KR100949888B1 - Geothermal heat pump system - Google Patents

Abstract

PURPOSE: A geothermal heat pump system is provided to improve cooling and heating performance and efficiency by supercooling a refrigerant in an expansion valve. CONSTITUTION: A geothermal heat pump system comprises a first heat exchanger(110), a second heat exchanger(120), a compressor(130), an expansion valve(140), a first bypass line(109), and a third bypass line(168). The first heat exchanger heat-exchanges underground water with a refrigerant. The second heat exchanger heat-exchanges the refrigerant with water. The compressor compresses the low temperature and pressure refrigerant to the high temperature and pressure refrigerant. The first bypass line bypasses the heat-exchanged underground water to a third heat exchanger(150). The third bypass line the heat-exchanged refrigerant to the third heat exchanger.

Description

Geothermal Heat Pump System

The present invention relates to a heat pump system using geothermal heat, and more particularly, a heat exchanger is further provided in the existing geothermal heat pump system to allow heat exchange between groundwater and refrigerant again. It relates to a geothermal heat pump system that can improve the.

In a conventional heat pump system, a refrigerant is changed to high temperature and high pressure through a compressor during a cooling operation, and the refrigerant of high temperature and high pressure passes through an outdoor side heat exchanger to be exchanged with external air through a four-way valve to be changed to low temperature and high pressure. Subsequently, the refrigerant having a low temperature and high pressure passes through an expansion valve and is changed to a low temperature and low pressure to be heat exchanged in an indoor heat exchanger to cool the indoor air and transfer to a compressor to repeat the above cycle.

At the time of heating, the refrigerant passing through the compressor is supplied to the indoor heat exchanger by operating the four-way valve to heat the room, and the refrigerant passing through the indoor heat exchanger is expanded in the reverse order of the flow during the cooling operation and the outdoor heat exchanger. In addition, a hot water heat pump system has been developed that additionally installs a heat exchanger for heating between a compressor connected to a four-way valve and an indoor heat exchanger to exchange heat with a high temperature and high pressure refrigerant with hot water.

That is, in the above-mentioned hot water combined heat pump system, the four-way valve is directly connected to the compressor, and when the refrigerant changed to high temperature and high pressure in the heat pump is cooled and heated, the hot water is selectively heated through the heat exchanger, the outdoor side heat exchanger, and the indoor heat exchanger. .

However, when the hot water stored in the heat exchanger for heating is heated above a predetermined temperature, the refrigerant in the high temperature and high pressure state is not heat exchanged in the low temperature and high pressure state, and thus the indoor cooling efficiency through the indoor side heat exchanger is lowered.

In addition, when the cooling load increases, the ground heat exchange efficiency is lowered when the ground water absorbed heat from the outdoor heat exchanger is transferred to the basement and the heat exchange is performed again. .

In addition, since the refrigerant changed from the compressor to the high temperature and high pressure changes to the low temperature and high pressure primarily through the heat exchanger for heating, it is difficult to expect room heating until the hot water is heated to a predetermined temperature in the heat exchanger. Rather, early in the year, there was a cold wind.

The present invention is to solve the above problems, when the operating load of the system during heating increases by overcooling before condensing the refrigerant condensed in the expansion valve through the control of the valve, to increase the supercooling performance and performance of the system It is to provide a geothermal heat pump system that can improve the efficiency.

In addition, the present invention is to increase the compression efficiency of the compressor by increasing the compression efficiency of the system by reducing the temperature of the ground water by heat exchange between the low-temperature low-pressure refrigerant and high-temperature ground water through the control of the valve when the operating load of the system increases during cooling To provide a geothermal heat pump system that can improve the.

In addition, the present invention is provided with a three-way valve in the refrigerant line and the groundwater line, and the heat exchange between the refrigerant and the groundwater again through a simple operation of the three-way valve, geothermal heat that can improve the performance and efficiency of the system To provide a pump system.

In order to achieve the above object, the present invention is a geothermal heat pump system operating in a cooling mode, the heat exchange of the ground water and the refrigerant circulated along the refrigerant line supplied by the pump and circulated along the groundwater line occurs 1 heat exchanger; A second heat exchanger in which heat exchange between the refrigerant circulated along the refrigerant line and the water supplied along the pipe connected from the outside occurs; A compressor for compressing a low temperature low pressure refrigerant circulated along the refrigerant line between the first heat exchanger and the second heat exchanger into a high temperature high pressure refrigerant; An expansion valve provided between the first heat exchanger and the second heat exchanger to throttle the refrigerant circulated along the refrigerant line at low pressure; A first bypass line connected to the ground water line and bypassing the ground water heat exchanged with the refrigerant in the first heat exchanger to a third heat exchanger; And a third bypass line connected to the refrigerant line to bypass the refrigerant heat-exchanged with water in the second heat exchanger to the third heat exchanger side, wherein the refrigerant heat-exchanged with water in the second heat exchanger is formed in the second heat exchanger. Bypassing the third heat exchanger side along the bypass line to supercool the groundwater bypassed along the first bypass line to recover heat and flow into the compressor side.

Preferably, the first bypass line and the third bypass line are ground water which is opened by the first valve and the third valve to bypass the first bypass line when the cooling load increases, and is bypassed through the third bypass line. Heat exchange can occur between the refrigerants.
In addition, the present invention provides a geothermal heat pump system operating in a heating mode, comprising: a first heat exchanger in which heat exchange between ground water supplied by a pump and circulated along a groundwater line and a refrigerant circulated along a refrigerant line occurs; A second heat exchanger in which heat exchange between the refrigerant circulated along the refrigerant line and the water supplied along the pipe connected from the outside occurs; A compressor for compressing a low temperature low pressure refrigerant circulated along the refrigerant line between the first heat exchanger and the second heat exchanger into a high temperature high pressure refrigerant; An expansion valve provided between the first heat exchanger and the second heat exchanger to throttle the refrigerant circulated along the refrigerant line at low pressure; A first bypass line connected to the ground water line and bypassing the ground water heat exchanged with the refrigerant in the first heat exchanger to a third heat exchanger; And a second bypass line connected to the refrigerant line to bypass the refrigerant exchanged with water in the second heat exchanger to the third heat exchanger, wherein the refrigerant exchanged with water in the second heat exchanger is the first refrigerant. Bypassing the second heat exchanger side along the second bypass line is supercooled by the groundwater bypassed along the first bypass line, characterized in that flowing into the expansion valve side.
Preferably, the first bypass line and the second bypass line are bypassed through the groundwater and the second bypass line which are respectively opened by the first valve and the second valve and bypassed to the first bypass line when the heating load increases. Heat exchange can occur between the refrigerants.

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According to the geothermal heat pump system of the present invention as described above, when the operating load of the system increases during heating, by subcooling before condensing the refrigerant condensed in the expansion valve through the control of the valve, by increasing the subcooling performance of the system and There is an effect that can improve the efficiency.

In addition, the present invention is to increase the compression efficiency of the compressor by increasing the compression efficiency of the system by reducing the temperature of the ground water by heat exchange between the low-temperature low-pressure refrigerant and high-temperature ground water through the control of the valve when the operating load of the system increases during cooling There is an effect to improve.

In addition, the present invention is provided with a three-way valve in the refrigerant line and the ground water line, and the heat exchange between the refrigerant and the ground water again through a simple operation of the three-way valve, the operation is simple and convenient to use, the performance of the system And there is an effect that can improve the efficiency.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it is noted that the same reference numerals are used for the same components even though they are shown in different drawings.

1 is a schematic view showing a geothermal heat pump system according to an embodiment of the present invention, Figure 2 is a schematic view of the geothermal heat pump system cooling according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention 4 is a schematic view of a geothermal heat pump system with improved cooling performance according to the present invention. FIG. 4 is a schematic view of a geothermal heat pump system according to an embodiment of the present invention, and FIG. FIG. 6 is a schematic diagram of a geothermal heat pump system with improved performance, and FIG. 6 is a Ph diagram of a geothermal heat pump system according to an exemplary embodiment of the present invention.

As shown in Figures 1 to 4, the geothermal heat pump system 100 of the present invention is an underground heat exchanger 104, a first heat exchanger 110, a second heat exchanger 120, a compressor 130, The third ground heat exchanger 150 is additionally provided in the existing geothermal heat pump system including the four-way valve 145 and the expansion valve 140, and the ground water circulated in the system when the operating load of the system increases. By bypassing the refrigerant to allow the heat exchange between the ground water and the refrigerant in the third heat exchanger (150), thereby achieving the technical features that can improve the performance and efficiency of the system.

The underground heat exchanger (104) consists of a pipe embedded in the ground, and a pump (102) is provided to circulate the groundwater in the direction of the arrow (A) along the groundwater line (106) extending therefrom.

As the groundwater is circulated along the groundwater line 106 by the pump 102, the underground heat exchanger 104 discharges heat received from the refrigerant from the first heat exchanger 110 to the ground during cooling. In the case of heating, the ground heat absorbed from the ground is transferred from the first heat exchanger 110 to the refrigerant.

At this time, the ground water line 106 connected to the outlet side of the first heat exchanger 110, the ground water having a heat exchange with the refrigerant in the first heat exchanger 110 to bypass the third heat exchanger 150 side One bypass line 109 is provided via the first valve 108.

The first bypass line 109 controls the first valve 108 when the operating load of the system increases, so that the groundwater passing through the first heat exchanger 110 is not directly circulated to the underground heat exchanger 104. Instead, after being moved to the third heat exchanger 150 along the first bypass line 109 to exchange heat with the refrigerant moved along the second bypass line 164 or the third bypass line 168 again, the groundwater Recovered to line 106 to be moved to the underground heat exchanger 104 side.

The first valve 108 serves to block or block the ground water circulated along the groundwater line 106 toward the first bypass line 109, and may be provided as a check valve or a solenoid valve. Preferably, a three-way valve is provided to open or close the first bypass line 109.

Refrigerant heat exchanged with the ground water is circulated along the refrigerant line 160 provided to be circulated between the first heat exchanger 110 and the second heat exchanger (120).

As described above, the refrigerant line 160 provided between the first heat exchanger 110 and the second heat exchanger 120 compresses a low temperature low pressure refrigerant into a high temperature high pressure refrigerant in the same manner as a conventional geothermal heat pump system. 130, an expansion valve 140 for converting the refrigerant in the low temperature and high pressure state into the refrigerant in the low temperature and low pressure state by heat exchange in the first heat exchanger 110 or the second heat exchanger 120, and the compressor 130. Four-way valve 145 is provided for switching the flow direction of the refrigerant is converted into a state of high temperature and high pressure.

That is, the refrigerant circulated along the refrigerant line 160 between the first heat exchanger 110 and the second heat exchanger 120 is converted to a high temperature and high pressure by the compressor 130, and the first heat exchanger 110. Alternatively, after the heat exchange in the second heat exchanger 120, it is converted to a low temperature low pressure by the expansion valve 140 to form a repeated cycle of heat exchange in the second heat exchanger 120 or the first heat exchanger (110). Done.

The refrigerant circulated along the refrigerant line 160 is changed from the geothermal heat of groundwater supplied from the pump 102 when the first heat exchanger 110 is heated by the direction change of the four-way valve 145. It is converted to an evaporator that absorbs heat and, when cooled, to a condenser that releases heat to the geothermal water supplied by the pump 102.

In addition, the second heat exchanger 120 is converted into a condenser that releases heat of the refrigerant supplied from the compressor 130 when the second heat exchanger 120 is heated by the direction change of the refrigerant occurring in the four-way valve 145. Is converted to an evaporator that absorbs external heat.

In this case, the second bypass line 164 and the third bypass line 168 are respectively provided so that the refrigerant circulated along the refrigerant line 160 bypasses and moves to the third heat exchanger 150 when the operating load increases. do.

The second bypass line 164 is connected to the refrigerant line 160 through the second valve 162 on the refrigerant line 160 connecting the expansion valve 140 and the second heat exchanger 120. The refrigerant circulated along the detour to the third heat exchanger 150 side is recovered by the refrigerant line 160 after the heat exchange with the ground water bypassed through the first bypass line 109 in the third heat exchanger 150 again. To be introduced to the expansion valve 140.

In addition, the third bypass line 168 is connected to the refrigerant line 160 on the refrigerant line 160 connecting the compressor 130 and the second heat exchanger 120 via a third valve (! 66). Coolant circulated along the circumferentially bypassed to the third heat exchanger 150 side, the heat exchanged with the ground water bypassed through the first bypass line 109 in the third heat exchanger 150 to the refrigerant line 160 again. It is recovered and introduced to the compressor 130.

The inflow and blocking of the refrigerant into the second bypass line 164 and the third bypass line 168 are controlled by the valves 162 and 166 provided in each bypass line like the first bypass line 109.

That is, like the first valve 108, the second valve 162 and the third valve (! 66) are also provided as three-way valves, so that the geothermal heat pump system 100 of the present invention is used for heating, so that the heating load is reduced. When increasing, the third bypass line 168 is closed by closing the third bypass line 168 so that the refrigerant is not bypassed toward the third bypass line 168 and the second valve 162 is closed to control the second bypass line ( The refrigerant is bypassed to the side 164 to allow heat exchange with the groundwater bypassed through the first bypass line 109 in the third heat exchanger 150.

On the contrary, when the geothermal heat pump system 100 of the present invention is used for cooling, the second bypass by controlling the second valve 162 so as not to bypass the refrigerant to the second bypass line 164 when the cooling load increases. Line 164 is closed and ground water is diverted through the first bypass line 109 from the third heat exchanger 150 by the refrigerant bypass to the third bypass line 168 by controlling the third valve 166. And heat exchange takes place.

As described above, the geothermal heat pump system 100 of the present invention controls the first, second, and third valves 108, 162, and 166 when the operating load increases when the geothermal heat pump system 100 is used for cooling or heating, thereby bypassing the first bypass to the third heat exchanger 150. By allowing heat exchange between the groundwater introduced through the line 109 and the refrigerant introduced through the second bypass line 164 or the third bypass line 168, the performance and efficiency of the system may be improved. .

Meanwhile, although the first, second, and third bypass lines 109, 164, and 168 are provided to bypass one third heat exchanger 150, heat exchange is performed between the groundwater and the refrigerant, but the present invention is not limited thereto. 1 bypass line is provided so as to branch into two lines in the middle, one heat exchanger consisting of a first bypass line and a second bypass line branched third heat exchanger and a branched first bypass line and a third bypass line It may be provided with another heat exchanger.

Thus, when the third heat exchanger is provided with two heat exchangers, as described above, during cooling, the ground water and the refrigerant are closed to the heat exchanger side through which the second bypass line passes, and the third bypass line passes. On the heat exchanger side, the groundwater and the refrigerant are bypassed to allow heat exchange.

On the contrary, during heating, the ground water and the refrigerant are closed to the heat exchanger side through which the third bypass line passes, and the ground water and the refrigerant bypass the side of the heat exchanger through the second bypass line so that heat exchange occurs. do.

In addition, when the third heat exchanger is provided with two heat exchangers, the first bypass line provided on the groundwater line is provided with two bypass lines, each of which constitutes a separate circulation line, and one bypass line has a second bypass line. It may be provided to bypass to the heat exchanger side passing, and another bypass line may be provided to bypass to the heat exchanger side through which the third bypass line passes.

As such, when the third heat exchanger is provided with two heat exchangers, the bypass and blocking of the ground water and the refrigerant are controlled through separate valves provided on the respective lines.

On the other hand, each component used in the geothermal heat pump system 100 of the present invention is separately provided with a control unit (not shown) for controlling the components by an electrical signal.

Figure 2 is a schematic diagram showing the cooling time of the geothermal heat pump system according to an embodiment of the present invention, the arrow indicates the movement direction of the ground water (A) and the refrigerant (C), the first and second indicated by a dotted line The third bypass lines 109, 160 and 164 are closed by the first, second and third valves 108, 162 and 166 to prevent the groundwater and the refrigerant from being bypassed. This is a normal geothermal heat pump by closing the first, second and third bypass lines 109, 160 and 164 through the control of the first, second and third valves 108, 162 and 166 when no operation load occurs during operation of the geothermal heat pump system. To make it available to the system.

As shown in FIG. 2, the geothermal heat pump system 100 of the present invention receives external heat from water supplied along a pipe 122 connected from the outside in a second heat exchanger 120 serving as an evaporator during cooling. The absorbed refrigerant C is closed by the third bypass line 168 by the third valve (! 66) and is directly transferred to the four-way valve 145 through the refrigerant line 160 and then through the compressor 130. It is converted into a high temperature and high pressure refrigerant.

The high temperature and high pressure refrigerant C transferred from the compressor 130 to the four-way valve 145 again through the refrigerant line 160 is supplied to the first heat exchanger 110 which functions as a condenser through the refrigerant line 160. do.

The high temperature and high pressure refrigerant C supplied to the first heat exchanger 110 releases heat through heat exchange with ground water circulated through the groundwater line 106, and the refrigerant that has released heat is a refrigerant line ( After being transferred to the expansion valve 140 through the 160, the refrigerant is converted into the low temperature low pressure state, and the refrigerant converted to the low temperature low pressure state through the expansion valve 140 is transferred to the second heat exchanger 120 functioning as an evaporator. It is supplied to repeat the process of absorbing external heat.

3 is a schematic view showing the cooling time of the geothermal heat pump system with improved cooling performance according to an embodiment of the present invention, and arrows indicate the ground water (A1, A2) and the direction of movement of the refrigerant (C1, C2) The second bypass line 164, which is indicated by dotted lines, indicates that the refrigerant is closed by the second valve 162 so as not to be bypassed.

When the cooling load increases in the geothermal heat pump system 100 operated in the same cycle as in FIG. 2, the control unit (not shown) of the first valve 108 and the third valve (! Opening the first bypass line 109 and the third bypass line 168 through the control to allow the groundwater and the refrigerant to bypass the first bypass line 109 and the third bypass line 168, thereby causing a third heat exchange. Heat exchange occurs in the unit 150.

That is, the low temperature low pressure refrigerant C1 absorbing external heat in the second heat exchanger 120 serving as an evaporator is transferred to the third heat exchanger 150 side through the third bypass line 168 (C2). At this time, the high-temperature underground water A1 heated by the refrigerant in the first heat exchanger 110 serving as a condenser is supplied to the third heat exchanger 150 through the first bypass line 109 (A2) 3 through the heat exchange with the low-temperature low-pressure refrigerant (C2) supplied through the bypass line 168, the high-temperature underground water (A2) is recovered to the underground water line (106) after the temperature is dropped by the refrigerant underground buried underground Transferred to the heat exchanger. Similarly, after the temperature rises slightly by the heat exchange with the ground water C2, the low temperature low pressure refrigerant C2 having undergone heat exchange in the third heat exchanger 150 is recovered to the refrigerant line 160 to open the four-way valve 145. Is conveyed to the compressor.

In this way, when the superheated ground water heated in the first heat exchanger 110 (condenser) is supercooled by using a low temperature low pressure refrigerant from the second heat exchanger 120 (evaporator), the ground is not supplied with other special energy. By lowering the temperature of the water to be transferred to the underground heat exchanger 104 side, the heat exchange efficiency in the underground heat exchanger 104 can be increased, thereby obtaining the effect of using a low capacity underground heat exchanger.

Similarly, when the low temperature low pressure refrigerant from the second heat exchanger 120 (evaporator) raises the temperature of the refrigerant by using a portion of the high temperature ground water heated in the first heat exchanger 110 (condenser), other special energy is obtained. By increasing the temperature of the refrigerant without the supply of the refrigerant to the compressor 130 side, as shown in FIG. 6, the compression efficiency of the compressor 130 can be increased (G2), and thus, the COP of the system can be increased. do.

4 is a schematic view of heating the geothermal heat pump system according to an embodiment of the present invention, the arrow indicates the movement direction of the ground water (A) and the refrigerant (B), the first and second indicated by a dotted line The third bypass lines 109, 160 and 164 are closed by the first, second and third valves 108, 162 and 166 to prevent the groundwater and the refrigerant from being bypassed. This is a normal geothermal heat pump by closing the first, second and third bypass lines 109, 160 and 164 through the control of the first, second and third valves 108, 162 and 166 when no operation load occurs during operation of the geothermal heat pump system. To make it available to the system.

As shown in FIG. 4, the geothermal heat pump system 100 of the present invention is constructed from ground water A circulated along the groundwater line 106 in a first heat exchanger 110 that serves as an evaporator during heating. The refrigerant B having absorbed the geothermal heat is transferred to the four-way valve 145 and then converted into a high temperature and high pressure refrigerant through the compressor 130.

In the high temperature and high pressure refrigerant C transferred from the compressor 130 to the four-way valve 145 through the refrigerant line 160, the third bypass line 168 is closed by the third valve 166 so that the refrigerant line Directly through the 160 is supplied to the second heat exchanger 120 to function as a condenser.

The high temperature and high pressure refrigerant B supplied to the second heat exchanger 120 releases heat through heat exchange with water circulated through the pipe 122 connected from the outside, and the refrigerant B that has released heat is The second bypass line 164 is closed by the second valve 162 and immediately transferred to the expansion valve 140 through the refrigerant line 160, and then converted into a refrigerant having a low temperature and low pressure, and the expansion valve 140 The refrigerant converted to the low temperature low pressure state is supplied to the first heat exchanger 110 functioning as an evaporator to repeat the process of absorbing the geothermal heat supplied by the ground water (A).

5 is a schematic view of the heating of the geothermal heat pump system with improved heating performance according to an embodiment of the present invention, the arrow indicates the movement direction of the ground water (A1, A2) and the refrigerant (B1, B2) The third bypass line 168, which is indicated by a dotted line, indicates that the refrigerant is closed by bypassing the third valve! 66.

When the heating load is increased in the geothermal heat pump system 100 that was operated in the cycle as shown in FIG. 4, the control of the first valve 108 and the second valve 162 in the control unit (not shown) as shown in FIG. 5. By opening the first bypass line 109 and the second bypass line 164 through the groundwater and refrigerant to bypass through the first bypass line 109 and the second bypass line 164, the third heat exchanger Heat exchange occurs at 150.

That is, the low-temperature underground water A1 cooled by the refrigerant in the first heat exchanger 110 serving as the evaporator is transferred to the third heat exchanger 150 through the first bypass line 109. (A2) At this time, the low temperature high pressure refrigerant B2 supplied through the second bypass line 164 is cooled by the low-temperature ground water A2 supplied through the first bypass line 109, and then the refrigerant line 160. Recovered to and is transferred to the expansion valve 140.

As such, when the low-temperature refrigerant cooled in the second heat exchanger 120 (condenser) is supercooled using low-temperature ground water from the first heat exchanger 110 (evaporator), the refrigerant is supplied without any other special energy. By lowering the temperature to transfer to the expansion valve 140 side as shown in Figure 6 it is possible to increase the supercooling (G1) to improve the heating performance.

Although preferred embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to such specific structures. Those skilled in the art will be able to variously modify or change the embodiments of the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. However, it will be apparent in advance that modifications or design variations of such a simple embodiment are all within the scope of the present invention.

1 is a schematic view showing a geothermal heat pump system according to an embodiment of the present invention.

Figure 2 is a schematic diagram of the cooling of the geothermal heat pump system according to an embodiment of the present invention.

Figure 3 is a schematic view of the cooling time of the geothermal heat pump system with improved cooling performance according to an embodiment of the present invention.

Figure 4 is a schematic diagram during heating of the geothermal heat pump system according to an embodiment of the present invention.

5 is a schematic view of the heating of the geothermal heat pump system with improved heating performance according to an embodiment of the present invention.

6 is a P-h diagram of a geothermal heat pump system according to an embodiment of the present invention.

-Explanation of symbols for the main parts of the drawings.

100: geothermal heat pump system 102: pump

104: underground heat exchanger 106: underground water line

108: first valve 109: first bypass line

110: first heat exchanger 120: second heat exchanger

122: water supply line 130: compressor

140: expansion valve 145: 4-way valve

150: third heat exchanger 160: refrigerant line

162: second valve 164: second bypass line

166: third valve 168: third bypass line

Claims (7)

In a geothermal heat pump system operated in a cooling mode, A first heat exchanger in which heat exchange between the ground water supplied by the pump and circulated along the ground water line and the refrigerant circulated along the refrigerant line occurs; A second heat exchanger in which heat exchange between the refrigerant circulated along the refrigerant line and the water supplied along the pipe connected from the outside occurs; A compressor for compressing a low temperature low pressure refrigerant circulated along the refrigerant line between the first heat exchanger and the second heat exchanger into a high temperature high pressure refrigerant; An expansion valve provided between the first heat exchanger and the second heat exchanger to throttle the refrigerant circulated along the refrigerant line at low pressure; A first bypass line connected to the ground water line and bypassing the ground water heat exchanged with the refrigerant in the first heat exchanger to a third heat exchanger; And And a third bypass line connected to the refrigerant line to bypass the refrigerant exchanged with water in the second heat exchanger to the third heat exchanger. The refrigerant heat-exchanged with the water in the second heat exchanger bypasses the third heat exchanger side along the third bypass line to overcool the groundwater bypassed along the first bypass line to recover heat, and then flows into the compressor. Geothermal heat pump system, characterized in that. In a geothermal heat pump system operating in a heating mode, A first heat exchanger in which heat exchange between the ground water supplied by the pump and circulated along the ground water line and the refrigerant circulated along the refrigerant line occurs; A second heat exchanger in which heat exchange between the refrigerant circulated along the refrigerant line and the water supplied along the pipe connected from the outside occurs; A compressor for compressing a low temperature low pressure refrigerant circulated along the refrigerant line between the first heat exchanger and the second heat exchanger into a high temperature high pressure refrigerant; An expansion valve provided between the first heat exchanger and the second heat exchanger to throttle the refrigerant circulated along the refrigerant line at low pressure; A first bypass line connected to the ground water line and bypassing the ground water heat exchanged with the refrigerant in the first heat exchanger to a third heat exchanger; And And a second bypass line connected to the refrigerant line to bypass the refrigerant exchanged with water in the second heat exchanger to the third heat exchanger. The refrigerant heat-exchanged with the water in the second heat exchanger is bypassed to the third heat exchanger side along the second bypass line and overcooled by the groundwater bypassed along the first bypass line to flow into the expansion valve side. Geothermal heat pump system. delete delete According to claim 2, wherein the first bypass line and the second bypass line through the groundwater and the second bypass line is opened by the first valve and the second valve, respectively, when the heating load increases to bypass the first bypass line Geothermal heat pump system, characterized in that heat exchange occurs between the bypassed refrigerant. According to claim 1, wherein the first bypass line and the third bypass line through the ground water and the third bypass line is opened by the first valve and the third valve, respectively, when the cooling load increases to bypass the first bypass line Geothermal heat pump system, characterized in that heat exchange occurs between the bypassed refrigerant. delete

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