operation pattern B is executed, the first liquid 301 circulates between the heat storage tank 15 and the indirect heat exchanger 131, as in FIG. 22. The fifth liquid 305 circulates between the indirect heat exchanger 131 and the air conditioner 161. When the operation pattern C is executed, the first liquid 301 circulates between the heat storage tank 15 and the indirect heat exchanger 131, as in FIG. 23. The sixth liquid 306 circulates between the indirect heat exchanger 131 and the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161. When the operation pattern D or the operation pattern G is executed, the well water 191 is pumped from the pumping well 181 by driving the pump 950, as in FIG. 21, and flows to the return well 182 via the heat pump 12. The second liquid 302 circulates between the heat pump 12 and the air conditioner 161. When the operation patterns D and G are executed, the well water 191 is circulated by driving the pump 950, so that the pump 954 does not need to be driven. Note that both the pumps 950 and 954 may be driven to circulate the second heat medium 197.

[0221] The air conditioning systems 1G, 1H, and 1J have the same effects as the air conditioning systems 1A, 1B, 1C, 1D, 1E, and 1F. Also, in the air conditioning systems 1G, 1H, and 1J, the heat storage tank 15 may be replaced with the heat storage tank 15B (see FIG. 16), and a heat exchanger 155 may be provided. [Explanation of symbols]

[0222] 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J Air conditioning system 12 Heat Pump 13,131 Indirect heat exchanger 14 Solar collector 15,15B Heat storage tank 16 Air conditioned room 17 Ventilation system 30,30B First heat medium 161 Air conditioner 163 Water supply equipment 191 Well water 196 Geothermal heat exchanger 197 Second heat medium 231,232,234,235,239 Temperature Sensors 301 First liquid 302 Second liquid 303 Third liquid 304 Fourth liquid 305 Fifth liquid 306 Sixth liquid 601 CPU

Claims

1. a storage section that stores a first heat medium; a first temperature detection unit that detects a first heat medium temperature, which is a temperature of the first heat medium stored in the storage unit; An air conditioning unit that is capable of performing a heating operation by utilizing heat derived from at least the first heat medium and adjusts the temperature inside the air-conditioned room; a heating operation switching means for switching between a plurality of heating operation modes in accordance with the first heat medium temperature detected by the first temperature detection unit when the air conditioning unit performs heating operation; An air conditioning system comprising:

2. A heat pump unit is provided to perform heat exchange using a heat pump method. The heating operation switching means is a first heating operation means for supplying heat derived from a first liquid to the air conditioning unit through a path different from a path through which the heat pump unit is present, when the first heat medium temperature detected by the first temperature detection unit is higher than a first temperature, and performing a first heating operation in the air conditioning unit; a second heating operation means for, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the first temperature, heating a second liquid in the heat pump unit by utilizing heat derived from the first liquid, and performing a second heating operation in the air conditioning unit using the second liquid as a heat source; Equipped with The first liquid is the first heat medium itself or a liquid heated by the first heat medium in the storage portion, The air conditioning system according to claim 1 , wherein the second liquid is a liquid between the heat pump unit and the air conditioning unit.

3. The first heating operation means is When the first heat medium temperature detected by the first temperature detection unit is higher than the first temperature, the first liquid is sent from the storage unit to the air conditioning unit, and the first heating operation is performed in the air conditioning unit using the first liquid as a heat source; The second heating operation means is 3. The air conditioning system according to claim 2, characterized in that, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the first temperature, the first liquid is sent from the storage unit to the heat pump unit, and in the heat pump unit, heat is exchanged between the first liquid and the second liquid to heat the second liquid, and in the air conditioning unit, the second heating operation is performed using the second liquid as a heat source.

4. a first heat exchanger that extracts heat from the first liquid by heat exchange; The first heating operation means is When the first heat medium temperature detected by the first temperature detection unit is higher than the first temperature, the first heat exchange unit exchanges heat between the first liquid and a fifth liquid to heat the fifth liquid, and the first heating operation is performed in the air conditioning unit using the fifth liquid as a heat source; The second heating operation means is when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the first temperature, the first heat exchange unit exchanges heat between the first liquid and a sixth liquid to heat the sixth liquid, the heat pump unit exchanges heat between the sixth liquid and the second liquid to heat the second liquid, and the air conditioning unit performs the second heating operation using the second liquid as a heat source; The fifth liquid is a liquid between the first heat exchange unit and the air conditioning unit, The air conditioning system according to claim 2 , wherein the sixth liquid is a liquid between the first heat exchange section and the heat pump section.

5. the second heating operation means performs the second heating operation when the first heat medium temperature detected by the first temperature detection unit is higher than a second temperature lower than the first temperature and is equal to or lower than the first temperature; The heating operation switching means is a third heating operation means for, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, heating the second liquid in the heat pump unit by using heat derived from the second heat medium, and performing a third heating operation in the air conditioning unit using the second liquid as a heat source; 5. The air conditioning system according to claim 3, wherein the second heat medium is a medium that undergoes heat exchange with geothermal heat or well water.

6. A second temperature detection unit that detects a second heat medium temperature, which is the temperature of the second heat medium; an indoor temperature detection unit for detecting an indoor temperature of the air-conditioned room; Equipped with The air conditioning system according to claim 5, further comprising a cooling operation switching means for switching among a plurality of cooling operation modes in accordance with a temperature difference between the indoor temperature detected by the indoor temperature detection unit and the second heat medium temperature detected by the second temperature detection unit when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit.

7. The cooling operation switching means is a first cooling operation means for supplying cold heat derived from the second heat medium to the air conditioning unit through a path different from the path through which the heat pump unit is present, when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit and the temperature difference between the indoor temperature and the second heat medium temperature is greater than a predetermined temperature difference; and The air conditioning system according to claim 6, further comprising a second cooling operation means for cooling the second liquid in the heat pump unit by using cold heat derived from the second heat medium when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit and the temperature difference between the indoor temperature and the second heat medium temperature is equal to or less than the predetermined temperature difference, and performing a second cooling operation in the air conditioning unit using the second liquid as a heat source.

8. an indoor temperature setting unit that sets an indoor set temperature that is a target temperature of the room temperature of the air-conditioned room when the air-conditioning unit is operating; an outside air temperature detection unit for detecting the outside air temperature; Equipped with The air conditioning system according to claim 7, further comprising a ventilation means for ventilating the air-conditioned room when the outside air temperature detected by the outside air temperature detection unit is lower than the indoor set temperature set by the indoor temperature setting unit, or when the outside air temperature detected by the outside air temperature detection unit is higher than the indoor set temperature and lower than the indoor temperature when the first air conditioning operation is performed by the first air conditioning operation means or the second air conditioning operation is performed by the second air conditioning operation means.

9. a heating section that heats the first heat medium stored in the storage section; a heating control means for heating the first heat medium by the heating section; Equipped with The heating operation switching means is The air conditioning system according to claim 8, further comprising a first switching means for switching to the first heating operation by the first heating operation means when the first heat medium is heated by the heating control means and the first heat medium temperature detected by the first temperature detection unit becomes equal to or higher than a third temperature which is higher than the first temperature while the second heating operation is being performed by the second heating operation means.

10. The heating operation switching means is The air conditioning system according to claim 9, further comprising a second switching means for switching to the second heating operation by the second heating operation means when, while the third heating operation is being performed by the third heating operation means, the first heat medium is heated by the heating control means and the first heat medium temperature detected by the first temperature detection unit becomes equal to or higher than a fourth temperature that is higher than the second temperature.

11. a second heat exchange unit that extracts heat from the second heat medium by heat exchange; the third heating operation means, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, performs heat exchange between the second heat medium and a third liquid in the second heat exchange unit to heat the third liquid, performs heat exchange between the third liquid and the second liquid in the heat pump unit to heat the second liquid, and performs the third heating operation using the second liquid as a heat source in the air conditioning unit; The air conditioning system according to claim 10, wherein the third liquid is a liquid between the second heat exchange section and the heat pump section.

12. The first cooling operation means is when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit and the temperature difference between the indoor temperature and the second heat medium temperature is larger than the predetermined temperature difference, the second heat exchange unit exchanges heat between the second heat medium and a fourth liquid to cool the fourth liquid, and the air conditioning unit performs the first cooling operation using the fourth liquid as a heat source; The second cooling operation means is when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit and the temperature difference between the indoor temperature and the second heat medium temperature is equal to or less than the predetermined temperature difference, the second heat exchange unit exchanges heat between the second heat medium and the third liquid to cool the third liquid, the heat pump unit exchanges heat between the third liquid and the second liquid to cool the second liquid, and the air conditioning unit performs the second cooling operation using the second liquid as a heat source, The air conditioning system according to claim 11, wherein the fourth liquid is a liquid between the second heat exchange section and the air conditioning section.

13. A water supply unit provided in the air-conditioning room and supplying water to the air-conditioning room; a water supply control means for supplying the second heat medium to the water supply section; Equipped with The air conditioning system according to claim 12, wherein the second heat medium is the well water.

14. A geothermal heat exchange unit that exchanges heat between the geothermal heat and the medium is provided. The second heat medium is the medium that is heat exchanged with the geothermal heat, The air conditioning system according to claim 10, characterized in that, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, the third heating operation means heats the second heat medium by exchanging heat between the geothermal heat and the second heat medium in the geothermal heat exchange unit, heats the second liquid by exchanging heat between the second heat medium and the second liquid in the heat pump unit, and performs the third heating operation using the second liquid as a heat source in the air conditioning unit.

15. The first cooling operation means is When the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and the temperature difference between the indoor temperature and the second heat medium temperature is larger than the predetermined temperature difference, the geothermal heat exchange unit exchanges heat between the geothermal heat and the second heat medium to cool the second heat medium, and the air conditioning unit performs the first cooling operation using the second heat medium as a heat source, The second cooling operation means is The air conditioning system of claim 14, characterized in that when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and the temperature difference between the indoor temperature and the second heat medium temperature is equal to or less than the predetermined temperature difference, the geothermal heat exchange unit exchanges heat between the geothermal heat and the second heat medium to cool the second heat medium, the heat pump unit exchanges heat between the second heat medium and the second liquid to cool the second liquid, and the air conditioning unit performs the second cooling operation using the second liquid as a heat source.

16. The second heat medium is well water, 11. The air conditioning system according to claim 10, wherein, when the first heat medium temperature detected by the first temperature detection unit is equal to or lower than the second temperature, the third heating operation means heats the second liquid by heat exchange between the second heat medium and the second liquid in the heat pump unit, and performs the third heating operation using the second liquid as a heat source in the air conditioning unit.

17. The first cooling operation means is When the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and the temperature difference between the indoor temperature and the second heat medium temperature is larger than the predetermined temperature difference, the first cooling operation is performed in the air conditioning unit using the second heat medium as a heat source; The second cooling operation means is The air conditioning system according to claim 16, characterized in that, when the indoor temperature detected by the indoor temperature detection unit is higher than the second heat medium temperature detected by the second temperature detection unit, and the temperature difference between the indoor temperature and the second heat medium temperature is equal to or less than the predetermined temperature difference, the heat pump unit exchanges heat between the second heat medium and the second liquid to cool the second liquid, and the air conditioning unit performs the second cooling operation using the second liquid as a heat source.

18. A water supply unit provided in the air-conditioning room and supplying water to the air-conditioning room; a water supply control means for supplying the second heat medium to the water supply section; 18. The air conditioning system according to claim 17, further comprising:

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