KR20210109238A - Heat pump system and operating method of the same - Google Patents

Abstract

The present invention relates to a heat pump system and an operating method thereof. The heat pump system comprises: a load-side heat exchanger; a heat source-side heat exchanger; a compressor which discharges a gaseous refrigerant with a high temperature and high pressure to the load-side heat exchanger or the heat source-side heat exchanger through a four-way valve whose direction is set in accordance with a heating and cooling operation mode, and absorbs the circulating refrigerant; an additional heat exchanger which makes the refrigerant discharged from the load-side heat exchanger or the heat source-side heat exchanger exchange heat with a heat source-side working fluid in accordance with the heating/cooling operation mode, and increases the temperature of the heat source-side working fluid; an expansion valve which expands the refrigerant discharged from the additional heat exchanger; and valves which are placed on a refrigerant circulation path, form a refrigerant flow which transfers the refrigerant discharged from the load-side heat exchanger to the additional heat exchanger in the heating operation mode and which transfers the refrigerant expanded by the expansion valve to the heat source-side heat exchanger, and form a refrigerant flow which transfers the refrigerant discharged from the heat source-side heat exchanger to the additional heat exchanger in the cooling operation mode and transfers the refrigerant expanded by the expansion valve to the load-side heat exchanger. The heat source-side working fluid whose temperature has increased in the additional heat exchanger is introduced into the heat source-side heat exchanger. The present invention aims to provide a heat pump system and an operation method thereof, which are capable of increasing cooling efficiency.

Description

Heat pump system and operating method of the same

The present invention relates to a heat pump.

The heat pump provides heating or cooling to the load side by configuring the refrigerant to circulate through the compressor, condenser, expansion valve and evaporator. The refrigerant discharged from the compressor releases heat from the condenser to the secondary working fluid, such as water or air, and is converted to a low-temperature and low-pressure state at the expansion valve. After absorbing heat from the secondary working fluid in the evaporator, it is sucked into the compressor. . Although the operating principle of such a heat pump is implemented in various products, research to increase the coefficient of performance (COP) in the cooling mode and the heating mode continues.

A heat pump may use various types of heat sources, among which there is a geothermal heat pump using geothermal heat as a heat source. The working fluid on the heat source side of the geothermal heat pump is configured to exchange heat with the ground in a geothermal exchanger installed underground. Geothermal heat has the advantage of maintaining a constant temperature without significant influence on the temperature change on the ground. However, since a certain time is required for heat transfer in the ground, the efficiency of the heat pump decreases over time, and when a certain temperature is reached Sometimes the heat pump has to stop.

An object to be solved is to provide a heat pump system that increases cooling and heating efficiency through an additional heat exchanger operating as a secondary condenser in a cooling and heating operation mode.

As a heat pump system according to an embodiment, a load-side heat exchanger, a heat source-side heat exchanger, and a high-temperature and high-pressure gaseous refrigerant are discharged to the load-side heat exchanger or the heat source-side heat exchanger through a four-way valve set in a direction according to a heating/cooling operation mode. and additional heat exchange to increase the temperature of the heat source side working fluid by exchanging heat with the refrigerant discharged from the load side heat exchanger or the heat source side heat exchanger according to the compressor that sucks the circulated refrigerant and the heating/cooling operation mode device, an expansion valve for expanding the refrigerant discharged from the additional heat exchanger, and a refrigerant circulation path, transferring the refrigerant discharged from the load-side heat exchanger to the additional heat exchanger in a heating operation mode, and expanding the expansion valve Forming a refrigerant flow for transferring the refrigerant to the heat source side heat exchanger, transferring the refrigerant discharged from the heat source side heat exchanger to the additional heat exchanger in the cooling operation mode, and transferring the refrigerant expanded by the expansion valve to the load side heat exchanger It includes valves that form a refrigerant flow. The heat source-side working fluid whose temperature has risen in the additional heat exchanger flows into the heat source-side heat exchanger.

The additional heat exchanger may operate as a condenser in the cooling operation mode and the heating operation mode to supercool the introduced refrigerant.

The heat source side working fluid may circulate through the underground heat exchanger, the additional heat exchanger, and the heat source side heat exchanger.

The valves include a first one-way valve for making a refrigerant flow from the load-side heat exchanger to the additional heat exchanger, a second one-way valve for creating a refrigerant flow from the heat source-side heat exchanger to the additional heat exchanger, and a refrigerant flow from the expansion valve to the load-side heat exchanger. It may include a third one-way valve that makes a, and a fourth one-way valve that makes a refrigerant flow from the expansion valve to the heat source side heat exchanger.

The valves include a first on-off valve positioned between the load-side heat exchanger and the additional heat exchanger, a second on-off valve positioned between the heat source-side heat exchanger and the additional heat exchanger, and between the expansion valve and the load-side heat exchanger. It may include a third on-off valve, and a fourth on-off valve positioned between the expansion valve and the heat source side heat exchanger. In the heating operation mode, the first on-off valve and the fourth on-off valve may be opened, and the second on-off valve and the third on-off valve may be closed. In the cooling operation mode, the first on-off valve and the fourth on-off valve may be closed, and the second on-off valve and the third on-off valve may be opened.

As a heat pump system according to another embodiment, a refrigerant discharged from the load side heat exchanger or the heat source side heat exchanger according to an underground heat exchanger, a load side heat exchanger, a heat source side heat exchanger, and a heating/cooling operation mode, and a heat source side working fluid An additional heat exchanger for exchanging heat, an expansion valve for expanding the refrigerant discharged from the additional heat exchanger, and a refrigerant circulation path, the refrigerant discharged from the load-side heat exchanger in a heating operation mode is transferred to the additional heat exchanger, and the expansion Forms a refrigerant flow that transfers the refrigerant expanded in the valve to the heat source side heat exchanger, transfers the refrigerant discharged from the heat source side heat exchanger to the additional heat exchanger in a cooling operation mode, and transfers the refrigerant expanded by the expansion valve to the load side It includes valves that form a refrigerant flow that passes to the heat exchanger. The heat source side working fluid circulates in the underground heat exchanger, the additional heat exchanger, and the heat source side heat exchanger.

The temperature of the working fluid on the heat source side may be increased by absorbing heat from the refrigerant in the additional heat exchanger.

The refrigerant discharged from the additional heat exchanger may be supercooled.

According to the embodiment, through the additional heat exchanger operating as a secondary condenser in the cooling and heating operation mode, it is possible to increase the temperature of the working fluid on the heat source side flowing into the evaporator in the heating operation mode, and by increasing the temperature of the working fluid on the heat source side It is possible to increase the heating efficiency of the heat pump with the increased evaporation pressure.

According to the embodiment, the supercooling degree may be increased by lowering the temperature of the refrigerant flowing into the expansion valve in the heating operation mode through the additional heat exchanger operating as the secondary condenser in the cooling and heating operation mode.

According to the embodiment, through the additional heat exchanger operating as a secondary condenser in the cooling and heating operation mode, the condensing capacity is increased in the cooling operation mode, and the cooling efficiency of the heat pump can be increased by supercooling the refrigerant.

According to the embodiment, even if the heat exchange in the geothermal exchanger does not proceed quickly, the additional heat exchanger increases the temperature of the working fluid on the heat source side in the heating operation mode to increase the evaporation temperature of the refrigerant, thereby increasing the heating efficiency, and in the cooling operation mode By supercooling the refrigerant, it is possible to increase the cooling efficiency.

According to the embodiment, it is possible to provide an effect of absorbing or discharging a lot of heat from the ground relative to the same capacity by rapidly and rapidly increasing the temperature difference due to the underground heat exchange.

1 is a block diagram of a heat pump system.
2 is a block diagram of a heat pump system according to an embodiment.
3 is a diagram illustrating a refrigerant flow when the heat pump system of FIG. 2 is in a heating operation mode.
4 is a diagram illustrating a refrigerant flow when the heat pump system of FIG. 2 is in a cooling operation mode.
5 is a block diagram of a heat pump system according to another embodiment.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated. In addition, terms such as “…unit”, “…group”, and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

1 is a block diagram of a heat pump system.

Referring to FIG. 1 , the heat pump system 10 includes a compressor 11 , a four-way valve 12 , a load side heat exchanger 13 , an expansion valve 14 , and a heat source side heat exchanger 15 . In the heating operation mode, the load side heat exchanger 13 operates as a condenser, and the heat source side heat exchanger 15 operates as an evaporator. In the cooling operation mode, the load side heat exchanger 13 operates as an evaporator, and the heat source side heat exchanger 15 operates as a condenser.

The four-way valve 12 switches the direction of the refrigerant discharged from the compressor 11 to the load side heat exchanger 13 or the heat source side heat exchanger 15 according to the heating/cooling operation mode. That is, in the heating operation mode, the four-way valve 12 flows the high-temperature and high-pressure refrigerant discharged from the compressor 11 to the load-side heat exchanger 13, which is the condenser, in the cooling operation mode. The refrigerant flows out to the heat source side heat exchanger 15 which is a condenser.

The refrigerant flow in the heating operation mode is as follows. The refrigerant is discharged from the compressor 11 in a gaseous state of high temperature and high pressure, and flows into the load side heat exchanger 13 operating as a condenser. The refrigerant is converted into a high-temperature and high-pressure liquid refrigerant by discharging heat from the load-side heat exchanger 13 to the load-side working fluid such as water or air. The liquid refrigerant is converted into a liquid and gaseous refrigerant of low temperature and low pressure while passing through the expansion valve 14 and flows into the heat source side heat exchanger 15 operating as an evaporator. The refrigerant absorbs heat from the heat source side working fluid such as water or air while passing through the heat source side heat exchanger 15 to become a saturated gas. Thereafter, the refrigerant in a saturated gas state discharged from the heat source side heat exchanger 15 is sucked into the compressor 11 . The load-side working fluid discharged from the load-side heat exchanger 13 through the refrigerant flow absorbs heat from the refrigerant, and the heat-source-side working fluid discharged from the heat source-side heat exchanger 15 emits heat to the refrigerant.

In the cooling operation mode, the refrigerant is discharged to the heat source side heat exchanger 15 operating as a condenser by the four-way valve 12 , flows in the opposite direction to the heating operation mode, and is sucked into the compressor 11 .

Meanwhile, when the heat pump system 10 is a geothermal heat pump using geothermal heat as a heat source, a geothermal exchanger 20 may be further included. The working fluid on the heat source side is configured to exchange heat with the ground in the geothermal exchanger 20 installed underground. geothermal

Geothermal heat has the advantage of maintaining a constant temperature without significant influence on the temperature change on the ground, but since a certain time is required for heat transfer in the ground, the efficiency of the heat pump decreases over time.

For example, in the heating operation mode, the working fluid on the heat source side absorbs geothermal heat from the geothermal heat exchanger (20) and is input to the evaporator. lowers The soil adjacent to the geothermal heat exchanger 20, whose temperature has been lowered, needs to receive heat energy from the ground having a relatively high temperature to increase the temperature again, but it takes time for heat transfer. If the soil adjacent to the geothermal heat exchanger 20 does not reach a temperature sufficient to increase the temperature of the working fluid on the heat source side, the heat pump efficiency gradually decreases, and the heat pump operation may be stopped during the heat transfer time. Although it depends on the capacity of the heat pump and the geothermal heat exchanger, if the heat pump is operated for about 3 hours, it may be necessary to stop the operation for about 3 hours.

The heat pump system 10 absorbs heat from the refrigerant in the load side heat exchanger 13 operating as a condenser in the heating operation mode, and the load side working fluid absorbs heat in the load side heat exchanger 13 operating as an evaporator in the cooling operation mode. It is important that the refrigerant absorbs the heat generated by the load-side working fluid and evaporates. In addition, since the refrigerant circulates through the condenser and the evaporator in the heat pump system 10 , in the case of the heating operation mode, the more the heat absorbed from the ground by the working fluid on the heat source side, the higher the evaporation temperature of the refrigerant, thereby increasing heating efficiency. In the case of the cooling operation mode, the refrigerant that has absorbed heat in the load-side heat exchanger 13 operating as an evaporator is supercooled by the condenser to increase cooling efficiency. Accordingly, in the case of the heating operation mode, it is necessary to increase the evaporation temperature of the refrigerant in the heat source side heat exchanger 15 operating as an evaporator, and to supercool the refrigerant in the heat source side heat exchanger 15 operating as a compressor in the cooling operation mode.

However, when geothermal heat is used as a heat source, heat exchange in the geothermal exchanger 20 does not proceed quickly, so that the temperature of the working fluid on the heat source side does not increase in the heating operation mode, so the evaporation temperature of the refrigerant in the heat source side heat exchanger 15 is lowered, and the temperature of the working fluid on the heat source side cannot be lowered in the cooling operation mode, so that the heat of the refrigerant in the heat source side heat exchanger 15 is reduced. Therefore, in the case of the heat pump system 10 using geothermal heat as a heat source, a method of using a high-efficiency compressor or increasing the capacity of a heat exchanger is used in order to improve the coefficient of performance. However, if the heat exchanger capacity is increased, various problems such as cost increase, efficiency decrease due to pressure drop of the refrigerant cycle, increase in refrigerant amount, and decrease in oil recovery are derived.

In the following, a heat pump system that increases cooling and heating efficiency through an additional heat exchanger operating as a secondary condenser in the cooling and heating operation mode will be described in detail. The underground heat exchanger 20 may be omitted.

2 is a block diagram of a heat pump system according to an embodiment, FIG. 3 is a view showing refrigerant flow when the heat pump system of FIG. 2 is in a heating operation mode, and FIG. 4 is a cooling operation of the heat pump system of FIG. 2 It is a diagram showing the refrigerant flow in case of mode.

Referring to FIG. 2 , the heat pump system 100a includes a compressor 110 , a four-way valve 120 , a load side heat exchanger 130 , an expansion valve 140 , a heat source side heat exchanger 150 , and an additional heat exchanger 160 . ) is included. In the heating operation mode, the refrigerant circulates to the compressor 110 through the compressor 110 , the load side heat exchanger 130 , the additional heat exchanger 160 , the expansion valve 140 , and the heat source side heat exchanger 150 , and is cooled. In the operation mode, the refrigerant circulates to the compressor 110 through the compressor 110 , the heat source side heat exchanger 150 , the additional heat exchanger 160 , the expansion valve 140 , and the load side heat exchanger 130 . That is, in the heat pump system 100a, the additional heat exchanger 160 operates as a secondary condenser in the cooling and heating operation mode.

For this refrigerant circulation, the heat pump system 100a includes a plurality of devices for changing the refrigerant circulation path according to the operation mode. As the path change device, an on/off valve such as a solenoid valve, a four-way valve, or a one-way valve such as a check valve may be used. In the figure, it includes four one-way valves 171 , 172 , 173 , 174 as a path change device. The one-way valve 171 forms a direction so that the refrigerant discharged from the load-side heat exchanger 130 is input to the additional heat exchanger 160 , and the one-way valve 172 allows the refrigerant discharged from the heat source side heat exchanger 150 to further heat exchange. The direction is formed to be input to the group 160, and the direction of the one-way valves 171 and 172 is opposite. The one-way valve 173 forms a direction so that the refrigerant output from the additional heat exchanger 160 is expanded by the expansion valve 140 and then input to the load-side heat exchanger 130 , and the one-way valve 174 is an additional heat exchanger After the refrigerant output at 160 is expanded by the expansion valve 140 , the direction is formed to be input to the heat source side heat exchanger 150 , and the directions of the one-way valves 173 and 174 are opposite.

The heat source side working fluid performs primary heat exchange with the refrigerant in the additional heat exchanger 160 operating as a condenser, and secondary heat exchange with the refrigerant in the heat source side heat exchanger 150 .

In the heating operation mode, the working fluid on the heat source side absorbs heat from the additional heat exchanger 160 operating as a condenser and transfers heat to the refrigerant in the heat source side heat exchanger 150 operating as an evaporator while the temperature is increased. Accordingly, since the refrigerant absorbs heat from the working fluid on the heat source side whose temperature has risen, the evaporation temperature rises and the evaporation pressure rises.

In the cooling operation mode, the heat source side working fluid absorbs the heat of the refrigerant in the heat source side heat exchanger 150 operating as a condenser, and then absorbs the refrigerant heat again in the additional heat exchanger 160 operating as a condenser. is supercooled. That is, the additional heat exchanger 160 provides an effect of increasing the capacity of the condenser in the cooling operation mode, and through this, the refrigerant effectively discharges the heat absorbed by the load-side heat exchanger 130 operating as an evaporator, thereby increasing the cooling efficiency. have.

Therefore, even if heat exchange in the geothermal exchanger does not proceed quickly, the additional heat exchanger 160 increases the temperature of the working fluid on the heat source side in the heating operation mode to increase the evaporation temperature of the refrigerant, thereby increasing heating efficiency. In addition, the additional heat exchanger 160 supercools the refrigerant in the cooling operation mode, thereby increasing cooling efficiency.

Referring to FIG. 3 , in the heating operation mode, the refrigerant flow of the heat pump system 100a is as follows.

The refrigerant is discharged from the compressor 110 in a gaseous state of high temperature and high pressure, and flows into the load side heat exchanger 130 through the four-way valve 120 . The refrigerant exchanges heat (heat dissipation) with the load-side working fluid in the load-side heat exchanger 130 and is discharged in a high-temperature, high-pressure liquid state. The refrigerant flows through the one-way valve 171 into the additional heat exchanger 160 , and may exchange heat with the low-temperature heat source side working fluid in the additional heat exchanger 160 . The refrigerant discharged from the additional heat exchanger 160 is supercooled by heat exchange with the working fluid on the heat source side. The heat source side working fluid discharged from the additional heat exchanger 160 increases in temperature through heat exchange (heat absorption) with the refrigerant, and flows into the heat source side heat exchanger 150 to exchange heat with the refrigerant again. That is, the additional heat exchanger 160 raises the temperature of the working fluid on the heat source side that exchanges heat with the refrigerant in the heat source side heat exchanger 150 , thereby increasing the evaporation temperature and the evaporation pressure of the refrigerant.

The refrigerant supercooled in the additional heat exchanger 160 is changed to a low-temperature and low-pressure wet steam state in the expansion valve 140 , and is introduced into the heat source side heat exchanger 150 through the fourth one-way valve 174 . Since the temperature of the third one-way valve 173 connected to the load-side heat exchanger 130 is high, the refrigerant flows to the fourth one-way valve 174 connected to the heat source-side heat exchanger 150 .

In the heat source side heat exchanger 150, the refrigerant exchanges heat (heat absorption) with the heat source side working fluid whose temperature is increased by the additional heat exchanger 160 to become a low-temperature and low-pressure gaseous state, and passes through the four-way valve 120 to the compressor ( 110) is inhaled.

As such, in the heating operation mode of the heat pump system 100a, the heat source side working fluid flows into the heat source side heat exchanger 150 after heat exchange (heat absorption) with the refrigerant in the additional heat exchanger 160 . Accordingly, the evaporation pressure increases due to the increase in the temperature of the working fluid on the heat source side flowing into the heat source side heat exchanger 150 , and the energy efficiency (COP) of the heat pump can be increased. In addition, in the heating operation mode of the heat pump system 100a, the refrigerant flows into the expansion valve after heat exchange (heat release) with the working fluid on the heat source side in the additional heat exchanger 160 . Accordingly, it is possible to obtain the effect of increasing the amount of heat by the supercooled refrigerant.

Referring to FIG. 4 , in the cooling operation mode, the refrigerant flow of the heat pump system 100a is as follows.

The refrigerant is discharged from the compressor 110 in a gaseous state of high temperature and high pressure, and flows into the heat source side heat exchanger 150 through the four-way valve 120 . The refrigerant heats up (discharges heat) with the working fluid on the heat source side in the heat source side heat exchanger 150 and is discharged as a liquid at high temperature and high pressure.

The refrigerant may be introduced into the additional heat exchanger 160 through the one-way valve 172 , and may additionally exchange heat (heat dissipation) with the working fluid on the heat source side in the additional heat exchanger 160 . The refrigerant discharged from the additional heat exchanger 160 is supercooled by heat exchange with the working fluid on the heat source side.

The refrigerant discharged from the additional heat exchanger 160 flows into the expansion valve 140 . The refrigerant passing through the expansion valve 140 is changed to a low-temperature and low-pressure wet steam state, and the refrigerant passing through the third one-way valve 173 is introduced into the load-side heat exchanger 130 .

The refrigerant exchanges heat (heat absorption) with the load-side working fluid in the load-side heat exchanger 130 to become a low-temperature and low-pressure gaseous state, and is sucked into the compressor 110 through the four-way valve 120 .

As such, in the cooling operation mode of the heat pump system 100a, the heat source side working fluid absorbs the heat of the refrigerant in the heat source side heat exchanger 150 operating as a condenser, and then an additional heat exchanger 160 operating as a condenser. By absorbing heat from the refrigerant again, the refrigerant is supercooled. Therefore, the additional heat exchanger 160 provides an effect of increasing the capacity of the condenser in the cooling operation mode, and through this, the refrigerant effectively discharges the heat absorbed by the load-side heat exchanger 130 operating as an evaporator, thereby increasing the cooling efficiency. have.

5 is a block diagram of a heat pump system according to another embodiment.

Referring to FIG. 5 , the heat pump system 100b connects the four one-way valves 171 , 172 , 173 , and 174 of the heat pump system 100a to four on-off valves 181 such as a solenoid valve. , 182, 183, 184). At this time, the opening and closing of the opening/closing valves 181 , 182 , 183 , and 184 are controlled as shown in Table 1 according to the operation mode.

driving mode on/off valve 1
(181) on/off valve 2
(182) on/off valve 3
(183) on/off valve 4
(184) heating open closed closed open cooling closed open open closed

As such, according to the embodiment, through the additional heat exchanger operating as a secondary condenser in the cooling and heating operation mode, the temperature of the heat source side working fluid flowing into the evaporator in the heating operation mode can be increased, and the temperature of the heat source side working fluid It is possible to increase the heating efficiency of the heat pump by the evaporation pressure increased by the rise.

According to the embodiment, the supercooling degree may be increased by lowering the temperature of the refrigerant flowing into the expansion valve in the heating operation mode through the additional heat exchanger operating as the secondary condenser in the cooling and heating operation mode.

According to the embodiment, through the additional heat exchanger operating as a secondary condenser in the cooling and heating operation mode, the condensing capacity is increased in the cooling operation mode, and the cooling efficiency of the heat pump can be increased by supercooling the refrigerant.

According to the embodiment, even if the heat exchange in the geothermal exchanger does not proceed quickly, the additional heat exchanger increases the temperature of the working fluid on the heat source side in the heating operation mode to increase the evaporation temperature of the refrigerant, thereby increasing the heating efficiency, and in the cooling operation mode By supercooling the refrigerant, it is possible to increase the cooling efficiency.

According to the embodiment, it is possible to provide an effect of absorbing or discharging a lot of heat from the ground relative to the same capacity by rapidly and rapidly increasing the temperature difference due to the underground heat exchange.

The embodiment of the present invention described above is not implemented only through the apparatus and method, and may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium in which the program is recorded.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improved forms of the present invention are also provided by those skilled in the art using the basic concept of the present invention as defined in the following claims. is within the scope of the right.

Claims (8)

A heat pump system comprising:
load side heat exchanger, heat source side heat exchanger,
A compressor that discharges high-temperature and high-pressure gaseous refrigerant to the load side heat exchanger or the heat source side heat exchanger through a four-way valve set in a direction according to the heating/cooling operation mode, and sucks the circulated refrigerant;
An additional heat exchanger that heats the refrigerant discharged from the load side heat exchanger or the heat source side heat exchanger and the heat source side working fluid to increase the temperature of the heat source side working fluid according to the heating/cooling operation mode;
an expansion valve for expanding the refrigerant discharged from the additional heat exchanger, and
It is disposed in the refrigerant circulation path and forms a refrigerant flow that transfers the refrigerant discharged from the load side heat exchanger to the additional heat exchanger in a heating operation mode, and transfers the refrigerant expanded by the expansion valve to the heat source side heat exchanger, and a cooling operation mode to transfer the refrigerant discharged from the heat source side heat exchanger to the additional heat exchanger, and include valves that form a refrigerant flow that transmits the refrigerant expanded in the expansion valve to the load side heat exchanger,
The heat-source-side working fluid whose temperature has risen in the additional heat exchanger flows into the heat-source-side heat exchanger. In claim 1,
The additional heat exchanger operates as a condenser in the cooling operation mode and the heating operation mode to supercool the introduced refrigerant. In claim 1,
The heat source side working fluid circulates through the underground heat exchanger, the additional heat exchanger, and the heat source side heat exchanger. In claim 1,
the valves are
A first one-way valve for making a refrigerant flow from the load-side heat exchanger to the additional heat exchanger, a second one-way valve for creating a refrigerant flow from the heat-source-side heat exchanger to the additional heat exchanger, a second one-way valve for creating a refrigerant flow from the expansion valve to the load-side heat exchanger 3 , a one-way valve, and a fourth one-way valve for creating a refrigerant flow from the expansion valve to the heat source side heat exchanger. In claim 1,
the valves are
A first opening/closing valve located between the load side heat exchanger and the additional heat exchanger, a second opening/closing valve located between the heat source side heat exchanger and the additional heat exchanger, and a third opening/closing valve located between the expansion valve and the load side heat exchanger a valve, and a fourth on/off valve positioned between the expansion valve and the heat source side heat exchanger,
In the heating operation mode, the first on-off valve and the fourth on-off valve are opened, and the second on-off valve and the third on-off valve are closed,
In the cooling operation mode, the first on-off valve and the fourth on-off valve are closed, and the second on-off valve and the third on-off valve are opened. A heat pump system comprising:
underground heat exchanger,
load side heat exchanger,
heat source side heat exchanger,
An additional heat exchanger for exchanging heat with the refrigerant discharged from the load side heat exchanger or the heat source side heat exchanger according to a heating/cooling operation mode, and a heat source side working fluid;
an expansion valve for expanding the refrigerant discharged from the additional heat exchanger, and
It is disposed in the refrigerant circulation path and forms a refrigerant flow that transfers the refrigerant discharged from the load side heat exchanger to the additional heat exchanger in a heating operation mode, and transfers the refrigerant expanded by the expansion valve to the heat source side heat exchanger, and a cooling operation mode to transfer the refrigerant discharged from the heat source side heat exchanger to the additional heat exchanger, and include valves that form a refrigerant flow that transmits the refrigerant expanded in the expansion valve to the load side heat exchanger,
The heat source side working fluid circulates through the underground heat exchanger, the additional heat exchanger, and the heat source side heat exchanger. In claim 6,
The heat source-side working fluid absorbs heat from the refrigerant in the additional heat exchanger to increase the temperature. In claim 6,
The refrigerant discharged from the additional heat exchanger is supercooled, a heat pump system.

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