JP2018080871A - Heat pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump system which achieves cost reduction.SOLUTION: A heat pump system 1 includes: a passage 13; a heat pump part 2; a groundwater passage 61; and a pump part 62. The passage 13 is a passage through which a liquid 17 flows. The passage 13 causes groundwater 89 of a first well 81 and a liquid 17 to conduct heat exchange and causes groundwater 89 of a second well 82 and the liquid 17 to conduct heat exchange. The passage 13 is connected to the heat pump part 2. The groundwater passage 61 is a passage which connects the first well 81 with the second well 82 and through which the groundwater 89 flows. The pump part 62 is disposed in the groundwater passage 61. A CPU included in the heat pump part 2 controls the pump part 62 to feed the groundwater 89 from one of the first well 81 and the second well 82 to the other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat pump system capable of heating or cooling a liquid or gas.

  Conventionally, a heat pump system capable of heating or cooling a liquid or gas is known. In such a heat pump system, a heat pump system using ground heat such as groundwater has been proposed. For example, in the heat pump air conditioning system described in Patent Document 1, a well and a circulation pipe through which a heat exchange medium circulates are provided. The circulation pipe faces into the well, and a well heat exchanger is disposed at the end of the circulation pipe. The position of the well heat exchanger is below the groundwater level. The well heat exchanger is provided at the position of the heat convection layer of the well, and performs heat exchange between the heat exchange medium and the fluid in the formation using the heat convection of the heat convection layer.

JP-A-9-137972

  However, in the conventional heat pump system, when the operation of the heat pump system is continued, heat exchange between the liquid or air flowing through the flow path arranged in the well and the ground water is continued, and the temperature change of the ground water may increase. is there. In this case, the efficiency of heat exchange may decrease. For this reason, it is necessary to suppress the temperature change of groundwater. As a method for suppressing the temperature change of the groundwater, it is conceivable to pump the groundwater from the well and drain it, or to inject water from the outside into the well. However, when pumping groundwater from a well and draining it, several pumps are needed to pump it up. For this reason, there has been a problem that the cost of the pump and the electricity charge for operating the pump are increased, and the cost of the heat pump system is increased. In addition, when water is injected into the well from the outside, there is a problem that costs such as tap water are increased and the cost is increased.

  An object of the present invention is to provide a heat pump system that reduces costs.

  The heat pump system according to the present invention is a flow path through which a liquid flows, and exchanges heat between the groundwater of at least one first well and the liquid, and exchanges heat between the groundwater and the liquid of at least one second well. A liquid flow path to be connected, the liquid flow path is connected, a heat pump section that utilizes the temperature of the liquid flowing through the liquid flow path, the first well and the second well are connected, and the groundwater is fed. A groundwater flow channel that is a flow channel, a pump unit disposed in the groundwater flow channel, and the pump unit are controlled to feed the ground water from one to the other of the first well and the second well. And a water supply control means.

  In this case, groundwater is sent from one to the other of the first well and the second well. For this reason, groundwater is pumped from one of the first well and the second well, and groundwater is poured into the other. Thereby, forced convection or the like occurs in the ground water between the first well and the second well, and the temperature change of the ground water in the first well and the second well can be suppressed. For this reason, the efficiency of heat exchange of the heat pump system is improved. Moreover, the number of pump parts can be reduced compared with the case where a pump part is arrange | positioned in each of a 1st well and a 2nd well, and drains groundwater. For this reason, the cost which purchases a pump part can be reduced. In addition, costs such as electricity charges for operating the pump unit can be reduced. Moreover, compared with the case where water is injected into each of the first well and the second well from the outside, it is possible to reduce costs such as a fee for tap water. For this reason, the cost of a heat pump system can be reduced.

  In the heat pump system, the water supply control means may intermittently execute the water supply of the groundwater. In this case, the power consumption of the heat pump system 1 can be reduced as compared with the case where water is constantly supplied. For this reason, the cost of operating the heat pump system can be reduced.

  The heat pump system may include water supply switching means for switching between a case where the groundwater is supplied from the first well to the second well and a case where the groundwater is supplied from the second well to the first well. . In this case, temperature changes between the groundwater in the first well and the groundwater in the second well can be suppressed as compared with the case where water is supplied only in one direction. Therefore, the efficiency of heat exchange of the heat pump system is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system can be reduced.

  The heat pump system includes a temperature difference acquisition unit that acquires a temperature difference between the groundwater of the first well and the groundwater of the second well, and the temperature difference acquired by the temperature difference acquisition unit is a predetermined value or more. Temperature difference determining means for determining whether or not the temperature difference is determined, and the water supply control means starts the water supply of the groundwater when the temperature difference determining means determines that the temperature difference is equal to or greater than a predetermined value. May be.

  In this case, when the temperature difference between the groundwater in the first well and the groundwater in the second well becomes a predetermined value or more, the groundwater can be fed. For this reason, the temperature change of the ground water of a 1st well and the ground water of a 2nd well can be suppressed. Therefore, the efficiency of heat exchange of the heat pump system is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system can be reduced.

  The heat pump system includes a flow rate acquisition unit that acquires a flow rate of the groundwater flowing through the groundwater flow path, and a flow rate determination unit that determines whether the flow rate acquired by the flow rate acquisition unit is a predetermined flow rate or less. When the flow rate determining means determines that the flow rate is equal to or lower than a predetermined flow rate, the flow rate control means reverses the water supply in the groundwater flow path, or includes flow path control means for draining the groundwater from the groundwater flow path. Also good.

  In this case, for example, even when mud, foreign matter, etc. flows into the groundwater flow path and the groundwater becomes difficult to flow into the groundwater flow path, the water supply in the groundwater flow path is reversed or the groundwater is drained from the groundwater flow path. Thus, mud, foreign matter, etc. are discharged from the groundwater flow path. This makes it easier for groundwater to flow in the groundwater flow path and suppresses temperature changes between the first well and the second well. Therefore, the efficiency of heat exchange of the heat pump system is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system can be reduced.

  The heat pump system includes a liquid temperature acquisition unit that acquires a temperature of the liquid flowing through the liquid channel, and a flow rate of the groundwater that flows through the groundwater channel according to the temperature of the liquid acquired by the liquid temperature acquisition unit. The water supply control means may supply the groundwater at a flow rate determined by the flow rate determination means.

  In this case, the flow rate of the groundwater flowing through the groundwater channel is changed according to the temperature of the liquid flowing through the liquid channel. For this reason, for example, the temperature of the groundwater of a 1st well and the groundwater of a 2nd well can be adjusted so that the liquid which flows through a liquid flow path may approach a desired temperature. Therefore, compared with the case where the flow volume of groundwater is not changed, the heat exchange efficiency of the heat pump system is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system can be reduced.

  The heat pump system is provided in the groundwater flow path, is disposed in the first well, and includes a first opening through which the groundwater flows in or out, and the first opening is formed in the groundwater in the first well. May be arranged at the same position as the first formation to be supplied or above the first formation.

  The same position as the first formation where groundwater is supplied to the first well or the upper side of the first formation is less likely to collect mud and foreign matter than the lower side of the first formation. For this reason, compared with the case where a 1st opening part is below a 1st formation, mud, a foreign material, etc. do not flow into a groundwater flow path via a 1st opening part easily. Therefore, it is possible to reduce the possibility that the groundwater becomes difficult to flow in the groundwater flow path due to the inflow of mud and foreign matter. Therefore, the efficiency of heat exchange of the heat pump system is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system can be reduced.

  The heat pump system is provided in the groundwater flow path, is disposed in the second well, and includes a second opening through which the groundwater flows in or out, and the second opening is formed in the second well. May be arranged at the same position as the second formation to be supplied or above the second formation.

  The same position as the second formation in which groundwater is supplied to the second well or the upper side of the second formation is less likely to collect mud and foreign matter than the second formation. For this reason, compared with the case where a 2nd opening part is below a 2nd formation, mud, a foreign material, etc. do not flow into a groundwater flow path via a 2nd opening part easily. Therefore, for example, it is possible to reduce the possibility that groundwater becomes difficult to flow in the groundwater flow channel due to inflow of mud and foreign matter. Therefore, the efficiency of heat exchange of the heat pump system is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system can be reduced.

  In the heat pump system, the pump unit may be disposed on land. The pump unit arranged on land is less expensive than the submersible pump. For this reason, the cost of a heat pump system can be reduced.

1 is a diagram illustrating a configuration of a heat pump system 1. FIG. It is a figure which shows the structure of the heat pump part 2, and the electrical structure of the heat pump system 1. FIG. It is a data block diagram of the data table 95. FIG. It is a flowchart of a groundwater water supply process. FIG. 5 is a flowchart continued from FIG. 4. It is a figure which shows the structure of the heat pump system 20 which concerns on a modification. It is a figure which shows the structure of the heat pump system 201 which concerns on a modification.

  Hereinafter, a heat pump system 1 embodying the present invention will be described. First, the outline of the heat pump system 1 will be described with reference to FIG. A heat pump system 1 shown in FIG. 1 is a system that performs indoor air conditioning. In the following description, the upper side and the lower side in FIG. 1 are referred to as the upper side and the lower side of the heat pump system 1. Moreover, the lower side of the heat pump system 1 is a gravity direction, and the upper side is an antigravity direction.

  First, the environment where the heat pump system 1 is arranged will be described. In the environment where the heat pump system 1 is arranged, there are a first well 81, a second well 82, and a building 78. The building 78 is built above the ground surface 105. The first well 81 and the second well 82 are provided downward from the ground surface 105, respectively. The depth of the first well 81 is, for example, from the ground surface 105 to 60 m. The depth of the second well 82 is, for example, from the ground surface 105 to 75 m. Ground water 89 is accumulated in the first well 81 and the second well 82. In the present embodiment, as an example, it is assumed that the water surface 811 of the ground water 89 of the first well 81 and the water surface 821 of the ground water 89 of the second well 82 are at the same position in the vertical direction.

  The groundwater 89 in the first well 81 is supplied from the first permeable formation 851 (see arrow 151). The vertical position of the first water permeable formation 851 is between 50 m and 60 m from the ground surface 105. The groundwater 89 in the second well 82 is supplied from the second permeable formation 852 (see arrow 152). The vertical position of the second water permeable formation 852 is between 65 m and 75 m from the ground surface 105.

  The configuration of the heat pump system 1 will be described. The heat pump system 1 includes a fan coil unit 10, a heat pump unit 2, a channel 11, a channel 12, a channel 13, and a groundwater circulation unit 6. The heat pump system 1 also includes temperature sensors 901, 902, 903, 904, 911, 912, 913, 914, and flow meters 951, 952, 953.

  The fan coil unit 10 takes in air from the room 781 of the building 78, exchanges heat with the liquid 16, adjusts the temperature of the air, and blows air into the room 781 with a blower. Thereby, the room 781 is cooled or heated. The liquid 16 is supplied from the flow path 12 to the fan coil unit 10, flows through the fan coil unit 10, and flows out from the flow path 11.

  The heat pump unit 2 is disposed outdoors (outside the building 78). The flow path 11 and the flow path 12 are connected to the heat pump unit 2 and the fan coil unit 10, respectively. The flow path 13 is connected to the heat pump unit 2. The flow path 11 and the flow path 12 are flow paths through which the liquid 16 flows. The flow path 13 extends from the heat pump unit 2 and returns to the heat pump unit 2 via the first well 81 and the second well 82. The channel 13 is a channel through which the liquid 17 flows. The channel 13 exchanges heat between the groundwater 89 in the first well 81 and the liquid 17 and exchanges heat between the groundwater 89 in the second well 82 and the liquid 17. The liquid 16 and the liquid 17 are water, for example. Note that the liquid 16 does not flow through the flow paths 11 and 12, but a gas such as air may flow, for example.

  The flow path 13 will be described in more detail. The channel 13 includes a channel 131, a channel 132, a channel 133, and a channel 134. The flow path 131 and the flow path 132 each extend from the heat pump unit 2. The channel 131 branches into a channel 133 and a channel 134 at a branch point 141. The channel 132 branches into a channel 133 and a channel 134 at a branch point 142. The flow path 133 is directed from the branch point 141 toward the first well 81, folded back in the first well 81, and reaches the branch point 142. In the flow path 133, the part disposed in the first well 81 is a U-shaped tube heat exchanger 137. The liquid 17 flowing through the flow path 133 and the ground water 89 in the first well 81 exchange heat via a U-shaped tube heat exchanger 137.

  The flow path 134 is directed from the branch point 141 toward the second well 82, folded back in the second well 82, and reaches the branch point 142. A part of the flow path 134 that is disposed in the second well 82 is a U-shaped tube heat exchanger 138. The liquid 17 flowing through the flow path 134 and the ground water 89 in the second well 82 exchange heat via the U-shaped tube heat exchanger 138.

  The position of the lower end 135 of the flow path 133 in the first well 81 is, for example, a position 60 m from the ground surface 105. The position of the lower end 136 of the flow path 134 in the second well 82 is, for example, a position 60 m from the ground surface 105.

  The temperature sensor 901 is disposed in the flow path 11. The temperature sensor 902 is disposed in the flow path 12. The temperature sensor 903 is disposed in the flow path 131. The temperature sensor 904 is disposed in the flow path 132. The temperature sensor 905 is provided in a path from the portion disposed in the first well 81 to the branch point 142 in the flow path 133. The temperature sensor 906 is disposed in a path from the portion disposed in the second well 82 to the branch point 142 in the flow path 134.

  The flow meter 951 is disposed between the temperature sensor 902 and the fan coil unit 10 in the flow path 12. The flow meter 952 is disposed between the temperature sensor 905 and the branch point 142 in the flow path 133. The flow meter 953 is disposed between the temperature sensor 906 and the branch point 142 in the flow path 134.

  The temperature sensor 911 and the temperature sensor 912 are disposed in the ground water 89 of the first well 81, respectively. The position of the temperature sensor 911 is, for example, a position 30 m from the ground surface 105. The position of the temperature sensor 912 is, for example, a position 60 m from the ground surface 105.

  The temperature sensor 913 and the temperature sensor 914 are disposed in the ground water 89 of the second well 82, respectively. The position of the temperature sensor 913 is, for example, a position from the ground surface 105 to 30 m. The position of the temperature sensor 914 is, for example, a position 60 m from the ground surface 105.

  The groundwater circulation part 6 includes a groundwater flow path 61, a pump part 62, temperature sensors 921 and 922, and a flow meter 954. The groundwater flow path 61 is a flow path that connects the first well 81 and the second well 82 and is supplied with groundwater 89. The groundwater channel 61 extends from the first well 81 to the second well 82 via the ground surface 105. The groundwater flow path 61 is a closed pipe having no part opened to the atmosphere.

  The pump unit 62 is disposed in the groundwater flow path 61. The pump unit 62 is disposed on land (in the present embodiment, above the ground surface 105). The CPU 241 (see FIG. 2, which will be described later) controls the pump unit 62 to send ground water 89 from one of the first well 81 and the second well 82 to the other. In the present embodiment, the CPU 241 controls the pump unit 62 to supply groundwater 89 from the first well 81 to the second well 82 (see arrow 181), and from the second well 82 to the first well 81. Switching between water supply (see arrow 182) (see S8 in FIG. 4). Moreover, the structure in case the pump part 62 switches the direction of water supply is not limited. For example, the pump unit 62 may be configured to be able to switch the direction of water supply. Further, the pump unit 62 can supply water in only one direction, and a flow path and an electromagnetic valve for switching the water supply direction may be provided in the groundwater flow path 61.

  A first opening 613 is provided at one end of the groundwater channel 61. The first opening 613 is disposed in the first well 81. The ground water 89 flows into or out of the ground water channel 61 through the first opening 613. The first opening 613 is disposed above the first water permeable formation 851 where the groundwater 89 is supplied to the first well 81.

  A second opening 614 is provided at the other end of the groundwater channel 61. The second opening 614 is disposed in the second well 82. The groundwater 89 flows into or out of the groundwater channel 61 through the second opening 614. The second opening 614 is disposed above the second water permeable formation 852 in which the groundwater 89 is supplied to the second well 82.

  In the following description, a portion of the groundwater channel 61 that is closer to the first well 81 than the pump unit 62 may be referred to as a groundwater channel 611. Further, in the groundwater flow channel 61, the portion on the second well 82 side from the pump unit 62 may be referred to as a groundwater flow channel 612.

  The temperature sensor 921 is provided at a site disposed on land in the groundwater flow path 611. The temperature sensor 922 is provided at a site disposed on land in the groundwater flow path 612. The flow meter 954 is provided between the pump unit 62 and the temperature sensor 922 in the groundwater flow path 612.

  The heat pump unit 2 will be described with reference to FIG. The heat pump unit 2 includes a heat exchange unit 21 and a control unit 24. The control unit 24 includes a CPU 241, a ROM 242, and a RAM 243. The CPU 241 controls the heat pump system 1. The ROM 242 stores various program data such as a heat exchange control program and a groundwater water supply treatment program which will be described later. The ROM 242 stores various data such as a data table 95 (see FIG. 3) described later. The RAM 243 stores various temporary data.

  The CPU 241 is electrically connected to the heat exchange unit 21, the ROM 242, and the RAM 243. The CPU 241 controls the heat exchange unit 21. The fan coil unit 10 is electrically connected to the CPU 241. The CPU 241 controls the fan coil unit 10 and performs air conditioning of the room 781. The fan coil unit 10 includes an operation unit 101. The CPU 241 acquires an instruction from the user input via the operation unit 101. A pump unit 62 is electrically connected to the CPU 241. The CPU 241 controls the pump unit 62.

  Temperature sensors 901 to 906, 911 to 914, 921 and 922 are electrically connected to the CPU 241. The CPU 241 detects the temperature of the liquid 16 flowing through the flow paths 11 and 12 based on the outputs of the temperature sensors 901 and 902. The CPU 241 detects the temperature of the liquid 17 flowing through the flow paths 131, 132, 133, and 134 based on the outputs of the temperature sensors 903 to 906.

  The CPU 241 detects the temperature of the ground water 89 in the first well 81 based on the outputs of the temperature sensors 911 and 912. The CPU 241 detects the temperature of the groundwater 89 in the second well 82 based on the outputs of the temperature sensors 913 and 914. The CPU 241 detects the temperature of the groundwater 89 flowing through the groundwater channel 61 based on the outputs of the temperature sensors 921 and 922.

  Flow meters 951 to 954 are electrically connected to the CPU 241. The CPU 241 detects the flow rate of the liquid 16 flowing through the flow path 12 based on the output of the flow meter 951. The CPU 241 detects the flow rate of the liquid 17 flowing through the flow path 133 based on the output of the flow meter 952. The CPU 241 detects the flow rate of the liquid 17 flowing through the flow path 134 based on the output of the flow meter 953. The CPU 241 detects the flow rate of the groundwater 89 flowing through the groundwater flow channel 61 based on the output of the flow meter 954. Further, the CPU 241 can measure time.

  The data table 95 will be described with reference to FIG. As shown in FIG. 3, in the data table 95, the temperature T and the flow rate are associated with each other. The temperature T is the temperature of the liquid 17 acquired based on the outputs of the temperature sensor 903 and the temperature sensor 904. In the present embodiment, as an example, the temperature T is an average value of the temperature based on the output of the temperature sensor 903 and the temperature based on the output of the temperature sensor 904. Further, the flow rate is the flow rate of the groundwater 89 flowing through the groundwater flow path 61.

  In the data table 95, the temperature T “A1 ≦ T <A2” and the flow rate “F1” are associated with each other, and the temperature T “A2 ≦ T <A3” and the flow rate “F2” are associated with each other. Further, the temperature T “A3 ≦ T <A4” and the flow rate “F3” are associated with each other. A1 to A4 are preset temperatures. For example, A1 is 5 degrees, A2 is 10 degrees, A3 is 15 degrees, and A4 is 20 degrees. Further, F1 is 15 L / min, F2 is 10 L / min, and F3 is 5 L / min. The temperature T and the flow rate in the data table 95 are adjusted, for example, by adjusting the temperatures of the ground water 89 in the first well 81 and the ground water 89 in the second well 82 so that the liquid 17 flowing through the flow path 13 approaches a desired temperature. The relationship that can be done is preset.

  With reference to FIG.1 and FIG.2, the detail of the heat exchange part 21 and the aspect of the heat exchange of this embodiment are demonstrated. The heat exchange unit 21 is configured to cool or heat the liquid 16 flowing from the flow path 11 by using the temperature of the liquid 17 flowing from the flow path 132. In addition, the liquid 17 that has flowed into the heat exchange unit 21 flows out of the flow path 131 and travels toward the first well 81 and the second well 82. The liquid 16 that has flowed into the heat exchange unit 21 flows out of the flow path 12 and travels toward the fan coil unit 10.

  As shown in FIG. 2, the heat exchange unit 21 is provided with a refrigerant pipe 211, a compressor 212, a refrigerant-water heat exchanger 215, an expansion valve 214, and a refrigerant-water heat exchanger 213. The refrigerant pipe 211 is compressed so as to form a refrigerant passage in a refrigerant circuit arranged in the order of “compressor 212 → refrigerant-water heat exchanger 215 → expansion valve 214 → refrigerant-water heat exchanger 213 → compressor 212”. Machine 212, refrigerant-water heat exchanger 215, expansion valve 214, and refrigerant-water heat exchanger 213.

  The expansion valve 214 is configured to expand the refrigerant. As the refrigerant expands, the temperature of the refrigerant decreases. The compressor 212 is configured to compress the refrigerant. As the refrigerant is compressed, the temperature of the refrigerant rises.

  The heat exchange unit 21 and the fan coil unit 10 operate so as to perform cooling or heating of the room 781 by heat exchange control of the CPU 241. When heating is performed, the liquid 16 is heated by the refrigerant-water heat exchanger 213. More specifically, the refrigerant is expanded by the expansion valve 214. As a result, the temperature of the refrigerant decreases. Next, heat is pumped up from the liquid 17 by the refrigerant-water heat exchanger 215. At this time, the temperature of the liquid 17 decreases and the temperature of the refrigerant increases. Next, the refrigerant is compressed by the compressor 212. As a result, the temperature of the refrigerant rises. Next, in the refrigerant-water heat exchanger 213, the liquid 16 is heated by heat exchange between the liquid 16 and the refrigerant. The fan coil unit 10 heats the air by heat exchange with the heated liquid 16 to heat the room 781. The refrigerant that has passed through the refrigerant-water heat exchanger 213 is supplied to the expansion valve 214.

  When cooling is performed, the liquid 16 is cooled by the refrigerant-water heat exchanger 213. More specifically, the refrigerant is compressed by the compressor 212. As a result, the temperature of the refrigerant rises. Next, heat exchange between the liquid 17 and the refrigerant is performed by the refrigerant-water heat exchanger 215. At this time, the temperature of the liquid 17 rises and the temperature of the refrigerant falls. Next, the refrigerant is expanded by the expansion valve 214. As a result, the temperature of the refrigerant decreases. Next, in the refrigerant-water heat exchanger 213, the liquid 16 is cooled by heat exchange between the liquid 16 and the refrigerant. The fan coil unit 10 cools the room 781 by cooling the air by heat exchange with the cooled liquid 16. The refrigerant that has passed through the refrigerant-water heat exchanger 213 is supplied to the compressor 212.

  In this manner, the room 781 is heated or cooled. The liquid 17 that has flowed out of the heat exchange unit 21 passes through the flow path 13 toward the first well 81 and the second well 82. The liquid 17 flowing through the flow path 13 is cooled or heated by heat exchange with the ground water 89 of each of the first well 81 and the second well 82, and is supplied to the heat exchange unit 21 via the flow path 132. The temperature of the ground water 89 is more stable than the temperature of the outside air. For this reason, if the heat exchange between the ground water 89 and the liquid 17 is performed, the temperature of the liquid 17 can be stabilized as compared with the case where the heat exchange between the outside air and the liquid 17 is performed. Exchange efficiency is improved.

  Processing executed by the CPU 241 will be described. When the operation unit 101 of the fan coil unit 10 is operated by the user of the fan coil unit 10 and an instruction to start cooling or heating of the room 781 is input, the CPU 241 reads the heat exchanger control program from the ROM 242 and The program of the groundwater water transfer process (see FIGS. 4 and 5) is read out. The CPU 241 develops the read program in the RAM 243 and executes various processes.

  The CPU 241 performs the above-described heat exchange control according to the heat exchange unit control program, controls the heat exchange unit 21 and the fan coil unit 10, and cools or heats the room 781. At this time, the liquid 16 circulates through the refrigerant-water heat exchanger 213, the flow path 12, the fan coil unit 10, and the flow path 11 of the heat pump unit 2. The liquid 17 circulates through the refrigerant-water heat exchanger 215 and the flow path 13 of the heat pump unit 2.

  Moreover, CPU241 performs a groundwater water supply process (refer FIG.4 and FIG.5) with a heat exchange part control program. As described above, the liquid 17 flowing through the flow path 13 is cooled or heated by heat exchange with the ground water 89 of each of the first well 81 and the second well 82, and the heat exchange unit 21 via the flow path 132. To be supplied. Since heat exchange is performed in the first well 81 and the second well 82, there may be a large variation between the temperature of the ground water 89 in the first well 81 and the temperature of the ground water 89 in the second well 82. In this case, the efficiency of heat exchange may decrease, and the cost for operating the heat pump system 1 may increase. Therefore, in the present embodiment, groundwater water supply treatment is performed, and the groundwater 89 in the first well 81 and the groundwater 89 in the second well 82 are pumped and poured. This suppresses changes in the temperature of the ground water 89 in the first well 81 and the temperature of the ground water 89 in the second well 82.

  With reference to FIG.4 and FIG.5, the groundwater water supply process performed in CPU241 is demonstrated. As shown in FIG. 4, in the groundwater water transfer process, first, a variable N is set to 0 (S1). The variable N is stored in the RAM 243. The variable N is a variable for counting the number of times the water is supplied in the same direction when the groundwater 89 is supplied in S13 described later (see FIG. 5).

  Next, time measurement is started (S2). Next, it is determined whether or not the first predetermined time has elapsed from the time when the measurement was started in S2 (S3). The first predetermined time is an interval time during which the water supply of the groundwater 89 is stopped. The first predetermined time is, for example, 60 minutes. When the first predetermined time has not elapsed (S3: NO), the temperature difference between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 is acquired (S4).

  As an example, the temperature difference is acquired as follows. CPU241 acquires the temperature of the groundwater 89 of the 1st well 81 based on the output of the temperature sensors 911,912 (refer FIG. 1). Thereby, in the first well 81, the temperature of the groundwater 89 having a depth of 60 m and the temperature of the groundwater 89 having a depth of 60 m are acquired from the ground surface 105. Moreover, CPU241 acquires the temperature of the groundwater 89 of the 2nd well 82 based on the output of the temperature sensor 913,914 (refer FIG. 1). Thereby, in the first well 81, the temperature of the groundwater 89 having a depth of 60 m and the temperature of the groundwater 89 having a depth of 60 m are acquired from the ground surface 105.

  The CPU 241 calculates the average value of the temperature of the ground water 89 at a depth of 30 m from the surface 105 in the first well 81 and the temperature of the ground water 89 at a depth of 60 m, and calculates the temperature of the ground water 89 of the first well 81. Get the average value. The CPU 241 calculates an average value of the temperature of the ground water 89 at a depth of 30 m from the ground surface 105 and the temperature of the ground water 89 at a depth of 60 m in the second well 82, and calculates the temperature of the ground water 89 of the second well 82. Get the average value. The CPU 241 calculates the difference between the average value of the temperature of the ground water 89 in the first well 81 and the average value of the temperature of the ground water 89 in the second well 82, whereby the ground water in the first well 81 and the second well 82 is calculated. 89 temperature difference is acquired.

  Next, it is determined whether or not the temperature difference acquired in S4 is a predetermined value or more (S5). The predetermined value is, for example, 3 degrees.

  For example, when the heat exchange by the heat exchange unit 21 is started, the temperature of the ground water 89 in the first well 81 and the temperature of the ground water 89 in the second well 82 are the same. When heat exchange is performed by the heat exchange unit 21, the liquid 17 flows through the flow path 13. At this time, heat exchange between the ground water 89 in the first well 81 and the liquid 17 flowing in the flow path 133 is performed. Further, heat exchange is performed between the ground water 89 in the second well 82 and the liquid 17 flowing through the flow path 134. When the heat exchange is continued, the temperature of the ground water 89 in the first well 81 approaches the temperature of the liquid 17 flowing in the flow path 133. Further, the temperature of the ground water 89 in the second well 82 approaches the temperature of the liquid 17 flowing in the flow path 134. This causes a temperature difference between the temperature of the ground water 89 in the first well 81 and the temperature of the ground water 89 in the second well 82. When this temperature difference increases, the temperature difference between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 becomes a predetermined value or more.

  If the temperature difference is equal to or greater than the predetermined value (S5: YES), the process of S7 described later is executed. If the temperature difference is not greater than or equal to the predetermined value (S5: NO), the process returns to S2.

  In S3, when the first predetermined time has elapsed (S3: YES), time measurement is stopped (S6). Next, it is determined whether or not to switch the water supply direction (S7). The switching of the water supply direction includes the case where water is supplied from the first well 81 to the second well 82 to the ground water 89 (see arrow 181 in FIG. 1), and the case where water is supplied from the second well 82 to the first well 81 ( Switching (see arrow 182 in FIG. 1). In this embodiment, as an example, after the water supply started in S13 (see FIG. 5) is executed twice in the same direction, the water supply direction is switched. For this reason, when the ground water 89 is fed, when the variable N for counting the number of times the water is fed in the same direction is 2 or more, it is determined to switch the water feeding direction (S7: YES).

  For example, when the variable N = 0, the CPU 241 determines that the water supply direction is not switched (S7: NO), and the temperature of the liquid 17 flowing in the flow path 13 is based on the outputs of the temperature sensors 903 and 904. Obtained (S10). In the present embodiment, as an example, an average value of the temperature of the liquid 17 based on the output of the temperature sensor 903 and the temperature of the liquid 17 based on the output of the temperature sensor 904 is acquired.

  Next, the flow rate of the groundwater 89 flowing through the groundwater flow path 61 is determined according to the temperature of the liquid 17 acquired in S10 (S11). As will be described later, the CPU 241 supplies the groundwater 89 at the flow rate determined in S11 (see S13 in FIG. 5). In S11, the CPU 241 determines the flow rate according to the temperature acquired in S10 with reference to the data table 95 (see FIG. 3). For example, when the temperature T acquired in S10 is A1 ≦ T <A2, the CPU 241 determines the flow rate to be “F1”. When the temperature T is A2 ≦ T <A3, the CPU 241 determines the flow rate to be “F2”. When the temperature T is A3 ≦ T <A4, the CPU 241 determines the flow rate to be “F3”.

  Next, as shown in FIG. 5, the variable N is incremented (S12). Next, water supply of the ground water 89 is started (S13). The CPU 241 controls the pump unit 62 to send ground water 89 from one to the other of the first well 81 and the second well 82 (S13). At this time, the CPU 241 starts water supply at the flow rate determined in S11. In addition, CPU241 controls the pump part 62 so that the flow volume of the groundwater 89 acquired based on the output of the flowmeter 954 (refer FIG. 1) has the same value as the flow volume determined in S11.

  Moreover, CPU241 starts water supply in the direction (refer arrow 181 or arrow 182 of FIG. 1) set in S8 mentioned later. In addition, when S13 is first performed after a groundwater water supply process is started, suppose that the groundwater 89 is sent from the 1st well 81 to the 2nd well 82 (arrow 181 of FIG. 1).

  Next, time measurement is started (S14). Next, the flow rate of the groundwater channel 61 is acquired based on the output of the flow meter 954 (S15). Next, it is determined whether or not the flow rate acquired in S15 is equal to or less than a predetermined flow rate (S16). By executing S16, the CPU 241 detects that mud, foreign matter, and the like are clogged in the groundwater flow path 61, and that the groundwater 89 has become difficult to flow or clogged. The predetermined flow rate is set to a flow rate at which it is possible to detect that the groundwater 89 is difficult to flow due to mud, foreign matter, or the like, or that the groundwater channel 61 is clogged. The predetermined flow rate is, for example, 5 L / min. In the present embodiment, as an example, it is assumed that a value smaller than the flow rate that can be determined in S11 is set.

  When it is determined that the flow rate acquired in S15 is not less than or equal to the predetermined flow rate (S16: NO), it is determined whether or not the second predetermined time has elapsed from the time when the measurement was started in S14 (S18). The second predetermined time is a time for continuing the water supply of the groundwater 89 started in S13. The second predetermined time is, for example, 60 minutes. If the second predetermined time has not elapsed (S18: NO), the process returns to S16.

  When the second predetermined time has elapsed (S18: YES), the pump unit 62 is controlled and the water supply of the groundwater 89 is stopped (S19). Next, the measurement of the time started in S14 is stopped (S20). Next, the process returns to S2 (see FIG. 4).

  When the variable N = 1, the groundwater 89 is fed in the same direction as when N = 0 (S7: NO and S13). When the variable N = 2 or more, it is determined that the water supply direction is switched (S7: YES), the pump unit 62 is controlled, and the setting of switching the water supply direction is performed. Thereby, for example, the water supply direction is set to be switched from the arrow 181 (see FIG. 1) to the arrow 182 (see FIG. 2). Thereby, when water supply is executed in S <b> 13, groundwater 89 is supplied from the second well 82 toward the first well 81. Next, the variable N is set to 0 (S9), and the process of S10 is executed. When S8 is executed next time, the water supply direction is switched from the arrow 181 to the direction indicated by the arrow 182.

  As shown in FIG. 5, when it is determined that the flow rate acquired in S <b> 15 is equal to or lower than the predetermined flow rate (S <b> 16: YES), the CPU 241 eliminates the state in which the groundwater 89 is difficult to flow in the groundwater flow channel 61. The operation is executed (S17). In the present embodiment, the CPU 241 causes the water supply of the groundwater 89 in the groundwater flow path 61 to flow backward. That is, for example, when the groundwater 89 is being fed in the direction of the arrow 182, switching is performed so that the groundwater 89 is fed in the direction of the arrow 181. In addition, when the groundwater 89 is being fed in the direction of the arrow 181, switching is performed so that the groundwater 89 is fed in the direction of the arrow 182. Note that a flow path for draining the ground water 89 from the ground water flow path 61 to the outside may be provided, and in S17, the ground water 89 may be drained to the outside from the flow path. By executing S <b> 17, mud, foreign matter, and the like that have flowed into the groundwater flow path 61 are removed from the groundwater flow path 61.

  The switching of the water supply direction of the groundwater 89 or the drainage of the groundwater 89 performed in S17 may be continued until it is determined in S18 that the second predetermined time has elapsed. In addition, for example, when a preset time such as 20 seconds elapses, the water supply direction may be returned to the original or drainage may be stopped.

  As described above, the processing in this embodiment is executed. In the heat pump system 1 of this embodiment, the groundwater flow path 61 and the pump part 62 are provided. The groundwater flow path 61 is a flow path that connects the first well 81 and the second well 82 and is supplied with groundwater 89. The pump unit 62 is disposed in the groundwater flow path 61. The CPU 241 controls the pump unit 62 to send groundwater 89 from one of the first well 81 and the second well 82 to the other. For this reason, the ground water 89 is pumped from one of the first well 81 and the second well 82, and the ground water 89 is poured into the other. As a result, forced convection or the like occurs in the ground water 89 between the first well 81 and the second well 82. For this reason, compared with the case where the ground water 89 is not sent by the pump part 62, the temperature change of the ground water 89 of the 1st well 81 and the 2nd well 82 can be suppressed. Therefore, heat exchange between the liquid 17 flowing through the flow path 13 and the ground water 89 of the first well 81 and the second well 82 is more efficient than when the temperature change is not suppressed. For this reason, the efficiency of heat exchange in the heat pump unit 2 is also improved. Therefore, the efficiency of heat exchange of the entire heat pump system 1 is improved.

  Further, the number of pump parts 62 can be reduced as compared with the case where the pump parts 62 are disposed in each of the first well 81 and the second well 82 and the ground water 89 is drained. For this reason, the cost which purchases the pump part 62 can be reduced. In addition, costs such as an electricity bill for operating the pump unit 62 can be reduced. Moreover, compared with the case where water is injected into each of the first well 81 and the second well 82 from the outside, costs such as a fee for tap water can be reduced. For this reason, the cost of the heat pump system 1 can be reduced. Further, it is not necessary to secure a water source for injecting water from the outside into each of the first well 81 and the second well 82.

  Moreover, the groundwater flow path 61 of this embodiment is a closed type piping without the part open | released by air | atmosphere. In this case, the groundwater from one well is equal to the difference in vertical position between the water surface 811 of the ground water 89 of the first well 81 (see FIG. 1) and the water surface 821 of the ground water 89 of the second well 82 (see FIG. 1). The groundwater 89 can be moved to the other side by the power of the pump 62 that sucks up the 89. Therefore, the power consumption of the pump part 62 can be reduced compared with the case where the groundwater flow path 61 is not closed piping. Therefore, the cost for operating the heat pump system 1 can be reduced.

  Moreover, the pump part 62 is controlled and the water supply of the ground water 89 is intermittently performed (S13). In the present embodiment, water supply is executed at intervals of the first predetermined time (S3: YES, S13). In addition, when the temperature difference between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 is equal to or greater than a predetermined value (S5: YES), water is supplied (S13). Since the water supply of the ground water 89 is intermittently performed, the power consumption of the heat pump system 1 can be reduced as compared with the case where the water supply is always performed. For this reason, the cost of operating the heat pump system 1 can be reduced.

  Also, switching between the case where the ground water 89 is sent from the first well 81 to the second well 82 (see arrow 181) and the case where the ground water 89 is sent from the second well 82 to the first well 81 (see arrow 182). (See S8). In this case, a change in temperature between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 can be suppressed as compared with the case where the ground water 89 is fed only in one direction. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  Further, for example, when mud, foreign matter or the like is mixed in the groundwater flow path 61, the groundwater 89 becomes difficult to flow in the groundwater flow path 61 or the groundwater flow path 61 is clogged. The flow rate of 89 is reduced. Thereby, the heat exchange efficiency of the heat pump system 1 may be reduced. In the present embodiment, when ground water 89 is fed from the first well 81 to the second well 82 (see arrow 181), and when ground water 89 is fed from the second well 82 to the first well 81 (see arrow 182). Therefore, there is a higher possibility that mud, foreign matter, and the like that have flowed into the groundwater channel 61 can be discharged as compared with the case where the groundwater 89 is fed only in one direction. For this reason, it is possible to reduce the possibility that the groundwater 89 becomes difficult to flow in the groundwater flow path 61 or the clogging occurs in the groundwater flow path 61 due to mud and foreign matter. For this reason, it becomes easy for the groundwater 89 to flow in the groundwater flow path 61, and the temperature change of the 1st well 81 and the 2nd well 82 is suppressed. For this reason, the efficiency of heat exchange of the heat pump system 1 is improved.

  Moreover, the flow volume of the ground water 89 which flows through the ground water flow path 61 is acquired (S15). Then, when the flow rate acquired in S15 is equal to or less than the predetermined flow rate (S16: YES), the CPU 241 causes the water supply in the groundwater channel 61 to flow backward or drains the groundwater 89 from the groundwater channel 61 (S17). As a result, mud, foreign matter, and the like flowing into the groundwater channel 61 from the first well 81 or the second well 82 are discharged from the groundwater channel 61. For this reason, it becomes easy for the groundwater 89 to flow through the groundwater channel 61. For example, when the groundwater flow path 61 is clogged, clogging is eliminated by backflow. Since the ground water 89 easily flows in the ground water flow path 61, the temperature change of the first well 81 and the second well 82 is suppressed. For this reason, the efficiency of heat exchange of the heat pump system 1 is improved.

  Further, the temperature difference between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 is acquired (S4). And when the temperature difference acquired in S4 is more than a predetermined value (S5: YES), water supply of the groundwater 89 is started (S13). When the temperature difference between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 exceeds a predetermined value, the ground water 89 can be fed, so the ground water 89 and the second water in the first well 81 A temperature change with the ground water 89 of the well 82 can be suppressed. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  Further, the temperature of the liquid 17 flowing through the flow path 13 is acquired (S10), and the flow rate of the ground water 89 flowing through the ground water flow path 61 is determined according to the acquired temperature (S11). Then, the groundwater 89 is fed at the flow rate determined in S11 (S13). In this case, the flow rate of the groundwater 89 flowing through the groundwater flow path 61 is changed according to the temperature of the liquid 17 flowing through the flow path 13. For this reason, for example, the temperature of the ground water 89 of the first well 81 and the ground water 89 of the second well 82 can be adjusted so that the liquid 17 flowing through the flow path 13 approaches a desired temperature. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved as compared with the case where the flow rate of the groundwater 89 is not changed. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  The first opening 613 is disposed above the first water permeable formation 851. The upper side of the first permeable formation 851 where the groundwater 89 is supplied to the first well 81 is less likely to collect mud and foreign matter than the lower side of the first permeable formation 851. For this reason, compared with the case where the 1st opening part 613 is below the 1st water-permeable formation 851, mud, a foreign material, etc. do not flow into the groundwater flow path 61 via the 1st opening part 613 easily. Therefore, for example, the possibility that the groundwater 89 becomes difficult to flow in the groundwater flow path 61 due to the inflow of mud, foreign matter, and the like can be reduced. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  The second opening 614 is disposed above the second water permeable formation 852. The upper side of the second permeable formation 852 to which the ground water 89 is supplied to the second well 82 is less likely to collect mud and foreign matter than the lower side of the second permeable formation 852. For this reason, compared with the case where the 2nd opening part 614 is below the 2nd water-permeable formation 852, a mud, a foreign material, etc. do not flow into the groundwater flow path 61 via the 2nd opening part 614 easily. Therefore, for example, the possibility that the groundwater 89 becomes difficult to flow in the groundwater flow path 61 due to the inflow of mud, foreign matter, and the like can be reduced. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  The pump unit 62 is disposed on land. The pump unit 62 disposed on land is less expensive than a submersible pump. For this reason, the cost of the heat pump system 1 can be reduced compared with the case where a submersible pump is used.

  In addition, since the pump unit 62 is on land, maintenance of the pump unit 62 is facilitated as compared with the case where the pump unit 62 is disposed in the groundwater 89.

  In the above embodiment, the flow path 13 is an example of the “liquid flow path” of the present invention. The CPU 241 that performs the process of S13 is an example of the “water supply control means” in the present invention. The CPU 241 that performs the process of S8 is an example of the “water supply switching means” in the present invention. The CPU 241 that performs the process of S4 is an example of the “temperature difference acquisition unit” in the present invention. The CPU 241 that performs the process of S5 is an example of the “temperature difference determination unit” in the present invention. The CPU 241 that performs the process of S15 is an example of the “flow rate acquisition unit” in the present invention. The CPU 241 that performs the process of S16 is an example of the “flow rate judging means” in the present invention. The CPU 241 that performs the process of S17 is an example of the “flow path control unit” in the present invention. The CPU 241 that performs the process of S10 is an example of the “liquid temperature acquisition unit” in the present invention. The CPU 241 that performs the process of S11 is an example of the “flow rate determining unit” in the present invention. The first water permeable formation 851 is an example of the “first formation” in the present invention. The second water permeable formation 852 is an example of the “second formation” in the present invention.

  In addition, this embodiment is not limited to the said embodiment, A various change is possible. For example, in this embodiment, when the first predetermined time has elapsed (S3: YES), or when the temperature difference between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 is equal to or greater than a predetermined value. On the other hand (S5: YES), the water supply was performed (S13), so that the groundwater 89 was supplied intermittently. However, the water supply of the groundwater 89 should just be intermittently performed and the method is not limited. For example, the groundwater 89 may be intermittently supplied so that the water supply is stopped after the groundwater 89 is supplied and the groundwater 89 is supplied again regardless of the time.

  Moreover, although the case where the groundwater 89 is sent from the 1st well 81 to the 2nd well 82 and the case where the groundwater 89 is sent from the 2nd well 82 to the 1st well 81 were switched (S8 and S13). However, the present invention is not limited to this. For example, the CPU 241 may supply the groundwater 89 only in one direction.

  Moreover, although the water supply direction of the groundwater 89 was switched after the water supply started by S13 was performed twice in the same direction (S7: YES and S8), it is not limited to this. For example, when water supply is started in S13, the water supply direction of the groundwater 89 may be switched without fail.

  When the temperature difference between the ground water 89 in the first well 81 and the ground water 89 in the second well 82 is equal to or greater than a predetermined value (S5: YES), the water supply of the ground water 89 may not be performed. In this case, the processing of S4 and S5 may not be executed. In this case, when the first predetermined time has elapsed (S3: NO), the process may return to S3 and the process of S3 may be continued. Further, when the first predetermined time has elapsed (S3: NO), the water supply of the ground water 89 may not be performed. In addition, the groundwater 89 may not be intermittently supplied, but the groundwater 89 may be always supplied.

  Moreover, although the 1st opening part 613 was arrange | positioned above the 1st water-permeable ground layer 851, it is not limited to this. For example, the first opening 613 may be at the same position as the first water permeable formation 851. In the same position as the first permeable formation 851 where the groundwater 89 is supplied to the first well 81, mud, foreign matter, and the like are less likely to accumulate than the lower side of the first permeable formation 851. For this reason, compared with the case where the 1st opening part 613 is below the 1st water-permeable formation 851, mud, a foreign material, etc. do not flow into the groundwater flow path 61 via the 1st opening part 613 easily. Therefore, for example, the possibility that the groundwater 89 becomes difficult to flow in the groundwater flow path 61 due to the inflow of mud, foreign matter, and the like can be reduced. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  The position of the first opening 613 is preferably above the first water permeable formation 851. On the upper side of the first water permeable formation 851, mud, foreign matter, and the like are less likely to accumulate than at the same position as the first water permeable formation 851. For this reason, compared with the case where the 1st opening part 613 exists in the same position as the 1st water-permeable formation 851, mud, a foreign material, etc. do not flow into the groundwater flow path 61 via the 1st opening part 613 easily. Therefore, for example, the possibility that the groundwater 89 becomes difficult to flow in the groundwater flow path 61 due to the inflow of mud, foreign matter, and the like can be reduced. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  Moreover, although the 2nd opening part 614 was arrange | positioned above the 2nd water-permeable formation 852, it is not limited to this. For example, the second opening 614 may be in the same position as the second water permeable formation 852. The same position as the second permeable formation 852 where the groundwater 89 is supplied to the second well 82 is less likely to collect mud and foreign matter than the second permeable formation 852 below the second permeable formation 852. For this reason, compared with the case where the 2nd opening part 614 is below the 2nd water-permeable formation 852, a mud, a foreign material, etc. do not flow into the groundwater flow path 61 via the 2nd opening part 614 easily. Therefore, for example, the possibility that the groundwater 89 becomes difficult to flow in the groundwater flow path 61 due to the inflow of mud, foreign matter, and the like can be reduced. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  Note that the position of the second opening 614 is preferably above the second water permeable formation 852. On the upper side of the second water permeable formation 852, mud, foreign matter, and the like are less likely to accumulate than at the same position as the second water permeable formation 852. For this reason, compared with the case where the 2nd opening part 614 exists in the same position as the 2nd water-permeable formation 852, a mud, a foreign material, etc. do not flow into the groundwater flow path 61 via the 2nd opening part 614 easily. Therefore, for example, the possibility that the groundwater 89 becomes difficult to flow in the groundwater flow path 61 due to the inflow of mud, foreign matter, and the like can be reduced. Therefore, the efficiency of heat exchange of the heat pump system 1 is improved. Moreover, since the efficiency of heat exchange is improved, the cost of operating the heat pump system 1 can be reduced.

  The first opening 613 may be disposed below the first water permeable formation 851. The second opening 614 may be disposed below the second water permeable formation 852. Moreover, although the 1st water-permeable formation 851 and the 2nd water-permeable formation 852 were different formations, the same formation may be sufficient.

  Moreover, the kind of pump part 62 is not limited. For example, the pump unit 62 may be a submersible pump. The submersible pump may be disposed in at least one of the ground water 89 in the first well 81 and the ground water 89 in the second well 82.

  Moreover, although the control part 24 was provided in the heat pump part 2, it is not limited to this. The control unit 24 may be provided separately from the heat pump unit 2. Although the water surface 811 of the ground water 89 of the first well 81 and the water surface 821 of the ground water 89 of the second well 82 are at the same position in the vertical direction, they may be at different positions.

  Although the temperature of the liquid 17 flowing through the flow path 13 is acquired (S10) and the flow rate of the ground water 89 flowing through the ground water flow path 61 is determined (S11), the present invention is not limited to this. For example, the temperature of the liquid 17 flowing through the flow path 13 may not be acquired, and the flow rate of the ground water 89 flowing through the ground water flow path 61 may not be determined and changed. In this case, for example, the flow rate of the groundwater 89 flowing through the groundwater flow path 61 may be fixed.

  In addition, when the flow rate of the groundwater 89 flowing through the groundwater flow path 61 acquired in S15 is equal to or lower than the predetermined flow rate (S16: YES), the CPU 241 reverses the water supply in the groundwater flow path 61, or the groundwater flow path 61 Although it drained from, it is not limited to this. For example, even if the flow rate is equal to or lower than a predetermined flow rate, the water supply in the groundwater flow path 61 may not be reversed and may not be drained. In this case, the flow rate of the groundwater 89 flowing through the groundwater flow path 61 may not be acquired.

  Moreover, although the 1st well 81 and the 2nd well 82 were each provided, it is not limited to this. It is sufficient that at least one first well 81 is provided. Further, it is sufficient that at least one second well 82 is provided. For example, in the heat pump system 20 according to the modification shown in FIG. 6, two first wells 81 and two second wells 82 are provided. In addition, in the example shown in FIG. 6, since the building 78 (refer FIG. 1) side from the heat pump part 2 is the same structure, illustration is abbreviate | omitted (FIG. 7 is also the same). In FIG. 6, the same components as those of the heat pump system 1 of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted (the same applies to FIG. 7).

  In the example shown in FIG. 6, the flow path 133 reaches the branch point 142 from the branch point 141 through the two first wells 81. The flow path 134 reaches the branch point 142 from the branch point 141 through the two second wells 82.

  The groundwater flow path 61 connects two first wells 81 and two second wells 82. The groundwater flow path 611 branches at the branch point 801 and reaches the two first wells 81. The groundwater flow path 612 branches at the branch point 802 and reaches the two second wells 82. The CPU 241 controls the pump unit 62 to send ground water 89 from one of the two first wells 81 and the two second wells 82 to the other (see arrows 181 and 182 in FIG. 6).

  In the example shown in FIG. 6, a plurality (two in the present embodiment) of U-tube heat exchangers 137 disposed in the plurality of (two in the present embodiment) first wells 81 in the flow path 13. Were connected in series. Further, in the flow path 13, (in this embodiment, two) U-shaped tube heat exchangers 138 arranged in a plurality (two in this embodiment) of the second wells 82 are connected in series. However, it is not limited to this. For example, in the flow path 13, a plurality of U-tube heat exchangers 137 may be arranged in parallel. Further, for example, in the flow path 13, a plurality of U-tube heat exchangers 138 may be arranged in parallel.

  For example, in the heat pump system 201 according to the modification shown in FIG. 7, the flow path 13 branches or merges at the branch points 143, 144, 145, 146, and 147, and two U-shaped heat exchangers 137, Two U-tube heat exchangers 138 are connected. Two U-shaped heat exchangers 137 are arranged in parallel, and two U-shaped heat exchangers 138 are arranged in parallel. Note that the positions and number of the flow meters 952 and 953 and the temperature sensors 905 and 906 are not limited.

1, 20, 201 Heat pump system 2 Heat pump unit 11, 12, 13, 131, 132, 133, 134 Channel 16, 17 Liquid 21 Heat exchange unit 61, 611, 612 Groundwater channel 62 Pump unit 81 First well 82 No. Two wells 89 Groundwater 137,128 U-tube heat exchanger 241 CPU
613 1st opening part 614 2nd opening part 851 1st water-permeable formation 852 2nd water-permeable formation

Claims (9)

A flow path through which a liquid flows, wherein the ground water in at least one first well and the liquid exchange heat, and the liquid flow path that exchanges heat between the ground water in at least one second well and the liquid;
A heat pump connected to the liquid flow path and utilizing the temperature of the liquid flowing through the liquid flow path;
A groundwater flow path that connects the first well and the second well and is a flow path through which the groundwater is sent,
A pump unit disposed in the groundwater flow path;
A heat pump system comprising: a water supply control unit that controls the pump unit and supplies the groundwater from one to the other of the first well and the second well.   The heat pump system according to claim 1, wherein the water supply control means intermittently executes the water supply of the groundwater.   The water supply switching means for switching between a case where the ground water is supplied from the first well to the second well and a case where the ground water is supplied from the second well to the first well. The heat pump system according to 1 or 2. A temperature difference acquisition means for acquiring a temperature difference between the groundwater of the first well and the groundwater of the second well;
Temperature difference determination means for determining whether or not the temperature difference acquired by the temperature difference acquisition means is a predetermined value or more,
The said water supply control means starts the water supply of the said groundwater, when it is judged by the said temperature difference judgment means that the said temperature difference is more than predetermined value, The water supply control means in any one of Claim 1 to 3 characterized by the above-mentioned. Heat pump system. Flow rate acquisition means for acquiring the flow rate of the groundwater flowing through the groundwater flow path;
Flow rate determining means for determining whether or not the flow rate acquired by the flow rate acquiring means is equal to or less than a predetermined flow rate;
When the flow rate determining unit determines that the flow rate is equal to or lower than a predetermined flow rate, the flow rate control unit reversely feeds water in the groundwater flow channel, or includes a flow channel control unit that drains the groundwater from the groundwater flow channel. The heat pump system according to any one of claims 1 to 4, wherein Liquid temperature acquisition means for acquiring the temperature of the liquid flowing in the liquid flow path;
Flow rate determining means for determining the flow rate of the groundwater flowing through the groundwater flow path according to the temperature of the liquid acquired by the liquid temperature acquisition means,
The heat pump system according to any one of claims 1 to 5, wherein the water supply control means supplies the groundwater at a flow rate determined by the flow rate determination means. Provided in the groundwater flow path, disposed in the first well, comprising a first opening through which the groundwater flows in or out,
The said 1st opening part has been arrange | positioned in the same position as the 1st formation in which the said groundwater is supplied to a said 1st well, or the said 1st formation, The any one of Claim 1 to 6 characterized by the above-mentioned. The described heat pump system. Provided in the groundwater flow path, disposed in the second well, comprising a second opening through which the groundwater flows in or out,
The said 2nd opening part has been arrange | positioned in the same position as the 2nd formation with which the said groundwater is supplied to a said 2nd well, or the said 2nd formation, The any one of Claim 1 to 7 characterized by the above-mentioned. The described heat pump system.   The heat pump system according to claim 1, wherein the pump unit is disposed on land.

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