JP5005751B2 - Cold, hot, cold / hot heat pump system - Google Patents

Description

  The present invention relates to a cold, hot, cold / hot heat pump system using geothermal heat.

  2. Description of the Related Art Conventionally, a heat pump system that performs indoor cooling or heating using the heat of well water has been proposed. Well water is similar to the underground temperature and has little annual fluctuation. It is characterized by being lower than the outside temperature in summer and higher than the outside temperature in winter. Therefore, a heat pump system that uses the heat of well water for cooling or heating, for example, can be operated with higher efficiency than a heat pump system that uses outside air temperature. As a heat pump system using this well water, the one disclosed in Patent Document 1 has been proposed. This system will be described with reference to FIG.

  A compressor 62 is connected in the middle of the heat medium gas circulation pipe 61 of the heat pump system shown in FIG. 9, and indoor heat for heating provided indoors is connected to the circulation pipe 61 on the downstream side of the compressor 62. The exchanger 63, the expansion valve 64, the first outdoor heat exchanger 65 that is disposed outdoors and exchanges heat between the atmosphere and the heat medium gas, and heat exchange between the underground heat medium and the heat medium gas. The 2nd outdoor heat exchanger 66 is connected in order.

  A heat medium liquid circulation pipe 67 for circulating an antifreeze liquid as a heat medium liquid is connected to the primary side of the second outdoor heat exchanger 66. A circulation pump 68 is connected in the middle of the circulation pipe 67. A well case 70 is accommodated in the excavation well 69. A ground heat collecting region formed between the excavation well 69 and the well case 70 is connected in series with the circulation pipe 67 via headers 71 and 72 in the middle of the heat transfer medium circulation pipe 67. The collected heat collecting pipe 73 is accommodated. A well pump 74 is accommodated in the well case 70, and the well water pumped up by the well pump 74 is discharged to the outside through a pumping pipe 75. A heat exchanger 76 is provided between the pumping pipe 75 and the heat medium liquid circulation pipe 67 so that heat exchange is performed between the well water and the antifreeze liquid in the heat medium liquid circulation pipe 67. . Well water provided to the heat exchanger 76 is drained into a drainage groove 77.

  In the winter season, when the heating operation of the heat pump system is started, the compressor 62, the circulation pump 68, and the well pump 74 are started. Then, the heat transfer medium gas compressed by the compressor 62 and having a high temperature and high pressure is supplied to the indoor heat exchanger 63, where heat exchange is performed between the high temperature heat transfer medium gas and the indoor low temperature air. And the room is heated. The low-temperature heat medium liquid flowing out from the indoor heat exchanger 63 is evaporated by the expansion valve 64 to become a heat medium gas. The heat medium gas is supplied to the first outdoor heat exchanger 65, heated by the first outdoor heat exchanger 65, and supplied to the compressor 62.

  On the other hand, when the circulation pump 68 is activated, the antifreeze liquid in the heat medium liquid circulation pipe 67 and the heat collection pipe 73 is circulated. For this reason, the antifreeze liquid in the heat collection pipe 73 is warmed by the geothermal heat in the heat collection area, the heated antifreeze liquid is supplied to the second outdoor heat exchanger 66, and the heat transfer medium gas in the circulation pipe 61 is heated. , And supplied to the compressor 62. Therefore, the heat medium gas can be set to a high temperature and a high pressure, and the heating efficiency is improved. The antifreeze liquid cooled by the second outdoor heat exchanger 66 is sent to the heat collecting pipe 73, heated to substantially the same temperature as the underground heat, and supplied to the second outdoor heat exchanger 66 again. .

JP 2009-2595 A

  However, in the conventional heat pump system for heating, the circulation pipe 61 for circulating the heat medium gas, the heat medium liquid circulation pipe 67 and the heat collection pipe 73 for collecting underground heat are separately provided. Since it was provided, the 2nd outdoor heat exchanger 66 is needed. For this reason, there existed a problem that a number of parts increased, manufacture and construction work were troublesome, and it was difficult to reduce those costs. In addition, during operation of the heat pump, it is necessary to always operate the circulation pump 68, so that there is a problem that power consumption increases and heating efficiency cannot be improved.

Further, when a heat pump system using geothermal heat is used for cooling, hot water supply, or snow melting, there are problems similar to those described above.
The present invention eliminates the problems in the prior art described above, reduces the number of parts, facilitates manufacturing and construction work, and can improve the thermal efficiency. -To provide a thermal heat pump system.

In the present invention, a compressor, a heat exchanger, an expansion valve, and a load side heat exchanger are connected to the heat medium gas circulation pipe, and the heat medium gas compressed by the compressor is cooled and liquefied by the heat exchanger. Then, in the cold heat pump system in which a liquid heat medium is expanded and vaporized by the expansion valve and supplied to the load-side heat exchanger to generate cold, well water in a well case buried in the ground A heat pump is formed by housing a part of the heat medium gas circulation pipe as a heat radiation exchange pipe in the water storage chamber of the well case, and the load side heat exchanger. A load sensor that detects the load of the well pump, and when the detected value of the load detected by the load sensor is equal to or greater than a set value, the well pump is operated, and when the detected value is equal to or less than the set value, the well pump is Control signal to stop And a control unit for outputting a drainage pipe of the well pump, between the heating medium gas circulating pipes leading to the inlet of the heat exchange pipe from said compressor, and well water and heat medium gas during operation of the well pump It is a cold heat pump system provided with a heat exchanger for performing heat exchange.

The load sensor is a temperature sensor that directly or indirectly detects the temperature of the well water in the well case, and the control device detects the temperature of the well water detected by the temperature sensor during a cooling operation. In the cold heat pump system configured to operate the well pump when a value is equal to or greater than a set value and output a control signal to stop the well pump when the detected value is equal to or less than a set value. is there.

In addition, a compressor, a load-side heat exchanger, an expansion valve, and a heat exchanger are connected to the heat-medium gas circulation pipe, and the high-temperature and high-pressure heat-medium gas compressed by the compressor is used as the load-side heat exchanger. The heating medium gas cooled and cooled by the heat exchanger is decompressed and expanded by an expansion valve and supplied as a heating medium gas to the heat collecting exchanger, the heating medium gas is heated by the heat exchanger, and the heat medium gas is heated. In the thermal heat pump system in which the medium gas is compressed by a compressor, supplied to the load side heat exchanger, and generates heat.
A well pump for pumping and draining well water from a well case buried in the ground is provided, and a part of the heat medium gas circulation pipe is accommodated as a heat collection exchange pipe in the water storage chamber of the well case, and the heat collection And a load sensor configured to detect a load of the load-side heat exchanger. When the detected value of the load detected by the load sensor is equal to or greater than a set value, the well pump is operated and the detection is performed. A control device that outputs a control signal for stopping the well pump when the value is equal to or less than a set value; a drain pipe of the well pump; and a heat medium gas circulation pipe extending from the outlet of the heat exchange pipe to the compressor In the above-described thermal heat pump system, a heat exchanger for exchanging heat between the well water and the heat transfer medium gas during operation of the well pump is provided.

Wherein the load sensor is a temperature sensor for directly or indirectly detecting the temperature of well water in the well casing, said control device, the temperature of the detection value of well water detected by the temperature sensor in thermal operation The thermal heat pump system is configured to operate the well pump when the value is equal to or less than a set value, and to output a control signal for stopping the well pump when the detected value is equal to or greater than the set value. .

A cold heat pump system of claim 1, claim combining a thermal heat pump according to 3, wherein the cold-heat equation which is configured to be capable of switching the operating state for generating an operation state or heat to generate cold It is a heat pump system.

A drain pipe of the well pump, single heat exchanger is provided, the operating state for generating an operation state or heat to generate cold heat between the heating medium gas circulating pipes leading to the heat exchange pipe from said compressor It is the said cold / heat type heat pump system comprised so that it can utilize in .

After connecting a compressor, a heat exchanger, an expansion valve, and a load side heat exchanger to the heat medium gas circulation pipe, the heat medium gas compressed by the compressor is cooled and liquefied by the heat exchanger, In a cold heat pump system in which a liquid heat medium is expanded and vaporized by an expansion valve and supplied to the load-side heat exchanger to generate cold heat, the heat in the liquid storage chamber of the well case buried in the ground A circulation means for circulating the liquid medium is provided, and in the liquid storage chamber, a part of the heat medium gas circulation pipe is accommodated as a heat radiation exchange pipe to constitute the heat radiation exchanger, and the load of the load side heat exchanger A load sensor for detecting the load, and when the detected value of the load detected by the load sensor is equal to or higher than a set value, the circulating means is operated, and when the detected value is equal to or lower than the set value, the circulating means is stopped. and a controller for outputting a control signal It is a thermal heat pump system.

The said well case is arrange | positioned in the perpendicular direction, and the said heat dissipation exchanger is the said cold heat pump system accommodated in the upper storage chamber or lower storage chamber of a well case .

Connect the compressor, load-side heat exchanger, expansion valve, and heat exchanger to the heat- medium gas circulation pipe, and supply the high-temperature and high-pressure heat-medium gas compressed by the compressor to the load-side heat exchanger. The heating medium gas cooled by the heat exchanger is decompressed and expanded by an expansion valve and supplied to the heat collecting exchanger as a heating medium gas, and the heating medium gas is heated by the heat exchanger, and the heating medium gas In the thermal heat pump system that compresses the gas by a compressor and supplies it to the load-side heat exchanger to generate heat, the heat transfer liquid in the liquid storage chamber of the well case buried in the ground is circulated. A circulation means is provided, and a part of the heat medium gas circulation pipe is accommodated in the liquid storage chamber as a heat collection exchange pipe to constitute the heat collection exchanger, and a load of the load side heat exchanger is detected. When a load sensor is provided and the load detection value detected by the load sensor is greater than or equal to the set value, Operates the serial circulating means is a thermal heat pump system comprising a control device for the detected value to output a control signal for stopping the circulating means when the set value or less.

The well case is arranged in a vertical direction, and the heat collection exchanger is the thermal heat pump system described above that is housed in an upper storage chamber or a lower storage chamber of the well case .

A cold / thermal heat pump system configured to combine the cold heat pump system according to claim 7 and the hot heat pump according to claim 9 so as to be switchable between an operation state for generating cold or an operation state for generating heat. It is.

The heat collecting exchanger is accommodated in the upper storage chamber of the well case, the heat dissipation exchanger is accommodated in the lower storage chamber, the cooling exchanger is selectively operated during the cold operation, and the thermal operation is performed, The cold / hot heat pump system configured to selectively operate the heat collection exchanger .

(Function)
According to the first aspect of the present invention, when the load of the load-side heat exchanger is high and the detection value detected by the load sensor is higher than a set value in the operation state of the heat pump, the well pump is operated. When the load on the load side heat exchanger is low and the detected value of the load sensor is lower than the set value, the operation of the well pump is stopped. For this reason, in the operation state of the heat pump, the operation time of the well pump can be shortened, and for example, the cooling efficiency or the cooling water supply efficiency can be improved.

  In the first aspect of the invention, since the heat medium gas in the heat medium gas circulation pipe is directly heat-exchanged with the well water, the heat medium gas compressed by the compressor is cooled by the well water to be converted from the gas to the liquid. When changing to a heat medium, the heat of the well water is stored as latent heat in the liquid heat medium. For this reason, the heat storage efficiency of heat-medium gas can be improved, for example, cooling efficiency or cold water supply efficiency can be improved.

  Furthermore, in the invention according to claim 1, a part of the heat medium gas circulation pipe is a heat radiation exchange pipe, and this pipe is accommodated in a water storage chamber of a well case to form a heat radiation exchanger. Therefore, a liquid heat medium circulation pipe that circulates the liquid heat medium separately from the heat medium gas circulation pipe is embedded in the excavation well, and a heat radiation exchanger is provided between the liquid heat medium circulation pipe and the heat medium gas circulation pipe. There is no need. For this reason, the number of parts can be reduced, manufacturing and construction work can be easily performed, and the cost can be reduced.

  According to a fourth aspect of the present invention, when the load on the load side heat exchanger is high and the detected value detected by the load sensor is higher than a set value in the thermal operation state of the heat pump, the well pump is operated. When the load on the load side heat exchanger is low and the detection value of the load sensor is lower than the set value, the operation of the well pump is stopped. For this reason, the operation time of a well pump can be shortened in the thermal operation state of a heat pump, for example, heating efficiency or hot water supply efficiency can be improved.

  In the invention according to claim 4, since the heat medium gas in the heat medium gas circulation pipe is directly exchanged with the well water, the heat medium gas decompressed and expanded by the expansion valve is heated by the well water to be liquid. When changing from the heat medium to the heat medium gas, the heat medium gas is stored as latent heat. For this reason, the heat storage efficiency of heat-medium gas can be improved, for example, heating efficiency or warm water supply efficiency can be improved.

  Furthermore, in the invention described in claim 4, a part of the heat medium gas circulation pipe is a heat collection exchange pipe, and this pipe is accommodated in a water storage chamber of a well case to form a heat collection exchanger. Therefore, a liquid heat medium circulation pipe that circulates the liquid heat medium separately from the heat medium gas circulation pipe is embedded in the excavation well, and a heat exchanger is installed between the liquid heat medium circulation pipe and the heat medium gas circulation pipe. There is no need to provide it. For this reason, the number of parts can be reduced, manufacturing and construction work can be easily performed, and the cost can be reduced.

  In the invention according to claim 9 or 10, when the load of the load-side heat exchanger is high and the detected value detected by the load sensor is higher than a set value in the operating state of the heat pump, the circulating means is When the load side heat exchanger is activated and the load sensor detects a lower value than the set value, the circulating means is stopped. For this reason, in the operation state of the heat pump, the operation time of the circulation means can be shortened, and for example, the cooling efficiency or the cooling water supply efficiency can be improved.

  The invention according to claim 11 or 12 is characterized in that, in the thermal operation state of the heat pump, when the load of the load-side heat exchanger is high and the detected value detected by the load sensor is higher than a set value, the circulating means Is activated and the circulation means is stopped when the load of the load side heat exchanger is low and the detection value of the load sensor is lower than the set value. For this reason, in the thermal operation state of the heat pump, the operation time of the circulation means can be shortened, and for example, the heating efficiency or the hot water supply efficiency can be improved.

  According to the invention of the cold heat pump system according to any one of claims 1 to 3, 9, and 10, the number of parts can be reduced, manufacturing and construction work can be easily performed, and cooling efficiency can be improved. Can be improved.

  According to the invention of the thermal heat pump system according to any one of claims 4 to 6, 11, or 12, the number of parts can be reduced, manufacturing and construction work can be easily performed, and thermal efficiency can be improved. Can be improved.

  According to the invention of the cold / thermal heat pump system according to any one of claims 7, 8, 13, and 14, the number of parts can be reduced, and manufacturing and construction work can be easily performed. Efficiency and thermal efficiency can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic circuit diagram showing a first embodiment that embodies the cold / hot heat pump system of the present invention. The block circuit diagram which shows the control apparatus of a heat pump system. The schematic circuit diagram which shows 2nd Embodiment of this invention. The schematic circuit diagram which shows 3rd Embodiment of this invention. FIG. 10 is a schematic circuit diagram showing a fourth embodiment of the invention. FIG. 10 is a schematic circuit diagram showing a fifth embodiment of the invention. The fragmentary sectional view which shows another embodiment of this invention. The fragmentary sectional view which shows another embodiment of this invention. The schematic circuit diagram of the conventional heat pump system.

Hereinafter, a first embodiment in which the present invention is embodied in an air-conditioning heat pump system using the heat of well water will be described with reference to FIGS. 1 and 2.
Initially, the whole structure of an air conditioning heating pump system is demonstrated based on FIG. Housed in an outdoor unit case 11 provided outside the house is a compressor 12 that sucks and compresses a low-temperature / low-pressure heat transfer gas and discharges the high-temperature / high-pressure heat transfer gas. . An indoor heat exchanger 15 as a load side heat exchanger disposed on the indoor side is connected to the discharge port of the compressor 12 via a discharge pipe 13 and a four-way valve 14. An expansion valve 17 disposed in the outdoor unit case 11 is connected to the indoor heat exchanger 15 via a heat medium pipe 16. The expansion valve 17 is connected to a ground heat exchanger 20 functioning as a heat collection exchanger or a heat radiation exchanger installed in the ground via a heat medium pipe 18a and a joint 19a. The underground heat exchanger 20 includes a well case 21 buried in the ground, a filter 22 accommodated in a lower end opening of the well case 21, and a well case 21 formed above the filter 22. It is comprised by the heat exchange pipe 23 which functions as a thermal radiation exchange pipe or heat collection exchange pipe accommodated in the water storage chamber 21a. A sealing lid 24 is joined to the upper end opening of the well case 21. One end portion of the heat exchange pipe 23 accommodated in the water storage chamber 21a is led out through the sealing lid 24 and connected to the heat medium pipe 18a by the joint 19a. The other end of the heat exchange pipe 23 is led out to the outside through the sealing lid 24 and connected to a joint 19 b provided in the outdoor unit case 11. The compressor 12 is connected to the joint 19b through the heat medium pipe 18b, the four-way valve 14 and the suction pipe 25.

  In the first embodiment, the discharge pipe 13, the heat medium pipe 16, the heat medium pipe 18a, the heat exchange pipe 23, the heat medium pipe 18b, the suction pipe 25, and the like form a closed loop heat medium gas circulation pipe of the heat pump system. P is configured. The heat exchange pipe 23 is a part of the heat medium gas circulation pipe P. In the first embodiment, a two-component pseudo azeotrope (HFCR-410A) composed of HFC-32 and HFC-125 is used as the heat medium gas. This HFC · R-410A is mixed with POE (polyol ester) refrigerating machine oil having high compatibility with the R-410A (weight ratio of POE 18%). By using this heat medium, the refrigeration oil rises from the bottom of the well case 21 having a large depth (50 to 100 m) and returns to the compressor 12 without using an oil trap. 12 lubrication is performed properly. R-407C (a ternary non-azeotropic mixture composed of HFC-32, HFC-125, and HFC-134a) may be used as the heating medium.

  A suction flange of a well pump 26 is connected to the sealing lid 24, a drain pipe 27 is connected to a discharge flange of the well pump 26, and a tip portion thereof is inserted into a drain groove 28 provided on the ground. A branch drain pipe 30 is connected to the drain pipe 27 via an electromagnetic switching valve 29. A heat exchanger 31 is provided between the drain pipe 27 and the heat medium pipe 18b, and is operated as necessary during heating operation. The heat exchanger 31 in the heat medium pipe 18b is heated by the heat of the well water in the drain pipe 27. The heat medium gas can be heated by heat exchange. Between the branch drain pipe 30 and the heat medium pipe 18a, a heat exchanger 32 that is operated as necessary during cooling operation is provided, and the heat medium pipe 18a is heated by the heat of the well water in the branch drain pipe 30. The heat medium gas inside can be cooled by heat exchange.

  A heat medium pipe 18b between the heat exchanger 31 and the four-way valve 14 is provided with a first temperature sensor 33 as a load sensor. The first temperature sensor 33 detects the temperature of the heat transfer medium gas in the heating operation state and indirectly detects the temperature of the well water in the water storage chamber 21a of the well case 21. A second temperature sensor 34 as a load sensor is provided in the heat medium pipe 18 a between the heat exchanger 32 and the expansion valve 17. The second temperature sensor 34 detects the temperature of the heat transfer medium gas in the heat transfer medium pipe 18a and indirectly detects the well water in the water storage chamber 21a of the well case 21 when the heat pump system is in the cooling operation state. It has become.

Next, a control system that controls the operation of the heat pump system will be described.
As shown in FIG. 2, the control device 35 is provided with a central processing unit (CPU) 36 for performing various types of arithmetic processing based on various types of data, and a read / write for recording a control operation program and the like. Only memory (ROM) 37 is provided. The control device 35 is provided with a readable / writable random access memory 38 (RAM) for storing various data.

  The control device 35 is connected to the first and second temperature sensors 33, 34, and is connected to a variable speed motor M 1 that drives the compressor 12 and a motor M 2 that drives the well pump 26. The control device 35 is connected to an electromagnetic solenoid S1 for switching the four-way valve 14 and an electromagnetic solenoid S2 for switching the switching valve 29.

  The CPU 36 is provided with a rotational speed control unit 39 for controlling the rotational speed of the motor M1. The rotational speed control unit 39 controls the rotational speed of the motor M1, the drive amount of the compressor 12 is controlled by an inverter (frequency), and is compressed according to the load state of the indoor heat exchanger 15 of the heat pump system. The drive amount of the machine 12 is appropriately controlled.

  During the heating operation, the CPU 36 compares the detected value of the temperature detected by the first temperature sensor 33 with a set value stored in advance in a storage medium (for example, the RAM 38 or the like). As will be described later, a first well pump control unit 40 for on / off control of the operation of the pump 26 is provided.

  During the cooling operation, the CPU 36 compares the detected value of the temperature detected by the second temperature sensor 34 with a set value stored in advance in a storage medium (for example, the RAM 38). A second well pump control unit 41 for on / off control of the operation of the pump 26 is provided as will be described later.

  The control device 35 is provided with a remote control switch 42 for remotely operating the heating operation or cooling operation of the heat pump system. The remote control switch 42 is provided with a switch for selecting a cooling operation or a heating operation, a setting button for setting the indoor temperature, and the like.

Next, each operation of the heating operation and the cooling operation of the cooling / heating heat pump system configured as described above will be described.
(Heating operation)
When the heating selection switch of the remote control switch 42 is operated, the indoor temperature setting switch is operated to set the heating temperature, and when the start switch is turned on, the heating operation of the heat pump is started. In the heating operation state, since the four-way valve 14 is switched as shown in FIG. 1, the heat medium gas in the heat medium gas circulation pipe P flows as shown by the solid line arrow in FIG. The high-temperature and high-pressure heat medium gas pressurized by the compressor 12 is cooled by the indoor heat exchanger 15, and the indoor air is warmed and used for heating. Thereafter, the heat medium gas in the indoor heat exchanger 15 is cooled to become a heat medium liquid. This heat medium liquid is decompressed and expanded by the expansion valve 17 to become a gas-liquid two-phase heat medium, and is supplied to the heat exchange pipe 23 of the underground heat exchanger 20 through the heat medium pipe 18a and the joint 19a. The low-temperature gas-liquid two-phase heat medium flowing into the heat exchange pipe 23 is heated by exchanging heat with the well water having a high temperature. In this process, the heat medium is further gasified to become a heat medium gas, and the heat of the well water is stored as latent heat in the heat medium gas, and then the compressor is passed through the joint 19b, the heat medium pipe 18b, the four-way valve 14 and the suction pipe 25. Return to 12.

  For example, when the heat pump is continuously operated for a predetermined time in a state where the heating load of the indoor heat exchanger 15 is large as in the initial heating operation of the heat pump, the temperature of the well water in the water storage chamber 21a of the well case 21 ( (For example, 15 ° C.) is lowered (for example, 5 ° C.) by the heat exchange operation of the underground heat exchanger 20. For this reason, the first well pump control unit 40 determines that the detected value of the temperature of the first temperature sensor 33 is lower than a set value (for example, 10 ° C.), and the motor 35 of the well pump 26 from the controller 35. The drive signal is output to the well pump 26 to operate. By this operation, the well water having a low temperature in the water storage chamber 21a of the well case 21 is pumped up, and groundwater having a higher temperature (15 ° C.) is sucked into the water storage chamber 21a through the filter 22. The temperature of the well water is gradually increased (15 ° C.), and the heat exchange between the well water and the heat transfer gas by the underground heat exchanger 20 is appropriately performed in the high load heating operation.

  In the heating operation state, since the electromagnetic switching valve 29 is switched to the drain pipe 27 side, the pumped well water is supplied to the heat exchanger 31 by the drain pipe 27. For this reason, since the refrigerant gas in the heat medium pipe 18b is heated and supplied to the compressor 12, the heating efficiency is improved.

  When it is determined that the detected temperature value of the first temperature sensor 33 is higher than a set value (for example, 10 ° C.), a stop signal is output from the control device 35 to the motor M2 of the well pump 26, and the well pump 26 is activated. Stopped.

When the high-load heating operation is continued, the indoor temperature rises, and the load on the indoor heat exchanger 15 decreases, the control signal from the rotation speed control unit 39 of the control device 35 is accordingly sent to the compressor 12. The rotational speed of the variable speed motor M1 is reduced, the flow rate of the heat medium gas circulating through the heat medium gas circulation pipe P is reduced, the heat exchange amount of the underground heat exchanger 20 is reduced, and the temperature drop of the well water is suppressed. Is done. For this reason, in the normal heating operation state in which the heating load of the indoor heat exchanger 15 is reduced, the heat required by the underground heat exchanger 20 is not required even if the well pump 26 is operated and the groundwater is not taken into the water storage chamber 21a. Exchange is performed. Therefore, the well pump 26 is operated only when necessary during the heating operation.
(Cooling operation)
On the other hand, in the heat pump stop state, the cooling selection switch of the remote control switch 42 is operated, the indoor temperature setting switch is operated, the cooling temperature is set, and the four-way valve 14 shown in FIG. Is switched to the cooling port and the start switch is turned on, the cooling operation is started. In this cooling operation state, the heat medium gas in the heat medium gas circulation pipe P flows as shown by the dashed arrows in FIG. The high-temperature / high-pressure heat medium gas discharged by the compressor 12 passes through the discharge pipe 13, the four-way valve 14, the heat medium pipe 18 b and the joint 19 b to the heat exchange pipe 23 of the underground heat exchanger 20. Supplied. The high-temperature heat medium gas flowing through the heat exchange pipe 23 is heat-exchanged with well water and condensed to a low temperature and a low pressure to become a liquid heat medium. And this condensed liquid heat medium raises the heat exchange pipe 23, and is guide | induced to the expansion valve 17 through the coupling 19a and the heat medium piping 18a. By this expansion valve 17, the heat transfer fluid is decompressed and expanded to be gasified, resulting in a low temperature. This low-temperature heat medium gas flows into the indoor heat exchanger 15 and absorbs heat from the outside, and is supplied to the indoor cooling. Thereafter, the discharge pipe 13, the four-way valve 14, and the suction pipe 25 are returned to the compressor 12.

  For example, when the heat pump is continuously operated for a predetermined time while the cooling load of the indoor heat exchanger 15 is large as in the early stage of the cooling operation of the heat pump, the temperature of the well water in the water storage chamber 21a of the well case 21 ( (For example, 15 ° C.) is increased (for example, 20 ° C.) by the heat exchange operation of the underground heat exchanger 20. For this reason, the second well pump control unit 41 determines that the detected value of the temperature of the second temperature sensor 34 is higher than a set value (for example, 18 ° C.), and the motor 35 of the well pump 26 from the control device 35. The drive signal is output to the well pump 26 to operate. By this operation, the well water having a higher temperature (20 ° C.) in the water storage chamber 21 a of the well case 21 is pumped up, and groundwater having a lower temperature (15 ° C.) is passed through the filter 22 into the water storage chamber 21 a. The temperature of the well water is lowered, and the heat exchange between the well water and the heating medium gas by the underground heat exchanger 20 is appropriately performed in the high load cooling operation.

  In this cooling operation state, the electromagnetic switching valve 29 is switched to the branch drainage pipe 30 side, so that the pumped well water is supplied to the heat exchanger 32 by the drainage pipe 30. For this reason, since the refrigerant gas in the heat medium pipe 18a is cooled and supplied to the expansion valve 17, the cooling efficiency is improved.

  When it is determined that the detected temperature value of the second temperature sensor 34 is lower than a set value (for example, 18 ° C.), a stop signal is output from the control device 35 to the motor M2 of the well pump 26, and the well pump 26 is activated. Stopped.

  When the high-load cooling operation is continued and the indoor temperature decreases and the load on the indoor heat exchanger 15 decreases, the control signal from the rotation speed control unit 39 of the control device 35 correspondingly causes the compressor 12 to The rotational speed of the motor M1 is reduced, the flow rate of the heat medium gas circulating through the heat medium gas circulation pipe P is reduced, the heat exchange amount of the underground heat exchanger 20 is reduced, and the temperature rise of the well water is suppressed. . For this reason, in the normal cooling operation state in which the cooling load of the indoor heat exchanger 15 is reduced, the heat required by the underground heat exchanger 20 is not required even if the well pump 26 is operated and the groundwater is not taken into the water storage chamber 21a. Exchange is performed. Therefore, the well pump 26 is operated only when necessary during the cooling operation.

According to the air conditioning heat pump system of the first embodiment, the following effects can be obtained.
(1) In the said 1st Embodiment, the heat exchange pipe 23 which comprises the underground heat exchanger 20 was connected to the said joints 19a and 19b so that a part of heat carrier gas circulation piping P of a heat pump system might be comprised. For this reason, heat exchange can be performed directly between the well water in the water storage chamber 21a of the well case 21 and the heat transfer medium gas flowing in the heat exchange pipe 23, reducing the number of parts and facilitating manufacturing and construction work. The cost can be reduced.

  (2) In the said 1st Embodiment, the heating load of the said indoor heat exchanger 15 is large, and as mentioned above, the well water in the water storage chamber 21a of the well case 21 of the said underground heat exchanger 20, and the heat exchange pipe 23 When the temperature of the well water is lowered by heat exchange with the heat transfer medium gas flowing through the medium, the temperature is indirectly detected by the first temperature sensor 33, and the well pump 26 is driven. The well water whose temperature in the water storage chamber 21a is lowered is pumped up and discharged to the outside, and groundwater maintained at a predetermined temperature higher than that is taken into the water storage chamber 21a through the filter 22. On the other hand, a normal heating operation in which the heating load of the indoor heat exchanger 15 decreases and the temperature of the well water in the water storage chamber 21a of the well case 21 does not decrease so much by heat exchange with the heat transfer medium gas flowing through the heat exchange pipe 23. In the case of the state, the operation of the well pump 26 was stopped. For this reason, the power consumption required for the operation of the well pump 26 can be reduced, and the heating efficiency of the heat pump can be improved.

In the cooling operation of the heat pump, the cooling efficiency can be improved for the same reason as in the heating operation.
(3) In the first embodiment, since heat exchange between the heat transfer medium gas in the heat exchange pipe 23 and the well water is performed, the heat transfer medium gas is efficiently stored during heating or cooling by latent heat. Therefore, heating efficiency or cooling efficiency can be improved. On the other hand, in the system in which the antifreeze liquid is circulated by the circulation pump described in the background art and the heat transfer medium gas in the heat transfer medium gas circulation pipe is heat-exchanged by the heat exchanger, the sensible heat of the antifreeze liquid is used. Therefore, the amount of antifreeze must be increased in order to reduce heat storage and perform proper heat exchange.

(4) In the first embodiment, since the antifreeze circulating pump described in the background art is not necessary, power consumption is reduced correspondingly, and cooling efficiency or heating efficiency can be improved.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, the heat exchanger 31 and the heat exchanger 32 in the first embodiment described above are combined into one. For this reason, as shown in FIG. 3, the electromagnetic switching valve 29 and the branch drain pipe 30 provided in the drain pipe 27 are omitted. A first communication pipe 43 and a second communication pipe 44 are connected in parallel between the heat medium pipe 18a and the heat medium pipe 18b. A third communication pipe 45 is connected to the first and second communication pipes 43, 44, and a heat exchanger 48 is connected to the third communication pipe 45 and the drain pipe 27. A first electromagnetic valve 46 and a second electromagnetic valve 47 are connected to the first communication pipe 43. A first check valve 49A and a second check valve 49B are connected to the heat medium pipes 18a and 18b, and a third check valve 49C and a fourth check valve 49D are connected to the second communication pipe 44. It is connected.

  In the second embodiment, the first electromagnetic valve 46 is closed and the second electromagnetic valve 47 is opened in the heating operation state, and both the pipes 18a and 18b and the first to third communication pipes 43 to 45 are opened. The heating medium flows in the direction indicated by the solid line, and the indoor heat exchanger 15 heats the room.

  On the contrary, in the cooling operation state, the first electromagnetic valve 46 is opened and the second electromagnetic valve 47 is closed, and a heat medium is passed through both the pipes 18a and 18b and the first to third communication pipes 43 to 45. Flowing in the direction indicated by the broken line, the indoor heat exchanger 15 cools the room.

In this 2nd Embodiment, since the heat exchanger 48 is one unit, the installation space of the heat exchanger 48 can be reduced.
(Third embodiment)
As shown in FIG. 4, the third embodiment is embodied as a heating-only (thermal) heat pump system by omitting the four-way valve 14, the cooling heat exchanger 32, and the second temperature sensor 34. Is. In the third embodiment, the underground heat exchanger 20 functions as a heat collection exchanger. In the third embodiment, the heat exchanger 31 may be omitted. Further, instead of the indoor heat exchanger 15 connected to the discharge pipe 13 and the heat medium pipe 16, for example, a hot water supply pipe of a hot water supply apparatus, a floor heating pipe, or a snow melting pipe of a snow melting apparatus is connected. You may do it.
(Fourth embodiment)
As shown in FIG. 5, the fourth embodiment is embodied as a cooling-only (cooling type) heat pump system by omitting the four-way valve 14, the heating heat exchanger 31 and the first temperature sensor 33. Is. In the fourth embodiment, the underground heat exchanger 20 functions as a heat dissipation exchanger. In the fourth embodiment, the heat exchanger 32 may be omitted. Further, instead of the indoor heat exchanger 15 connected to the discharge pipe 13 and the well pump 26, for example, a cold water pipe of a cold water supply device may be connected.
(Fifth embodiment)
In the fifth embodiment, as shown in FIG. 6, the heat exchanger pipe 23 is connected to the lower end of the heat medium pipe 18a, and the first branch 51 is connected to the branch 51 and a plurality of branches. The pipe 52 and the second branching unit 53 connected to the upper end portion of each pipe 52 and connected to one heat medium pipe 18b. Further, the filter 22 at the lower end of the well case 21 is omitted so that groundwater does not enter the water storage chamber 21a. The entire depth H of the well case 21 is set to 50 m to 100 m, for example, and the inner diameter is set to 10 cm to 25 cm. Furthermore, the underground heat exchanger 20 (heat exchange pipe 23) is accommodated in the upper storage chamber R1 of the well case 21, and serves as a heat medium between the lower end of the underground heat exchanger 20 and the bottom surface of the well case 21. A lower storage chamber R2 in which only the water is stored is provided. The arrangement length L1 of the heat exchange pipe 23 in the vertical direction is set to 10 m to 20 m, for example. The vertical length L2 of the water storage chamber 21a including the lower storage chamber R2 where the heat exchange pipe 23 is not disposed is set to 80 m to 90 m, for example.

  In the fifth embodiment, a circulation pump 54 is disposed in place of the drainage type well pump 26 described above. The suction port 55 a of the suction pipe 55 connected to the suction port of the circulation pump 54 pumps water at the bottom of the well case 21. An outlet 56a of the discharge pipe 56 connected to the discharge port of the circulation pump 54 is disposed on the upper storage chamber R1. When the circulation pump 54 is operated, the lowermost water in the lower storage chamber R2 of the well case 21 is pumped up and supplied to the upper storage chamber R1, so that the water is circulated in the water storage chamber 21a. It has become.

In the fifth embodiment, the heat exchangers 31 and 32 used in the first embodiment are omitted.
Next, the operation of the air conditioning / heating heat pump system configured as described above will be described.

  In the fifth embodiment, when the heating load of the heat pump system is large, the circulation pump 54 is operated, water is circulated in the water storage chamber 21a, and heat exchange by the underground heat exchanger 20 is appropriately performed. . When the heating load is reduced and the normal operation state is reached, the circulation pump 54 is stopped. In this state, the refrigerant liquid in the heat exchange pipe 23 is heated by the water in the upper storage chamber R1 by the heat exchange operation of the underground heat exchanger 20. For this reason, the water in the upper storage chamber R1 is cooled and flows downward, and the water having a high temperature in the lower storage chamber R2 flows upward, and natural convection of water occurs in the water storage chamber 21a. As a result, even if the circulation pump 54 is not operated, heat exchange by the underground heat exchanger 20 is properly performed in a normal heating operation state.

  On the other hand, when the cooling load of the heat pump system is large, the circulation pump 54 is operated, water is circulated in the water storage chamber 21a, and heat exchange by the underground heat exchanger 20 is appropriately performed. When the cooling load is reduced and the normal operation state is reached, the circulation pump 54 is stopped. In this state, the refrigerant liquid in the heat exchange pipe 23 is cooled by the water in the upper storage chamber R1 by the heat exchange operation of the underground heat exchanger 20. For this reason, the water in the upper storage chamber R1 is heated. Heat of the heated water is transmitted to the ground through the well case 21. As a result, even if the circulation pump 54 is not operated, heat exchange by the underground heat exchanger 20 is properly performed in a normal cooling operation state.

In the fifth embodiment, since the underground heat exchanger 20 is constituted by the first branching device 51, the pipe 52, and the second branching device 53, the underground heat exchange is performed as compared with the case where a serial pipe is used. The length L1 of the flow path of the vessel 20 can be reduced, and construction can be easily performed.
(Example of change)
In addition, you may change the said embodiment as follows.

  -In 5th Embodiment, as shown in FIG. 7, you may provide the said well case 21 in two places, for example. In this case, the depth dimension of each well case 21 can be shortened compared with the case where one well case 21 is used, and the well excavation work can be easily performed.

  As shown in FIG. 8, the underground heat exchanger 20A is also arranged in the lower storage chamber R2, and the underground heat exchanger 20 and the underground heat exchanger 20A are connected to the heat medium pipe 18a via the switching valve 58. It may be connected to the heat medium pipe 18b via the switching valve 59 and connected to the underground heat exchanger 20 and the second branching device 53 of the underground heat exchanger 20A.

  In this embodiment, in the heating operation, the switching valves 58 and 59 are switched to use only the underground heat exchanger 20 in the upper storage chamber R1, and in the cooling operation, the underground in the lower storage chamber R2 is used. Only the heat exchanger 20A is used. During this low-load cooling operation, water in the lower storage chamber R2 is heated by the underground heat exchanger 20A in the lower storage chamber R2, so that convection of water occurs in the water storage chamber 21a and heat exchange is further performed. Done properly.

  In the embodiment shown in FIG. 1, the heat exchanger 31 may be omitted, the heat exchanger 32 may be omitted, or the heat exchanger 31 and the heat exchanger 32 may be omitted. In these cases, the well water in the water storage chamber 21a of the well case 21 is discharged to the outside by driving the well pump 26 in a state where the cooling load or the heating load is large. The groundwater is sucked into the water storage chamber 21a, the temperature of the well water is maintained at a predetermined temperature, and it is possible to cope with a high load operation of the heat pump system.

The first and second temperature sensors 33 and 34 may be accommodated in the water storage chamber 21a of the well case 21 to directly detect the temperature of the well water.
In place of the first temperature sensor 33, a first pressure sensor may be used. In this case, for example, when the detected value of the pressure of the heat medium gas in the heat medium gas circulation pipe P is equal to or higher than the set value, the well pump 26 is operated, and when the detected value is equal to or lower than the set value, the operation of the well pump 26 is stopped. The

  In place of the second temperature sensor 34, a second pressure sensor may be used. In this case, for example, the well pump 26 is operated when the detected value of the pressure of the heating medium gas in the heating medium gas circulation pipe P is equal to or lower than the set value, and the operation of the well pump 26 is stopped when the detected value is equal to or higher than the set value. The

-As a load sensor, the temperature sensor which measures indoor temperature may be provided, and the magnitude of the load at the time of heating or air_conditionaing | cooling operation may be determined with the detected value and setting value of this temperature sensor.
In the fifth embodiment shown in FIG. 6, the four-way valve 14 may be omitted and embodied as a cold heat pump system or as a thermal heat pump system.

-Although it is not illustrated as a circulation means of 5th Embodiment, in the water storage chamber 21a of the said well case 21, you may accommodate the stirring blade rotated by a motor.
-In 5th Embodiment, you may make it store antifreeze liquids, such as a long life coolant, for example, as a heat-medium liquid accommodated in the water storage chamber 21a of the said well case 21 other than water.

In the fifth embodiment, the underground heat exchanger 20 may be accommodated in the lower storage chamber R2 of the well case 21.
-In 5th Embodiment, you may comprise the said heat exchange pipe 23 in a coil shape.

  The well case 21 may be arranged not in the vertical direction but in the horizontal direction or inclined.

  P: Heat medium gas circulation pipe, R1: Upper storage chamber, 12: Compressor, 17: Expansion valve, 21: Well case, 21a: Water storage chamber, 23: Heat exchange pipe, 26: Well pump, 27, 30 ... Drainage Pipe, 31, 32, 48 ... heat exchanger, 35 ... control device, 56a ... outlet.

Claims (12)

After connecting a compressor, a heat exchanger, an expansion valve, and a load side heat exchanger to the heat medium gas circulation pipe, the heat medium gas compressed by the compressor is cooled and liquefied by the heat exchanger, In the cold heat pump system in which the liquid heat medium is expanded and vaporized by an expansion valve and supplied to the load-side heat exchanger to generate cold.
The heat exchanger is provided with a well pump that pumps and drains well water in a well case buried in the ground, and a part of the heat medium gas circulation pipe is accommodated as a heat dissipation exchange pipe in a water storage chamber of the well case. And a load sensor for detecting the load of the load side heat exchanger is provided, and when the detected value of the load detected by the load sensor is greater than or equal to a set value, the well pump is operated, and the detected value is A control device that outputs a control signal for stopping the well pump when the set value is not more than a set value; a drain pipe of the well pump; and a heat transfer medium gas circulation pipe extending from the compressor to an inlet of a heat exchange pipe. A cold heat pump system comprising a heat exchanger for exchanging heat between the well water and the heating medium gas during operation of the well pump . The load sensor is a temperature sensor that directly or indirectly detects the temperature of the well water in the well case, and the control device detects the temperature of the well water detected by the temperature sensor during a cooling operation. claim the value when the set value or more, driving the well pump, characterized in that the detection value is configured to output a control signal to stop the well pump when the set value or less The cold heat pump system according to 1. Connect the compressor, load-side heat exchanger, expansion valve, and heat exchanger to the heat-medium gas circulation pipe, and supply the high-temperature and high-pressure heat-medium gas compressed by the compressor to the load-side heat exchanger. The heating medium gas cooled by the heat exchanger is decompressed and expanded by an expansion valve and supplied to the heat collecting exchanger as a heating medium gas, and the heating medium gas is heated by the heat exchanger, and the heating medium gas In the thermal heat pump system in which the compressor is compressed by a compressor, supplied to the load-side heat exchanger, and generates heat.
A well pump for pumping and draining well water from a well case buried in the ground is provided, and a part of the heat medium gas circulation pipe is accommodated as a heat collection exchange pipe in the water storage chamber of the well case, and the heat collection And a load sensor configured to detect a load of the load-side heat exchanger. When the detected value of the load detected by the load sensor is equal to or greater than a set value, the well pump is operated and the detection is performed. A control device that outputs a control signal for stopping the well pump when the value is equal to or less than a set value; a drain pipe of the well pump; and a heat medium gas circulation pipe extending from the outlet of the heat exchange pipe to the compressor Between the two, a heat exchanger for performing heat exchange between the well water and the heat transfer medium gas during operation of the well pump is provided . The load sensor is a temperature sensor that directly or indirectly detects the temperature of the well water in the well case, and the control device has a detected value of the temperature of the well water detected by the temperature sensor during the thermal operation. in the case of less than the set value, and driving the well pump, according to claim 3, characterized in that the detected value is configured to output a control signal to stop the well pump when the set value or more thermal heat pump system. A cooling heat pump system according to claim 1 and the thermal heat pump according to claim 3 are combined to be switched to an operation state for generating cold or an operation state for generating heat.・ Thermal heat pump system. A drain pipe of the well pump, single heat exchanger is provided, the operating state for generating an operation state or heat to generate cold heat between the heating medium gas circulating pipes leading to the heat exchange pipe from said compressor The cold / heat type heat pump system according to claim 5 , wherein the heat / heat type heat pump system is configured so as to be usable. After connecting a compressor, a heat exchanger, an expansion valve, and a load side heat exchanger to the heat medium gas circulation pipe, the heat medium gas compressed by the compressor is cooled and liquefied by the heat exchanger, In the cold heat pump system in which the liquid heat medium is expanded and vaporized by an expansion valve and supplied to the load-side heat exchanger to generate cold.
Circulating means for circulating the heat transfer fluid in the liquid storage chamber of the well case buried in the ground is provided, and the heat dissipation is achieved by accommodating a part of the heat transfer medium gas circulation pipe as a heat dissipation exchange pipe in the liquid storage chamber. And a load sensor configured to detect a load of the load-side heat exchanger, and when the detected value of the load detected by the load sensor is greater than or equal to a set value, the circulating means is operated and the detection A cooling / heating heat pump system comprising: a control device that outputs a control signal for stopping the circulation means when the value is equal to or less than a set value. The cold heat pump system according to claim 7 , wherein the well case is disposed in a vertical direction, and the heat exchanger is accommodated in an upper storage chamber or a lower storage chamber of the well case. Connect the compressor, load-side heat exchanger, expansion valve, and heat exchanger to the heat-medium gas circulation pipe, and supply the high-temperature and high-pressure heat-medium gas compressed by the compressor to the load-side heat exchanger. The heating medium gas cooled by the heat exchanger is decompressed and expanded by an expansion valve and supplied to the heat collecting exchanger as a heating medium gas, and the heating medium gas is heated by the heat exchanger, and the heating medium gas In the thermal heat pump system in which the compressor is compressed by a compressor, supplied to the load-side heat exchanger, and generates heat.
A circulation means for circulating the heat transfer fluid in the liquid storage chamber of the well case buried in the ground is provided, and in the liquid storage chamber, a part of the heat transfer medium gas circulation pipe is accommodated as a heat collection exchange pipe, Constituting a heat collection exchanger, provided with a load sensor for detecting the load of the load side heat exchanger, and when the detected value of the load detected by the load sensor is greater than or equal to a set value, the circulating means is operated; A thermal heat pump system comprising: a control device that outputs a control signal for stopping the circulation means when the detected value is equal to or less than a set value. The thermal heat pump system according to claim 9 , wherein the well case is disposed in a vertical direction, and the heat exchanger is accommodated in an upper storage chamber or a lower storage chamber of the well case. A cooling heat pump system according to claim 7 and the thermal heat pump according to claim 9 are combined, and can be switched to an operation state for generating cold or an operation state for generating heat.・ Thermal heat pump system. The heat storage exchanger is accommodated in the upper storage chamber of the well case, the heat dissipation exchanger is accommodated in the lower storage chamber, the heat dissipation exchanger is selectively operated during the cold operation, and the heat exchanger The cold / hot heat pump system according to claim 11, wherein the heat collecting exchanger is selectively operated.

Images