KR102235456B1 - Heat-Pump System - Google Patents

Abstract

The present invention provides a geothermal heat pump system capable of geothermal energy restoration, which comprises: a first line having a first pump to supply each water of a heat source from a geothermal heat exchanging unit to first to fourth heat pumps; a second line collecting the water of the heat source of which heat is exchanged in the first to fourth heat pumps to be discharged to the geothermal heat exchanging unit; and a third line branched on the second line to be connected to the first line and supplying the partial water of the heat source discharged from at least one heat pump among the first to third heat pumps to the fourth heat pump.

Description

Geothermal heat pump system capable of restoring geothermal energy in the ground {Heat-Pump System}

The present invention relates to a geothermal heat pump system capable of restoring geothermal energy in the ground, and relates to a geothermal heat pump system capable of restoring geothermal energy in the ground by exchanging a heat medium to be supplied to a heat pump such as geothermal heat, waste heat source, and water heat source.

In general, household and industrial energy sources use fossil fuels such as petroleum or natural gas or nuclear fuel to produce energy. These energy sources not only pollute the environment including water and soil due to various pollutants generated in the combustion process, but also have a limit in reserves, so that alternative energy development is actively progressing.

Among these alternative energies, it is in the spotlight as green energy, and research on wind power, solar heat, geothermal heat, etc., which have infinite energy sources, is continuing.These energy sources can obtain energy with little impact on air pollution and climate change. While it has an advantage, it has a disadvantage of very low energy density.

In particular, in order to obtain energy using wind power and solar heat, a large area must be secured along with the limitation of the installation location, and these devices have a small energy production capacity per unit device and require a lot of cost for installation and maintenance.

However, geothermal heat, a source of alternative energy, is sometimes applied to air conditioners that provide cooling and heating using geothermal heat distributed in a certain range of the ground. It is known that energy savings of up to 40% or more can be saved compared to the device, and energy generation costs of 40 to 70% can be reduced. Such a heat exchange device using geothermal heat enables stable cooling/heating and hot water operation within the year by using geothermal heat maintained at about 10 to 20°C throughout the year through an underground heat exchanger buried at a certain depth.

However, since the heat exchange device using geothermal heat increases the stress of the underground heat source during continuous operation for a long period of time, a problem has been pointed out that a required amount of heat cannot be continuously supplied from the underground heat source.

The present invention is to solve such a problem, and more specifically, by providing at least two heat pumps, the stress of the underground heat source is reduced through the heat source water discharged to the ground heat source by accommodating cooling and heating or cooling and hot water operation with each other. Its purpose is to provide a geothermal heat pump system capable of restoring non-accumulative geothermal energy.

The present invention for accomplishing the above object is a first line provided with a first pump for supplying heat source water to each of the first heat pump to the fourth heat pump direction from the underground heat exchanger; A second line for collecting heat source water heat-exchanged by the first to fourth heat pumps and discharging it to the underground heat exchanger; And a third branched on the second line and connected to the first line, and supplying some of the heat source water discharged from at least one of the first heat pump to the third heat pump to the fourth heat pump. It provides a geothermal heat pump system capable of restoring geothermal energy in the ground, comprising: a line.

The first line includes lines 1-1 to 1-4 respectively connecting the first heat pump to the fourth heat pump from the underground heat exchange unit, and the second line includes each of the first heat pumps. It may include lines 2-1 to 2-4 connecting the underground heat exchanger from the pump to the fourth heat pump.

The third line may be branched from the line 2-3 and connected to the line 1-4, and a first three-way valve may be provided at a portion where the third line and the line 1-4 intersect.

The line 1-4 may include a second pump disposed between the first three-way valve and the fourth heat pump to compensate for the pressure of the heat source water to be supplied to the fourth heat pump.

The third line may connect a first three-way valve provided at a portion branched from the line 2-3 and a second three-way valve provided at a portion where the first three-way valve and the line 1-4 intersect. .

The third line may include a second pump disposed between the first three-way valve and the second three-way valve to compensate for the pressure of the heat source water to be supplied to the fourth heat pump.

The third line is a third line connecting a first three-way valve provided in a portion branched from the line 2-3 and a second three-way valve provided in a portion where the first three-way valve and the line 1-4 intersect. Connecting line 3-1, a third three-way valve provided at a portion branched from the line 2-1, and a fourth three-way valve provided at a portion where the third three-way valve and line 2-1 intersect. It may include a 3-2 line.

The 3-1 line and the 3-2 line may each include a second pump for compensating the pressure of the heat source water to be supplied to the second heat pump and the fourth heat pump.

The geothermal heat pump system capable of restoring underground geothermal energy further includes a first load-side heat exchange unit and a second load-side heat exchange unit connected to the first to fourth heat pumps, and the first to fourth heat pumps And a first refrigerant line to a fourth refrigerant line selectively transferring refrigerant between the first load-side heat exchange unit or the second load-side heat exchange unit.

The geothermal heat pump system capable of restoring geothermal energy from the ground may further include a fifth refrigerant line connecting the second refrigerant line and the fourth refrigerant line.

The second refrigerant line includes a fifth three-way valve provided at a portion crossing the fifth refrigerant line, and the fourth refrigerant line selects and supplies a refrigerant to the first load side heat exchange unit or the second load side heat exchange unit. It may include a six-way valve.

When the first heat pump and the third heat pump are in cooling operation through the first load-side heat exchanger, high-temperature heat source water is supplied through the 3-1 line and the 3-2 line, respectively, the second heat pump and the fourth heat pump. It is supplied to a heat pump, and through the second heat pump and the fourth heat pump, the second load-side heat exchanger may supply hot water.

The heat source water discharged from the second heat pump and the fourth heat pump may be lower in temperature than the heat source water provided from the first heat pump and the third heat pump.

The underground heat exchange unit may recover energy of the underground heat source through the heat source water discharged from the fourth heat pump or the second heat pump and the fourth heat pump.

The first to fourth heat pumps may be operated simultaneously in a cooling or heating mode, or at least one or more may be individually operated in different modes.

According to the geothermal heat pump system capable of restoring geothermal energy in the ground according to the present invention,

First, when any one of the first to fourth heat pumps is operated for heating (or hot water supply), some of the heat source water discharged from the remaining heat pumps is supplied to any one of the heat pumps, thereby reducing the stress of the underground heat source. Can at least partially recover,

Second, when the first heat pump and the third heat pump are operated for cooling, and the second and fourth heat pumps are operated for heating (or hot water supply) (1:1 correspondence), the second and fourth heat pumps As the temperature of the heat source water discharged from is relatively lowered and supplied to the underground heat exchanger, all the stress of the underground heat source can be recovered.

Third, since the stress of the underground heat source is restored, the temperature of the heat source water to be supplied to the heat pump for cooling operation can be lowered, thereby improving the COP of the heat pump receiving the heat source water from the underground heat exchange unit.

Fourth, since the first heat pump to the fourth heat pump can be operated simultaneously or individually in a simultaneous cooling or heating mode, there is no need for a separate hot water heat pump,

Fifth, it is possible to compensate the pressure of the heat source water to be supplied to the heat pump for heating (or hot water supply) operation through the second pump, so that the heat pump for heating operation is effective in preventing a safety accident due to insufficient flow rate.

1 is a reference diagram showing a state in which an underground heat exchanger of the present invention is buried.
2 is a reference diagram schematically showing a geothermal heat pump system according to a first embodiment of the present invention.
3 is a reference diagram schematically showing a geothermal heat pump system according to a second embodiment of the present invention.
4 is a reference diagram schematically showing a geothermal heat pump system according to a third embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. It should be noted that, in the accompanying drawings, the same reference number is used as much as possible when indicating the same configuration in other drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, certain features shown in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

1 is a reference diagram showing a state in which an underground heat exchanger of the present invention is buried, and FIG. 2 is a reference diagram schematically showing a geothermal heat pump system according to a first embodiment of the present invention.

The buried pipe 10 installed in the ground is buried in the first soil layer 11, and the second soil layer 12 is stacked to have a set height on the top surface of the first soil layer 11. At this time, the buried pipe 10 is disposed inside the second soil layer 12, and the third soil layer 13 is stacked thereon. The third soil layer 13 may be a road layer such as concrete or asphalt. Of course, the first soil layer 11 to the third soil layer 13 may be omitted or further added depending on the depth or position of the buried pipe 10. For example, pipe protection sand or the like may be applied to the first soil layer 11 to the third soil layer 13. Hereinafter, the buried pipe 10 will be described as an example in which the underground heat exchanger is buried.

The geothermal heat pump system 100, 200, and 300 capable of restoring geothermal energy according to an embodiment of the present invention uses geothermal heat as a heat source, and the heat source water heat-exchanged from the underground heat exchange unit 10 is the first heat pump (1HP) to the first heat pump (1HP). It may be configured to circulate 4 heat pumps (4HP).

This geothermal heat pump system provides cooling and heating or hot water supply (hot water) to the first load side heat exchange unit (1HE) and the second load side heat exchange unit (2HE) through a heat medium that circulates the first heat pump (1HP) to the fourth heat pump (4HP). ) Can be optionally provided.

The first to fourth heat pumps 1HP to 4HP may be operated simultaneously in a cooling or heating (including hot water supply) mode, and at least one of the heat pumps may be individually operated in different modes. For example, the first heat pump 1HP to the third heat pump 3HP may be operated in a cooling mode, and the fourth heat pump 4HP may be operated in a hot water supply mode.

Here, the first heat pump (1HP) to the fourth heat pump (4HP) indirectly exchange heat between the heat source water supplied from the ground and the heat medium supplied from the load side heat exchange units (1HE, 2HE), so that the heat medium from the heat source water is relatively high. Alternatively, cooling, heating, and hot water may be provided to the load-side heat exchanger by receiving low-temperature thermal energy.

The heat source water supplied from the ground can be ground water, and the heat medium circulating between the heat pump and the load-side heat exchanger is selectively selected from water, air, or refrigerant (R-22, R-134a or R-410, etc.). Can be applied. Hereinafter, the heat source water is groundwater, and a heat medium is applied as a refrigerant as an example.

The heat exchange structure of these heat pumps (1HP~4HP) continuously compresses, condenses, and expands the refrigerant during cooling operation, and allows the load-side heat exchanger (1HE, 2HE) to evaporate the refrigerant in the room to cool it through a general refrigeration cycle. This can be done. In addition, during the heating operation, the load-side heat exchanger may perform general heating or hot water supply through condensation of the refrigerant indoors through the reverse cycle of the refrigeration cycle.

That is, during the cooling operation, the refrigerant circulates in the order of a compressor, a four-way valve, a heat-source side heat exchanger, an expansion valve, a load-side heat exchanger, a four-way valve, and a compressor, so that cooling can be performed using a low-temperature refrigerant in the load-side heat exchanger. In addition, during the heating operation, the refrigerant circulates in the order of the compressor, the four-way valve, the load-side heat exchanger, the expansion valve, the heat-source-side heat exchanger, the four-way valve, and the compressor 20, and heating or hot water supply through the high-temperature refrigerant in the load-side heat exchanger This can be done. Therefore, the heat exchanger on the heat source side and the heat exchanger on the load side may serve as evaporators or condensers, respectively, depending on cooling and heating operations.

At this time, the heat source water is heat-exchanged with the heat source from the ground, which may be achieved through the ground heat exchange unit 10. Of course, it is also possible to supply a heat source through groundwater supplied from the ground, water supplied from waterworks, rivers, and seawater. In the underground heat exchanger 10, a plurality of'U' shaped tubes are buried at a depth set in the ground, and the heat source water absorbing the heat source (thermal energy) of the geothermal heat through the underground heat exchanger 10 is supplied to the heat pump. I can. The underground heat exchanger 10 is preferably installed at a depth at which the annual average temperature is maintained constant in the underground, and can maintain a temperature range of about 13 to 18°C. Therefore, since the temperature difference between geothermal heat and geothermal heat widens significantly in summer and winter based on domestic standards, by utilizing such a large temperature difference, it is possible to provide cooling and heating or hot water supply at low cost through the energy of the heat source in the ground.

The geothermal heat pump system 100 capable of restoring geothermal energy in the ground according to the first embodiment of the present invention includes an underground heat exchange unit 10, a first heat pump (1HP) to a fourth heat pump (4HP), and a first load side heat exchanger. It may include a part 1HE, a second load-side heat exchange part 2HE, a first line 110 to a third line 130 and a refrigerant line 140 connecting them to each other.

First, the first line 110 is connected to supply heat source water from the underground heat exchange unit 10 to the first heat pump (1HP) to the fourth heat pump (4HP). A first pump 1P providing a supply pressure of heat source water may be provided on the first line 110. Therefore, the first line 110 transfers heat source water in a state in which heat source water is heat-exchanged (having energy) in the ground through the underground heat exchange unit 10, from the first heat pump (1HP) to the fourth heat pump (4HP). To be supplied. The first line 110 includes a 1-1 line 111 to a 1-4 line 114 connecting each of the four heat pumps from the underground heat exchange unit 10. Here, the 1-1 line 111 to the 1-4 line 114 may be overlapped or merged in some sections.

The second line 120 is connected to collect and discharge heat source water for which heat exchange has been completed, discharged from the first heat pump 1HP to the fourth heat pump 4HP, to the underground heat exchange unit 10. The second line 120 is a line for discharging heat source water as opposed to the first line 110 supplying heat source water. The heat source water discharged through the second line 120 is discharged in a state in which heat source water is heat-exchanged from each heat pump (energy is consumed). The second line 120 includes 2-1 lines 121 to 2-4 lines 124 connecting the underground heat exchanger from each heat pump. Here, the 2-1 line 121 to the 2-4 line 124 may be overlapped or merged in some sections.

The third line 130 is branched on the second line 120 and is connected to at least one of the first lines 110 to be connected to any one of the first heat pump 1HP to the third heat pump 3HP. It is connected to supply the heat source water discharged from the fourth heat pump (4HP). For example, the third line 130 may supply the heat source water that has been heat-exchanged discharged from the third heat pump 3HP back to the fourth heat pump 4HP. In addition, the heat source water discharged from the first heat pump 1HP and the second heat pump 2HP may be discharged to the underground heat exchange unit 10 through the second line 120. The heat source water supplied to the fourth heat pump 2HP through the third line 130 may have a higher temperature than the heat source water supplied through the first line 110 when the third heat pump 1HP is cooled. I can. The third line 130 may be provided with a first three-way valve 1V at a portion intersecting the first to fourth lines 114. Therefore, the low-temperature heat source water from the underground heat exchanger 10 through the line 1-4 114 flows into the fourth heat pump 4HP according to the opening and closing direction of the first three-way valve 1V, or the third heat The high-temperature heat source water discharged from the pump 3HP may flow into the fourth heat pump 4HP through the third line 130. The description of the heat source water as high temperature and low temperature can be understood as a relative concept to indicate the state before or after heat exchange. When the heat source water discharged from the third heat pump 3HP flows into the fourth heat pump 4HP, the 1-4 line 114 is provided with a second pump 2P for compensating the pressure of the heat source water. I can. The second pump 2P may be stopped when the heat source water is supplied from the underground heat exchange unit 10 to the fourth heat pump 4HP through the 1-4 line 114.

The first heat pump (1HP) to the fourth heat pump (4HP) and the first load-side heat exchange part (1HE) to the second load-side heat exchange part (2HE) are respectively a first refrigerant line 141 to a fourth refrigerant line 144 It is connected through. Each refrigerant line may also be overlapped or merged in a portion adjacent to each load-side heat exchanger. The first to fourth refrigerant lines 141 to 144 may selectively connect the first load-side heat exchange part 1HE and the second load-side heat exchange part 2HE. For example, the fourth refrigerant line 144 may connect the first load side heat exchange unit 1HE or the second load side heat exchange unit 2HE from the fourth heat pump 4HP. In addition, a second three-way valve 2V may be provided at a portion where the fourth refrigerant line 144 diverges into the first load-side heat exchange part 1HE and the second load-side heat exchange part 2HE, respectively. The second three-way valve 2V may be selectively opened and closed in the direction of the first load side heat exchange unit 1HE or the second load side heat exchange unit 2HE according to the cooling or heating (hot water) operation of the fourth heat pump 4HP. .

In the geothermal heat pump system 100 capable of restoring geothermal energy in the ground according to the first embodiment of the present invention, some heat source water is supplied to a heat pump for hot water supply (eg, a fourth heat pump) in a structure equipped with a plurality of heat pumps. , Through the heat source water discharged from the heat pump for hot water supply, the stress of the underground heat source of the underground heat exchange unit may be at least partially recovered. In addition, it is possible to lower the temperature of the heat source water to be supplied to the cooling heat pumps (e.g., the first heat pump to the third heat pump) except for the heat pump for hot water supply. There is an effect that can improve.

3 is a reference diagram schematically showing a geothermal heat pump system according to a second embodiment of the present invention.

Referring to FIG. 3, a geothermal heat pump system 200 capable of restoring geothermal energy according to a second embodiment of the present invention has a difference in a connection structure of a third line compared to the first embodiment. Hereinafter, the same reference numerals as the above-described reference numerals denote the same elements.

A third line 230 is provided between the line 2-3 123 of the third heat pump 3HP and the line 1-4 114 of the fourth heat pump 4HP.

The third line 230 is a first three-way valve (1V) provided at one end branched from the 2-3 line 123, and the line 1-4 114 and the third line 230 crossing. Connect the second three-way valve (2V) provided at the other end.

In the geothermal heat pump system 200 capable of restoring underground geothermal energy according to the second embodiment of the present invention, only the heat source water discharged from the third heat pump 3HP is supplied to the fourth heat pump 4HP, or Heat source water may be supplied to the fourth heat pump 4HP through the 4 line 114. That is, in the first embodiment, some of the heat source water discharged from the first to third heat pumps may be resupplied to the fourth heat pump, but in the second embodiment, the third heat pump 3HP and the fourth The heat pump (4HP) can resupply heat source water on a one-to-one basis. Therefore, the heat source water discharged from the first heat pump (1HP) and the second heat pump (2HP) is discharged to the underground heat exchange unit 10 through the 2-1 line 121 and the 2-2 line 122, respectively. do. In addition, a second pump 2P for compensating the pressure of the heat source water discharged from the third heat pump 3HP may be provided on the third line 230.

In the structure of the geothermal heat pump system 200 capable of restoring underground geothermal energy according to the second embodiment of the present invention, when the third heat pump 3HP is operated for cooling and hot water operation of the fourth heat pump 4HP is required Since the first three-way valve 1V is opened in the direction of the third line 230, it is possible to reduce a reduction in COP due to a change in thermal energy of the heat source water on the third line 230. That is, in the first embodiment, since the heat source water discharged from the first heat pump to the third heat pump is combined and some of the heat source water is supplied to the fourth heat pump, more heat energy loss may occur in the process of resupplying the heat source water. , In the second embodiment, the heat source water discharged from the third heat pump 3HP can be directly supplied to the fourth heat pump 4HP, so that the heat source water resupply process is shortened, thereby reducing heat energy loss. . In addition, the third line 230 has the advantage of being able to apply the second pump 2P having a smaller capacity than the second pump according to the first embodiment.

The first heat pump (1HP) to the fourth heat pump (4HP) and the first load-side heat exchange part (1HE) to the second load-side heat exchange part (2HE) are respectively a first refrigerant line 141 to a fourth refrigerant line 144 It is connected through. Each refrigerant line may also be overlapped or merged in a portion adjacent to each load-side heat exchanger. The first to fourth refrigerant lines 141 to 144 may selectively connect the first load-side heat exchange part 1HE and the second load-side heat exchange part 2HE. For example, the fourth refrigerant line 144 may connect the first load side heat exchange unit 1HE or the second load side heat exchange unit 2HE from the fourth heat pump 4HP. In addition, a third three-way valve 3V may be provided at a portion where the fourth refrigerant line 144 diverges into the first load-side heat exchange part 1HE and the second load-side heat exchange part 2HE, respectively. The third three-way valve 3V may be selectively opened and closed in the direction of the first load side heat exchange unit 1HE or the second load side heat exchange unit 2HE according to the cooling or heating (hot water) operation of the fourth heat pump 4HP. .

4 is a reference diagram schematically showing a geothermal heat pump system according to a third embodiment of the present invention.

The geothermal heat pump system 300 capable of restoring geothermal energy in the ground according to the third embodiment of the present invention includes a first three-way valve (1V) provided in a branched portion from the 2-3 line 123, and a first three-way Branched from the 3-1 line 331 and the 2-1 line 121 connecting the second three-way valve 2V provided at the intersection of the valve 1V and the 1-4 line 114 A third connecting the third three-way valve (3V) provided in the formed portion and the fourth three-way valve (4V) provided at the intersection of the third three-way valve (3V) and the line 2-1 (121). It includes two lines 332. That is, the first heat pump (1HP) is paired with the second heat pump (2HP), and the third heat pump (3HP) is paired with the fourth heat pump (4HP) to simultaneously operate in a cooling or heating mode, or Alternatively, at least one of the first heat pump 1HP to the fourth heat pump 4HP may perform individual operation in different modes.

In other words, in the geothermal heat pump system 300 capable of restoring geothermal energy in the ground according to the third embodiment of the present invention, the first heat pump (1HP) to the fourth heat pump (4HP) responds 1:1 to cooling and hot water supply. Can be driven by Energy efficiency can be maximized where cooling and hot water supply are required at the same time, and there is an effect of minimizing maintenance costs. In this embodiment, four heat pumps are driven as an example, but it is applicable if at least two or more heat pumps capable of 1:1 correspondence are installed.

In addition, the third line 331, 332 is disposed adjacent to the first heat pump (1HP) and the second heat pump (2HP), the 3-1 line 331, the third heat pump (3HP) and The 3-2 line 332 may be disposed adjacent to the fourth heat pump 4HP. In addition, in the 3-1 line 331 and the 3-2 line 332, a second pump 2P compensating the pressure of the heat source water to be supplied to the second heat pump 2HP or the fourth heat pump 4HP. ) May be provided.

The first to fourth heat pumps 1HP to 4HP are connected to the first load-side heat exchange part 1HE and the second load-side heat exchange part 2HE. At this time, the first to the first refrigerant lines 341 to the fourth heat pump (4HP) to transfer the refrigerant between the first heat pump (1HP) to the fourth heat pump (4HP), the first load-side heat exchange unit (1HE) and the second load-side heat exchange unit (2HE). Four refrigerant lines 344 are provided. Each of the first refrigerant line 341 to the fourth refrigerant line 344 may be overlapped or merged in some sections. The first refrigerant line 341 to the fourth refrigerant line 344 may selectively connect the first load-side heat exchange part 1HE and the second load-side heat exchange part 2HE. That is, when the first heat pump (1HP) to the fourth heat pump (4HP) is in cooling operation, the refrigerant is supplied to the first load-side heat exchange unit (1HE), and in the case of heating operation, the refrigerant is supplied to the second load-side heat exchange unit (2HE). In the case of 1:1 operation, the first heat pump (1HP) and the third heat pump (3HP) supply refrigerant to the first load-side heat exchange unit (1HE), and the second heat pump (2HP) and the fourth heat are The pump 4HP may supply the refrigerant to the second load-side heat exchange unit 2HE.

A fifth refrigerant line 345 is provided between the second refrigerant line 342 and the fourth refrigerant line 344. At this time, a fifth three-way valve (5V) is provided at the intersection of the second refrigerant line 342 and the fifth refrigerant line 345, and the fourth refrigerant line 344 and the fifth refrigerant line 345 cross. A sixth three-way valve (6V) is provided in the portion. The fifth three-way valve (5V) supplies refrigerant to the heat exchange unit (1HE) on the first load side when the second heat pump (2HP) is in cooling operation, or supplies the refrigerant to the heat exchange unit (2HE) on the second load side when the heating operation is performed. To be opened and closed. In addition, the sixth three-way valve (6V) supplies refrigerant to the first load-side heat exchange unit (1HE) when the fourth heat pump (4HP) is operating, or to the second load-side heat exchange unit (2HE) when the fourth heat pump (4HP) operates. It is opened and closed to supply.

According to the geothermal heat pump system capable of restoring geothermal energy in the ground according to the present invention, when any one of the first heat pump to the fourth heat pump operates for heating (or hot water supply), some of the heat source water discharged from the remaining heat pumps By supplying to any one of the heat pumps, it is possible to recover at least a part of the stress of the underground heat source, the first heat pump and the third heat pump are operated for cooling, and the second heat pump and the fourth heat pump are heated (or hot water supply). In the case of operation (1:1 response), the temperature of the heat source water discharged from the second heat pump and the fourth heat pump is relatively lowered and supplied to the underground heat exchanger, thereby recovering all the stress of the underground heat source. Since the stress of the heat source is restored, the temperature of the heat source water to be supplied to the heat pump for cooling operation can be lowered, thereby improving the COP of the heat pump that receives the heat source water from the underground heat exchange unit. Since the pump can be operated simultaneously or individually in a simultaneous cooling or heating mode, a hot water heat pump is not required, and the pressure of the heat source water to be supplied to the heat pump operating heating (or hot water supply) can be compensated through the second pump. There is an effect of preventing a safety accident due to a lack of flow rate in the operated heat pump.

Although shown and described above by specific embodiments to illustrate the technical idea of the present invention, the present invention is not limited to the same configuration and operation as the specific embodiment as described above, and various modifications do not depart from the scope of the present invention. Can be carried out within. Accordingly, such modifications should also be considered to be within the scope of the present invention, and the scope of the present invention should be determined by the claims to be described later.

100, 200, 300: Geothermal heat pump system capable of restoring geothermal energy from the ground
110: 1 line
120: 2 lines
130: 3 lines
140: refrigerant line
1HP: 1st heat pump
2HP: 2nd heat pump
3HP: 3rd heat pump
4HP: 4th heat pump
1HE: Heat exchange part on the first load side
2HE: Heat exchange part on the second load side

Claims (15)

A first line provided with a first pump to supply heat source water from the underground heat exchange unit to the first heat pump to the fourth heat pump, respectively;
A second line for collecting heat source water heat-exchanged by the first to fourth heat pumps and discharging it to the underground heat exchanger; And
A third line branched on the second line and connected to the first line, and supplies some heat source water discharged from at least one of the first heat pump to the third heat pump to the fourth heat pump Including ;,
The first line includes lines 1-1 to 1-4 respectively connecting the first heat pumps to the fourth heat pumps from the underground heat exchanger,
The second line includes lines 2-1 to 2-4 connecting the underground heat exchange unit from each of the first heat pumps to the fourth heat pumps,
The third line is branched from the line 2-3 and is connected to the line 1-4, and a first three-way valve is provided at a portion where the third line and the line 1-4 intersect. Geothermal heat pump system capable of restoring geothermal energy in the ground. delete delete The method according to claim 1,
The first to fourth lines,
Geothermal heat pump system capable of restoring geothermal energy from the ground, including a second pump disposed between the first three-way valve and the fourth heat pump to compensate for the pressure of the heat source water to be supplied to the fourth heat pump. The method according to claim 1,
The third line,
A first three-way valve provided at one end branched from the 2-3 line,
A geothermal heat pump system capable of restoring geothermal energy from the ground connecting a second three-way valve provided at the other end crossing the line 1-4. The method of claim 5,
The third line,
Geothermal heat pump system capable of restoring geothermal energy from the ground, including a second pump disposed between the first three-way valve and the second three-way valve to compensate for the pressure of the heat source water to be supplied to the fourth heat pump. The method according to claim 1,
The third line,
3-1 connecting a first three-way valve provided at one end branched from the 2-3 line, and a second three-way valve provided at the other end where the first three-way valve and the 1-4 line intersect Line and,
3-2 connecting a third three-way valve provided at one end branched from the 2-1 line and a fourth three-way valve provided at the other end where the third three-way valve and the 2-1 line intersect Geothermal heat pump system capable of restoring geothermal energy in the ground including lines. The method of claim 7,
A geothermal heat pump system capable of restoring underground geothermal energy including a second pump for compensating the pressure of the heat source water to be supplied to the second heat pump and the fourth heat pump, respectively, in the 3-1 line and the 3-2 line. . The method according to claim 7 or 8,
Further comprising a first load side heat exchange unit and a second load side heat exchange unit connected to the first heat pump to the fourth heat pump,
Geothermal energy recovery is possible, further comprising first to fourth refrigerant lines for selectively transferring refrigerant between the first to fourth heat pumps and the first load-side heat exchanger or the second load-side heat exchanger. Geothermal heat pump system. The method of claim 9,
Geothermal heat pump system capable of restoring geothermal energy in the ground, further comprising a fifth refrigerant line connecting the second refrigerant line and the fourth refrigerant line. The method of claim 10,
The second refrigerant line includes a fifth three-way valve provided at a portion crossing the fifth refrigerant line,
The fourth refrigerant line is a geothermal heat pump system capable of restoring geothermal energy from the ground including a sixth three-way valve selectively supplying a refrigerant to the first load side heat exchange unit or the second load side heat exchange unit. The method of claim 11,
When the first heat pump and the third heat pump are in cooling operation through the first load-side heat exchanger, high-temperature heat source water is supplied through the 3-1 line and the 3-2 line, respectively, the second heat pump and the fourth heat pump. Supplied by a heat pump,
A geothermal heat pump system capable of restoring geothermal energy from the ground through the second heat pump and the fourth heat pump to supply hot water to the second load-side heat exchanger. The method of claim 12,
A geothermal heat pump system capable of restoring underground geothermal energy in which the heat source water discharged from the second heat pump and the fourth heat pump is lower than the heat source water provided from the first heat pump and the third heat pump. The method of claim 12,
The underground heat exchange part,
A geothermal heat pump system capable of restoring underground geothermal energy in which underground heat source energy is recovered through the heat source water discharged from the fourth heat pump or the second heat pump and the fourth heat pump. The method of claim 12,
The first to fourth heat pumps,
A geothermal heat pump system capable of restoring geothermal energy that can be operated simultaneously in cooling or heating mode, or at least one or more individually operated in different modes.

Images