KR102180298B1 - High efficiency geothermal heat pump system capable of underground heat compensation and heat recovery - Google Patents

Abstract

The present invention relates to a highly efficient geothermal heat pump system capable of underground heat compensation and heat recovery, allowing a part of a geothermal source before the part of the geothermal source is introduced into a geothermal heat exchanger to be introduced into the geothermal heat exchanger after exchanging heat in a liquid receiver or an auxiliary heat exchanger, so that temperature of the geothermal source can be compensated through heat exchange in the liquid receiver or the auxiliary heat exchanger so as to minimize an underground flow passage installed in the ground and reduce installation and repair costs by minimizing the underground flow passage. Moreover, the temperature of the geothermal source introduced into the geothermal heat exchanger is further increased during heating operation, so that evaporation efficiency of a refrigerant is increased in the geothermal heat exchanger and the refrigerant is additionally cooled in the liquid receiver or the auxiliary heat exchanger to increase a supercooling degree so as to increase a heating capacity and a performance coefficient. In addition, the temperature of the geothermal source introduced into the geothermal heat exchanger can be further decreased during cooling operation, so that condensation efficiency of the refrigerant is increased in the geothermal heat exchanger and the supercooling degree is increased so as to improve a cooling capacity and the performance coefficient. Furthermore, one condensing pressure operating a geothermal source pump and another condensing pressure stopping the geothermal source pump are set to be different from each other, so that the geothermal pump is prevented from being frequently turned on or off by fine variations of the condensing pressure for a short period of time, so that the geothermal pump can be more stably operated.

Description

High efficiency geothermal heat pump system capable of underground heat compensation and heat recovery}

The present invention relates to a high-efficiency geothermal source heat pump system capable of compensating for underground heat and recovering heat, and more particularly, by compensating the temperature of a heat medium heat exchanged from an underground heat exchanger during heating operation, the underground heat exchanger can be compacted. The present invention relates to a high-efficiency geothermal source heat pump system capable of recovering heat and compensating for ground heat in which heat exchange efficiency is increased in a geothermal heat exchanger to improve a system performance coefficient.

In general, heat pumps include an air heat source method that obtains or discharges heat from the atmosphere, a water heat source method that discharges heat through a cooling tower, and a geothermal source method that obtains heat from the ground or discharges heat to the ground.

The geothermal source type heat pump has an advantage of having high energy efficiency compared to the air source type because the temperature of the ground can be maintained substantially constant when the temperature of the ground is above a certain depth.

However, since the heat pump using geothermal heat according to the prior art continuously absorbs or releases heat from the underground heat exchanger, the heat exchange efficiency between the underground heat exchanger and the geothermal heat exchanger of the heat pump decreases, thereby reducing the efficiency. There is a problem. In order to solve this problem, when the number and length of the underground heat exchanger installed in the ground is increased, there is a problem that installation and maintenance costs are high.

Korean Patent Registration No. 10-1336012

An object of the present invention is to provide a high-efficiency geothermal source heat pump system capable of performing ground heat compensation and heat recovery in which heat exchange efficiency and a system performance coefficient can be improved in a geothermal heat exchanger.

In the heat pump system including a compressor, a cooling/heating heat exchanger, a geothermal heat exchanger, an expansion valve and a four-way valve, the high-efficiency geothermal heat pump system according to the present invention includes the compressor, the cooling/heating heat exchanger, the geothermal heat exchanger, the A refrigerant circulation passage formed to circulate the refrigerant from the compressor by connecting the four-way valve and the expansion valve, a cooling/heating water circulation passage through which cooling and heating water circulates, and the geothermal heat exchanger and the ground by connecting the cooling/heating heat exchanger and a heat demander By connecting, a geothermal source circulation passage through which the geothermal heat source circulates, a receiver for temporarily storing refrigerant before flowing into the expansion valve, and a discharge side of the cooling/heating heat exchanger and a suction side of the receiver during heating operation, A first liquid refrigerant flow path for guiding the refrigerant condensed from the cooling and heating heat exchanger to the receiver, and a discharge side of the geothermal heat exchanger and a suction side of the receiver are connected during cooling operation, and in the geothermal heat exchanger during cooling operation A second liquid refrigerant flow path for guiding the condensed refrigerant to the receiver, the geothermal heat source circulation flow channel and the receiver are connected, and some of the geothermal heat sources before flowing into the geothermal heat exchanger heat exchange with the refrigerant in the receiver. A geothermal source temperature compensation flow path for guiding the flow to the geothermal heat exchanger, a geothermal source pump installed in the geothermal heat source temperature compensation flow channel to pump the geothermal source to the receiver, and evaporation of refrigerant before flowing into the compressor A first pressure sensor that measures pressure, a second pressure sensor that measures the condensation pressure of refrigerant before flowing into the expansion valve, and a geothermal source temperature sensor that measures the temperature of the geothermal source before flowing into the geothermal heat exchanger. Wow, controlling the operation of the four-way valve according to an operation mode including a cooling operation and a heating operation, and the geothermal source pump according to a value measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. It includes a control unit to control the operation of.

In a heat pump system comprising a compressor, a cooling and heating heat exchanger, a geothermal heat exchanger, an expansion valve, and a four-way valve, the high-efficiency geothermal heat pump system according to another aspect of the present invention includes the compressor, the cooling and heating heat exchanger, and the geothermal heat exchanger. A refrigerant circulation passage formed to circulate the refrigerant discharged from the compressor by connecting the four-way valve and the expansion valve; a cooling/heating water circulation passage through which cooling and heating water circulates by connecting the cooling and heating heat exchanger to a heat demander; and the geothermal heat exchanger By connecting the tile and the ground, the geothermal source circulation passage through which the geothermal heat source circulates, the auxiliary heat exchanger installed on the suction side of the expansion valve, and the discharge side of the cooling/heating heat exchanger and the suction side of the auxiliary heat exchanger are connected during heating operation. , A first liquid refrigerant flow path for guiding the refrigerant condensed from the cooling and heating heat exchanger to the auxiliary heat exchanger, and the discharge side of the geothermal heat exchanger and the suction side of the auxiliary heat exchanger are connected during cooling operation, and the geothermal heat during cooling operation By connecting the second liquid refrigerant flow path for guiding the refrigerant condensed from the heat exchanger to the auxiliary heat exchanger, the geothermal heat source circulation flow channel and the auxiliary heat exchanger, some of the geothermal heat sources before flowing into the geothermal heat exchanger are the auxiliary heat exchanger. A geothermal source temperature compensation flow path that guides heat exchange with the refrigerant passing through the air and then flows into the geothermal heat exchanger; a geothermal source pump installed in the geothermal source temperature compensation flow channel to pump the geothermal source to the auxiliary heat exchanger; and the compressor A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the expansion valve, a second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve, and the geothermal source before entering the geothermal heat exchanger. A geothermal source temperature sensor that measures temperature and controls the operation of the four-way valve according to an operation mode including a cooling operation and a heating operation, and measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor And a control unit controlling the operation of the geothermal source pump according to a value.

The control unit, during the heating operation, the condensation pressure measured by the second pressure sensor is equal to or higher than a preset first set condensing pressure, and the evaporation pressure measured by the first pressure sensor is the condensation pressure measured by the second pressure sensor. When the compression ratio divided by is equal to or greater than a preset compression ratio and the temperature of the geothermal source measured by the geothermal source temperature sensor is less than or equal to the first preset temperature, the geothermal source pump is operated.

The control unit stops the geothermal source pump when the condensation pressure measured by the second pressure sensor is less than or equal to the second set condensation pressure set lower than the first set condensation pressure while the geothermal source pump is operating.

In the cooling operation, if the condensation pressure measured by the second pressure sensor is equal to or higher than a preset third set condensing pressure, and the temperature of the geothermal source measured by the geothermal source temperature sensor is equal to or higher than the second preset temperature, , The geothermal source pump is operated.

The control unit stops the geothermal source pump when the condensation pressure measured by the second pressure sensor is less than or equal to a fourth set condensation pressure set lower than the third set condensation pressure while the geothermal source pump is operating.

It is connected to the discharge side of the expansion valve, and is installed in the expansion valve discharge passage for heating operation and formed to guide the refrigerant from the expansion valve to the geothermal heat exchanger during heating operation, and installed in the expansion valve discharge passage for heating operation. It further includes a check valve for preventing the refrigerant from flowing back to the expansion valve from the geothermal heat exchanger.

It is connected to the discharge side of the expansion valve and is installed in an expansion valve discharge passage for cooling operation and formed to guide the refrigerant from the expansion valve to the cooling and heating heat exchanger during cooling operation, and in the expansion valve discharge passage for cooling operation. It further includes a check valve for preventing the refrigerant from flowing back to the expansion valve from the heating and cooling heat exchanger.

In a heat pump system including a compressor, a cooling/heating heat exchanger, a geothermal heat exchanger, an expansion valve and a four-way valve, the high-efficiency geothermal heat pump system according to another aspect of the present invention includes the compressor, the cooling/heating heat exchanger, and the geothermal heat. A refrigerant circulation passage formed to circulate the refrigerant from the compressor by connecting the heat exchanger, the four-way valve, and the expansion valve; a cooling/heating water circulation passage through which cooling and heating water circulates by connecting the cooling and heating heat exchanger to a heat demander; and the geothermal heat A geothermal source circulation passage through which the geothermal heat source circulates by connecting the heat exchanger to the ground, a receiver for temporarily storing refrigerant before flowing into the expansion valve, and a discharge side of the cooling and heating heat exchanger and a suction side of the receiver during heating operation By connecting the first liquid refrigerant flow path for guiding the refrigerant condensed from the cooling/heating heat exchanger to the receiver, and the discharge side of the geothermal heat exchanger and the suction side of the receiver during cooling operation, A second liquid refrigerant flow path for guiding the refrigerant condensed from the geothermal heat exchanger to the receiver, and the geothermal heat source circulation flow channel and the receiver are connected, so that some of the geothermal heat sources before flowing into the geothermal heat exchanger are in the receiver. A geothermal source temperature compensation flow path for guiding the flow to the geothermal heat exchanger after heat exchange with the refrigerant, a geothermal source pump installed in the geothermal source temperature compensation flow channel to pump the geothermal source to the receiver, and before flowing into the compressor A first pressure sensor that measures the evaporation pressure of the refrigerant at, a second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve, and measures the temperature of the geothermal source before flowing into the geothermal heat exchanger. Controls the operation of the four-way valve according to an operation mode including a geothermal source temperature sensor and a cooling operation and a heating operation, and according to values measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. And a control unit for controlling the operation of the geothermal source pump, wherein the control unit includes, during heating operation, a condensation pressure measured by the second pressure sensor equal to or higher than a first preset condensing pressure, and The compression ratio, which is a value obtained by dividing the condensation pressure measured by the second pressure sensor by the evaporation pressure measured by the first pressure sensor, is equal to or greater than the preset compression ratio, and the temperature of the geothermal source measured by the geothermal source temperature sensor is preset first. If the temperature is less than the set temperature, the geothermal source pump is operated, and during cooling operation, the condensation pressure measured by the second pressure sensor is equal to or higher than the third preset condensing pressure, and the temperature of the geothermal source measured by the geothermal source temperature sensor Is higher than a preset second set temperature, the geothermal source pump is operated, and the condensation pressure measured by the second pressure sensor is lower than the first set condensing pressure while the geothermal source pump is operating during the heating operation. If it is less than the set second set condensing pressure, the geothermal source pump is stopped, and the condensation pressure measured by the second pressure sensor is set lower than the third set condensing pressure while the geothermal source pump is operating during the cooling operation. If it is less than or equal to the fourth set condensing pressure, the geothermal source pump is stopped.

In a heat pump system including a compressor, a cooling/heating heat exchanger, a geothermal heat exchanger, an expansion valve and a four-way valve, the high-efficiency geothermal heat pump system according to another aspect of the present invention includes the compressor, the cooling/heating heat exchanger, and the geothermal heat. A refrigerant circulation passage formed to circulate the refrigerant from the compressor by connecting the heat exchanger, the four-way valve, and the expansion valve; a cooling/heating water circulation passage through which cooling and heating water circulates by connecting the cooling and heating heat exchanger to a heat demander; and the geothermal heat By connecting the heat exchanger to the ground, the geothermal source circulation passage through which the geothermal heat source circulates, the auxiliary heat exchanger installed on the suction side of the expansion valve, and the discharge side of the cooling/heating heat exchanger and the suction side of the auxiliary heat exchanger are connected during heating operation. Thus, the first liquid refrigerant flow path for guiding the refrigerant condensed from the heating and cooling heat exchanger to the auxiliary heat exchanger, and the discharge side of the geothermal heat exchanger and the suction side of the auxiliary heat exchanger are connected during cooling operation, A second liquid refrigerant flow path for guiding the refrigerant condensed from the geothermal heat exchanger to the auxiliary heat exchanger, and the geothermal heat source circulation path and the auxiliary heat exchanger are connected, so that some of the geothermal heat sources before flowing into the geothermal heat exchanger are subsidiary. A geothermal source temperature compensation flow path for guiding the refrigerant passing through the heat exchanger to flow into the geothermal heat exchanger, and a geothermal source pump installed in the geothermal source temperature compensation channel to pump the geothermal heat source to the auxiliary heat exchanger; A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the compressor, a second pressure sensor that measures the condensation pressure of the refrigerant before entering the expansion valve, and a geothermal source before flowing into the geothermal heat exchanger A geothermal source temperature sensor measuring the temperature of and controlling the operation of the four-way valve according to an operation mode including a cooling operation and a heating operation, in the first pressure sensor, the second pressure sensor and the geothermal source temperature sensor And a control unit for controlling the operation of the geothermal source pump according to the measured value, wherein the control unit, during heating operation, the condensation pressure measured by the second pressure sensor The compression ratio, which is equal to or higher than the first preset condensation pressure and is a value obtained by dividing the condensation pressure measured by the second pressure sensor by the evaporation pressure measured by the first pressure sensor, is equal to or greater than the preset compression ratio, and is measured by the geothermal source temperature sensor. When the temperature of one geothermal source is less than the first preset temperature, the geothermal source pump is operated, and during cooling operation, the condensation pressure measured by the second pressure sensor is equal to or higher than the third preset condensation pressure, and the geothermal heat If the temperature of the geothermal source measured by the source temperature sensor is higher than or equal to the second preset temperature, the geothermal source pump is operated, and the condensation measured by the second pressure sensor is performed while the geothermal source pump is operating during the heating operation. When the pressure is less than the second set condensation pressure set lower than the first set condensation pressure, the geothermal source pump is stopped, and the condensation pressure measured by the second pressure sensor while the geothermal source pump is operating during the cooling operation. If it is less than the fourth set condensing pressure set lower than the third set condensing pressure, the geothermal source pump is stopped.

In the present invention, the temperature of the geothermal source can be compensated through heat exchange in the receiver or auxiliary heat exchanger by heat-exchanging some of the geothermal sources before flowing into the geothermal heat exchanger in a receiver or auxiliary heat exchanger, and then flowing into the geothermal heat exchanger. Therefore, there is an advantage of minimizing the underground flow path installed in the ground, and there is an advantage that installation and maintenance costs can be reduced due to the minimization of the underground flow path.

In addition, as the temperature of the geothermal source flowing into the geothermal heat exchanger increases during the heating operation, not only the evaporation efficiency of the refrigerant in the geothermal heat exchanger increases, but also the refrigerant is additionally cooled in the receiver or auxiliary heat exchanger, thereby increasing the supercooling. Due to this, the heating capacity and the coefficient of performance can be improved.

In addition, since the temperature of the geothermal heat source flowing into the geothermal heat exchanger can be lowered during the cooling operation, the condensation efficiency of the refrigerant in the geothermal heat exchanger is increased, and the cooling capacity and the coefficient of performance can be improved due to the increase in subcooling.

In addition, since the condensing pressure that operates the geothermal source pump and the condensation pressure that stops the operation of the geothermal source pump are set to have a difference, it is possible that the geothermal source pump is frequently turned on or off for a short period of time due to minute fluctuations in the condensing pressure. Is prevented, there is an advantage that the geothermal source pump can be operated more stably.

1 is a heating operation of a high-efficiency heat pump system using geothermal heat according to a first embodiment of the present invention, and is a view showing a state in which the geothermal source pump is turned off.
2 is a heating operation of the high-efficiency heat pump system using geothermal heat according to the first embodiment of the present invention, and is a view showing a state in which the geothermal source pump is turned on.
3 is a diagram illustrating a cooling operation of a high-efficiency heat pump system using geothermal heat according to the first embodiment of the present invention, and a state in which the geothermal source pump is turned off.
4 is a diagram illustrating a cooling operation of a high-efficiency heat pump system using geothermal heat according to the first embodiment of the present invention, and a geothermal source pump is turned on.
5 is a heating operation of the high-efficiency heat pump system using geothermal heat according to the second embodiment of the present invention, and is a view showing a state in which the geothermal source pump is turned on.
6 is a diagram illustrating a cooling operation of a high-efficiency heat pump system using geothermal heat according to a second embodiment of the present invention, and a geothermal source pump is turned on.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a heating operation of a high-efficiency heat pump system using geothermal heat according to a first embodiment of the present invention, and is a view showing a state in which the geothermal source pump is turned off.

Referring to FIG. 1, a high-efficiency heat pump system using geothermal heat according to the first embodiment of the present invention includes a compressor 10, a heating and cooling heat exchanger 20, a geothermal heat exchanger 30, an expansion valve 40, and Valve 50, receiver 60, refrigerant circulation passage, first liquid refrigerant passage 110, second liquid refrigerant passage 120, cooling/heating water circulation passage 200, geothermal source circulation passage 300, geothermal heat It includes a source temperature compensation flow path 400, a geothermal source pump 500, and a control unit (not shown).

The compressor 10 compresses the refrigerant circulating through the refrigerant circulation passage.

The cooling/heating heat exchanger 20 is a heat exchanger for exchanging heat between the refrigerant circulating through the refrigerant circulation passage and the cooling/heating water circulating through the cooling/heating water circulation passage 200.

The cooling/heating heat exchanger 20 serves as a condenser for condensing the refrigerant by providing heat to the cooling/heating water by exchanging heat between the refrigerant and cooling/heating water during a heating operation, and an evaporator that evaporates the refrigerant by absorbing the heat of the cooling/heating water during a cooling operation. Plays a role.

The geothermal heat exchanger 30 is a heat exchanger for exchanging heat between a refrigerant circulating through the refrigerant circulation passage and a geothermal heat source circulating through the geothermal source circulation passage 300. Here, the geothermal source is a heat medium that transfers heat while passing through the ground.

The geothermal heat exchanger 30 serves as an evaporator to evaporate the refrigerant by absorbing heat from the geothermal source by exchanging heat between the refrigerant and the geothermal heat source during a heating operation, and heat exchange between the refrigerant and the geothermal source during the cooling operation to transfer heat to the geothermal source. It acts as a condenser that discharges and condenses the refrigerant.

The four-way valve 50 is a valve that switches a flow path of the refrigerant under the control of the controller.

The receiver 60 is a liquid refrigerant tank temporarily storing the refrigerant before flowing into the expansion valve 40.

At least a portion of the geothermal source temperature compensation channel 400 passes through the receiver 60 to heat exchange between the refrigerant stored therein and the geothermal heat source passing through the geothermal source temperature compensation channel 400.

The refrigerant circulation passage connects the compressor 10, the cooling and heating heat exchanger 20, the geothermal heat exchanger 30, the four-way valve 50, and the expansion valve 40, and the compressor 10 It is a channel formed to circulate the refrigerant from

The refrigerant circulation passage is a first refrigerant passage 101 connecting the compressor 10 and the four-way valve 50, and connecting the four-way valve 50 and one entrance of the cooling and heating heat exchanger 20 A second refrigerant passage 102, a third refrigerant passage 103 connected to the other entrance of the cooling and heating heat exchanger 20, and a fourth refrigerant passage connecting the receiver 60 and the expansion valve 40 (104), a fifth refrigerant passage 105 connecting one entrance of the geothermal heat exchanger 30, and a sixth refrigerant connecting the other entrance of the geothermal heat exchanger 30 and the four-way valve 50 A flow path 106, a seventh refrigerant flow passage 107 connecting the four-way valve 50 and the suction side of the compressor 10, and the discharge side of the expansion valve 40 and the fifth refrigerant flow passage 105 And an eighth refrigerant passage 108 connecting the expansion valve 40 and a ninth refrigerant passage 109 connecting the discharge side of the expansion valve 40 and the third refrigerant passage 103.

The eighth refrigerant passage 108 is an expansion valve discharge passage for a heating operation that guides the refrigerant discharged from the expansion valve 40 to the geothermal heat exchanger 30 during a heating operation. The eighth refrigerant passage 108 connects the discharge port of the expansion valve 40 and the fifth refrigerant passage 105.

A first check valve 91 is installed in the eighth refrigerant flow path 108. The first check valve 91 guides the flow of refrigerant in a direction from the expansion valve 40 toward the geothermal heat exchanger 30 during a heating operation, and exits the geothermal heat exchanger 30 during a cooling operation. The refrigerant is prevented from flowing back to the expansion valve 40.

The ninth refrigerant passage 109 is an expansion valve discharge passage for cooling operation that guides the refrigerant discharged from the expansion valve 40 to the cooling and heating heat exchanger 20 during cooling operation. The ninth refrigerant flow path 109 connects between the discharge port of the expansion valve 40 and the third refrigerant flow path 103.

A second check valve 92 is installed in the ninth refrigerant flow path 109. The second check valve 92 guides the flow of refrigerant from the expansion valve 40 toward the cooling/heating heat exchanger 20 during cooling operation, and exits the cooling/heating heat exchanger 20 during heating operation. The refrigerant is prevented from flowing back to the expansion valve 40.

The first liquid refrigerant flow path 110 is connected to the third refrigerant flow path 103.

The first liquid refrigerant passage 110 is a receiver suction passage for a heating operation that guides the refrigerant condensed from the cooling and heating heat exchanger 20 to the receiver 60 during a heating operation.

A third check valve 93 is installed in the first liquid refrigerant flow path 110. The third check valve 93 prevents the refrigerant in the second liquid refrigerant flow path 120 to be described later from flowing back into the first liquid refrigerant flow path 110 during cooling operation.

The second liquid refrigerant flow path 120 is connected to the fifth refrigerant flow path 105.

The second liquid refrigerant passage 120 is a cooling receiver suction passage for guiding the refrigerant condensed from the geothermal heat exchanger 30 to the receiver 60 during a cooling operation.

A fourth check valve 94 is installed in the second liquid refrigerant flow path 120. The fourth check valve 94 prevents the refrigerant in the first liquid refrigerant flow path 110 from flowing back into the second liquid refrigerant flow path 120 during a heating operation.

A solenoid valve 41, a liquid level gauge 42, and a filter dryer 43 are installed in the fourth refrigerant flow path 104.

An accumulator 11 is installed in the seventh liquid refrigerant flow path 107.

The cooling/heating water circulation flow path 200 includes a cooling/heating water inlet flow path 201 through which cooling and heating water from a heat consumer is introduced into the cooling/heating heat exchanger 20, and the cooling/heating water heat exchanged in the cooling/heating heat exchanger 20 It includes a cooling and heating water discharge passage 202 discharged to.

The geothermal source circulation channel 300 is a channel formed to circulate the geothermal heat source by connecting the geothermal heat exchanger 30 and the ground. The geothermal source circulation flow path 300 includes an underground flow path (not shown) installed in the ground, and a geothermal source inflow flow path connected to the underground flow path to guide a geothermal source passing through the underground flow path to the geothermal heat exchanger 30 301 and a geothermal source discharge passage 302 for guiding the geothermal heat source from the geothermal heat exchanger 30 to the underground passage.

The geothermal source temperature compensation channel 400 connects the geothermal source circulation channel 300 and the receiver 60 to transfer some of the geothermal sources before flowing into the geothermal heat exchanger 30 to the receiver. It is a flow path that guides the heat exchange with the refrigerant in 60 to flow into the geothermal heat exchanger 30.

The geothermal source temperature compensation channel 400 includes a first geothermal source temperature compensation channel 401 branched from the geothermal source inflow channel 301 and connected to the receiver 60, and the first geothermal source temperature compensation channel The geothermal source receiver flow path 403 extending from 401 and formed to pass through the interior of the receiver 60, and the geothermal heat source passing through the geothermal source receiver flow path 403 are transferred to the geothermal source inlet flow path 301 It includes a second geothermal source temperature compensation flow path 402 that guides back to ).

The geothermal source pump 500 is a pump installed in the first geothermal source temperature compensation passage 401 to pump a geothermal source before flowing into the geothermal heat exchanger 30 to the receiver 60 . The geothermal source pump 500 is turned on or off according to the control of the controller (not shown).

In addition, the heat pump system includes a plurality of sensors.

A first pressure sensor 71 is installed in the seventh refrigerant flow path 107. The first pressure sensor 71 measures the evaporation pressure P1 of the refrigerant before being sucked into the compressor 10.

A second pressure sensor 72 is installed in the fourth refrigerant flow path 104. The second pressure sensor 72 measures the condensation pressure P2 of the refrigerant before flowing into the expansion valve 40. The second pressure sensor 72 will be described as being installed between the receiver 60 and the filter dryer 43 in the fourth refrigerant flow path 104, for example.

A first temperature sensor 81 is installed in the first refrigerant flow path 101. The first temperature sensor 81 measures the temperature of the refrigerant discharged from the compressor 10.

A second temperature sensor 82 is installed in the seventh refrigerant flow path 107. The second temperature sensor 82 measures the temperature of the refrigerant before being sucked into the compressor 10.

A third temperature sensor 83 is installed in the cooling/heating water inflow passage 201. The third temperature sensor 83 measures the temperature of the heating/cooling water before flowing into the heating/cooling heat exchanger 20.

A fourth temperature sensor 84 is installed in the cooling/heating water discharge passage 202. The fourth temperature sensor 84 measures the temperature of the heating/cooling water heat-exchanged from the heating/cooling heat exchanger 20.

A fifth temperature sensor 85 is installed in the geothermal source inflow passage 301. The fifth temperature sensor 85 is a geothermal source temperature sensor that measures the temperature of the geothermal source before flowing into the geothermal heat exchanger 30. Hereinafter, the fifth temperature sensor 85 is referred to as a geothermal source temperature sensor 85.

A sixth temperature sensor 86 is installed in the geothermal source discharge passage 302. The sixth temperature sensor 86 is a sensor that measures the temperature of a geothermal source generated by heat exchange from the geothermal heat exchanger 30.

The control unit (not shown) controls the operation of the four-way valve 50 according to an operation mode including a cooling operation and a heating operation. In addition, the control unit (not shown) of the geothermal source pump 500 according to the values measured by the first pressure sensor 71, the second pressure sensor 72, and the geothermal source temperature sensor 85. Control the operation.

The operation of the heat pump system according to the first embodiment of the present invention configured as described above will be described as follows.

First, with reference to FIG. 1, a description will be given of a state in which the geothermal source pump is turned off during the heating operation.

During the heating operation, the refrigerant compressed by the compressor 10 is the four-way valve 50, the cooling and heating heat exchanger 20, the receiver 60, the expansion valve 40, and the geothermal heat exchanger 30. And after passing through the four-way valve 50 in order, it is circulated to the compressor 10 again.

In the cooling/heating heat exchanger 20, the refrigerant and the cooling/heating water are heat-exchanged, the refrigerant is condensed, and the cooling/heating water absorbs heat, thereby supplying the heating water to the heat demander. The temperature of the cooling and heating water flowing into the cooling and heating unit inflow passage 201 is about 45°C, and the temperature of the cooling and heating water discharged through the cooling and heating unit discharge passage 202 is about 50°C.

The refrigerant condensed in the cooling/heating heat exchanger 20 flows into the receiver 60 through the first liquid refrigerant flow path 110.

In the geothermal heat exchanger 30, a refrigerant and a geothermal heat source are heat-exchanged, the refrigerant absorbs heat from the geothermal source and evaporates, and the geothermal source radiates heat. The temperature of the geothermal heat source flowing into the geothermal source inflow channel 301 is about 5°C, and the temperature of the geothermal source discharged into the geothermal source discharge channel 302 is about 0°C.

During the heating operation as described above, the controller (not shown) turns off the geothermal source pump 500, but the first pressure sensor 71, the second pressure sensor 72, and the geothermal source temperature sensor When the value measured in (85) reaches a preset condition, the geothermal source pump 500 is turned on.

During the heating operation, the condition is a condition in which the condensation pressure P2 of the refrigerant measured by the second pressure sensor 72 is equal to or higher than the first preset condensation pressure, and the refrigerant measured by the second pressure sensor 72 The condition that the compression ratio, which is a value obtained by dividing the condensation pressure P2 by the evaporation pressure P1 of the refrigerant measured by the first pressure sensor 71, is equal to or greater than a preset compression ratio, and the geothermal heat source measured by the geothermal source temperature sensor 85 And a condition in which the temperature is equal to or less than the first preset temperature.

The first set condensing pressure will be described as an example of about 25 bar.

The set compression ratio is described as an example as about 2.5.

The first set temperature is described as an example as about 20°C.

The control unit (not shown) turns on and operates the geothermal source pump 500 when all three conditions are satisfied during the heating operation.

2 is a heating operation of the high-efficiency heat pump system using geothermal heat according to the first embodiment of the present invention, and is a view showing a state in which the geothermal source pump is turned on.

Referring to FIG. 2, when the geothermal source pump 500 is operated during heating operation, some of the geothermal sources flowing into the geothermal source inflow channel 301 flow into the first geothermal source temperature compensation channel 401. .

The geothermal heat source introduced into the first geothermal source temperature compensation channel 401 passes through the geothermal source receiver flow path 403 and heat-exchanges with the refrigerant inside the receiver 60.

In the receiver 60, the refrigerant loses heat to the geothermal source, and the geothermal source absorbs heat from the refrigerant.

The geothermal source absorbing heat in the receiver 60 flows back into the geothermal source inflow channel 301 through the second geothermal source temperature compensation channel 402.

Therefore, since the geothermal heat source flowing into the geothermal heat exchanger 30 is a mixture of a geothermal heat source absorbing heat from the ground and a geothermal source absorbing heat from the receiver 60, the geothermal heat exchanger 30 The temperature of the geothermal source flowing into the furnace may be higher. That is, the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 may be compensated through heat exchange in the receiver 60.

Since the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 can be further increased, the length of the underground flow path installed in the ground can be reduced, so that installation and maintenance costs can be reduced.

In addition, as the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 increases, heat exchange efficiency in the geothermal heat exchanger 30 increases, and thus a heating capacity and a coefficient of performance may be improved.

In addition, since the refrigerant is additionally cooled in the receiver 60, a heating capacity and a coefficient of performance may be improved due to an increase in supercooling.

On the other hand, while the geothermal source pump 500 is operating, if the condensation pressure P2 measured by the second pressure sensor is less than the second set condensation pressure set lower than the first set condensation pressure, the geothermal source pump ( 500) is stopped.

When the first set condensing pressure is 25 bar, the second set condensing pressure is 24 bar.

Since the first set condensing pressure and the second set condensing pressure are set to have a difference of about 1 bar, the geothermal source pump 500 is frequently turned on or off for a short period of time due to minute fluctuations in the condensing pressure P2. Can be prevented.

For example, in a state where the condensation pressure P2 becomes 25 bar and the geothermal source pump 500 is turned on, the geothermal source pump 500 is not immediately turned off even if the condensation pressure P2 is lowered to 24.9 bar. Does not.

Therefore, the geothermal source pump 500 can be operated more stably.

Meanwhile, the cooling operation will be described as follows.

3 is a diagram illustrating a cooling operation of a high-efficiency heat pump system using geothermal heat according to the first embodiment of the present invention, and a state in which the geothermal source pump is turned off.

3, during cooling operation, the refrigerant compressed by the compressor 10 is the four-way valve 50, the geothermal heat exchanger 30, the receiver 60, the expansion valve 40, the After passing through the cooling/heating heat exchanger 20 and the four-way valve 50 in order, it is circulated to the compressor 10 again.

In the geothermal heat exchanger 30, a refrigerant and a geothermal heat source are heat-exchanged, so that the refrigerant is condensed and the geothermal source absorbs heat. The geothermal heat exchanger 30 serves as a condenser for refrigerant.

The refrigerant condensed in the geothermal heat exchanger 30 flows into the receiver 60 through the second liquid refrigerant flow path 120.

In the cooling/heating heat exchanger 20, the refrigerant and the cooling/heating water are heat-exchanged, the refrigerant is evaporated, and the cooling/heating water is cooled, so that cooling water can be supplied to the heat demander.

During the cooling operation as described above, the controller (not shown) turns off the geothermal source pump 500, but the first pressure sensor 71, the second pressure sensor 72, and the geothermal source temperature sensor When the value measured in (85) reaches a preset condition, the geothermal source pump 500 is turned on.

During the cooling operation, the condition is a condition in which the condensation pressure P2 of the refrigerant measured by the second pressure sensor 72 is equal to or greater than the third preset condensation pressure, and the geothermal source measured by the geothermal source temperature sensor 85 And a condition in which the temperature of is equal to or higher than the second preset temperature.

The third set condensing pressure is set lower than the first and second set condensing pressures. The third set condensing pressure is described as an example as 20 bar.

The second set temperature will be described as an example as about 20°C.

The controller (not shown) turns on and operates the geothermal source pump 500 when both of the above conditions are satisfied during cooling operation.

4 is a diagram illustrating a cooling operation of a high-efficiency heat pump system using geothermal heat according to the first embodiment of the present invention, and a geothermal source pump is turned on.

Referring to FIG. 4, when the geothermal source pump 500 is operated during cooling operation, some of the geothermal sources introduced into the geothermal source inflow channel 301 are introduced into the first geothermal source temperature compensation channel 401. .

The geothermal heat source introduced into the first geothermal source temperature compensation channel 401 passes through the geothermal source receiver flow path 403 and heat-exchanges with the refrigerant inside the receiver 60.

Since the low-temperature refrigerant condensed in the geothermal heat exchanger 30 is temporarily stored in the receiver 60, the geothermal heat source passing through the receiver 60 is further cooled by the low-temperature refrigerant.

The geothermal heat source cooled in the receiver 60 flows back into the geothermal source inflow channel 301 through the second geothermal source temperature compensation channel 402.

Therefore, since the geothermal heat source flowing into the geothermal heat exchanger 30 is a mixture of the geothermal heat source passing through the geothermal flow path and the geothermal heat source cooled in the receiver 60, the geothermal heat exchanger 30 The temperature of the geothermal source is lower than the temperature of the geothermal source passing through the underground flow path.

Since the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 is lowered, the heat exchange rate in the geothermal heat exchanger 30 is improved.

As the heat exchange rate in the geothermal heat exchanger 30 is improved, the degree of supercooling of the refrigerant is increased, so that the cooling capacity and the coefficient of performance may be improved.

In addition, since the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 can be further lowered, the length of the underground flow path installed in the ground can be reduced, so that installation and maintenance costs can be reduced.

On the other hand, while the geothermal source pump 500 is operated during the cooling operation, if the condensation pressure P2 measured by the second pressure sensor is less than the fourth set condensation pressure set lower than the third set condensation pressure, the The operation of the geothermal source pump 500 is stopped.

When the third set condensing pressure is 20 bar, the fourth set condensing pressure is 19 bar.

Since the third set condensing pressure and the fourth set condensing pressure are set to have a difference of about 1 bar, the geothermal source pump 500 is frequently turned on or off for a short period of time due to minute fluctuations in the condensing pressure P2. Can be prevented.

For example, in a state where the condensation pressure P2 becomes 20 bar and the geothermal source pump 500 is turned on, the geothermal source pump 500 is not immediately turned off even if the condensation pressure P2 is lowered to 19.5 bar. Does not.

Therefore, the geothermal source pump 500 can be operated more stably.

Meanwhile, FIG. 5 is a diagram illustrating a heating operation of a high-efficiency heat pump system using geothermal heat according to a second embodiment of the present invention, and a geothermal source pump is turned on. 6 is a diagram illustrating a cooling operation of a high-efficiency heat pump system using geothermal heat according to a second embodiment of the present invention, and a geothermal source pump is turned on.

5 and 6, the heat pump system according to the second embodiment of the present invention differs from the first embodiment in that the auxiliary heat exchanger 600 is used instead of the receiver. Since the operation is similar, it will be described below focusing on different points, and the same reference numerals are used for similar configurations, and detailed description thereof will be omitted.

5, during the heating operation, the controller (not shown) turns off the geothermal source pump 500, but the first pressure sensor 71, the second pressure sensor 72, the geothermal heat When the value measured by the original temperature sensor 85 reaches a preset condition, the geothermal source pump 500 is turned on.

The conditions include a condition in which the condensation pressure P2 of the refrigerant measured by the second pressure sensor 72 is equal to or greater than a first preset condensation pressure, and the condensation pressure P2 of the refrigerant measured by the second pressure sensor 72 ) Divided by the evaporation pressure (P1) of the refrigerant measured by the first pressure sensor 71 is equal to or greater than a preset compression ratio, and the temperature of the geothermal source measured by the geothermal source temperature sensor 85 is preset Includes conditions below the first set temperature.

The first set condensing pressure will be described as an example of about 25 bar.

The set compression ratio is described as an example as about 2.5.

The first set temperature is described as an example as about 20°C.

When all three conditions are satisfied, the control unit (not shown) turns on and operates the geothermal source pump 500.

When the geothermal source pump 500 is operated during the heating operation, some of the geothermal sources flowing into the geothermal source inflow channel 301 flow into the first geothermal source temperature compensation channel 401.

The geothermal heat source introduced into the first geothermal source temperature compensation flow path 401 passes through the auxiliary heat exchanger 600 and is heat-exchanged with the refrigerant inside the auxiliary heat exchanger 600.

In the auxiliary heat exchanger 600, the refrigerant dissipates heat from the geothermal source, and the geothermal source absorbs heat from the refrigerant.

The geothermal heat source absorbing heat in the auxiliary heat exchanger 600 flows back into the geothermal source inflow channel 301 through the second geothermal source temperature compensation channel 402.

Therefore, since the geothermal heat source flowing into the geothermal heat exchanger 30 is a mixture of a geothermal source absorbing heat from the ground and a geothermal source absorbing heat from the auxiliary heat exchanger 600, the geothermal heat exchanger 30 ), the temperature of the geothermal source flowing into it may be higher. That is, the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 may be compensated through heat exchange in the auxiliary heat exchanger 600.

Since the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 can be further increased, the length of the underground flow path installed in the ground can be reduced, so that installation and maintenance costs can be reduced.

In addition, as the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 increases, heat exchange efficiency in the geothermal heat exchanger 30 increases, and thus a heating capacity and a coefficient of performance may be improved.

In addition, since the refrigerant is additionally cooled in the auxiliary heat exchanger 600, a heating capacity and a coefficient of performance may be improved due to an increase in subcooling.

On the other hand, while the geothermal source pump 500 is operated during the heating operation, when the condensation pressure P2 measured by the second pressure sensor is less than the second set condensation pressure set lower than the first set condensation pressure, the The operation of the geothermal source pump 500 is stopped.

When the first set condensing pressure is 25 bar, the second set condensing pressure is 24 bar.

Since the first set condensing pressure and the second set condensing pressure are set to have a difference of about 1 bar, the geothermal source pump 500 is frequently turned on or off for a short period of time due to minute fluctuations in the condensing pressure P2. Can be prevented.

Meanwhile, referring to FIG. 6, during the cooling operation, the controller (not shown) turns off the geothermal source pump 500, but the first pressure sensor 71, the second pressure sensor 72, When the value measured by the geothermal source temperature sensor 85 reaches a preset condition, the geothermal source pump 500 is turned on.

During the cooling operation, the condition is a condition in which the condensation pressure P2 of the refrigerant measured by the second pressure sensor 72 is equal to or greater than the third preset condensation pressure, and the geothermal source measured by the geothermal source temperature sensor 85 And a condition in which the temperature of is equal to or higher than the second preset temperature.

The third set condensing pressure is set lower than the first and second set condensing pressures. The third set condensing pressure is described as an example as 20 bar.

The second set temperature will be described as an example as about 20°C.

The controller (not shown) turns on and operates the geothermal source pump 500 when both of the above conditions are satisfied during cooling operation.

When the geothermal source pump 500 is operated during the cooling operation, some of the geothermal sources flowing into the geothermal source inflow channel 301 flow into the first geothermal source temperature compensation channel 401.

The geothermal heat source introduced into the first geothermal source temperature compensation flow path 401 passes through the auxiliary heat exchanger 600 and is heat-exchanged with the refrigerant inside the auxiliary heat exchanger 600.

Since the low temperature refrigerant condensed in the geothermal heat exchanger 30 is temporarily stored in the auxiliary heat exchanger 600, the geothermal heat source passing through the auxiliary heat exchanger 600 is additionally cooled by the low temperature refrigerant.

The geothermal heat source cooled in the auxiliary heat exchanger 600 flows back into the geothermal source inflow channel 301 through the second geothermal source temperature compensation channel 402.

Therefore, the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 is lower than the temperature of the geothermal heat source flowing from the underground flow path. That is, the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 may be compensated through heat exchange in the auxiliary heat exchanger 600.

Since the temperature of the geothermal heat source flowing into the geothermal heat exchanger 30 is lowered, the heat exchange rate in the geothermal heat exchanger 30 is improved.

As the heat exchange rate in the geothermal heat exchanger 30 is improved, the degree of supercooling of the refrigerant is increased, so that the cooling capacity and the coefficient of performance may be improved.

In addition, since the temperature of the geothermal source flowing into the geothermal heat exchanger 30 can be further lowered, the length of the underground flow path installed in the ground can be minimized, so that installation and maintenance costs can be reduced.

On the other hand, while the geothermal source pump 500 is operated during the cooling operation, if the condensation pressure P2 measured by the second pressure sensor is less than the fourth set condensation pressure set lower than the third set condensation pressure, the The operation of the geothermal source pump 500 is stopped.

When the third set condensing pressure is 20 bar, the fourth set condensing pressure is 19 bar.

Since the third set condensing pressure and the fourth set condensing pressure are set to have a difference of about 1 bar, the geothermal source pump 500 is frequently turned on or off for a short period of time due to minute fluctuations in the condensing pressure P2. Can be prevented.

For example, in a state where the condensation pressure P2 becomes 20 bar and the geothermal source pump 500 is turned on, the geothermal source pump 500 is not immediately turned off even if the condensation pressure P2 is lowered to 19.5 bar. Does not.

Therefore, the geothermal source pump 500 can be operated more stably.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

10: compressor 20: heating and cooling heat exchanger
30: geothermal heat exchanger 40: expansion valve
50: four-way valve 60: receiver
71: first pressure sensor 72: second pressure sensor
85: geothermal source temperature sensor 200: cooling and heating water circulation passage
300: geothermal source circulation flow path 400: geothermal source temperature compensation flow path
401: first geothermal source temperature compensation flow path 402: second geothermal source temperature compensation flow path
500: geothermal source pump 600: auxiliary heat exchanger

Claims (10)

In a heat pump system comprising a compressor, a cooling and heating heat exchanger, a geothermal heat exchanger, an expansion valve, and a four-way valve,
A refrigerant circulation passage configured to circulate the refrigerant from the compressor by connecting the compressor, the cooling/heating heat exchanger, the geothermal heat exchanger, the four-way valve, and the expansion valve,
A cooling/heating water circulation passage through which cooling/heating water circulates by connecting the cooling/heating heat exchanger to a heat demander,
A geothermal source circulation passage through which the geothermal heat source circulates by connecting the geothermal heat exchanger and the ground,
A receiver for temporarily storing the refrigerant before flowing into the expansion valve;
A first liquid refrigerant flow path that connects the discharge side of the cooling/heat exchanger and the suction side of the receiver during heating operation to guide the refrigerant condensed from the cooling/heating heat exchanger to the receiver,
A second liquid refrigerant flow path connecting the discharge side of the geothermal heat exchanger and the suction side of the receiver during cooling operation to guide the refrigerant condensed from the geothermal heat exchanger to the receiver during the cooling operation,
A geothermal source temperature compensation flow path connecting the geothermal source circulation channel and the receiver to guide some of the geothermal heat sources before flowing into the geothermal heat exchanger to exchange heat with the refrigerant in the receiver and then flow into the geothermal heat exchanger;
A geothermal source pump installed in the geothermal source temperature compensation flow path to pump the geothermal source into the receiver,
A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the compressor,
A second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve,
A geothermal source temperature sensor for measuring the temperature of the geothermal source before flowing into the geothermal heat exchanger,
Controls the operation of the four-way valve according to an operation mode including the cooling operation and the heating operation, and the geothermal source pump according to values measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. Includes a control unit for controlling the operation of,
The control unit,
During the heating operation,
The condensation pressure measured by the second pressure sensor is greater than or equal to the first preset condensation pressure,
A compression ratio, which is a value obtained by dividing the condensation pressure measured by the second pressure sensor by the evaporation pressure measured by the first pressure sensor, is equal to or greater than a preset compression ratio,
If the temperature of the geothermal source measured by the geothermal source temperature sensor is less than or equal to the first preset temperature,
A highly efficient geothermal source heat pump system for operating the geothermal source pump. In a heat pump system comprising a compressor, a cooling and heating heat exchanger, a geothermal heat exchanger, an expansion valve, and a four-way valve,
A refrigerant circulation passage configured to circulate the refrigerant from the compressor by connecting the compressor, the cooling/heating heat exchanger, the geothermal heat exchanger, the four-way valve, and the expansion valve,
A cooling/heating water circulation passage through which cooling/heating water circulates by connecting the cooling/heating heat exchanger to a heat demander,
A geothermal source circulation passage through which the geothermal heat source circulates by connecting the geothermal heat exchanger and the ground,
An auxiliary heat exchanger installed on the suction side to the expansion valve,
A first liquid refrigerant flow path connecting the discharge side of the cooling/heating heat exchanger and the suction side of the auxiliary heat exchanger during a heating operation to guide the refrigerant condensed from the cooling/heating heat exchanger to the auxiliary heat exchanger,
A second liquid refrigerant passage connecting the discharge side of the geothermal heat exchanger and the suction side of the auxiliary heat exchanger during cooling operation to guide the refrigerant condensed from the geothermal heat exchanger to the auxiliary heat exchanger during the cooling operation,
A geothermal source temperature compensation flow path connecting the geothermal source circulation channel and the auxiliary heat exchanger to guide some of the geothermal heat sources before flowing into the geothermal heat exchanger to exchange heat with the refrigerant passing through the auxiliary heat exchanger and then flow into the geothermal heat exchanger Wow,
A geothermal source pump installed in the geothermal source temperature compensation flow path and pumping the geothermal source to the auxiliary heat exchanger;
A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the compressor,
A second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve,
A geothermal source temperature sensor for measuring the temperature of the geothermal source before flowing into the geothermal heat exchanger,
Controls the operation of the four-way valve according to an operation mode including the cooling operation and the heating operation, and the geothermal source pump according to values measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. Includes a control unit for controlling the operation of,
The control unit,
During the heating operation,
The condensation pressure measured by the second pressure sensor is greater than or equal to the first preset condensation pressure,
A compression ratio, which is a value obtained by dividing the condensation pressure measured by the second pressure sensor by the evaporation pressure measured by the first pressure sensor, is equal to or greater than a preset compression ratio,
If the temperature of the geothermal source measured by the geothermal source temperature sensor is less than or equal to the first preset temperature,
A highly efficient geothermal source heat pump system for operating the geothermal source pump. In a heat pump system comprising a compressor, a cooling and heating heat exchanger, a geothermal heat exchanger, an expansion valve, and a four-way valve,
A refrigerant circulation passage configured to circulate the refrigerant from the compressor by connecting the compressor, the cooling/heating heat exchanger, the geothermal heat exchanger, the four-way valve, and the expansion valve,
A cooling/heating water circulation passage through which cooling/heating water circulates by connecting the cooling/heating heat exchanger to a heat demander,
A geothermal source circulation passage through which the geothermal heat source circulates by connecting the geothermal heat exchanger and the ground,
A receiver for temporarily storing the refrigerant before flowing into the expansion valve;
A first liquid refrigerant flow path that connects the discharge side of the cooling/heat exchanger and the suction side of the receiver during heating operation to guide the refrigerant condensed from the cooling/heating heat exchanger to the receiver,
A second liquid refrigerant flow path connecting the discharge side of the geothermal heat exchanger and the suction side of the receiver during cooling operation to guide the refrigerant condensed from the geothermal heat exchanger to the receiver during the cooling operation,
A geothermal source temperature compensation flow path connecting the geothermal source circulation channel and the receiver to guide some of the geothermal heat sources before flowing into the geothermal heat exchanger to exchange heat with the refrigerant in the receiver and then flow into the geothermal heat exchanger;
A geothermal source pump installed in the geothermal source temperature compensation flow path to pump the geothermal source into the receiver,
A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the compressor,
A second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve,
A geothermal source temperature sensor for measuring the temperature of the geothermal source before flowing into the geothermal heat exchanger,
Controls the operation of the four-way valve according to an operation mode including the cooling operation and the heating operation, and the geothermal source pump according to values measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. Includes a control unit for controlling the operation of,
The control unit,
During the above cooling operation,
The condensation pressure measured by the second pressure sensor is greater than or equal to the third preset condensation pressure,
If the temperature of the geothermal source measured by the geothermal source temperature sensor is higher than or equal to the second preset temperature,
A highly efficient geothermal source heat pump system for operating the geothermal source pump. The method according to claim 1 or 2,
The control unit,
While the geothermal source pump is operating,
If the condensation pressure measured by the second pressure sensor is less than the second set condensation pressure set lower than the first set condensation pressure,
High-efficiency geothermal source heat pump system for stopping the geothermal source pump. In a heat pump system comprising a compressor, a cooling and heating heat exchanger, a geothermal heat exchanger, an expansion valve, and a four-way valve,
A refrigerant circulation passage configured to circulate the refrigerant from the compressor by connecting the compressor, the cooling/heating heat exchanger, the geothermal heat exchanger, the four-way valve, and the expansion valve,
A cooling/heating water circulation passage through which cooling/heating water circulates by connecting the cooling/heating heat exchanger to a heat demander,
A geothermal source circulation passage through which the geothermal heat source circulates by connecting the geothermal heat exchanger and the ground,
An auxiliary heat exchanger installed on the suction side to the expansion valve,
A first liquid refrigerant flow path connecting the discharge side of the cooling/heating heat exchanger and the suction side of the auxiliary heat exchanger during a heating operation to guide the refrigerant condensed from the cooling/heating heat exchanger to the auxiliary heat exchanger,
A second liquid refrigerant passage connecting the discharge side of the geothermal heat exchanger and the suction side of the auxiliary heat exchanger during cooling operation to guide the refrigerant condensed from the geothermal heat exchanger to the auxiliary heat exchanger during the cooling operation,
A geothermal source temperature compensation flow path connecting the geothermal source circulation channel and the auxiliary heat exchanger to guide some of the geothermal heat sources before flowing into the geothermal heat exchanger to exchange heat with the refrigerant passing through the auxiliary heat exchanger and then flow into the geothermal heat exchanger Wow,
A geothermal source pump installed in the geothermal source temperature compensation flow path and pumping the geothermal source to the auxiliary heat exchanger;
A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the compressor,
A second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve,
A geothermal source temperature sensor for measuring the temperature of the geothermal source before flowing into the geothermal heat exchanger,
Controls the operation of the four-way valve according to an operation mode including the cooling operation and the heating operation, and the geothermal source pump according to values measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. Including a control unit for controlling the operation of,
The control unit,
During the above cooling operation,
The condensation pressure measured by the second pressure sensor is greater than or equal to the third preset condensation pressure,
If the temperature of the geothermal source measured by the geothermal source temperature sensor is higher than or equal to the second preset temperature,
A highly efficient geothermal source heat pump system for operating the geothermal source pump. The method according to claim 3 or 5,
The control unit,
While the geothermal source pump is operating,
If the condensation pressure measured by the second pressure sensor is less than or equal to the fourth set condensation pressure set lower than the third set condensation pressure,
High-efficiency geothermal source heat pump system for stopping the geothermal source pump. The method according to any one of claims 1, 2, 3 or 5,
An expansion valve discharge passage for heating operation connected to the discharge side of the expansion valve and configured to guide the refrigerant discharged from the expansion valve to the geothermal heat exchanger during the heating operation,
A high-efficiency geothermal source heat pump system further comprising a check valve installed in the discharge passage of the expansion valve for heating operation and preventing the refrigerant from flowing back to the expansion valve during the cooling operation. The method according to any one of claims 1, 2, 3 or 5,
An expansion valve discharge passage for cooling operation connected to the discharge side of the expansion valve and configured to guide the refrigerant discharged from the expansion valve to the cooling/heating heat exchanger during the cooling operation,
A high-efficiency geothermal source heat pump system further comprising a check valve installed in the discharge passage of the expansion valve for cooling operation and preventing the refrigerant from flowing back to the expansion valve during the heating operation. In a heat pump system comprising a compressor, a cooling and heating heat exchanger, a geothermal heat exchanger, an expansion valve, and a four-way valve,
A refrigerant circulation passage configured to circulate the refrigerant from the compressor by connecting the compressor, the cooling/heating heat exchanger, the geothermal heat exchanger, the four-way valve, and the expansion valve,
A cooling/heating water circulation passage through which cooling/heating water circulates by connecting the cooling/heating heat exchanger to a heat demander,
A geothermal source circulation passage through which the geothermal heat source circulates by connecting the geothermal heat exchanger and the ground,
A receiver for temporarily storing the refrigerant before flowing into the expansion valve;
A first liquid refrigerant flow path that connects the discharge side of the cooling/heat exchanger and the suction side of the receiver during heating operation to guide the refrigerant condensed from the cooling/heating heat exchanger to the receiver,
A second liquid refrigerant flow path connecting the discharge side of the geothermal heat exchanger and the suction side of the receiver during cooling operation to guide the refrigerant condensed from the geothermal heat exchanger to the receiver during the cooling operation,
A geothermal source temperature compensation flow path connecting the geothermal source circulation channel and the receiver to guide some of the geothermal heat sources before flowing into the geothermal heat exchanger to exchange heat with the refrigerant in the receiver and then flow into the geothermal heat exchanger;
A geothermal source pump installed in the geothermal source temperature compensation flow path to pump the geothermal source into the receiver,
A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the compressor,
A second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve,
A geothermal source temperature sensor for measuring the temperature of the geothermal source before flowing into the geothermal heat exchanger,
Controls the operation of the four-way valve according to an operation mode including the cooling operation and the heating operation, and the geothermal source pump according to values measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. Includes a control unit for controlling the operation of,
The control unit,
During the heating operation, the condensation pressure measured by the second pressure sensor is equal to or greater than the first preset condensation pressure, and is a value obtained by dividing the condensation pressure measured by the second pressure sensor by the evaporation pressure measured by the first pressure sensor. When the compression ratio is greater than or equal to a preset compression ratio and the temperature of the geothermal source measured by the geothermal source temperature sensor is less than or equal to the first preset temperature, the geothermal source pump is operated,
During the cooling operation, if the condensation pressure measured by the second pressure sensor is equal to or higher than a third preset condensing pressure and the temperature of the geothermal source measured by the geothermal source temperature sensor is equal to or higher than the second preset temperature, the geothermal heat Start the one pump,
While the geothermal source pump is operating during the heating operation, if the condensation pressure measured by the second pressure sensor is less than or equal to the second set condensation pressure set lower than the first set condensation pressure, the geothermal source pump is stopped,
High-efficiency geothermal heat stopping the geothermal source pump when the condensation pressure measured by the second pressure sensor is less than the fourth set condensation pressure set lower than the third set condensation pressure while the geothermal source pump is operating during the cooling operation. One heat pump system. In a heat pump system comprising a compressor, a cooling and heating heat exchanger, a geothermal heat exchanger, an expansion valve, and a four-way valve,
A refrigerant circulation passage configured to circulate the refrigerant from the compressor by connecting the compressor, the cooling/heating heat exchanger, the geothermal heat exchanger, the four-way valve, and the expansion valve,
A cooling/heating water circulation passage through which cooling/heating water circulates by connecting the cooling/heating heat exchanger to a heat demander,
A geothermal source circulation passage through which the geothermal heat source circulates by connecting the geothermal heat exchanger and the ground,
An auxiliary heat exchanger installed on the suction side to the expansion valve,
A first liquid refrigerant flow path connecting the discharge side of the cooling/heating heat exchanger and the suction side of the auxiliary heat exchanger during a heating operation to guide the refrigerant condensed from the cooling/heating heat exchanger to the auxiliary heat exchanger,
A second liquid refrigerant passage connecting the discharge side of the geothermal heat exchanger and the suction side of the auxiliary heat exchanger during cooling operation to guide the refrigerant condensed from the geothermal heat exchanger to the auxiliary heat exchanger during the cooling operation,
A geothermal source temperature compensation flow path connecting the geothermal source circulation channel and the auxiliary heat exchanger to guide some of the geothermal heat sources before flowing into the geothermal heat exchanger to exchange heat with the refrigerant passing through the auxiliary heat exchanger and then flow into the geothermal heat exchanger Wow,
A geothermal source pump installed in the geothermal source temperature compensation flow path and pumping the geothermal source to the auxiliary heat exchanger;
A first pressure sensor that measures the evaporation pressure of the refrigerant before flowing into the compressor,
A second pressure sensor that measures the condensation pressure of the refrigerant before flowing into the expansion valve,
A geothermal source temperature sensor for measuring the temperature of the geothermal source before flowing into the geothermal heat exchanger,
Controls the operation of the four-way valve according to an operation mode including the cooling operation and the heating operation, and the geothermal source pump according to values measured by the first pressure sensor, the second pressure sensor, and the geothermal source temperature sensor. Includes a control unit for controlling the operation of,
The control unit,
During the heating operation, the condensation pressure measured by the second pressure sensor is equal to or greater than the first preset condensation pressure, and is a value obtained by dividing the condensation pressure measured by the second pressure sensor by the evaporation pressure measured by the first pressure sensor. When the compression ratio is greater than or equal to a preset compression ratio and the temperature of the geothermal source measured by the geothermal source temperature sensor is less than or equal to the first preset temperature, the geothermal source pump is operated,
During the cooling operation, if the condensation pressure measured by the second pressure sensor is equal to or higher than a third preset condensing pressure and the temperature of the geothermal source measured by the geothermal source temperature sensor is equal to or higher than the second preset temperature, the geothermal heat Start the one pump,
While the geothermal source pump is operating during the heating operation, if the condensation pressure measured by the second pressure sensor is less than or equal to the second set condensation pressure set lower than the first set condensation pressure, the geothermal source pump is stopped,
High-efficiency geothermal heat stopping the geothermal source pump when the condensation pressure measured by the second pressure sensor is less than the fourth set condensation pressure set lower than the third set condensation pressure while the geothermal source pump is operating during the cooling operation. One heat pump system.

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