Heat pump system

Abstract

To provide a heat pump system reducing installation costs.SOLUTION: A heat pump system 1A includes: a solar heat collector 211; and a unit 11A. The unit 11A includes inside an air heat exchanger 111, a first heat exchanger 112, a heat pump part 35, and a control board 70. A CPU of the control board 70 switches ON and OFF of the solar heat collector 211, the air heat exchanger 111, the first heat exchanger 112, and the heat pump part 35, and heats or cools a second heat medium 392. The CPU of the control board 70 turns the solar heat collector 211 and the air heat exchanger 111 ON, turns the first heat exchanger 112 and the heat pump part 35 OFF, supplies the air heat exchanger 111 with a first heat medium 391 heated in the solar heat collector 211, and radiates heat of the first heat medium 391 in the air heat exchanger 111.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a heat pump system that performs heat exchange. [Background technology]

[0002] Conventionally, heat pump systems that perform heat exchange are known. For example, the heat pump system described in Patent Document 1 includes a unit that houses an air heat exchanger, a first heat exchanger, a heat pump unit, a control panel, etc., inside a storage unit. The heat pump system also includes a solar thermal collector. The heat pump system uses the solar thermal collector and the air heat exchanger to heat or cool a first heat medium. The heat pump system uses the heat of the first heat medium in the first heat exchanger and the heat pump unit to cool or heat a second heat medium. The heat pump system uses the heat of the second heat medium to perform air conditioning, hot water supply, etc. in load-side equipment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-034164 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in the summer, when solar radiation is high, if the first heat medium is heated by the solar thermal collector and the temperature of the first heat medium becomes too high, it may be better to dissipate heat from the first heat medium. However, the conventional heat pump system described above was unable to dissipate heat from the first heat medium when the first heat exchanger and the heat pump unit were not in use. Therefore, in order to dissipate heat from the first heat medium, it was necessary to add components other than the solar thermal collector, the air heat exchanger, the first heat exchanger, and the heat pump unit, which could increase the cost of the heat pump system.

[0005] An object of the present invention is to provide a heat pump system that reduces installation costs. [Means for solving the problem]

[0006] The heat pump system according to the present invention uses a first heat medium as a heat source to heat or cool a second heat medium, and includes a solar thermal collector that heats the first heat medium with heat from solar radiation, an air heat exchanger that exchanges heat between air and the first heat medium to heat or cool the first heat medium, a first heat exchanger that exchanges heat between the first heat medium and the second heat medium to heat or cool the second heat medium, a heat pump unit that exchanges heat between the first heat medium and the second heat medium by a heat pump method to heat or cool the second heat medium, and the solar heat The system includes a control panel having a control unit that switches the solar thermal collector, the air heat exchanger, the first heat exchanger, and the heat pump unit ON and OFF to heat or cool the second heat medium, and a unit that has the air heat exchanger, the first heat exchanger, the heat pump unit, and the control panel inside, wherein the control unit turns the solar thermal collector and the air heat exchanger ON and turns the first heat exchanger and the heat pump unit OFF, supplies the first heat medium heated in the solar thermal collector to the air heat exchanger, and dissipates heat from the first heat medium in the air heat exchanger.

[0007] In this case, the first heat medium heated in the solar thermal collector is sent to the air heat exchanger, and the heat of the first heat medium is dissipated. Therefore, when dissipating the heat of the first heat medium, there is no need to add any components other than the solar thermal collector, the air heat exchanger, the first heat exchanger, and the heat pump unit, and the installation cost of the heat pump system can be reduced.

[0008] The heat pump system may include a loop flow path provided outside the unit and through which the second heat medium circulates; a first branch flow path branching from the loop flow path; a geothermal heat exchanger connected to the first branch flow path and exchanging heat between geothermal heat and the second heat medium to heat or cool the second heat medium; a first confluence flow path connected to the geothermal heat exchanger and converging with the loop flow path; and a geothermal pump provided in the first branch flow path or the first confluence flow path and flowing the second heat medium from the loop flow path to the geothermal heat exchanger. In this case, a portion of the second heat medium flowing through the loop flow path flows to the geothermal heat exchanger via the first branch flow path. The second heat medium heated or cooled in the geothermal heat exchanger then confluences with the second heat medium flowing through the loop flow path via the first confluence flow path. This heats or cools the second heat medium flowing through the loop flow path. Because the second heat medium flowing through the loop flow path is heated or cooled, the power consumption of the heat pump unit is reduced compared to a case in which a geothermal heat exchanger is not provided. This reduces the power consumption of the heat pump system.

[0009] The heat pump system may include a first air-conditioning heat pump provided outside the unit and performing air conditioning using a heat pump system using the temperature of the second heat medium; a second air-conditioning heat pump provided outside the unit and performing air conditioning using a heat pump system using the temperature of the second heat medium; a hot water supply heat pump provided outside the unit and providing hot water using a heat pump system using the temperature of the second heat medium; a second branch flow path branching from the loop flow path and connecting the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot water supply heat pump in parallel; and a second confluence flow path connected to the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot water supply heat pump and merging into the loop flow path.

[0010] In this case, a portion of the second heat medium flowing through the loop flow path is supplied to the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot-water supply heat pump to perform air conditioning and hot-water supply. Furthermore, the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot-water supply heat pump, which are multiple devices that use the temperature of the second heat medium, can be connected to the loop flow path. Furthermore, the second heat medium that flows through the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot-water supply heat pump merges into the loop flow path. For example, when the first air-conditioning heat pump and the second air-conditioning heat pump are used for cooling, the temperature of the second heat medium increases. Meanwhile, the temperature of the second heat medium decreases in the hot-water supply heat pump. Therefore, the second heat medium whose temperature has increased in the first air-conditioning heat pump and the second air-conditioning heat pump and the second heat medium whose temperature has decreased in the hot-water supply heat pump merge in the loop flow path. As a result, the temperature of the second heat medium, which has increased in temperature in the first air-conditioning heat pump and the second air-conditioning heat pump, decreases, and the temperature of the second heat medium, which has decreased in temperature in the hot water supply heat pump, increases. In other words, heat recovery is performed. Therefore, compared to when no loop flow path is provided, the load on the heat pump unit is reduced, and power consumption can be reduced.

[0011] The heat pump system includes a first flow rate detection means that detects a first flow rate of the second heat medium flowing from the first heat exchanger or the heat pump unit toward the loop flow path, a second flow rate detection means that detects a second flow rate of the second heat medium flowing through the first air-conditioning heat pump, a third flow rate detection means that detects a third flow rate of the second heat medium flowing through the second air-conditioning heat pump, a fourth flow rate detection means that detects a fourth flow rate of the second heat medium flowing through the hot water supply heat pump, and a pump control means that controls the flow rate of the second heat medium flowed by the geothermal pump based on the first flow rate, the second flow rate, the third flow rate, and the fourth flow rate, and the first flow rate detected by the first flow rate detection means is designated VM1, the second flow rate detected by the second flow rate detection means is designated VM2, and the third flow rate detected by the third flow rate detection means is designated VM3. When the fourth flow rate detected by the fourth flow rate detection means is VM4, the pump control means controls the flow rate of the second heat medium flowing into the underground heat exchanger so as to obtain |±VM1±VM2±VM3-VM4|, and the sign in |±VM1±VM2±VM3-VM4| is "+VM1" when at least one of the first heat exchanger and the heat pump unit is heating, "-VM1" when at least one of the first heat exchanger and the heat pump unit is cooling, "+VM2" when the first air conditioning heat pump is cooling, "-VM2" when the first air conditioning heat pump is heating, "+VM3" when the second air conditioning heat pump is cooling, "-VM3" when the second air conditioning heat pump is heating, and may always be "-VM4" when the hot water supply heat pump is operating.

[0012] In this case, the flow rate of the second heat medium flowing through the underground heat exchanger is controlled so that |±VM1±VM2±VM3-VM4| is satisfied. Therefore, compared to when the flow rate of the second heat medium flowing through the underground heat exchanger is not controlled so that the flow rate is |±VM1±VM2±VM3-VM4|, the flow rate of the second heat medium supplied to the underground heat exchanger is closer to the total flow rate flowing through the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot water supply heat pump. Therefore, power consumption can be reduced compared to when the flow rate of the second heat medium flowing through the underground heat exchanger is not controlled so that |±VM1±VM2±VM3-VM4| is satisfied.

[0013] The heat pump system may include a first flow path connecting the air heat exchanger and the solar thermal collector, a second flow path connecting the solar thermal collector and the heat pump unit, a branch section where a third flow path and a fourth flow path branch, a fifth flow path connecting the heat pump unit and the branch section, and a first pump that flows the first heat medium through a part of the first flow path, the second flow path, the third flow path, the fourth flow path, and the fifth flow path, the third flow path being connected to the first flow path and the fourth flow path being connected to the second flow path, the third flow path being provided with a metering valve that regulates the flow rate of the first heat medium when the first heat medium flows, and the fourth flow path being provided with a proportional valve that can change the flow rate of the first heat medium when the first heat medium flows, and a flow control unit that controls the proportional valve and controls the flow rate of the first heat medium flowing through the fourth flow path. In this case, the flow rate of the first heat medium flowing through the fourth flow path can be adjusted by adjusting the flow rate of the first heat medium flowing through the solar thermal collector using the flow control unit. Therefore, the flow rate of the first heat medium flowing through the solar thermal collector is smaller than the flow rate of the first heat medium flowing through the heat pump unit. Therefore, for example, when the flow rate of the first heat medium required to flow through the solar thermal collector is smaller than the flow rate of the first heat medium required to flow through the heat pump unit, the flow rate of the first heat medium flowing through the solar thermal collector can be reduced, thereby reducing the power consumption of the heat pump system. Furthermore, for example, when the flow rate of the first heat medium required to flow through the solar thermal collector is smaller than the flow rate of the first heat medium required to flow through the heat pump unit, if the first pump flows the first heat medium at a flow rate equal to the flow rate required to flow through the solar thermal collector, the flow rate of the first pump may be too small, which could cause an abnormality in the heat pump unit. In this embodiment, by flowing the first heat medium through the fourth flow path, the flow rate of the first heat medium flowing through the solar thermal collector can be reduced and the flow rate of the first pump can be increased. Therefore, the possibility of the flow rate of the first pump being too small, which could cause an abnormality in the heat pump unit, can be reduced. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram showing the physical configuration of a heat pump system 1A. [Figure 2] FIG. 2 is a schematic diagram showing the physical configuration of the load-side equipment 212. [Figure 3] 1 is a schematic diagram showing the electrical configuration of a heat pump system 1A. [Figure 4] FIG. 2 is a schematic diagram showing the electrical configuration of a load-side facility 212 in a heat pump system 1A. [Figure 5] 10 is a diagram showing a table 95 showing modes 1 to 8 and the summer heat release mode. FIG. [Figure 6] 10 is a schematic diagram showing the flow of a first heat medium 391 and a second heat medium 392 in mode 1 or mode 4. FIG. [Figure 7] 10 is a schematic diagram showing the flow of a first heat medium 391 and a second heat medium 392 in mode 2 or mode 7. FIG. [Figure 8] 10 is a schematic diagram showing the flows of a first heat medium 391 and a second heat medium 392 in Mode 3. FIG. [Figure 9] 10 is a schematic diagram showing the flows of a first heat medium 391 and a second heat medium 392 in mode 5. FIG. [Figure 10] 10 is a schematic diagram showing the flows of a first heat medium 391 and a second heat medium 392 in Mode 6. FIG. [Figure 11] 10 is a schematic diagram showing the flows of a first heat medium 391 and a second heat medium 392 in mode 8. FIG. [Figure 12] FIG. 10 is a schematic diagram showing the flows of a first heat medium 391 and a second heat medium 392 in the summer heat radiation mode. [Figure 13] FIG. 10 is a diagram showing a data table 96. [Figure 14] FIG. 9 is a diagram showing a data table 97. [Figure 15] FIG. 10 is a diagram showing a first valid / invalid determination graph 98. [Figure 16] FIG. 10 is a diagram showing a second valid / invalid determination graph 99. [Figure 17] FIG. 1 is a diagram showing a geothermal pump control graph 100. [Figure 18] 10 is a flowchart of a heating operation process. [Figure 19] This is a continuation of the flowchart in FIG. 18. [Figure 20] This is a continuation of the flowchart in FIG. 19. [Figure 21] 19 is another flowchart continuing from FIG. 18. [Figure 22] This is a continuation of the flowchart in FIG. 21. [Figure 23] 10 is a flowchart of a cooling operation process. [Figure 24] 10 is a flowchart of a heat radiation process in summer. [Figure 25] 10 is a flowchart of a geothermal pump process. [Figure 26] This is a continuation of the flowchart in Figure 25. [Figure 27] 10 is a schematic diagram showing the flows of a first heat medium 391 and a second heat medium 392 in Mode 3 in a heat pump system 1B according to a modified example. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] A heat pump system 1A embodying the present invention will be described below with reference to the drawings. As shown in Fig. 1, the heat pump system 1A includes a unit 11A, a solar heat collector 211, and a load-side facility 212.

[0016] The unit 11A has an exterior housing portion 110. The unit 11A houses an air heat exchanger 111, a first heat exchanger 112, a heat pump portion 35, a control panel 70, and the like inside the housing portion 110.

[0017] The configuration of unit 11A will be described. Connection ports 801, 802, 803, and 804 are provided in storage section 110 of unit 11A. One end of flow path 811 is connected to connection port 801, and the other end is connected to branch section 901. One end of flow path 812 is connected to branch section 901, and the other end is connected to air heat exchanger 111. Flow path 812 is connected to one end of flow path 813 via air heat exchanger 111. The other end of flow path 813 is connected to branch section 902.

[0018] One end of flow path 814 is connected to branch portion 902, and the other end is connected to zero-side heat exchanger 351 of heat pump portion 35. Flow path 814 is connected to one end of flow path 815 via zero-side heat exchanger 351. The other end of flow path 815 is connected to branch portion 903. One end of flow path 816 is connected to branch portion 903, and the other end is connected to branch portion 904.

[0019] One end of flow channel 817 is connected to branching portion 904, and the other end is connected to branching portion 905. One end of flow channel 818 is connected to branching portion 905, and the other end is connected to branching portion 906. One end of flow channel 819 is connected to branching portion 906, and the other end is connected to connection port 802.

[0020] One end of the flow path 820 is connected to the branching portion 904, and the other end is connected to the first heat exchanger 112. The flow path 820 is connected to one end of a flow path 821 via the first heat exchanger 112. The other end of the flow path 821 is connected to the branching portion 905.

[0021] One end of flow path 822 is connected to branch portion 901, and the other end is connected to branch portion 907. One end of flow path 823 is connected to branch portion 907, and the other end is connected to branch portion 906. One end of flow path 824 is connected to branch portion 907, and the other end is connected to branch portion 908.

[0022] One end of the flow path 825 is connected to the branching portion 908, and the other end is connected to the branching portion 903. One end of the flow path 826 is connected to the branching portion 908, and the other end is connected to the branching portion 902.

[0023] One end of flow path 841 is connected to connection port 803, and the other end is connected to branch portion 911. One end of flow path 842 is connected to branch portion 911, and the other end is connected to primary side heat exchanger 352 of heat pump section 35. Flow path 842 is connected to one end of flow path 843 via primary side heat exchanger 352. The other end of flow path 843 is connected to branch portion 912. One end of flow path 844 is connected to branch portion 912, and the other end is connected to connection port 804.

[0024] One end of flow path 845 is connected to branch portion 911, and the other end is connected to first heat exchanger 112. Flow path 845 is connected to one end of flow path 846 via first heat exchanger 112. The other end of flow path 846 is connected to branch portion 912.

[0025] Flow path 811 is provided with an on-off valve 921. Flow path 813 is provided with an on-off valve 922. Flow path 815 is provided with an on-off valve 923. Flow path 817 is provided with an on-off valve 924. Flow path 821 is provided with an on-off valve 925. Flow path 822 is provided with an on-off valve 926. Flow path 823 is provided with an on-off valve 927. Flow path 824 is provided with an on-off valve 928. Flow path 825 is provided with an on-off valve 929. Flow path 826 is provided with an on-off valve 930. Flow path 845 is provided with an on-off valve 931. Flow path 843 is provided with an on-off valve 932.

[0026] A temperature sensor 941 is provided in flow path 811 between the on-off valve 921 and the branching portion 901. A temperature sensor 942 is provided in flow path 812. A temperature sensor 943 is provided in flow path 813 between the on-off valve 922 and the air heat exchanger 111. A temperature sensor 944 is provided in flow path 814. A temperature sensor 945 is provided in flow path 820. A temperature sensor 946 is provided in flow path 818. A temperature sensor 947 is provided in flow path 819.

[0027] A temperature sensor 951 is provided in the flow path 841. A temperature sensor 952 is provided in the flow path 842. A temperature sensor 953 is provided in the flow path 844. A temperature sensor 954 is provided in the flow path 845 between the on-off valve 931 and the first heat exchanger 112.

[0028] In the flow path 818, a pump 961 is provided between the temperature sensor 946 and the branching portion 906. In the flow path 844, a pump 962 is provided between the temperature sensor 953 and the branching portion 912.

[0029] A flow rate sensor 971 is provided in the flow path 818 between the pump 961 and the temperature sensor 946. A flow rate sensor 972 is provided in the flow path 841 between the temperature sensor 951 and the branching portion 911. A solar radiation detector 891, an operation portion 892, and a temperature sensor 948 are provided on the outer surface of the unit 11A.

[0030] The solar heat collector 211 is provided outside the unit 11A. One end of a flow path 981 is connected to the solar heat collector 211, and the other end is connected to the connection port 801. The flow path 981 is connected to one end of a flow path 982 via the solar heat collector 211. The other end of the flow path 982 is connected to the connection port 802. A pressure sensor 213 is provided in the flow path 981.

[0031] The load side equipment 212 is provided outside the unit 11A. The load side equipment 212 will be described later. The flow path 991 is connected to the load side equipment 212 side (see FIGS. 1 and 2). The flow path 992 (see FIGS. 1 and 2) connected to the load side equipment 212 side is connected to the connection port 804.

[0032] The heat pump system 1A uses a first heat medium 391 on the zeroth side as a heat source, heats or cools a second heat medium 392 on the primary side in the first heat exchanger 112 or the heat pump section 35, and uses the heat of the second heat medium 392 in the load side equipment 212. In this embodiment, as an example, the first heat medium 391 is an antifreeze liquid (e.g., ethylene glycol), and the second heat medium 392 is fresh water. The first heat medium 391 on the zeroth side flows through flow paths 811 to 826 and flow paths 981 and 982. The second heat medium 392 on the primary side flows through flow paths 841 to 846 and flow paths 991 and 992.

[0033] The heat pump unit 35 uses a heat pump system to exchange heat between a first heat medium 391 and a second heat medium 392, thereby heating or cooling the second heat medium 392. The heat pump unit 35 includes a zero-side heat exchanger 351, a primary-side heat exchanger 352, a compressor 353, an expansion valve 354, and an intermediate refrigerant pipe 355. The intermediate refrigerant pipe 355 is a circulation pipe through which a refrigerant 356 flows.

[0034] The zero-side heat exchanger 351, the primary-side heat exchanger 352, the compressor 353, and the expansion valve 354 are interposed in an intermediate refrigerant pipe 355. The compressor 353 compresses a refrigerant 356. The expansion valve 354 expands the refrigerant 356. The refrigerant 356 is a gaseous refrigerant at room temperature and pressure, such as R410A. The heat pump unit 35 extracts heat from a first heat medium 391 in the zero-side heat exchanger 351, and heats or cools a second heat medium 392 in the primary-side heat exchanger 352.

[0035] The load-side equipment 212 will be described with reference to Fig. 2. The load-side equipment 212 includes a load 22, a loop flow path 71, a geothermal heat exchanger 604, and the like. The load 22 includes a hot water supply equipment 221, an air conditioning equipment 222, and an air conditioning equipment 223. The hot water supply equipment 221 includes a hot water supply heat pump 603, a hot water supply tank 605, a pump 777, flow sensors 778 and 779, and a temperature sensor 789. The air conditioning equipment 222 includes an air conditioning heat pump 602, a temperature sensor 782, a pump 772, a flow sensor 775, and a temperature sensor 785. The air conditioning equipment 223 includes an air conditioning heat pump 601, a temperature sensor 781, a pump 771, a flow sensor 774, and a temperature sensor 784.

[0036] The loop flow path 71 is provided outside the unit 11A and is a flow path through which the second heat medium 392 circulates. The loop flow path 71 includes flow paths 711, 712, 715, 716, 717, and 718. The flow path 711 is a flow path between the branching portion 721 and the branching portion 722. The flow path 712 is a flow path between the branching portion 722 and the branching portion 723. The flow path 715 is a flow path between the branching portion 723 and the branching portion 726. The flow path 716 is a flow path between the branching portion 726 and the branching portion 727. The flow path 717 is a flow path between the branching portion 727 and the branching portion 728. The flow path 718 is a flow path between the branching portion 728 and the branching portion 721.

[0037] A check valve 731 is provided in the flow path 712. A check valve 732 is provided in the flow path 716. A check valve 733 is provided in the flow path 718.

[0038] A temperature sensor 734 is provided in the flow path 711. A flow rate sensor 735 is provided in the flow path 715. A temperature sensor 737 is provided in the flow path 717. A temperature sensor 738 is provided in the flow path 715.

[0039] One end of flow path 991 is connected to connection port 803, and the other end is connected to branch portion 721. An on-off valve 613 is provided in flow path 991. One end of flow path 992 is connected to connection port 804, and the other end is connected to branch portion 728. An on-off valve 614 is provided in flow path 992.

[0040] The first branch flow path 741 is a flow path branching off from the loop flow path 71. One end of the first branch flow path 741 is connected to the branching section 726, and the other end is connected to the underground heat exchanger 604. The underground heat exchanger 604 exchanges heat between underground heat and the second heat medium 392, thereby heating or cooling the second heat medium 392. The first branch flow path 741 is connected to one end of a first merging flow path 742 via the underground heat exchanger 604. The other end of the first merging flow path 742 is connected to the branching section 727. The first merging flow path 742 is a flow path connected to the underground heat exchanger 604 and merging into the loop flow path 71.

[0041] The first branch flow path 741 is provided with an on-off valve 743, a geothermal pump 744, and a flow rate sensor 745, in this order from the branching portion 726 toward the geothermal heat exchanger 604. The geothermal pump 744 is a pump that causes the second heat medium 392 to flow from the loop flow path 71 to the geothermal heat exchanger 604. The first merging flow path 742 is provided with a temperature sensor 746.

[0042] The second branch flow path 750 is a flow path that branches off from the loop flow path 71 and connects in parallel the air conditioning heat pump 601, the air conditioning heat pump 602, and the hot water supply heat pump 603. The second merging flow path 759 is a flow path that is connected to the air conditioning heat pump 601, the air conditioning heat pump 602, and the hot water supply heat pump 603 and merges with the loop flow path 71.

[0043] The second branch flow path 750 includes flow paths 751, 752, 754, and 756. The second merging flow path 759 includes flow paths 753, 755, 757, and 758. One end of the flow path 751 is connected to the branching section 722, and the other end is connected to the branching section 761. One end of the flow path 752 is connected to the branching section 761, and the other end is connected to the air-conditioning heat pump 601. The flow path 752 is connected to one end of a flow path 753 via the air-conditioning heat pump 601. The other end of the flow path 753 is connected to the branching section 762. The air-conditioning heat pump 601 performs air conditioning by a heat pump method, using the temperature of the second heat medium 392.

[0044] One end of the flow path 754 is connected to a branching section 761, and the other end is connected to the air conditioning heat pump 602. The flow path 754 is connected to one end of a flow path 755 via the air conditioning heat pump 602. The other end of the flow path 755 is connected to a branching section 762. The air conditioning heat pump 602 performs air conditioning by a heat pump method, using the temperature of the second heat medium 392.

[0045] One end of flow path 756 is connected to branch portion 761, and the other end is connected to hot water supply heat pump 603. Flow path 756 is connected to one end of flow path 757 via hot water supply heat pump 603. The other end of flow path 757 is connected to branch portion 762. One end of flow path 758 is connected to branch portion 762, and the other end is connected to branch portion 723. Hot water supply heat pump 603 supplies hot water by a heat pump system, using the temperature of second heat medium 392.

[0046] A pump 771 is provided in flow path 752, and a pump 772 is provided in flow path 754. A pump 773 is provided in flow path 756. A temperature sensor 781 is provided in flow path 752 between branching point 761 and pump 771. A temperature sensor 782 is provided in flow path 754 between branching point 761 and pump 772. A temperature sensor 783 is provided in flow path 756 between branching point 761 and pump 773.

[0047] Flow path 753 is provided with flow sensor 774, and flow path 755 is provided with flow sensor 775. Flow path 757 is provided with flow sensor 776. Flow path 753 is provided with temperature sensor 784 between branching portion 762 and flow sensor 774. Flow path 755 is provided with temperature sensor 785 between branching portion 762 and flow sensor 775. Flow path 757 is provided with temperature sensor 786 between branching portion 762 and flow sensor 776. Flow path 758 is provided with temperature sensor 787.

[0048] One end of flow path 791 is connected to branch portion 763, and the other end is connected to hot water supply heat pump 603. Flow path 791 is connected to one end of flow path 792 via hot water supply heat pump 603. The other end of flow path 792 is connected to branch portion 764.

[0049] One end of flow path 793 is connected to branch portion 763, and the other end is connected to hot water supply tank 605. One end of flow path 794 is connected to hot water supply tank 605, and the other end is connected to branch portion 764.

[0050] One end of flow path 795 is connected to branch 763, and the other end is connected to raw water equipment 281. Raw water equipment 281 is equipment that supplies water 393 heated by hot water heat pump 603. Raw water equipment 281 is, for example, a water supply. One end of flow path 765 is connected to branch 764, and the other end is connected to hot water usage equipment 282. Hot water usage equipment 282 is equipment that uses water 393 heated by hot water heat pump 603. Hot water usage equipment 282 is, for example, a gas water heater. If hot water usage equipment 282 is a gas water heater, hot water heat pump 603 is a device that preheats water 393 that is makeup water for the gas water heater, and raw water equipment 281 is makeup water equipment (for example, a water supply) that supplies makeup water 393.

[0051] A pump 777, a flow rate sensor 778, and a temperature sensor 788 are provided in the flow path 791 in this order from the branch point 763 toward the hot water supply heat pump. A temperature sensor 789 is provided in the flow path 792.

[0052] The hot water supply heat pump 603 uses the second heat medium 392 flowing from the flow path 756 to the flow path 757 as a heat source to heat water 393 (for example, tap water or fresh water) flowing from the flow path 791 to the flow path 792, to produce hot water. The heated water 393 is stored in the hot water supply tank 605 or used in the hot water usage facility 282.

[0053] When the second heat medium 392 heated or cooled in the first heat exchanger 112 or the heat pump section 35 is to flow from the unit 11A to the load-side equipment 212, the CPU 701 opens the on-off valves 613 and 614. The CPU 701 drives the pump 962. The second heat medium 392 that has flowed through the flow path 841 flows into the loop flow path 71 via the flow path 991 and merges with the second heat medium 392 flowing through the loop flow path 71 (see arrow 271). In the loop flow path 71, the second heat medium 392 flows in the order of the flow path 711, the flow path 712, the flow path 715, the flow path 716, the flow path 717, the flow path 718, and the flow path 711 (see arrow 272). Since the loop flow path 71 is provided with check valves 731, 732, and 733, the second heat medium 392 does not flow in the reverse direction. A portion of the second heat medium 392 flowing in the loop flow path 71 flows through a flow path 992 into the flow path 844 of the unit 11A (see arrow 273).

[0054] When the second heat medium 392 is caused to flow from the loop flow path 71 to the geothermal heat exchanger 604, the CPU 701 drives the geothermal pump 744. A portion of the second heat medium 392 flowing through the loop flow path 71 passes from the loop flow path 71 through the first branch flow path 741, the geothermal heat exchanger 604, and the first merging flow path 742, and then merges with the loop flow path 71 (see arrow 274). When the CPU 701 stops the geothermal pump 744 or closes the on-off valve 743, the second heat medium 392 does not flow to the geothermal heat exchanger 604.

[0055] When the second heat medium 392 is caused to flow from the loop flow path 71 to the air conditioning heat pump 601, the CPU 701 drives the pump 771. A portion of the second heat medium 392 flowing through the loop flow path 71 passes through the loop flow path 71, flow path 751, flow path 752, the air conditioning heat pump 601, flow path 753, and flow path 758, and then joins the loop flow path 71 (see arrows 275, 276, and 279). When the CPU 701 stops the pump 771, the second heat medium 392 does not flow to the air conditioning heat pump 601.

[0056] When the second heat medium 392 is caused to flow from the loop flow path 71 to the air conditioning heat pump 602, the CPU 701 drives the pump 772. A portion of the second heat medium 392 flowing through the loop flow path 71 passes through the loop flow path 71, flow path 751, flow path 754, the air conditioning heat pump 602, flow path 755, and flow path 758, and then merges with the loop flow path 71 (see arrows 275, 277, and 279). When the CPU 701 stops the pump 772, the second heat medium 392 does not flow to the air conditioning heat pump 602.

[0057] When the second heat medium 392 is caused to flow from the loop flow path 71 to the hot water supply heat pump 603, the CPU 701 drives the pump 773. A portion of the second heat medium 392 flowing through the loop flow path 71 passes through the loop flow path 71, flow path 751, flow path 756, the hot water supply heat pump 603, flow path 757, and flow path 758, and then joins the loop flow path 71 (see arrows 275, 278, and 279). When the CPU 701 stops the pump 773, the second heat medium 392 does not flow to the hot water supply heat pump 603.

[0058] When water 393 is flowed through the hot water supply heat pump 603, the CPU 701 drives the pump 777. The water 393 flows through the raw water facility 281, flow path 795, flow path 791, the hot water supply heat pump 603, flow path 792, and flow path 765 to the hot water usage facility 282 (see arrow 261). In the hot water supply heat pump 603, the second heat medium 392 and the water 393 exchange heat, and the water 393 is heated to become hot water, which flows to the hot water usage facility 282. Although not shown, the water 393 heated in the hot water supply heat pump 603 may be supplied to the hot water supply tank 605 through flow path 794 and stored in the hot water supply tank 605 in some cases. The hot water water 393 stored in the hot water supply tank 605 may be supplied to the hot water usage facility 282 in some cases.

[0059] The electrical configuration of unit 11A of heat pump system 1A will be described with reference to Fig. 3. Control panel 70 includes CPU 701, ROM 702, and RAM 703. Unit 11A includes control panel 70, first heat exchanger 112, heat pump section 35, air heat exchanger 111, pumps 961 and 962, on-off valves 921 to 932, flow sensors 971 and 972, temperature sensors 941 to 948, temperature sensors 951 to 954, a solar radiation detector 891, and an operation section 892. A solar heat collector 211 and load-side equipment 212 are provided outside unit 11A.

[0060] The CPU 701 controls the unit 11A. The CPU 701 is electrically connected to the ROM 702 and the RAM 703. The ROM 702 stores various program data such as programs for the heating operation process (see FIG. 18), the cooling operation process (see FIG. 23), the summer heat dissipation process (see FIG. 24), and the geothermal pump process (see FIG. 25), which will be described later. The RAM 703 stores various temporary data. A flash memory may be provided and various data may be stored in the flash memory.

[0061] The CPU 701 is electrically connected to the heat pump unit 35. The CPU 701 controls the heat pump unit 35, and performs heat exchange between the first heat medium 391 and the second heat medium 392 by the heat pump method.

[0062] The CPU 701 is electrically connected to the air heat exchanger 111. The storage section 110 is provided with a vent hole (not shown) for taking in outside air from outside the unit 11A into the air heat exchanger 111. The CPU 701 controls the air heat exchanger 111 to exchange heat between the outside air from outside the unit 11A and the first heat medium 391. The CPU 701 is electrically connected to the solar heat collector 211. The CPU 701 controls the solar heat collector 211 to heat the first heat medium 391 with heat from solar radiation.

[0063] The CPU 701 is electrically connected to the pumps 961, 962, the temperature sensors 941-948, 951-954, the on-off valves 921-932, and the flow rate sensors 971, 972. As an example, the pumps 961, 962 are pumps (for example, inverter pumps) that can adjust the flow rates of the first heat medium 391 and the second heat medium 392.

[0064] The flow rate sensor 971 outputs a signal corresponding to the flow rate of the first heat medium 391 flowing through the flow path 818 to the CPU 701. The CPU 701 detects the flow rate of the first heat medium 391 flowing through the flow path 818 based on the output of the flow rate sensor 971. The flow rate sensor 972 outputs a signal corresponding to the flow rate of the second heat medium 392 flowing through the flow path 841 to the CPU 701. The CPU 701 detects the flow rate of the second heat medium 392 flowing through the flow path 841 based on the output of the flow rate sensor 972.

[0065] The temperature sensors 941-948 output signals corresponding to the temperatures of the first heat medium 391 flowing through the flow paths in which the temperature sensors 941-948 are installed to the CPU 701. The CPU 701 detects the temperatures of the first heat medium 391 flowing through the flow paths based on the outputs of the temperature sensors 941-948. The temperature sensors 951-954 output signals corresponding to the temperatures of the second heat medium 392 flowing through the flow paths in which the temperature sensors 951-954 are installed to the CPU 701. The CPU 701 detects the temperature of the second heat medium 392 flowing through the flow paths based on the outputs of the temperature sensors 941-954.

[0066] The CPU 701 controls the pumps 961 and 962 while referring to the flow rates and temperatures of the first heat medium 391 and the second heat medium 392 to adjust the flow rates of the first heat medium 391 and the second heat medium 392 .

[0067] The CPU 701 is electrically connected to a solar radiation detector 891 and an operation unit 892. The solar radiation detector 891 outputs a signal corresponding to the amount of solar radiation from the sun to the CPU 701. The CPU 701 detects the amount of solar radiation based on the output of the solar radiation detector 891. The CPU 701 acquires instructions from the user input via the operation unit 892. The CPU 701 is also capable of measuring time and hour. The CPU 701 is electrically connected to a pressure sensor 213. The pressure sensor 213 outputs a signal corresponding to the pressure of the first heat medium 391 in the flow path 981 to the CPU 701. The CPU 701 detects the pressure of the first heat medium 391 in the flow path 981 based on the output of the pressure sensor 213.

[0068] In this embodiment, as an example, the first heat exchanger 112 performs heat exchange without using an electrical driving source. In this case, the first heat exchanger 112 does not need to be electrically connected to the CPU 701.

[0069] In this embodiment, the CPU 701 can switch the heat pump system 1A between nine modes shown in FIG. 5 by automatically switching the heat pump unit 35, the first heat exchanger 112, the solar thermal collector 211, and the air heat exchanger 111 ON and OFF. In this embodiment, the first heat exchanger 112 performs heat exchange without using an electrical driving source. Turning the first heat exchanger 112 ON means supplying the first heat medium 391 and the second heat medium 392 to the first heat exchanger 112 to perform heat exchange. The solar thermal collector 211 heats the first heat medium 391 using heat from solar radiation without using an electrical driving source. Turning the solar thermal collector 211 ON means supplying the first heat medium 391 to the solar thermal collector 211 to heat the first heat medium 391. The CPU 701 does not have to be connected to the solar thermal collector 211.

[0070] The CPU 701 is electrically connected to the electrical configuration of the load-side equipment 212. The electrical configuration of the load-side equipment 212 of the heat pump system 1A will be described with reference to Fig. 4 .

[0071] The CPU 701 is electrically connected to the geothermal pump 744, pumps 771, 772, 773, 777, on-off valves 613, 614, 743, flow sensors 745, 774, 775, 776, 778, 779, and temperature sensors 734, 737, 738, 746, 781, 782, 783, 784, 785, 786, 787, 788, 789 of the load side equipment 212.

[0072] As an example, the geothermal pump 744 and the pumps 771, 772, and 773 are pumps (for example, inverter pumps) that can adjust the flow rate of the second heat medium 392. As an example, the pump 777 is a pump (for example, inverter pump) that can adjust the flow rate of the water 393.

[0073] Flow sensors 745, 774, 775, 776, and 778 output signals corresponding to the flow rate of second heat medium 392 flowing through the flow paths in which the respective flow sensors are installed to CPU 701. CPU 701 detects the flow rate of second heat medium 392 flowing through the flow paths based on the output of flow sensor 971. Flow sensor 779 outputs a signal corresponding to the flow rate of water 393 flowing through flow path 765 to CPU 701. CPU 701 detects the flow rate of water 393 flowing through flow path 765 based on the output of flow sensor 972.

[0074] Temperature sensors 734, 737, 738, 746, 781, 782, 783, 784, 785, 786, 787, 788, and 789 output signals corresponding to the temperatures of second heat medium 392 flowing through the flow paths in which the respective temperature sensors are installed to CPU 701. CPU 701 detects the temperatures of second heat medium 392 flowing through the flow paths based on the outputs of temperature sensors 734, 737, 738, 746, 781, 782, 783, 784, 785, 786, 787, 788, and 789. Temperature sensors 788 and 789 output signals corresponding to the temperatures of water 393 flowing through the flow paths in which the respective temperature sensors are installed to CPU 701. CPU 701 detects the temperatures of water 393 flowing through the flow paths based on the outputs of temperature sensors 788 and 789.

[0075] The CPU 701 controls the geothermal pump 744 and pumps 771 , 772 , 773 , 777 while referring to the flow rates and temperatures of the second heat medium 392 and the water 393 , thereby adjusting the flow rates of the second heat medium 392 and the water 393 .

[0076] The CPU 701 is electrically connected to the air conditioning heat pumps 601, 602. The CPU 701 controls the air conditioning heat pumps 601, 602, and uses the heat of the second heat medium 392 by a heat pump system to air condition the space (for example, a room, a greenhouse, etc.) in which the air conditioning heat pumps 601, 602 are installed.

[0077] The CPU 701 is electrically connected to the hot water supply heat pump 603. The CPU 701 controls the hot water supply heat pump 603, and heats the water 393 using the heat of the second heat medium 392 by the heat pump method.

[0078] In this embodiment, as an example, all the on-off valves including the on-off valve 927 are fixed-volume valves that cannot change the flow rate.

[0079] The operating modes of the heat pump system 1A will be described with reference to Fig. 5. As shown in table 95 in Fig. 5, modes 1 and 2 are modes that are set when cooling the primary side (i.e., the second heat medium 392 side). Modes 3, 4, 5, 6, 7, and 8 are modes that heat the primary side.

[0080] In mode 1, the heat pump unit 35 and the air heat exchanger 111 are set to ON, and the first heat exchanger 112 and the solar heat collector 211 are set to OFF. As shown in Fig. 6, in mode 1, the CPU 701 opens on-off valves 922, 923, 924, 926, 927, and 932, closes on-off valves 921, 925, 928, 929, 930, and 931, and drives pumps 961 and 962. The first heat medium 391 circulates through flow path 818, flow path 817, flow path 816, flow path 815, the zero-side heat exchanger 351, flow path 814, flow path 813, the air heat exchanger 111, flow path 812, flow path 822, and flow path 823 (see arrow 661). The second heat medium 392 circulates through the flow path 844, the flow path 843, the primary heat exchanger 352, the flow path 842, the flow path 841, the flow path 991, the load side equipment 212, and the flow path 992 (see arrow 681).

[0081] In mode 1, heat is exchanged between air and the first heat medium 391 in the air heat exchanger 111, and the first heat medium 391 is cooled. The cooled first heat medium 391 is supplied to the zero-side heat exchanger 351 of the heat pump unit 35. In the heat pump unit 35, heat is exchanged between the first heat medium 391 and the second heat medium 392 by a heat pump system, and the second heat medium 392 is cooled. The first heat medium 391 used for heat exchange in the heat pump unit 35 is sent to the air heat exchanger 111 and cooled. The second heat medium 392 cooled in the heat pump unit 35 is sent to the load-side equipment 212 and used in the load-side equipment 212. For example, in the air-conditioning heat pumps 601 and 602 (see FIG. 2 ), the temperature of the second heat medium 392 is used for cooling (the same applies to mode 2, which will be described later).

[0082] 5, in mode 2, the first heat exchanger 112 and the air heat exchanger 111 are set to ON, and the heat pump unit 35 and the solar heat collector 211 are set to OFF. As shown in Fig. 7, in mode 2, the CPU 701 opens on-off valves 922, 925, 926, 927, 929, 930, and 931, closes on-off valves 921, 923, 924, 928, and 932, and drives pumps 961 and 962. The first heat medium 391 circulates through flow path 818, flow path 821, the first heat exchanger 112, flow path 820, flow path 816, flow path 825, flow path 826, flow path 813, the air heat exchanger 111, flow path 812, flow path 822, and flow path 823 (see arrow 662). The second heat medium 392 circulates through the flow path 844, the flow path 846, the first heat exchanger 112, the flow path 845, the flow path 841, the flow path 991, the load side equipment 212, and the flow path 992 (see arrow 682).

[0083] In mode 2, in the air heat exchanger 111, heat is exchanged between the air and the first heat medium 391, and the first heat medium 391 is cooled. The cooled first heat medium 391 is supplied to the first heat exchanger 112. In the first heat exchanger 112, heat is exchanged between the first heat medium 391 and the second heat medium 392, and the second heat medium 392 is cooled. The first heat medium 391 used for heat exchange in the first heat exchanger 112 is sent to the air heat exchanger 111 and cooled. The second heat medium 392 cooled in the first heat exchanger 112 is sent to the load side equipment 212 and used in the load side equipment 212.

[0084] 5, in mode 3, the heat pump unit 35 and the solar thermal collector 211 are set to ON, and the first heat exchanger 112 and the air heat exchanger 111 are set to OFF. As shown in Fig. 8, in mode 3, the CPU 701 opens on-off valves 921, 923, 924, 926, 928, 930, and 932, closes on-off valves 922, 925, 927, 929, and 931, and drives pumps 961 and 962. The first heat medium 391 circulates through flow path 818, flow path 817, flow path 816, flow path 815, the zero-side heat exchanger 351, flow path 814, flow path 826, flow path 824, flow path 822, flow path 811, flow path 981, the solar thermal collector 211, flow path 982, and flow path 819 (see arrow 663). The second heat medium 392 circulates through the flow path 844, the flow path 843, the primary heat exchanger 352, the flow path 842, the flow path 841, the flow path 991, the load side equipment 212, and the flow path 992 (see arrow 683).

[0085] In mode 3, in the solar thermal collector 211, the first heat medium 391 is heated by heat from solar radiation. The heated first heat medium 391 is supplied to the zero-side heat exchanger 351 of the heat pump unit 35. In the heat pump unit 35, heat is exchanged between the first heat medium 391 and the second heat medium 392 by a heat pump system, and the second heat medium 392 is heated. The first heat medium 391 used for heat exchange in the heat pump unit 35 is sent to the solar thermal collector 211 and heated. The second heat medium 392 heated in the heat pump unit 35 is sent to the load-side equipment 212 and used in the load-side equipment 212. For example, in the air-conditioning heat pumps 601, 602 (see FIG. 2), the temperature of the second heat medium 392 is used for heating, or in the hot water supply heat pump 603 (see FIG. 2) to heat water 393 (the same applies to modes 4 to 8 described below).

[0086] As shown in Fig. 5, in mode 4, the heat pump unit 35 and the air heat exchanger 111 are set to ON, and the first heat exchanger 112 and the solar heat collector 211 are set to OFF. As shown in Fig. 6, in mode 4, the on-off valves 921 to 932 are controlled and the pumps 961 and 962 are driven, similarly to mode 1. The first heat medium 391 and the second heat medium 392 flow through the same flow paths as in mode 1 (see arrows 661 and 681).

[0087] In mode 4, in the air heat exchanger 111, heat is exchanged between the air and the first heat medium 391, and the first heat medium 391 is heated. The heated first heat medium 391 is supplied to the zero-side heat exchanger 351 of the heat pump unit 35. In the heat pump unit 35, heat is exchanged between the first heat medium 391 and the second heat medium 392 by a heat pump system, and the second heat medium 392 is heated. The first heat medium 391 used for heat exchange in the heat pump unit 35 is sent to the air heat exchanger 111 and heated. The second heat medium 392 heated in the heat pump unit 35 is sent to the load-side equipment 212 and used in the load-side equipment 212.

[0088] 5, in mode 5, the heat pump unit 35, the solar thermal collector 211, and the air heat exchanger 111 are set to ON, and the first heat exchanger 112 is set to OFF. As shown in Fig. 9, in mode 5, the CPU 701 opens on-off valves 921, 922, 923, 924, and 932, closes on-off valves 925, 926, 927, 928, 929, 930, and 931, and drives pumps 961 and 962. The first heat medium 391 circulates through flow path 818, flow path 817, flow path 816, flow path 815, the zero-side heat exchanger 351, flow path 814, flow path 813, the air heat exchanger 111, flow path 812, flow path 811, flow path 981, the solar thermal collector 211, flow path 982, and flow path 819 (see arrow 665). The second heat medium 392 circulates through the flow path 844, the flow path 843, the primary heat exchanger 352, the flow path 842, the flow path 841, the flow path 991, the load side equipment 212, and the flow path 992 (see arrow 685).

[0089] In mode 5, heat is exchanged between the air and the first heat medium 391 in the air heat exchanger 111, and the first heat medium 391 is heated. The heated first heat medium 391 is further heated in the solar thermal collector 211 by heat of solar radiation. The heated first heat medium 391 is supplied to the zero-side heat exchanger 351 of the heat pump unit 35. In the heat pump unit 35, heat is exchanged between the first heat medium 391 and the second heat medium 392 by a heat pump system, and the second heat medium 392 is heated. The first heat medium 391 used for heat exchange in the heat pump unit 35 is sent to the air heat exchanger 111 and heated. The second heat medium 392 heated in the heat pump unit 35 is sent to the load-side equipment 212 and used in the load-side equipment 212.

[0090] 5, in mode 6, the first heat exchanger 112 and the solar heat collector 211 are set to ON, and the heat pump unit 35 and the air heat exchanger 111 are set to OFF. As shown in Fig. 10, in mode 6, the CPU 701 opens on-off valves 921, 925, 926, 929, 928, and 931, closes on-off valves 922, 923, 924, 927, 930, and 932, and drives pumps 961 and 962. The first heat medium 391 circulates through flow path 818, flow path 821, the first heat exchanger 112, flow path 820, flow path 816, flow path 825, flow path 824, flow path 822, flow path 811, flow path 981, the solar heat collector 211, flow path 982, and flow path 819 (see arrow 666). The second heat medium 392 circulates through the flow path 844, the flow path 846, the first heat exchanger 112, the flow path 845, the flow path 841, the flow path 991, the load side equipment 212, and the flow path 992 (see arrow 686).

[0091] In mode 6, in the solar heat collector 211, the first heat medium 391 is heated by heat of solar radiation from the sun. The heated first heat medium 391 is supplied to the first heat exchanger 112. In the first heat exchanger 112, heat is exchanged between the first heat medium 391 and the second heat medium 392, and the second heat medium 392 is heated. The first heat medium 391 used for the heat exchange in the first heat exchanger 112 is sent to the solar heat collector 211 and heated. The second heat medium 392 heated in the first heat exchanger 112 is sent to the load side equipment 212 and used in the load side equipment 212.

[0092] As shown in Fig. 5, in mode 7, the first heat exchanger 112 and the air heat exchanger 111 are set to ON, the heat pump unit 35 and the solar heat collector 211 are set to OFF, and the second heat medium 392 is heated. As shown in Fig. 7, in mode 7, the on-off valves 921 to 932 are controlled and the pumps 961 and 962 are driven, similar to mode 2. The first heat medium 391 and the second heat medium 392 flow through the same flow paths as in mode 2 (see arrows 662 and 682).

[0093] In mode 7, in the air heat exchanger 111, heat is exchanged between the air and the first heat medium 391, and the first heat medium 391 is heated. The heated first heat medium 391 is supplied to the first heat exchanger 112. In the first heat exchanger 112, heat is exchanged between the first heat medium 391 and the second heat medium 392, and the second heat medium 392 is heated. The first heat medium 391 used for heat exchange in the first heat exchanger 112 is sent to the air heat exchanger 111 and heated. The second heat medium 392 heated in the first heat exchanger 112 is sent to the load side equipment 212 and used in the load side equipment 212.

[0094] 5, in mode 8, the first heat exchanger 112, the solar thermal collector 211, and the air heat exchanger 111 are set to ON, and the heat pump unit 35 is set to OFF. As shown in Fig. 11, in mode 8, the CPU 701 opens on-off valves 921, 922, 925, 929, 930, and 931, closes on-off valves 923, 924, 926, 927, 928, and 932, and drives pumps 961 and 962. The first heat medium 391 circulates through flow path 818, flow path 821, the first heat exchanger 112, flow path 820, flow path 816, flow path 825, flow path 826, flow path 813, the air heat exchanger 111, flow path 812, flow path 811, flow path 981, the solar thermal collector 211, flow path 982, and flow path 819 (see arrow 668). The second heat medium 392 circulates through the flow path 844, the flow path 846, the first heat exchanger 112, the flow path 845, the flow path 841, the flow path 991, the load side equipment 212, and the flow path 992 (see arrow 688).

[0095] In mode 8, heat is exchanged between the air and the first heat medium 391 in the air heat exchanger 111, and the first heat medium 391 is heated. The heated first heat medium 391 is sent to the solar thermal collector 211 and further heated by heat of solar radiation from the sun. The heated first heat medium 391 is supplied to the first heat exchanger 112. In the first heat exchanger 112, heat is exchanged between the first heat medium 391 and the second heat medium 392, and the second heat medium 392 is heated. The first heat medium 391 used for heat exchange in the first heat exchanger 112 is sent to the air heat exchanger 111 and heated. The second heat medium 392 heated in the first heat exchanger 112 is sent to the load side equipment 212 and used in the load side equipment 212.

[0096] The summer heat radiation mode shown in table 95 of Fig. 5 is a mode that is implemented as needed in summer. As shown in table 95 of Fig. 5, in the summer heat radiation mode, the solar heat collector 211 and the air heat exchanger 111 are set to ON, and the first heat exchanger 112 and the heat pump unit 35 are set to OFF. As shown in Fig. 12, in the summer heat radiation mode, the CPU 701 opens on-off valves 921, 922, 924, 929, and 930, closes on-off valves 923, 925, 926, 927, and 928, and drives the pump 961. The first heat medium 391 circulates through flow path 818, flow path 817, flow path 816, flow path 825, flow path 826, flow path 813, the air heat exchanger 111, flow path 812, flow path 811, the solar heat collector 211, flow path 982, and flow path 819 (see arrow 669).

[0097] In summer, the temperature of the first heat medium 391 heated by the heat of solar radiation from the sun in the solar heat collector 211 tends to be higher than in spring, autumn, and winter. The first heat medium 391 heated in the solar heat collector 211 is sent to the air heat exchanger 111. In the air heat exchanger 111, heat is exchanged between the air and the first heat medium 391, and heat is dissipated from the first heat medium 391. This lowers the temperature of the first heat medium 391.

[0098] The data table 96 will be described with reference to Fig. 13. The data table 96 is stored in the ROM 702. As shown in Fig. 13, the data table 96 stores the equipment status and the first to third modes in association with each other.

[0099] The data table 96 is a data table for determining the first mode, second mode, or third mode from the states of the air-conditioning heat pumps 601, 602 and the hot water supply heat pump 603 in the processing of S904 (see FIG. 25) described later.

[0100] In the first mode, "air conditioning heat pumps 601, 602 are cooling" is marked with "X". Also, at least one of "air conditioning heat pumps 601, 602 are heating" and "hot water supply heat pump 603 is ON" is marked with "O". This indicates that if the air conditioning heat pumps 601, 602 are not cooling, but at least one of "air conditioning heat pumps 601, 602 are heating" and "hot water supply heat pump 603 is ON", the first mode is determined in the processing of S904 (see FIG. 25 ) described later. Note that if at least one of the air conditioning heat pumps 601 and 602 is cooling, "air conditioning heat pumps 601, 602 are cooling" is determined as "O". Also, if at least one of the air conditioning heat pumps 601 and 602 is heating, "air conditioning heat pumps 601, 602 are heating" is determined as "O".

[0101] The second mode is marked with "○" for "air conditioning heat pumps 601, 602 are cooling," "×" for "air conditioning heat pumps 601, 602 are heating," and "×" for "hot water supply heat pump 603 is ON." This indicates that if the air conditioning heat pumps 601, 602 are cooling, the air conditioning heat pumps 601, 602 are not heating, and the hot water supply heat pump 603 is not ON, the second mode is determined in the processing of S904 (see FIG. 25) described later.

[0102] Similarly, when "air conditioning heat pumps 601, 602 are cooling" is "x", "air conditioning heat pumps 601, 602 are heating" is "x", and "hot water supply heat pump 603 is ON" is "x", the second mode is set. When "air conditioning heat pumps 601, 602 are cooling" is "○", "air conditioning heat pumps 601, 602 are heating" is "×", and "hot water supply heat pump 603 is ON" is "○", the third mode is determined in the processing of S904 (see FIG. 25).

[0103] The data table 97 will be described with reference to FIG. 14. The data table 97 is stored in the ROM 702. As shown in FIG. 14, the data table 97 stores a correspondence between a mode, a condition, and a heating / cooling judgment. The first mode is associated with the heating / cooling judgment "heating mode." There are no conditions. Similarly, the second mode is associated with the heating / cooling judgment "cooling mode."

[0104] The third mode condition "T787>734" is associated with the heating / cooling determination "cooling mode." The third mode condition "T787<734" is associated with the heating / cooling determination "heating mode." T787 is the temperature of the second heat medium 392 detected by the temperature sensor 787 (see FIG. 2). T734 is the temperature of the second heat medium 392 detected by the temperature sensor 734 (see FIG. 2).

[0105] The first validity / invalidity determination graph 98 will be described with reference to Figure 15. The first validity / invalidity determination graph 98 is a graph for determining whether it is valid to use the underground heat exchanger 604 in the heating mode, whether it is valid to use the underground heat exchanger 604 in the cooling mode, and whether it is invalid to use the underground heat exchanger 604. A program for making the determinations indicated in the first validity / invalidity determination graph 98 in S906 (see Figure 25), which will be described later, is stored in the ROM 702.

[0106] As shown in the first validity / invalidity determination graph 98, the horizontal axis represents the temperature T737 of the second heat medium 392 flowing through the loop flow path 71, detected by the temperature sensor 737. The vertical axis represents the validity / invalidity determination. When the temperature T737 is greater than the temperature T11 (e.g., 17°C) and less than the temperature T12 (e.g., 30°C), the determination is invalid. In other words, it is determined that use of the underground heat exchanger 604 is invalid.

[0107] If temperature T737 is equal to or less than temperature T11, it is determined that it is effective to use the ground heat exchanger 604 in a heating mode. If temperature T737 is equal to or greater than temperature T12, it is determined that it is effective to use the ground heat exchanger 604 in a cooling mode.

[0108] The second validity / invalidity determination graph 99 will be described with reference to Figure 16. The second validity / invalidity determination graph 99 is a graph for determining whether it is valid or invalid to use the underground heat exchanger 604 based on a change in temperature of the second heat medium 392 that actually flows through the underground heat exchanger 604. A program for making the determination indicated in the second validity / invalidity determination graph 99 in S908 (see Figure 25) described later is stored in the ROM 702.

[0109] As shown in the second validity / invalidity determination graph 99, the horizontal axis is T746-T737. That is, it is the value obtained by subtracting the temperature T737 of the second heat medium 392 detected by the temperature sensor 746 downstream of the underground heat exchanger 604 from the temperature T746 of the second heat medium 392 detected by the temperature sensor 746 upstream of the underground heat exchanger 604. The vertical axis indicates validity / invalidity determination. When T746-T737, which is the range of validity / invalidity determination, is greater than temperature T21 (e.g., -1°C) and less than temperature T22 (e.g., 1°C), an invalidity determination is made. That is, it is determined that use of the underground heat exchanger 604 is invalid.

[0110] If T746-T737 is equal to or less than temperature T21, it is determined that it is effective to use the ground heat exchanger 604 in a cooling mode. If T746-T737 is equal to or greater than temperature T22, it is determined that it is effective to use the ground heat exchanger 604 in a heating mode.

[0111] The geothermal pump control graph 100 will be described with reference to Figure 17. The geothermal pump control graph 100 is a graph for controlling the geothermal pump 744 based on the flow rates detected by the flow rate sensors 774, 775, 776, and 972. A program for controlling the geothermal pump 744 shown in the geothermal pump control graph 100 in S914 (see Figure 26) described later is stored in the ROM 702.

[0112] As shown in the geothermal pump control graph 100, the horizontal axis represents the flow rate of the geothermal pump 744 when the second heat medium 392 flows from the loop flow path 71 to the geothermal heat exchanger 604. The vertical axis represents the operating frequency of the geothermal pump 744. The geothermal pump control graph 100 defines a lower limit operating frequency F1 and an upper limit operating frequency F2, and then calculates the flow rate. |±VM1±VM2±VM3-VM4| The geothermal pump 744 is controlled so that

[0113] Note that the first flow rate detected by the processing of S910 (described later) using flow sensor 972 (see FIG. 1) is designated VM1. The second flow rate detected by the processing of S911 (described later) using flow sensor 774 (see FIG. 2) is designated VM2. The third flow rate detected by the processing of S912 (described later) using flow sensor 775 (see FIG. 2) is designated VM3. The fourth flow rate detected by the processing of S913 (described later) using flow sensor 776 (see FIG. 2) is designated VM4.

[0114] |±VM1±VM2±VM3-VM4| The symbols in the above symbols will be explained. When at least one of the first heat exchanger 112 and the heat pump unit 35 is heating, the symbol is "+VM1", and when at least one of the first heat exchanger 112 and the heat pump unit 35 is cooling, the symbol is "-VM1". When the air conditioning heat pump 601 is cooling, the symbol is "+VM2", and when the air conditioning heat pump 601 is heating, the symbol is "-VM2". When the air conditioning heat pump 602 is cooling, the symbol is "+VM3", and when the air conditioning heat pump 602 is heating, the symbol is "-VM3". When the hot water supply heat pump 603 is operating, the symbol is always "-" or "-VM4".

[0115] The higher the operating frequency, the greater the flow rate of the second heat medium 392 flowed by the geothermal pump 744. In the geothermal pump control graph 100, the minimum operating frequency is designated as F1 and the maximum operating frequency is designated as F2. F2 is, for example, the rated frequency (e.g., 60 Hz or 50 Hz). In the present embodiment, as an example, F2 is set to 60 Hz. If the operating frequency of the geothermal pump 744 is lowered too much, the flow rate of the second heat medium 392 may become zero even though the geothermal pump 744 is operating (so-called "flow rate reduction"). F2 is set to an operating frequency that does not cause a flow rate reduction. In the present embodiment, as an example, F1 is set to 15 Hz.

[0116] VMA is the value of |±VM1±VM2±VM3-VM4| when the operating frequency is F1. VMB is the value of |±VM1±VM2±VM3-VM4| when the operating frequency is F2. When the operating frequency is in the range of F1 or more and F2 or less, the flow rate of the second heat medium 392 flowed by the geothermal pump 744 is controlled to be |±VM1±VM2±VM3-VM4|.

[0117] The processing executed by the CPU 701 will be described. First, the heating operation processing executed by the CPU 701 will be described with reference to Figs. 18 to 22. The heating operation processing is executed, for example, when an instruction to perform heating operation (i.e., operation of the hot water supply heat pump 603 or heating by the air conditioning heat pumps 601, 602) is input from devices of the load-side equipment 212 (e.g., the hot water supply heat pump 603 and the air conditioning heat pumps 601, 602). The CPU 701 reads out a program for the heating operation processing from the ROM 702 and loads it into the RAM 703. The CPU 701 performs the heating operation processing in accordance with the program for the heating operation processing.

[0118] In the operation start process, first, it is determined whether the current time is within the daylight hours (S101). The daylight hours are set in advance and stored in the ROM 702. The setting of the daylight hours is, for example, 9:00 to 16:00. The setting of the daylight hours may be changed depending on the season.

[0119] If the current time is within the daylight hours (S101: YES), the amount of solar radiation is detected based on the output of the solar radiation detector 891 (S102). Next, it is determined whether the amount of solar radiation detected in S102 is equal to or greater than a reference value (S103). The reference value is set in advance and stored in the ROM 702. The reference value is, for example, 800 W / m 2 is.

[0120] If the amount of solar radiation is equal to or greater than the reference value (S103: YES), the mode for determining the state of the first supply temperature in S108, which will be described later, is set to mode 8 (S104). The first supply temperature will be described later.

[0121] In S104, the CPU 701 sets the first heat exchanger 112, the solar heat collector 211, and the air heat exchanger 111 to ON and sets the heat pump unit 35 to OFF, thereby setting mode 8 (see FIGS. 5 and 11). As described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. This causes the first heat medium 391 and the second heat medium 392 to flow, making it possible to determine the state of the first supply temperature in S108, which will be described later. In S104, it is sufficient that the first heat medium 391 and the second heat medium 392 flow, and heat exchange does not necessarily have to occur in the first heat exchanger 112, the solar heat collector 211, and the air heat exchanger 111.

[0122] If the current time is not within the sunshine hours in S101 (S101: NO), or if the amount of solar radiation is not equal to or greater than the reference value in S103 (S103: NO), the mode for determining the state of the first supply temperature in S108, which will be described later, is set to mode 7 (S105).

[0123] In S105, the CPU 701 sets the first heat exchanger 112 and the air heat exchanger 111 to ON, and sets the heat pump unit 35 and the solar heat collector 211 to OFF, thereby setting mode 7 (see FIGS. 5 and 7). As described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. This causes the first heat medium 391 and the second heat medium 392 to flow, making it possible to determine the state of the first supply temperature in S108, which will be described later. In S105, it is sufficient that the first heat medium 391 and the second heat medium 392 flow, and heat exchange does not necessarily have to occur in the first heat exchanger 112 and the air heat exchanger 111.

[0124] The following processes of S106 to S108 and S201 to S210 (see FIG. 19) are executed during operation for, for example, one minute in the mode set in S104 or S105, and one of the operation start modes from mode 1 to mode 8 is determined.

[0125] After S104 or S105 is executed, a first supply temperature is detected (S106) based on the output of the temperature sensor 946. The first supply temperature is the temperature of the first heat medium 391 supplied to at least one of the first heat exchanger 112 and the heat pump section 35.

[0126] Next, a second supply temperature is detected (S107) based on the output of the temperature sensor 953. The second supply temperature is the temperature of the second heat medium 392 supplied to at least one of the first heat exchanger 112 and the heat pump section 35.

[0127] Next, it is determined whether the first supply temperature detected in S106 is equal to or higher than a first temperature (S108). The first temperature is the sum of the second supply temperature detected in S107 and a first predetermined temperature. The first predetermined temperature is, for example, 5°C.

[0128] If the first supply temperature is equal to or higher than the first temperature (S108: YES), as shown in FIG. 19, the CPU 701 determines to set the mode to modes 6 to 8, which are modes that use the first heat exchanger 112, from modes 3 to 8 (see FIG. 5) that heat the primary side (i.e., the second heat medium 392 side) (S201).

[0129] Next, similar to S101, it is determined whether the current time is within the daylight hours (S202). If the current time is within the daylight hours (S202: YES), similar to S102, the amount of solar radiation is detected based on the output of the solar radiation detector 891 (S203). Next, similar to S103, it is determined whether the amount of solar radiation detected in S203 is equal to or greater than a reference value (S204).

[0130] If the amount of solar radiation is equal to or greater than the reference value (S204: YES), similar to S107, a second supply temperature is detected based on the output of temperature sensor 953 (S205). Next, the outside air temperature is detected based on the output of temperature sensor 948 (S206). Next, it is determined whether the outside air temperature detected in S206 is equal to or greater than a second temperature (S207). The second temperature is the sum of the second supply temperature detected in S205 and a second predetermined temperature. The second predetermined temperature is, for example, 5°C.

[0131] If the outside air temperature is equal to or higher than the second temperature (S207: YES), the operation start mode is set to mode 8 (S208). In S208, the CPU 701 sets the solar heat collector 211, the first heat exchanger 112, and the air heat exchanger 111 to ON, and sets the heat pump unit 35 to OFF, thereby setting the operation mode to mode 8 (see FIGS. 5 and 11). Also, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. Next, the process proceeds to S211, which will be described later.

[0132] If the outside air temperature is not equal to or higher than the second temperature (S207: NO), the operation start mode is set to mode 6 (S209). In S209, the CPU 701 sets the solar heat collector 211 and the first heat exchanger 112 to ON, and sets the heat pump unit 35 and the air heat exchanger 111 to OFF, thereby setting mode 6 (see FIGS. 5 and 10). Also, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. Next, the process proceeds to S211, which will be described later.

[0133] If the current time is not within the sunshine hours in S202 (S202: NO), or if the amount of solar radiation is not equal to or greater than the reference value in S204 (S204: NO), the operation start mode is set to mode 7 (S210). In S210, the CPU 701 sets the first heat exchanger 112 and the air heat exchanger 111 to ON and sets the heat pump unit 35 and the solar heat collector 211 to OFF, thereby setting mode 7 (see FIGS. 5 and 7). Also, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. Next, the process proceeds to S211.

[0134] In S208, S209, and S210, it is determined whether five minutes have elapsed since operation was started in any of mode 6, mode 7, and mode 8, which are modes that use the first heat exchanger 112 (S211). Note that the time may be a period other than five minutes. If five minutes have not elapsed (S211: NO), the system waits.

[0135] If five minutes have elapsed (S211: YES), the CPU 701 performs the processes of S301 to S320 shown in Fig. 20. In the processes of S301 to S320 below, after operation has started in modes 6 to 8 in which the second heat medium 392 is heated using the first heat exchanger 112, the mode is switched if the surrounding environment changes, for example, due to a change in the weather.

[0136] First, similar to S106, a first supply temperature is detected (S301) based on the output of temperature sensor 946. Next, similar to S107, a second supply temperature is detected (S302) based on the output of temperature sensor 953.

[0137] Next, similarly to S108, it is determined whether the first supply temperature detected in S301 is equal to or higher than the first temperature (S303). The first temperature in S303 is the sum of the second supply temperature detected in S302 and a first predetermined temperature. The first predetermined temperature is, for example, 5°C. The first predetermined temperature in S303 may be different from the first predetermined temperature in S108. For example, the first predetermined temperature in S108 may be 5°C, and the first predetermined temperature in S303 may be 3°C.

[0138] If the first supply temperature is equal to or higher than the first temperature (S303: YES), it is determined to continue mode 6 to 8 set in any one of S208, S209, and S210 (S304). In the following description, the operating mode may be referred to as the "stay mode."

[0139] Next, similar to S202, it is determined whether the current time is within the daylight hours (S305). If the current time is within the daylight hours (S305: YES), similar to S203, the amount of solar radiation is detected based on the output of the solar radiation detector 891 (S306). Next, similar to S204, it is determined whether the amount of solar radiation detected in S306 is equal to or greater than a reference value (S307).

[0140] If the amount of solar radiation is equal to or greater than the reference value (S307: YES), a second supply temperature is detected based on the output of temperature sensor 953 (S308), similar to S205. Next, an outside air temperature is detected based on the output of temperature sensor 948 (S309), similar to S206. Next, a determination is made as to whether the outside air temperature detected in S309 is equal to or greater than a second temperature (S310), similar to S207. The second temperature in S310 is the sum of the second supply temperature detected in S308 and a second predetermined temperature. The second predetermined temperature is, for example, 5°C. Note that the second predetermined temperature in S310 may be different from the second predetermined temperature in S207. For example, the second predetermined temperature in S207 may be 5°C, and the second predetermined temperature in S303 may be 7°C.

[0141] If the outside air temperature is equal to or higher than the second temperature (S310: YES), it is determined whether or not a state in which it is within sunshine hours, the amount of solar radiation is equal to or higher than a reference value, and the outside air temperature is equal to or higher than the second temperature has continued for a predetermined time or longer (S311). That is, it is determined whether or not the same state as S305: YES, S307: YES, and S310: YES has continued for a predetermined time or longer (S311). The predetermined time is, for example, one minute (the same applies to S313, S315, S511, S513, S515, S611, and S613 described below). If this has not continued for the predetermined time (S311: NO), the process returns to S301.

[0142] If the state in which it is during sunshine hours, the amount of solar radiation is equal to or greater than the reference value, and the outside air temperature is equal to or greater than the second temperature continues for a predetermined time or longer (S311: YES), the selected mode is determined to be mode 8 (S312). The selected mode is a mode that is a candidate for setting the mode. Next, the process proceeds to S318, which will be described later.

[0143] If the outside air temperature is not equal to or higher than the second temperature in S310 (S310: NO), it is determined whether a state in which it is within sunshine hours, the amount of solar radiation is equal to or higher than a reference value, and the outside air temperature is not equal to or higher than the second temperature has continued for a predetermined time or longer (S313). That is, it is determined whether a state the same as S305: YES, S307: YES, S310: NO has continued for a predetermined time or longer (S313). If this has not continued for a predetermined time or longer (S313: NO), the process returns to S301.

[0144] If the state continues for a predetermined time or longer during sunshine hours, with the amount of solar radiation equal to or greater than the reference value, and the outside air temperature not equal to or greater than the second predetermined temperature (S313: YES), the selected mode is determined to be mode 6 (S314). Next, the process proceeds to S318, which will be described later.

[0145] If the amount of solar radiation is not equal to or greater than the reference value in S307 (S307: NO), it is determined whether the state in which it is within the sunshine hours and the amount of solar radiation is not equal to or greater than the reference value has continued for a predetermined time or more (S315). That is, it is determined whether the same state as S305: YES, S307: NO has continued for a predetermined time or more (S315). If this has not continued for the predetermined time (S315: NO), the process returns to S301.

[0146] If the state in which the daylight hours are present and the amount of solar radiation is below the reference value continues for a predetermined time or more (S315: YES), the selected mode is determined to be mode 7 (S316). Also, if the current time is not within the daylight hours in S305 (S305: NO), the selected mode is determined to be mode 7 (S316). Next, the process proceeds to S318, which will be described later.

[0147] If it is determined in S303 that the first supply temperature is not equal to or higher than the first temperature (S303: NO), the selected mode is determined to be a mode that uses the heat pump unit 35 (S317). The modes that use the heat pump unit 35 are modes 3 to 5 (see FIG. 5).

[0148] Next, it is determined whether the selected mode set in S312, S314, S316, or S317 is the same as the stay mode (S318). If the selected mode and the stay mode are the same (S318: YES), the process returns to S301. That is, driving continues in the driving mode.

[0149] If the selected mode and the stay mode are different (S318: NO), it is determined whether the selected mode is a mode that uses the heat pump unit 35 (S319). If the selected mode is determined to be a mode that uses the heat pump unit 35 in S317 (S319: YES), the process proceeds to S401 (see FIG. 21) described later. As a result, in S408, S409, and S410 (see FIG. 21) described later, operation is started in one of modes 3 to 5 that use the heat pump unit 35.

[0150] If the selected mode is not a mode that uses the heat pump unit 35 (S319: NO), operation in the selected mode is initiated (S320). Next, the process returns to S301. By repeating S301 to S320, the mode is switched according to the external environment, and operation of the heat pump system 1A continues. For example, if the outside air temperature falls below the second temperature while the heat pump system 1A is operating in mode 8 (S310: NO), the mode is switched to mode 6 (S314 and S320). Furthermore, if the amount of solar radiation falls below a reference value while the heat pump system 1A is operating in mode 6 (S307: NO), the mode is switched to mode 7 (S316 and S320).

[0151] In S108 (see FIG. 18), if the first supply temperature is not equal to or higher than the first temperature (S108: NO), as shown in FIG. 21, the CPU 701 determines to set the mode to modes 3 to 5, which are modes that use the heat pump unit 35, from modes 3 to 8 (see FIG. 5) that heat the primary side (i.e., the second heat medium 392 side) (S401).

[0152] Next, similar to S101, it is determined whether the current time is within the daylight hours (S402). If the current time is within the daylight hours (S402: YES), similar to S102, the amount of solar radiation is detected based on the output of the solar radiation detector 891 (S403). Next, similar to S103, it is determined whether the amount of solar radiation detected in S403 is equal to or greater than a reference value (S404).

[0153] If the amount of solar radiation is equal to or greater than the reference value (S404: YES), similarly to S107, a second supply temperature is detected based on the output of temperature sensor 953 (S405). Next, the outside air temperature is detected based on the output of temperature sensor 948 (S406). Next, it is determined whether the outside air temperature detected in S406 is equal to or greater than a second temperature (S407). The second temperature in S407 is the sum of the second supply temperature detected in S406 and a second predetermined temperature. The second predetermined temperature is, for example, 5°C.

[0154] If the outside air temperature is equal to or higher than the second temperature (S407: YES), the operation start mode is set to mode 5 (S408). In S408, the CPU 701 sets the solar heat collector 211, the air heat exchanger 111, and the heat pump unit 35 to ON, and sets the first heat exchanger 112 to OFF, thereby setting mode 5 (see FIGS. 5 and 9). Also, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. Next, the process proceeds to S411, which will be described later.

[0155] If the outside air temperature is not equal to or higher than the second temperature (S407: NO), the operation start mode is set to mode 3 (S409). In S409, the CPU 701 sets the solar heat collector 211 and the heat pump unit 35 to ON, and sets the first heat exchanger 112 and the air heat exchanger 111 to OFF, thereby setting mode 3 (see FIGS. 5 and 8). Also, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961, 962 are driven. Next, the process proceeds to S411, which will be described later.

[0156] If the current time is not within the sunshine hours in S402 (S402: NO), or if the amount of solar radiation is not equal to or greater than the reference value in S404 (S404: NO), the operation start mode is set to mode 4 (S410). In S410, the CPU 701 sets the heat pump unit 35 and the air heat exchanger 111 to ON and sets the first heat exchanger 112 and the solar heat collector 211 to OFF, thereby setting mode 4 (see FIGS. 5 and 6). Also, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. Next, the process proceeds to S411.

[0157] In S408, S409, and S410, it is determined whether five minutes have passed since operation was started in any of mode 3, mode 4, and mode 5, which are modes that use the heat pump unit 35 (S411). Note that the time may be a period other than five minutes. If five minutes have not passed (S411: NO), the process waits.

[0158] If five minutes have elapsed (S411: YES), the CPU 701 performs the processes of S501 to S520 shown in Fig. 22. In the processes of S501 to S520 below, after operation has started in modes 3 to 5 in which the heat pump unit 35 is used to heat the second heat medium 392, the mode is switched if the external environment changes, such as the weather changes.

[0159] 22, similar to S106, a first supply temperature is detected based on the output of temperature sensor 946 (S501). Then, similar to S107, a second supply temperature is detected based on the output of temperature sensor 953 (S502).

[0160] Next, it is determined whether the first supply temperature detected in S501 is equal to or higher than the first temperature (S503). The first temperature in S503 is the sum of the second supply temperature detected in S502 and a first predetermined temperature. The first predetermined temperature is, for example, 5°C. The first predetermined temperature in S503 may be different from the first predetermined temperature in S108. For example, the first predetermined temperature in S108 may be 5°C, and the first predetermined temperature in S503 may be 3°C.

[0161] If the first supply temperature is not equal to or higher than the first temperature (S503: NO), it is determined to continue mode 3 to 5 set in any of S408, S409, and S410 (S504). Next, it is determined whether the current time is within the daylight hours (S505). If the current time is within the daylight hours (S505: YES), the amount of solar radiation is detected based on the output of the solar radiation detector 891 (S506). Next, it is determined whether the amount of solar radiation detected in S306 is equal to or higher than a reference value (S507).

[0162] If the amount of solar radiation is equal to or greater than the reference value (S507: YES), a second supply temperature is detected based on the output of temperature sensor 953 (S508). Next, the outside air temperature is detected based on the output of temperature sensor 948 (S509). Next, similar to S207, it is determined whether the outside air temperature detected in S309 is equal to or greater than the second temperature (S510). The second temperature in S510 is the sum of the second supply temperature detected in S508 and a second predetermined temperature. The second predetermined temperature is, for example, 5°C. Note that the second predetermined temperature in S510 may be different from the second predetermined temperature in S207. For example, the second predetermined temperature in S207 may be 5°C, and the second predetermined temperature in S510 may be 7°C.

[0163] If the outside air temperature is equal to or higher than the second temperature (S510: YES), it is determined whether or not a state in which it is within sunshine hours, the amount of solar radiation is equal to or higher than a reference value, and the outside air temperature is equal to or higher than the second temperature has continued for a predetermined time or longer (S511). That is, it is determined whether or not the same state as S505: YES, S507: YES, and S510: YES has continued for a predetermined time or longer (S511). If it has not continued for a predetermined time or longer (S511: NO), the process returns to S501.

[0164] If the state in which it is within sunshine hours, the amount of solar radiation is equal to or greater than the reference value, and the outside air temperature is equal to or greater than the second temperature continues for a predetermined time or longer (S511: YES), the selected mode is determined to be mode 5 (S512). Next, the process proceeds to S518, which will be described later.

[0165] If the outside air temperature is not equal to or higher than the second temperature in S510 (S510: NO), it is determined whether a state in which it is within sunshine hours, the amount of solar radiation is equal to or higher than a reference value, and the outside air temperature is not equal to or higher than the second temperature has continued for a predetermined time or longer (S513). That is, it is determined whether a state identical to S505: YES, S507: YES, and S510: NO has continued for a predetermined time or longer (S513). If this has not continued for a predetermined time or longer (S513: NO), the process returns to S501.

[0166] If the state continues for a predetermined time or longer during sunshine hours, with the amount of solar radiation equal to or greater than the reference value, and the outside air temperature not equal to or greater than the second predetermined temperature (S513: YES), the selected mode is determined to be mode 3 (S514). Next, the process proceeds to S518, which will be described later.

[0167] If the amount of solar radiation is not equal to or greater than the reference value in S507 (S507: NO), it is determined whether the state in which it is within the sunshine hours and the amount of solar radiation is not equal to or greater than the reference value has continued for a predetermined time or more (S515). That is, it is determined whether the same state as S505: YES, S507: NO has continued for a predetermined time or more (S515). If this has not continued for the predetermined time (S515: NO), the process returns to S501.

[0168] If the state in which the daylight hours are present and the amount of solar radiation is below the reference value continues for a predetermined time or more (S515: YES), the selected mode is determined to be mode 4 (S516). Also, if the current time is not within the daylight hours in S505 (S505: NO), the selected mode is determined to be mode 4 (S516). Next, the process proceeds to S518, which will be described later.

[0169] If it is determined in S503 that the first supply temperature is equal to or higher than the first temperature (S503: YES), the selected mode is determined to be a mode that uses the first heat exchanger 112 (S517). The modes that use the first heat exchanger 112 are modes 6 to 8 (see FIG. 5).

[0170] Next, it is determined whether the selected mode set in S512, S514, S516, or S517 is the same as the stay mode (S518). If the selected mode and the stay mode are the same (S518: YES), the process returns to S501. That is, driving continues in the driving mode.

[0171] If the selected mode and the stay mode are different (S518: NO), it is determined whether the selected mode is a mode using the first heat exchanger 112 (S519). If the selected mode is determined to be a mode using the first heat exchanger 112 in S517 (S519: YES), the process proceeds to S201 (see FIG. 19). As a result, in S208, S209, and S210, operation is started in modes 6 to 8, which are modes using the first heat exchanger 112.

[0172] If the selected mode is not a mode that uses the first heat exchanger 112 (S519: NO), operation in the selected mode is initiated (S520). Next, the process returns to S501. By continuing S501 to S520, the mode is switched according to the external environment, and operation of the heat pump system 1A continues. For example, if the outside air temperature falls below the second temperature while the heat pump system 1A is operating in mode 5 (S510: NO), the mode is switched to mode 3 (S514 and S520). Also, if the amount of solar radiation falls below a reference value while the heat pump system 1A is operating in mode 3 (S507: NO), the mode is switched to mode 4 (S516 and S520).

[0173] 23, the cooling operation process executed by the CPU 701 will be described. The cooling operation process is executed, for example, when an instruction to perform cooling operation (i.e., cooling by the air conditioning heat pumps 601, 602) is input from a device (e.g., the air conditioning heat pumps 601, 602) of the load-side facility 212. The CPU 701 reads out a program for the cooling operation process from the ROM 702 and loads it into the RAM 703. The CPU 701 performs the cooling operation process in accordance with the program for the cooling operation process.

[0174] In the cooling operation process, the mode for determining the state of the first supply temperature in S604, which will be described later, is set to mode 2 (S603). In S603, the CPU 701 sets the first heat exchanger 112 and the air heat exchanger 111 to ON and sets the heat pump unit 35 and the solar heat collector 211 to OFF, thereby setting mode 2 (see FIGS. 5 and 7). As described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. This causes the first heat medium 391 and the second heat medium 392 to flow, making it possible to determine the state of the first supply temperature. Note that in S603, it is sufficient that the first heat medium 391 and the second heat medium 392 flow, and heat exchange does not necessarily occur in the heat pump unit 35 and the air heat exchanger 111.

[0175] Next, similar to S106, a first supply temperature is detected based on the output of temperature sensor 946 (S602). Next, similar to S107, a second supply temperature is detected based on the output of temperature sensor 953 (S603).

[0176] Next, it is determined whether the first supply temperature detected in S603 is equal to or lower than a third temperature (S604). The third temperature is the temperature obtained by subtracting a third predetermined temperature from the second supply temperature detected in S601. The third predetermined temperature is, for example, 5°C.

[0177] If the first supply temperature is equal to or lower than the third temperature (S604: YES), the operation start mode is set to mode 2 (S605). In S605, the CPU 701 sets the first heat exchanger 112 and the air heat exchanger 111 to ON, and sets the heat pump unit 35 and the solar heat collector 211 to OFF, thereby setting mode 2 (see FIGS. 5 and 7). Also, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven. Next, the process proceeds to S607, which will be described later.

[0178] If the first supply temperature is not lower than or equal to the third temperature (S604: NO), the operation start mode is set to mode 1 (S606). In S606, the CPU 701 sets the heat pump unit 35 and the air heat exchanger 111 to ON, and sets the first heat exchanger 112 and the solar heat collector 211 to OFF, thereby setting mode 1 (see FIGS. 5 and 6). Furthermore, as described above, the on-off valves 921 to 932 are opened and closed, and the pumps 961 and 962 are driven.

[0179] Next, in S605 and S606, it is determined whether or not five minutes have passed since operation was started in mode 1 or mode 2 (S607). If five minutes have not passed (S607: NO), the process waits.

[0180] If five minutes have passed (S607: YES), the processes of S608 to S616 are performed. In the processes of S608 to S616, if the surrounding environment changes, for example, the weather changes, after operation has started in mode 1 or mode 2, the mode is switched.

[0181] If five minutes have elapsed (S607: YES), a first supply temperature is detected (S608). Then, a second supply temperature is detected (S609). Then, similar to S604, it is determined whether the first supply temperature detected in S607 is equal to or lower than a third temperature (S610). The third temperature in S610 is the temperature obtained by subtracting a third predetermined temperature from the second supply temperature detected in S609. Note that the third predetermined temperature in S610 may be different from the third predetermined temperature in S604.

[0182] If the first supply temperature is equal to or lower than the third temperature (S610: YES), it is determined whether the state in which the first supply temperature is equal to or lower than the third temperature has continued for a predetermined time or more (S611). If this state has not continued for the predetermined time or more (S611: NO), the process returns to S608.

[0183] If the state in which the first supply temperature is equal to or lower than the third temperature continues for a predetermined time or longer (S611: YES), the selected mode is determined to be mode 2 (S612). Next, the process proceeds to S615, which will be described later.

[0184] If the first supply temperature is not equal to or lower than the third temperature (S610: NO), it is determined whether the state in which the first supply temperature is not equal to or lower than the third temperature continues for a predetermined time or more (S613). If this state does not continue for the predetermined time or more (S613: NO), the process returns to S608.

[0185] If the state in which the first supply temperature is not equal to or lower than the third temperature continues for a predetermined time or longer (S613: YES), the selected mode is determined to be Mode 1 (S614). Next, it is determined whether the selected mode set in S612 or S613 is the same as the stay mode (i.e., the mode currently in operation) (S615). If the selected mode and the stay mode are the same (S615: YES), the process returns to S608. That is, operation continues in the mode currently in operation.

[0186] If the selected mode and the stay mode are different (S615: NO), operation is started in the selected mode determined in S612 or S614 (S616). This switches the mode. Next, the process returns to S608. By continuing S608 to S616, the mode is switched depending on the external environment, and operation of the heat pump system 1A continues. For example, if the first supply temperature becomes higher than the third temperature due to a change in the external environment while the heat pump system 1A is operating in mode 2 (S610: NO), the mode is switched to mode 1 (S614 and S616). Also, if the first supply temperature becomes lower than the third temperature due to a change in the external environment while the heat pump system 1A is operating in mode 1 (S610: YES), the mode is switched to mode 2 (S612 and S616).

[0187] Next, the summer heat radiation process executed by the CPU 701 will be described with reference to Fig. 24. The summer heat radiation process is executed, for example, when operation in modes 1 to 8 is not being executed. The CPU 701 reads out a program for the summer heat radiation process from the ROM 702 and loads it in the RAM 703. The CPU 701 performs the summer heat radiation process in accordance with the program for the summer heat radiation process.

[0188] In the summer heat release process, first, it is determined whether or not to perform summer heat release (S801). If summer heat release is not to be performed (S801: NO), the process returns to S801. For example, it is determined that summer heat release is to be performed when the pressure detected by the pressure sensor 213 is equal to or greater than a first predetermined value. When the temperature of the first heat medium 391 rises in summer, the first heat medium 391 expands, and the pressure detected by the pressure sensor 213 increases. Therefore, summer heat release process is performed to lower the temperature of the first heat medium 391 and reduce the pressure applied to the flow path of the first heat medium 391. Note that, when the pump 961 is driven to cause the first heat medium 391 to flow through the flow path 981, if the pressure detected by the pressure sensor 213 is equal to or greater than a first predetermined value, it may be determined that summer heat release is to be performed. Alternatively, it may be determined that summer heat release is to be performed when an instruction to perform summer heat release is input via the operation unit 892.

[0189] If it is determined that summer heat radiation is to be performed (S801: YES), operation in summer heat radiation mode is performed (S802). The CPU 701 turns on the solar heat collector 211 and the air heat exchanger 111, and turns off the first heat exchanger 112 and the heat pump unit 35 (see FIGS. 5 and 12). As described above, the on-off valves 921 to 932 are opened and closed, and the pump 961 is driven. As a result, the first heat medium 391 heated in the solar heat collector 211 is supplied to the air heat exchanger 111, and heat is radiated from the first heat medium 391 in the air heat exchanger 111 (see arrow 669 in FIG. 12). As a result, the temperature of the first heat medium 391 is lowered.

[0190] Next, it is determined whether or not to terminate operation in the summer heat release mode (S803). If operation in the summer heat release mode is not to be terminated (S803: NO), the process of S803 is repeated. For example, if the pressure based on the pressure sensor 213 is equal to or less than a second predetermined value, it is determined that operation in the summer heat release mode is to be terminated. The second predetermined value is a value smaller than the first predetermined value described above. It may also be determined that operation in the summer heat release mode is to be terminated if an instruction to terminate the summer heat release mode is input via the operation unit 892 or if operation in modes 1 to 8 is started. If it is determined that operation in the summer heat release mode is to be terminated (S803: YES), the process returns to S801.

[0191] Next, referring to Fig. 25, the geothermal pump processing executed by the CPU 701 will be described. The geothermal pump processing is executed, for example, while the heating operation processing or the cooling operation processing is being executed. The CPU 701 reads out the geothermal pump processing program from the ROM 702 and loads it in the RAM 703. The CPU 701 performs the geothermal pump processing in accordance with the geothermal pump processing program.

[0192] In the geothermal pump processing, first, it is determined whether the power supply of the geothermal pump 744 is ON (S901). For example, when the geothermal heat exchanger 604 is not in use, the geothermal pump 744 is OFF. If the geothermal pump 744 is not ON (S901: NO), the processing of S901 is repeated.

[0193] If the geothermal pump 744 is ON (S901: YES), it is determined whether at least one of the hot water heat pump 603, the air conditioning heat pump 601, and the air conditioning heat pump 602 is operating (S902). If it is determined that all of the hot water heat pump 603, the air conditioning heat pump 601, and the air conditioning heat pump 602 are stopped (S902: NO), the process of S902 is repeated.

[0194] If it is determined that at least one of the hot water supply heat pump 603, the air conditioning heat pump 601, and the air conditioning heat pump 602 is operating (S902: YES), a provisional operation of the geothermal heat exchanger 604 is started (S903). In this embodiment, as an example, the operating frequency of the geothermal pump 744 is set to F1 (15 Hz in this embodiment, as an example), which is the minimum operating frequency shown in Fig. 17, and operation is started for one minute.

[0195] Next, the processes of S904 to S909 and S917 are executed to perform a loop flow path cooling / heating determination. The loop flow path cooling / heating determination is a determination to determine whether the second heat medium 392 flowing through the loop flow path 71 is cooled, heated, or neither cooled nor heated by the underground heat exchanger 604.

[0196] First, the data table 96 (see FIG. 13) is referenced, and the first to third modes are determined (S904). For example, if "air conditioning heat pumps 601, 602 are cooling" is "X" and "air conditioning heat pumps 601, 602 are heating" and "hot water supply heat pump 603 is ON" are "○", the first mode is determined. If "air conditioning heat pumps 601, 602 are cooling" is "○", "air conditioning heat pumps 601, 602 are heating" is "X", and "hot water supply heat pump 603 is ON" is "X", the second mode is determined. If "air conditioning heat pumps 601, 602 are cooling" is "X", "air conditioning heat pumps 601, 602 are heating" is "X", and "hot water supply heat pump 603 is ON" is "X", the second mode is determined. If "air conditioning heat pumps 601, 602 are cooling" is "◯", "air conditioning heat pumps 601, 602 are heating" is "X", and "hot water supply heat pump 603 is ON" is "◯", the third mode is determined.

[0197] Next, the data table 97 (see FIG. 14) is referenced, and it is determined whether to cool or heat the second heat medium 392 flowing through the loop flow path 71 (S905). For example, if the "first mode" is determined in the processing of S904, the "heating mode" associated with the "first mode" in the data table 97 is determined. If the "second mode" is determined in the processing of S904, the "cooling mode" associated with the "second mode" in the data table 97 is determined.

[0198] If the "third mode" is determined in the processing of S904, the CPU 701 detects a temperature T787 of the second heat medium 392 flowing through the flow path 758 (see FIG. 2) based on the output of the temperature sensor 787 (see FIG. 2). That is, the temperature T787 of the second heat medium 392 downstream of the hot water supply heat pump 603 and the air conditioning heat pumps 601, 602 is acquired. The CPU 701 also detects a temperature T734 of the second heat medium 392 in the flow path 711 based on the output of the temperature sensor 734 (see FIG. 2). That is, the temperature T734 of the second heat medium 392 upstream of the hot water supply heat pump 603 and the air conditioning heat pumps 601, 602 is acquired.

[0199] Next, the acquired temperature T787 is compared with the temperature T734. As shown in data table 97, if the temperature T787 is greater than the temperature T734, the "cooling mode" is selected. If the temperature T787 is less than the temperature T734, the "heating mode" is selected.

[0200] Next, a first validity / invalidity determination is performed (S906). In S906, as shown in a first validity / invalidity determination graph 98 (see FIG. 15), it is determined whether the underground heat exchanger 604 is valid for use in the heating mode, valid for use in the cooling mode, or invalid for use.

[0201] The CPU 701 detects a temperature T737 of the second heat medium 392 flowing through the flow path 715 based on the output of the temperature sensor 737 (see FIG. 2). That is, the temperature T737 is acquired in the second heat medium 392 upstream of the underground heat exchanger 604 in the loop flow path 71. For example, if the "heating mode" was selected in S905 and the temperature T737 is equal to or lower than the temperature T11, it is determined that using the underground heat exchanger 604 in the heating mode is valid, as shown in the first validity / invalidity determination graph 98 (see FIG. 15). If the "heating mode" was selected in S905 and the temperature T737 is higher than the temperature T11, it is determined that using the underground heat exchanger 604 in the heating mode is invalid, as shown in the first validity / invalidity determination graph 98 (see FIG. 15). Note that if the temperature T737 is equal to or higher than T12, it is determined that the underground heat exchanger 604 is valid if the "cooling mode" was selected in S905, but is determined that the underground heat exchanger 604 is invalid if the "heating mode" was selected in S905.

[0202] For example, if the "cooling mode" was selected in S905 and temperature T737 is equal to or higher than temperature T12, it is determined that using the underground heat exchanger 604 in the cooling mode is effective, as shown in the first effectiveness / ineffectiveness determination graph 98 (see FIG. 15). If the "cooling mode" was selected in S905 and temperature T737 is lower than temperature T12, it is determined that using the underground heat exchanger 604 in the cooling mode is ineffective, as shown in the first effectiveness / ineffectiveness determination graph 98 (see FIG. 15). Note that if the temperature is equal to or lower than T11, it is determined that the mode is effective if the "heating mode" was selected in S905, but it is determined that the mode is ineffective if the "cooling mode" was selected in S905.

[0203] Next, it is determined whether the first valid / invalid determination in S906 was valid (S908). If it is not valid (S907: NO), it is determined whether a predetermined time (e.g., 1 minute) has elapsed since the start of temporary operation of the underground heat exchanger 604 in S903 (S917). If the predetermined time has not elapsed (S917: NO), the process returns to S904.

[0204] If the predetermined time has elapsed (S917: YES), the process returns to S901. Note that the provisional operation of the geothermal pump 744 continues. In this case, if S903 is executed, the provisional operation of the geothermal pump 744 continues.

[0205] If the result of the first valid / invalid determination in S906 is valid (S907: YES), a second valid / invalid determination is executed (S908). In S908, as shown in a second valid / invalid determination graph 99 (see FIG. 16 ), it is determined whether use of the underground heat exchanger 604 is valid in the heating mode, valid in the cooling mode, or invalid based on the temperature change of the second heat medium 392 flowing through the underground heat exchanger 604.

[0206] In S908, the determination is made based on the difference between the temperature T746 of the second heat medium 392 detected by the temperature sensor 746 downstream of the underground heat exchanger 604 and the temperature T737 of the second heat medium 392 detected by the temperature sensor 737 upstream.

[0207] More specifically, the CPU 701 detects a temperature T746 of the second heat medium 392 flowing through the first merging flow path 742 based on the output of the temperature sensor 746 (see FIG. 2). That is, the temperature T746 of the second heat medium 392 downstream of the underground heat exchanger 604 is acquired. The CPU 701 detects a temperature T737 of the second heat medium 392 flowing through the flow path 715 based on the output of the temperature sensor 737 (see FIG. 2). That is, the temperature T737 of the second heat medium 392 upstream of the underground heat exchanger 604 is acquired.

[0208] The CPU 701 calculates T746-T737. If the "heating mode" was selected in S905 and T746-T737 are equal to or greater than temperature T22, it is determined that using the underground heat exchanger 604 in the heating mode is valid, as shown in the second validity / invalidity determination graph 99 (see FIG. 16). If the "heating mode" was selected in S905 and T746-T737 are lower than temperature T22, it is determined that using the underground heat exchanger 604 in the heating mode is invalid, as shown in the second validity / invalidity determination graph 99 (see FIG. 16). Note that if the "cooling mode" was selected in S905 and T746-T737 are equal to or less than T21, it is determined that the mode is valid, but if the "heating mode" was selected in S905, it is determined that the mode is invalid.

[0209] For example, if the "cooling mode" was selected in S905 and T746-T737 is equal to or lower than the temperature T21, it is determined that using the underground heat exchanger 604 in the cooling mode is effective, as shown in the second validity / invalidity determination graph 99 (see FIG. 16). If the "cooling mode" was selected in S905 and T746-T737 is greater than the temperature T21, it is determined that using the underground heat exchanger 604 in the cooling mode is ineffective, as shown in the second validity / invalidity determination graph 99 (see FIG. 16). Note that if the "heating mode" was selected in S905 and T746-T737 is equal to or higher than T22, it is determined that the mode is effective, but if the "cooling mode" was selected in S905, it is determined that the mode is ineffective.

[0210] Next, it is determined whether the second validity / invalidity determination in S908 was valid (S909). If it is not valid (S909: NO), the process proceeds to S917.

[0211] If it is determined to be valid (S909: YES), a first flow rate VM1 of the second heat medium 392 flowing through the flow path 841 is detected based on the output of the flow rate sensor 972 (see FIG. 1) as shown in FIG. 26 (S910). The first flow rate VM1 is the flow rate of the second heat medium 392 flowing from the first heat exchanger 112 or the heat pump unit 35 toward the loop flow path 71.

[0212] Next, based on the output of the flow sensor 774 (see FIG. 2), a second flow rate VM2 of the second heat medium 392 flowing through the flow path 753 is detected (S911). The second flow rate VM2 is the flow rate of the second heat medium 392 flowing through the air-conditioning heat pump 601.

[0213] Next, a third flow rate VM3 of the second heat medium 392 flowing through the flow path 755 is detected based on the output of the flow rate sensor 775 (see FIG. 2) (S912). The third flow rate VM3 is the flow rate of the second heat medium 392 flowing through the air-conditioning heat pump 602.

[0214] Next, a fourth flow rate VM4 of the second heat medium 392 flowing through the flow path 757 is detected based on the output of the flow rate sensor 776 (see FIG. 2) (S913). The fourth flow rate VM4 is the flow rate of the second heat medium 392 flowing through the hot water supply heat pump 603.

[0215] Next, control of the flow rate of the second heat medium 392 flowing through the geothermal pump 744 is started based on the first flow rate VM1, second flow rate VM2, third flow rate VM3, and fourth flow rate VM4 detected in the processes of S910 to S913 (S914).

[0216] In S914, the geothermal pump 744 is controlled as shown in the geothermal pump control graph 100 (see FIG. 17). |±VM1±VM2±VM3-VM4| is calculated. At this time, if at least one of the first heat exchanger 112 and the heat pump unit 35 is heating, it is set to "+VM1", and if at least one of the first heat exchanger 112 and the heat pump unit 35 is cooling, it is set to "-VM1". If the air conditioning heat pump 601 is cooling, it is set to "+VM2", and if the air conditioning heat pump 601 is heating, it is set to "-VM2". If the air conditioning heat pump 602 is cooling, it is set to "+VM3", and if the air conditioning heat pump 602 is heating, it is set to "-VM3". When the hot water supply heat pump 603 is operating, it is always heating, so the sign is always "-", i.e., "-VM4".

[0217] The CPU 701 operates the geothermal pump 744 at F1 [Hz] when the value of |±VM1±VM2±VM3-VM4| is smaller than VMA. The CPU 701 operates the geothermal pump 744 at F2 [Hz] when the value of |±VM1±VM2±VM3-VM4| is larger than VMB. The CPU 701 operates the geothermal pump 744 so that the flow rate of the second heat medium 392 becomes |±VM1±VM2±VM3-VM4| when |±VM1±VM2±VM3-VM4| is in the range of greater than or equal to VMA and less than or equal to VMB. This controls the flow rate of the second heat medium 392 flowing through the geothermal heat exchanger 604 to become |±VM1±VM2±VM3-VM4|.

[0218] Next, it is determined whether or not to terminate the control of the geothermal pump 744 that was started in S914 (S915). If the control of the geothermal pump 744 is not to be terminated (S915: NO), the process of S915 is repeated. That is, the control of the geothermal pump 744 that was started in S914 continues, and heat exchange is performed by the geothermal heat exchanger 604.

[0219] For example, when the air conditioning heat pump 601, the air conditioning heat pump 602, and the hot water supply heat pump 603 have all stopped, it is determined that the control of the geothermal pump 744 should be ended. If the control of the geothermal pump 744 is to be ended (S915: YES), processing to end the control of the geothermal pump 744 is performed (S916). This stops the geothermal pump 744. Next, the processing returns to S901 shown in FIG. 25.

[0220] The processing in this embodiment is performed as described above. In this embodiment, as in the heat release mode (see FIG. 12), the first heat medium 391 heated in the solar heat collector 211 is sent to the air heat exchanger 111, and the heat of the first heat medium 391 is released. Therefore, when releasing the heat of the first heat medium 391, there is no need to add any components other than the solar heat collector 211, the air heat exchanger 111, the first heat exchanger 112, and the heat pump unit 35, and the installation cost of the heat pump system 1A can be reduced.

[0221] In addition, a geothermal pump 744 is provided to flow the second heat medium 392 from the loop flow path 71 to the geothermal heat exchanger 604 (see FIG. 2). Therefore, a portion of the second heat medium 392 flowing through the loop flow path 71 flows to the geothermal heat exchanger 604 via the first branch flow path 741. The second heat medium 392 heated or cooled in the geothermal heat exchanger 604 then merges with the second heat medium 392 flowing through the loop flow path 71 via the first merger flow path 742. This heats or cools the second heat medium 392 flowing through the loop flow path 71. Because the second heat medium 392 flowing through the loop flow path 71 is heated or cooled, the power consumption of the heat pump unit 35 is reduced compared to when the geothermal heat exchanger 604 is not provided. This reduces the power consumption of the heat pump system 1A.

[0222] A loop flow path 71 is also provided. A second branch flow path 750 is provided branching from the loop flow path 71 and connected to the air conditioning heat pumps 601 and 602 and the hot water supply heat pump 603. A second merging flow path 759 is connected to the air conditioning heat pumps 601 and 602 and the hot water supply heat pump 603 and merges with the loop flow path 71. As a result, a portion of the second heat medium 392 flowing through the loop flow path 71 is supplied to the air conditioning heat pump 601 and the hot water supply heat pump 603, thereby performing air conditioning and hot water supply. The air conditioning heat pumps 601 and 602 and the hot water supply heat pump 603, which are multiple devices that use the temperature of the second heat medium 392, can also be connected to the loop flow path 71. The second heat medium 392 that flows through the air conditioning heat pumps 601 and 602 and the hot water supply heat pump 603 merges with the loop flow path 71. For example, when the air-conditioning heat pumps 601, 602 are used for cooling, the temperature of the second heat medium 392 increases. Meanwhile, in the hot-water supply heat pump 603, the temperature of the second heat medium 392 decreases. Therefore, the second heat medium 392 whose temperature has increased in the air-conditioning heat pumps 601, 602 and the second heat medium 392 whose temperature has decreased in the hot-water supply heat pump 603 merge in the loop flow path 71. As a result, the temperature of the second heat medium 392 whose temperature has increased in the air-conditioning heat pumps 601, 602 decreases, and the temperature of the second heat medium 392 whose temperature has decreased in the hot-water supply heat pump 603 increases. In other words, heat recovery is performed. Therefore, compared to when the loop flow path 71 is not provided, the load on the heat pump unit 35 is smaller, and power consumption can be reduced.

[0223] Furthermore, the flow rate of the second heat medium 392 flowing through the underground heat exchanger 604 is controlled so as to satisfy the flow rate |±VM1±VM2±VM3-VM4| (see S914 in FIG. 26 ). Therefore, compared to a case in which the flow rate of the second heat medium 392 flowing through the underground heat exchanger 604 is not controlled so as to satisfy |±VM1±VM2±VM3-VM4|, the flow rate of the second heat medium 392 supplied to the underground heat exchanger 604 becomes closer to the total flow rate flowing through the air-conditioning heat pumps 601, 602 and the hot water supply heat pump 603. Therefore, power consumption can be reduced compared to a case in which the flow rate of the second heat medium 392 flowing through the underground heat exchanger 604 is not controlled so as to satisfy the flow rate |±VM1±VM2±VM3-VM4|.

[0224] In this embodiment, the CPU 701 is an example of a "control unit" of the present invention. The air-conditioning heat pump 601 is an example of a "first air-conditioning heat pump" of the present invention. The air-conditioning heat pump 602 is an example of a "second air-conditioning heat pump" of the present invention. The CPU 701 that performs the processing of S910 is an example of a "first flow rate detection means" of the present invention. The CPU 701 that performs the processing of S911 is an example of a "second flow rate detection means" of the present invention. The CPU 701 that performs the processing of S912 is an example of a "third flow rate detection means" of the present invention. The CPU 701 that performs the processing of S913 is an example of a "fourth flow rate detection means" of the present invention. The CPU 701 that performs the processing of S914 is an example of a "pump control means" of the present invention.

[0225] The present invention is not limited to the above embodiment and various modifications are possible. For example, although the geothermal pump 744 is provided in the first branch flow path 741, the present invention is not limited to this. For example, the geothermal pump 744 may be provided in the first merging flow path 742. Furthermore, although the summer heat release mode is a mode in which heat is released from the first heat medium 391 in summer, it may be executed in spring, autumn, and winter.

[0226] Furthermore, in mode 3, first heat medium 391 flows as shown in Fig. 8, but this is not limited to this. On-off valve 927, which is a fixed quantity valve in Fig. 8, may be changed to a proportional valve 927A that can change the flow rate, as in heat pump system 1B according to a modified example shown in Fig. 27. When operation in mode 3 is performed by processing such as S409 and S514, CPU 701 controls proportional valve 927A to control the flow rate of first heat medium 391 flowing through flow path 823 (see arrow 670).

[0227] In this case, the flow rate of the first heat medium 391 flowing through the flow path 823 can be adjusted, thereby adjusting the flow rate of the first heat medium 391 flowing through the solar heat collector 211. Therefore, the flow rate of the first heat medium 391 flowing through the solar heat collector 211 becomes smaller than the flow rate of the first heat medium 391 flowing through the heat pump unit 35. Therefore, for example, when the flow rate of the first heat medium 391 that needs to be flowed through the solar heat collector 211 is smaller than the flow rate of the first heat medium 391 that needs to be flowed through the heat pump unit 35, the flow rate of the first heat medium 391 flowing through the solar heat collector 211 can be reduced, thereby reducing the power consumption of the heat pump system 1A.

[0228] Furthermore, for example, when the flow rate of the first heat medium 391 that needs to be flowed through the solar heat collector 211 is smaller than the flow rate of the first heat medium 391 that needs to be flowed through the heat pump unit 35, if the pump 961 flows the first heat medium 391 at a flow rate that is the same as the flow rate that needs to be flowed through the solar heat collector 211, the flow rate flowed by the pump 961 may become too small, which may cause an abnormality in the heat pump unit 35. In this modification, by flowing the first heat medium 391 through the flow path 823, it is possible to reduce the flow rate of the first heat medium 391 flowing through the solar heat collector 211 and increase the flow rate flowed by the pump 961. This reduces the possibility that the flow rate flowed by the pump 961 may become too small, which may cause an abnormality in the heat pump unit 35.

[0229] As an example, in mode 3, control is performed as follows. As a premise, the flow rate of the first heat medium 391 that needs to be flowed through the heat pump unit 35 needs to be changed according to the load of the load-side equipment 212. On the other hand, there is little benefit to changing the flow rate of the first heat medium 391 flowed through the solar thermal collector 211. For this reason, by flowing the first heat medium 391 through the flow path 823 as a bypass for flowing through the heat pump unit 35 and reducing the flow rate of the first heat medium 391 flowed through the solar thermal collector 211, the head of the first heat medium 391 can be reduced and the power consumption of the pump 961 can be reduced.

[0230] The CPU 701 flows the first heat medium 391 so that the flow rate required by the heat pump unit 35 can be supplied to the heat pump unit 35. The CPU 701 controls the proportional valve 927A to control the flow rate of the first heat medium 391 flowing through the flow path 823 so that the flow rate of the first heat medium 391 flowing through the solar thermal collector 211 is constant. When the flow rate required to flow through the heat pump unit 35 increases, the CPU 701 increases the flow rate of the first heat medium 391 flowing through the flow path 823, and when the flow rate required to flow through the heat pump unit 35 decreases, the CPU 701 decreases the flow rate of the first heat medium 391 flowing through the flow path 823. In this way, the CPU 701 keeps the flow rate of the first heat medium 391 flowing through the solar thermal collector 211 constant. For example, the flow rate of the first heat medium 391 flowing through the solar heat collector 211 is 20 L / min, and the flow rate of the first heat medium 391 flowing through the flow path 823 is 20 L / min to 100 L / min.

[0231] For example, even when the solar heat collector 211 is used in a mode other than mode 3, the proportional valve 927A may be controlled so that a constant flow rate flows to the solar heat collector 211.

[0232] In this modification, the flow path 812, the flow path 811, and the flow path 981 that connect the air heat exchanger 111 and the solar thermal collector 211 are an example of a "first flow path" in the present invention. The flow path 811 and the flow path 981 are an example of a "part of the first flow path" in the present invention. The flow path 982, the flow path 819, the flow path 818, the flow path 817, the flow path 816, and the flow path 815 that connect the solar thermal collector 211 and the heat pump unit 35 are an example of a "second flow path" in the present invention. The branching portion 907 where the flow path 822 and the flow path 823 branch off is an example of a "branching portion" in the present invention. The flow path 822 that is connected to the flow path that connects the air heat exchanger 111 and the solar thermal collector 211 (i.e., the flow path formed by the flow path 812, the flow path 811, and the flow path 981) is an example of a "third flow path" in the present invention. A flow path 823 connected to a flow path connecting the solar thermal collector 211 and the heat pump unit 35 (i.e., a flow path constituted by flow path 982, flow path 819, flow path 818, flow path 817, flow path 816, and flow path 815) is an example of a "fourth flow path" of the present invention. Flow paths 814, flow path 826, and flow path 824 connecting the heat pump unit 35 and the branching unit 907 are an example of a "fifth flow path" of the present invention. The pump 961 is an example of a "first pump" of the present invention. An on-off valve 926 provided in the flow path 822 and configured to maintain a constant flow rate of the first heat medium 391 is an example of a "quantity valve" of the present invention. [Explanation of symbols]

[0233] 1A, 1B Heat pump system 11A unit 35 Heat pump section 70 Control Panel 110 Storage section 111 Air heat exchanger 112 First heat exchanger 211 Solar collector 391 First heat medium 392 Second heat medium 393 Water 601,602 Heat pumps for air conditioning 603 Hot water heat pump 604 Geothermal heat exchanger 701 CPU 744 Geothermal Pumps 927A Proportional Valve

Claims

1. A heat pump system in which a first heat medium is used as a heat source to heat or cool a second heat medium, a solar heat collector that heats the first heat medium with heat from solar radiation; an air heat exchanger that exchanges heat between air and the first heat medium to heat or cool the first heat medium; a first heat exchanger that exchanges heat between the first heat medium and the second heat medium to heat or cool the second heat medium; a heat pump unit that performs heat exchange between the first heat medium and the second heat medium by a heat pump system to heat or cool the second heat medium; a control panel having a control unit that turns on and off the solar thermal collector, the air heat exchanger, the first heat exchanger, and the heat pump unit to heat or cool the second heat medium; a unit including the air heat exchanger, the first heat exchanger, the heat pump unit, and the control panel therein; Equipped with The control unit A heat pump system characterized by turning on the solar thermal collector and the air heat exchanger, turning off the first heat exchanger and the heat pump unit, supplying the first heat medium heated in the solar thermal collector to the air heat exchanger, and dissipating heat from the first heat medium in the air heat exchanger.

2. a loop flow path provided outside the unit and through which the second heat medium circulates; a first branch flow path branching from the loop flow path; a geothermal heat exchanger connected to the first branch flow path, exchanging heat between geothermal heat and the second heat medium to heat or cool the second heat medium; A first confluence flow path connected to the underground heat exchanger and confluenced with the loop flow path; a geothermal pump provided in the first branch flow path or the first confluence flow path, for causing the second heat medium to flow from the loop flow path to the geothermal heat exchanger; The heat pump system according to claim 1, further comprising:

3. a first air-conditioning heat pump that is provided outside the unit and performs air conditioning by a heat pump method using the temperature of the second heat medium; a second air-conditioning heat pump provided outside the unit and configured to perform air conditioning by a heat pump system using the temperature of the second heat medium; a hot water heat pump provided outside the unit and configured to supply hot water by a heat pump system using the temperature of the second heat medium; a second branch flow path that branches off from the loop flow path and connects the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot water supply heat pump in parallel; a second confluence flow path connected to the first air-conditioning heat pump, the second air-conditioning heat pump, and the hot water supply heat pump and confluenced with the loop flow path; The heat pump system according to claim 2, further comprising:

4. a first flow rate detection means for detecting a first flow rate of the second heat medium flowing from the first heat exchanger or the heat pump unit toward the loop flow path; a second flow rate detection means for detecting a second flow rate of the second heat medium flowing through the first air-conditioning heat pump; a third flow rate detection means for detecting a third flow rate of the second heat medium flowing through the second air-conditioning heat pump; a fourth flow rate detection means for detecting a fourth flow rate of the second heat medium flowing through the hot water supply heat pump; a pump control means for controlling the flow rate of the second heat medium flowed by the geothermal pump based on the first flow rate, the second flow rate, the third flow rate, and the fourth flow rate; Equipped with The first flow rate detected by the first flow rate detection means is designated as VM1, The second flow rate detected by the second flow rate detection means is VM2, The third flow rate detected by the third flow rate detection means is VM3, When the fourth flow rate detected by the fourth flow rate detection means is VM4, The pump control means |±VM1±VM2±VM3-VM4| The flow rate of the second heat medium flowing into the underground heat exchanger is controlled so as to satisfy the following condition: The sign in |±VM1±VM2±VM3-VM4| is When at least one of the first heat exchanger and the heat pump unit is heating, it is "+VM1", When at least one of the first heat exchanger and the heat pump unit is cooling, it is "-VM1", When the first air conditioning heat pump is cooling, it is "+VM2", When the first air-conditioning heat pump is for heating, it is "-VM2", When the second air-conditioning heat pump is cooling, it is "+VM3", When the second air-conditioning heat pump is for heating, it is "-VM3", When the hot water heat pump is operating, it is always "-VM4" 4. The heat pump system according to claim 3, wherein:

5. a first flow path that is a flow path connecting the air heat exchanger and the solar heat collector; a second flow path that connects the solar heat collector and the heat pump unit; a branching portion where the third flow path and the fourth flow path branch off; a fifth flow path that is a flow path connecting the heat pump unit and the branch unit; a first pump that causes the first heat medium to flow through a portion of the first flow path, the second flow path, the third flow path, the fourth flow path, and the fifth flow path; Equipped with the third flow path is connected to the first flow path, the fourth flow path is connected to the second flow path, the third flow path is provided with a metering valve that regulates the flow rate of the first heat medium to a fixed value; a proportional valve capable of changing a flow rate of the first heat medium when the fourth flow path is provided, a flow rate control means for controlling the proportional valve and controlling the flow rate of the first heat medium flowing through the fourth flow path; The heat pump system according to any one of claims 1 to 4, further comprising:

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