KR102111318B1 - Heat pump system for vehicle - Google Patents

Abstract

The present invention relates to a heat pump system for a vehicle, and more particularly, to a refrigerant circulation line between a first expansion means and an outdoor heat exchanger, a coolant circulating a vehicle electrical appliance and a refrigerant-cooling water heat exchanger for heat exchange the refrigerant are installed. By installing a bypass line in the refrigerant circulation line so that the refrigerant passing through the refrigerant-cooling water heat exchanger bypasses the outdoor heat exchanger, the refrigerant discharged from the refrigerant-cooling water heat exchanger in the heat pump mode bypasses the outdoor heat exchanger. Since no outdoor heat exchanger is used, prevention and defrosting of the outdoor heat exchanger is unnecessary, and the fuel efficiency of the vehicle can be improved. In addition, when the waste heat of the cooling water is insufficient, the vehicle engine can be driven to enable heating in a cryogenic environment. The electric heating heater of All.

Description

Heat pump system for vehicles

The present invention relates to a heat pump system for a vehicle, and more particularly, to a refrigerant circulation line between a first expansion means and an outdoor heat exchanger, a coolant circulating a vehicle electrical appliance and a refrigerant-cooling water heat exchanger for heat exchange the refrigerant are installed. The refrigerant circulation line relates to a vehicle heat pump system in which a bypass line is installed so that refrigerant passing through the refrigerant-coolant heat exchanger bypasses the outdoor heat exchanger.

2. Description of the Related Art An air conditioner for a vehicle generally includes a cooling system for cooling a vehicle interior and a heating system for heating a vehicle interior. The cooling system is configured to exchange air passing through the outside of the evaporator on the evaporator side of the refrigerant cycle with a refrigerant flowing inside the evaporator to turn it into a cool air, to cool the vehicle interior, and the heating system circulates the engine cooling water to the heater core On the heater core side, the air passing through the outside of the heater core is exchanged with cooling water flowing inside the heater core to change to warm air, and is configured to heat the vehicle interior.

In addition, in the case of a hybrid vehicle, there are an engine driving mode in which the engine is driven and running, and a battery driving mode in which the engine is stopped and the motor is driven by a battery, and heating in the hybrid vehicle uses heat of the cooling water of the engine. Is done.

However, in the hybrid vehicle, since the engine is heated using the heat of the engine coolant, the engine needs to be unnecessarily operated in the battery driving mode, thereby reducing fuel consumption.

Particularly, in a low temperature condition, despite being able to run using a battery, the engine is always forced to operate, so the advantages of the hybrid vehicle are reduced, and consequently, fuel efficiency is further deteriorated.

As an alternative to solve the above problems, a heat pump system capable of selectively performing cooling and heating using one refrigerant cycle has been developed,

An example of such a vehicle heat pump system is shown in FIG. 1.

The vehicle heat pump system shown in FIG. 1 is installed in a refrigerant circulation line 1, a compressor 30 for compressing and discharging refrigerant, and an indoor heat exchanger 32 for dissipating refrigerant discharged from the compressor 30 And, a first expansion valve 34 installed in the expansion line 3 installed in parallel with the refrigerant circulation line 1 and selectively expanding the refrigerant that has passed through the indoor heat exchanger 32, and the expansion line ( 3) a first direction change valve (81) for switching the direction of refrigerant flow to and an outdoor heat exchanger (1) that exchanges the refrigerant that has passed through the first expansion valve (34) or the first direction change valve (81) outdoors. 48), an evaporator (60) for evaporating the refrigerant passing through the outdoor heat exchanger (48), and an accumulator (Accumulator, 62) separating the refrigerant passing through the evaporator (60) into a gaseous and liquid refrigerant. A second expansion valve (56) for expanding the refrigerant supplied to the evaporator (60), and 2 Bypass line (2) which is installed in parallel with the expansion valve (56) and evaporator (60) to selectively connect the outlet side of the outdoor heat exchanger (48) and the inlet side of the accumulator (62), and the bypass It comprises a second direction switching valve 83 for switching the flow direction of the refrigerant to the pass line (2).

In addition, the bypass line 2 is provided with a water-cooled heat exchanger 75 for exchanging coolant circulating the vehicle electrical equipment 72 and the refrigerant flowing in the bypass line 2, from the vehicle electrical equipment 72 Heat is recovered and used as a heating heat source.

In FIG. 1, reference numeral 50 denotes an air conditioning case in which the indoor heat exchanger 32 and an evaporator 60 are built, reference numeral 74 denotes a temperature-adjusting door that controls the mixing amount of cold and warm air, and reference numeral 70 denotes an interior of the air-conditioning case. An electric heating heater installed at the rear side of the heat exchanger 32, reference numeral 5 denotes an auxiliary bypass line for allowing the refrigerant to bypass the outdoor heat exchanger 48 in the defrost mode.

According to the conventional vehicle heat pump system configured as described above, when the heat pump mode (heating mode) is operated, the bypass line 2 is opened, and the temperature control door 74 operates as shown in FIG. 1. Therefore, the refrigerant discharged from the compressor 30 is an indoor heat exchanger 32, a first expansion valve 34, an outdoor heat exchanger 48, a bypass line 2, a water-cooled heat exchanger 75, an accumulator 62 ) In turn to return to the compressor 30. That is, the indoor heat exchanger 32 serves as a heater, and the outdoor heat exchanger 48 serves as an evaporator.

When the air conditioner mode (cooling mode) is activated, the expansion line 3 and the bypass line 2 are closed, and the temperature control door 74 closes the passage on the indoor heat exchanger 32 side. Therefore, the refrigerant discharged from the compressor 30 passes through the indoor heat exchanger 32, the outdoor heat exchanger 48, the second expansion valve 56, the evaporator 60, and the accumulator 62 in order to the compressor 30. To return That is, the evaporator 60 serves as an evaporator, and the indoor heat exchanger 32 closed by the temperature control door 74 functions as a heater as in the heat pump mode.

In the above-described conventional vehicle heat pump system, in the heat pump mode (heating mode), the indoor heat exchanger 32 installed inside the air conditioning case 50 serves as a heater to perform heating, and the outdoor heat exchanger ( 48) is installed on the outside of the air conditioning case 50, that is, installed on the front side of the engine room of the vehicle to serve as an evaporator to exchange heat with the outside.

At this time, as the temperature of the refrigerant flowing into the outdoor heat exchanger (48) exchanges heat with the outside air, the surface of the outdoor heat exchanger (48) falls below the freezing point, and an idea begins to occur on the surface of the outdoor heat exchanger (48). do.

When an accident occurs on the surface of the outdoor heat exchanger 48, the system is switched to the defrost mode, that is, the auxiliary bypass line 5 is opened to allow the refrigerant to bypass the outdoor heat exchanger 48 to defrost. Will do. Of course, the auxiliary bypass line 5 is opened even at an extremely low temperature where the outdoor heat exchanger 48 is difficult to exchange heat with the outside air.

However, since an idea occurs in the outdoor heat exchanger (48) to perform a defrosting mode or heat cannot be recovered from the outside air at cryogenic temperatures, the refrigerant flowing through the bypass line (2) uses the water-cooled heat exchanger (75). Through this, heat is recovered by exchanging heat with the electric vehicle 72 of the vehicle. At this time, there is a problem in that the heating performance is deteriorated due to insufficient heat of the electric vehicle 72.

In addition, when the heating performance is insufficient as described above, there is a problem in that the operation rate of the electric heating heater 70 increases, resulting in high power consumption and lower fuel consumption.

In addition, since the heating performance of the heat pump system is limited in a low temperature environment, there is a problem in that the electric heating heater 70 must be additionally installed.

An object of the present invention for solving the above problems is to install a refrigerant-cooling water heat exchanger for exchanging the coolant circulating the vehicle electrical equipment and the refrigerant in the refrigerant circulation line between the first expansion means and the outdoor heat exchanger, and the refrigerant circulation line By installing a bypass line so that the refrigerant passing through the refrigerant-cooling water heat exchanger bypasses the outdoor heat exchanger, the refrigerant discharged from the refrigerant-cooling water heat exchanger bypasses the outdoor heat exchanger in the heat pump mode to use the outdoor heat exchanger. Since it does not need to prevent and prevent defrosting of the outdoor heat exchanger, it can also improve the fuel efficiency of the vehicle, and when the waste heat of the cooling water is insufficient, the vehicle engine can be driven to enable heating in a cryogenic environment and to separate electric heating heaters. It is also to provide an unnecessary vehicle heat pump system.

The present invention for achieving the above object is installed on a refrigerant circulation line, the compressor for compressing and discharging the refrigerant, and installed inside the air-conditioning case to exchange heat between the air in the air-conditioning case and the refrigerant discharged from the compressor. Roof tile, an evaporator installed inside the air-conditioning case to exchange air in the air-conditioning case and the refrigerant supplied to the compressor, and outdoor heat exchange that is installed outside the air-conditioning case to exchange heat between the refrigerant and the outside air circulating the refrigerant circulation line A first expansion means installed on the refrigerant circulation line on the outlet side of the indoor heat exchanger to selectively expand the refrigerant discharged from the indoor heat exchanger, and refrigerant installed on the inlet refrigerant circulation line of the evaporator and supplied to the evaporator. In the vehicle heat pump system comprising a second expansion means for expanding, In the first In the refrigerant circulation line between the expansion means and the outdoor heat exchanger, a refrigerant-cooling water heat exchanger is provided for exchanging coolant circulating the vehicle electronics and refrigerant circulating the refrigerant circulation line, and in the refrigerant circulation line, the refrigerant-cooling water heat exchange It characterized in that the bypass line is installed so that the refrigerant passing through the air bypasses the outdoor heat exchanger.

In the present invention, a refrigerant-cooling water heat exchanger for heat-exchanging coolant and refrigerant circulating a vehicle electrical appliance is installed in the refrigerant circulation line between the first expansion means and the outdoor heat exchanger, and the refrigerant circulation line passes through the refrigerant-cooling water heat exchanger. By installing a bypass line so that the refrigerant bypasses the outdoor heat exchanger, the refrigerant discharged from the refrigerant-coolant heat exchanger in the heat pump mode bypasses the outdoor heat exchanger and does not use the outdoor heat exchanger, thus preventing the formation of an outdoor heat exchanger And defrosting is unnecessary, and vehicle fuel efficiency can be improved.

In addition, when the waste heat of the cooling water is insufficient, the vehicle engine can be driven, so that heating in a heat pump mode in a cryogenic environment (eg -20 ° C) is possible, and a separate electric heating heater is unnecessary, so the system is simple.

In addition, according to the coolant temperature or the outside temperature, an electric appliance coolant heat source or an engine coolant heat source can be selectively used to increase the heating performance of the heat pump mode.

In addition, while performing dehumidification through the evaporator, heating is possible using an engine coolant (heater core) or an indoor heat exchanger.

In addition, when the temperature control door is adjusted in the air conditioner mode, the refrigerant heat source of the indoor heat exchanger can be used, so that the discharge temperature in the cabin can be adjusted.

In addition, since an electric heating heater is unnecessary, power consumption can be reduced and fuel efficiency can be improved.

1 is a block diagram showing a conventional vehicle heat pump system,
2 is a block diagram showing an air conditioner mode in a vehicle heat pump system according to the present invention;
3 is a block diagram showing a heat pump mode in the vehicle heat pump system according to the present invention,
4 is a block diagram showing a mode that uses both the heat source of the coolant and the engine coolant during heat pump mode operation in the vehicle heat pump system according to the present invention,
5 is a configuration diagram showing a mode using only the engine cooling water heat source during the heat pump mode operation in the vehicle heat pump system according to the present invention,
6 is a view showing a refrigerant-coolant heat exchanger in a vehicle heat pump system according to the present invention;
7 is a cross-sectional view showing an operating state of the first expansion means in the vehicle heat pump system according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, a heat pump system for a vehicle according to the present invention includes a compressor 100, an indoor heat exchanger 110, a first expansion means 120, a refrigerant-cooled water heat exchanger 200, an outdoor heat exchanger 130, and a second It is configured by connecting the expansion means 140, the evaporator 160, and the accumulator 170 to the refrigerant circulation line R,

A bypass line R1 is installed to bypass the outdoor heat exchanger 130, and an auxiliary bypass line R2 is installed to bypass the second expansion means 140 and the evaporator 160,

In addition, the first, second, and third cooling water circulation lines (W1, W2, W3) are installed to use the cooling water heat source of the vehicle electrical components 205 and the vehicle engine 210, and are applied to hybrid vehicles or fuel cell vehicles. It is desirable to be.

The first cooling water circulation line (W1) is a line circulating the coolant circulating the vehicle electrical equipment 205 in the air conditioner mode or the heat pump mode to the refrigerant-cooling water heat exchanger 200, and the second cooling water circulation line (W2) Is a line in which the vehicle engine 210 coolant circulates through the heater core 220 and the engine radiator 215 when the vehicle engine 210 additionally uses a cooling water heat source in the heat pump mode, and the third cooling water circulation line ( W3) is a line that circulates in the vehicle engine 210 cooling water to the heater core 220, the engine radiator 215, and the refrigerant-cooling water heat exchanger 200 when the vehicle engine 210 wants to use only the cooling water heat source in the heat pump mode. to be.

The refrigerant circulation line (R), the refrigerant discharged from the compressor 100 in the air conditioner mode is the indoor heat exchanger 110, the first expansion means 120 (unexpanded), refrigerant-cooling water heat exchanger 200 , The outdoor heat exchanger 130, the second expansion means 140 (expansion), the evaporator 160, the accumulator 170, the compressor 100 to configure the line to circulate,

In the heat pump mode, the bypass line (R1) and the auxiliary bypass line (R2) is opened, the refrigerant discharged from the compressor 100 is the indoor heat exchanger 110, the first expansion means (120) (Expansion), refrigerant-cooling water heat exchanger 200, the accumulator 170, the compressor 100 will be circulated.

Hereinafter, each component of the heat pump system will be described in detail.

First, the compressor 100 installed on the refrigerant circulation line (R) receives power from the engine 210 (internal combustion engine or motor, etc.) while driving, inhales and compresses refrigerant, and then discharges it in a gas state of high temperature and high pressure. do.

In the air conditioner mode, the compressor 100 sucks and compresses refrigerant discharged from the evaporator 160 side and supplies it to the indoor heat exchanger 110 side. In the heat pump mode, the auxiliary bypass line R2 is supplied. The refrigerant that has passed is sucked and compressed to be supplied to the indoor heat exchanger (110).

The indoor heat exchanger (110) is installed inside the air conditioning case (150) and is connected to the refrigerant circulation line (R) at the outlet side of the compressor (100), with air flowing in the air conditioning case (150). The refrigerant discharged from the compressor 100 is exchanged.

In addition, the evaporator 160 is installed inside the air conditioning case 150 and connected to the refrigerant circulation line R at the inlet side of the compressor 100, and air flowing in the air conditioning case 150. The refrigerant supplied to the compressor 100 exchanges heat.

The indoor heat exchanger 110, both in the air conditioner mode and the heat pump mode, serves as a condenser,

The evaporator 160 acts as an evaporator in the air conditioner mode and does not supply refrigerant in the heat pump mode.

In addition, the indoor heat exchanger 110 and the evaporator 160 are installed spaced apart from each other within the air conditioning case 150, and the evaporator 160 from the upstream side of the air flow direction in the air conditioning case 150 ) And the indoor heat exchanger 110 are sequentially installed.

Of course, a heater core 220 to be described later is installed between the evaporator 160 and the indoor heat exchanger 110.

Thus, in the air conditioner mode in which the evaporator 160 functions as an evaporator, as shown in FIG. 2, the low-temperature, low-pressure refrigerant discharged from the second expansion means 140 is supplied to the evaporator 160, and at this time, the blower ( Air that flows through the air conditioning case 150 through the evaporator 160 is exchanged with a low-temperature, low-pressure refrigerant inside the evaporator 160 to change to cold air, and then discharged into the vehicle interior. The interior of the car will be cooled.

In the heat pump mode in which the indoor heat exchanger 110 functions as a condenser, as shown in FIG. 3, high-temperature and high-pressure refrigerant discharged from the compressor 100 is supplied to the indoor heat exchanger 110, and at this time, a blower ( After the air flowing inside the air conditioning case 150 through the indoor heat exchanger 110 passes heat exchange with the high temperature and high pressure refrigerant inside the indoor heat exchanger 110 and changes to warm air, the vehicle It is discharged into the room to heat the interior of the vehicle.

And, between the evaporator 160 and the heater core 220 in the air conditioning case 150, the amount of air passing through the heater core 220 and the indoor heat exchanger 110 and the air passing through A temperature control door 151 for adjusting the amount of is installed.

The temperature control door 151 controls the amount of air bypassing the heater core 220 and the indoor heat exchanger 110 and the amount of air passing through the heater core 220 and the indoor heat exchanger 110. By adjusting the temperature of the air discharged from the air conditioning case 150,

At this time, in the air conditioner mode, when the front side passage of the heater core 220 is completely closed through the temperature control door 151 as shown in FIG. 2, cold air passing through the evaporator 160 is heated to the heater core 220 and the room. Since the heat exchanger 110 is bypassed and supplied into the vehicle cabin, maximum cooling is performed,

In the heat pump mode, when the passage for bypassing the heater core 220 is completely closed through the temperature control door 151 as shown in FIG. 3, all air is heated to the heater core 220 and the indoor heat exchanger 110. As it passes through, it is converted into warm air, and since this warm air is supplied into the cabin, maximum heating is performed.

On the other hand, by adjusting the temperature control door 151 as well as maximum cooling and maximum heating, it is possible to control the temperature of air discharged from the air conditioning case 150 into the vehicle cabin.

In addition, while operating in an air conditioner mode and completely closing the passage bypassing the heater core 220 through the temperature control door 151, dehumidification using the evaporator 160 and the indoor heat exchanger 110 are performed. Heating using a refrigerant heat source is possible.

In addition, the outdoor heat exchanger 130 is installed outside the air conditioning case 150 and is connected to the refrigerant circulation line R to exchange heat between the refrigerant circulating the refrigerant circulation line R and the outside air. do.

Here, the outdoor heat exchanger 130 is installed on the front side of the vehicle engine room to exchange heat with the refrigerant flowing inside the outside air.

The outdoor heat exchanger 130 serves as the same condenser as the indoor heat exchanger 110 in the air conditioner mode, where the high temperature refrigerant flowing inside the outdoor heat exchanger 130 exchanges heat with the outside air and condenses. . In the heat pump mode, the refrigerant is not supplied to the outdoor heat exchanger (130), so that the outdoor heat exchanger (130) is prevented from implanting and defrosting is unnecessary.

Meanwhile, when the refrigerant-cooling water heat exchanger 200 is installed at the front end of the outdoor heat exchanger 130, the refrigerant-cooling water heat exchanger 200 is used as a condensation area, and the outdoor heat exchanger 130 is supercooled. It can be used as an area to further improve air conditioning performance.

Then, the first expansion means 120 is installed in the refrigerant circulation line (R) at the outlet side of the indoor heat exchanger 110, discharged from the indoor heat exchanger 110 according to the air conditioner mode or heat pump mode The refrigerant is selectively expanded.

The first expansion means 120 is installed on the refrigerant circulation line (R) on the outlet side of the indoor heat exchanger 110, as shown in Figure 7, the on-off valve 125 to turn on and off the refrigerant flow, the The on-off valve 125 is integrally provided with an orifice 128 to expand the refrigerant, and when the on-off valve 125 is opened, the refrigerant flows in an unexpanded state, and when closed, the orifice 128 The refrigerant is expanded to flow.

In other words, the first expansion means 120 is configured to integrate the on-off valve 125 and the orifice 128 serving as a throttle (expansion).

7 is a view schematically showing the first expansion means 120, a flow path 126 through which a refrigerant flows is formed inside the on-off valve 125, and a valve member to open and close the flow path 126 127).

At this time, an orifice 128 for expanding the refrigerant is formed on the valve member 127.

In addition, a solenoid 129 for opening and closing the valve member 127 is installed on one side of the on-off valve 125.

Therefore, when the valve member 127 of the first expansion means 120 opens the flow path 126, the refrigerant passing through the first expansion means 120 is passed through without expansion, and the first expansion means ( When the valve member 127 of 120) closes the flow path 126, the refrigerant passing through the first expansion means 120 expands in the process of passing through the orifice 128 on the valve member 127 and then passes through it. Will be.

In addition, the second expansion means 140 is installed in the refrigerant circulation line R at the inlet side of the evaporator 160 to expand the refrigerant supplied to the evaporator 160.

That is, the second expansion means 140, in the air conditioner mode, expands the refrigerant discharged from the outdoor heat exchanger 130 to become a low temperature, low pressure liquid (wet saturated) state, and then supplies it to the evaporator 160. Is done.

Various expansion valves such as a mechanical expansion valve (not shown) or an electronic expansion valve (not shown) may be used as the second expansion means 140.

In addition, the refrigerant-cooled water heat exchanger 200 is installed in a refrigerant circulation line (R) between the first expansion means 120 and the outdoor heat exchanger 130, the cooling water circulating the vehicle electrical equipment 205 And the refrigerant circulating in the refrigerant circulation line (R) to exchange heat.

Here, the vehicle electrical equipment 205 includes a battery, an inverter, a motor, and the like.

The refrigerant-cooled water heat exchanger 200, as shown in Figure 6, the radiator 200a and the radiator 200a for cooling the vehicle electrical equipment 205 by heat-exchanging the cooling water circulating the vehicle electrical equipment 205 and the outside air, the radiator 200a It is installed in the header tank (201) of the cooling water flowing through the radiator (200a) and the water cooling heat exchange tube (200b) for heat exchange the refrigerant flowing in the cooling water circulation line (R).

That is, the radiator 200a includes a pair of header tanks 201 spaced apart from each other, a plurality of tubes 202 connecting the pair of header tanks 201, and the plurality of tubes 202. It consists of a heat dissipation fin (203) installed on.

At this time, the first coolant circulation line W1 is connected to the pair of header tanks 201, and the coolant of the electrical appliance 205 flows into the header tank 201 at one side to flow a plurality of tubes 202. In the process, it is cooled by heat exchange with the outside air and then discharged through the other header tank 201. The cooling water discharged from the radiator 200a circulates toward the vehicle electrical equipment 205 to cool the electrical equipment 205.

On the other hand, when a third cooling water circulation line W3 is connected to the refrigerant-cooling water heat exchanger 200, after the refrigerant cooling heat exchanges the engine cooling water flowing through the radiator 200a to flow the water cooling heat exchange tube 200b. Will be discharged.

The water-cooled heat exchange tube 200b is inserted into and installed inside one header tank 201 of the pair of header tanks 201, and is connected to the refrigerant circulation line R. Accordingly, in the air conditioner mode, the header of the radiator 200a in the process of the refrigerant flowing through the first expansion means 120 of the refrigerant circulation line R in the unexpanded state and flowing into the water cooling heat exchange tube 200b. After cooling and condensing by heat-exchanging with the cooling water flowing in the tank 201, it is discharged to the outdoor heat exchanger 130 side.

The refrigerant introduced into the outdoor heat exchanger (130) is cooled again by exchanging heat with outside air and then supercooled and discharged.

On the other hand, the refrigerant-cooled water heat exchanger 200, the outdoor heat exchanger 130 and the engine radiator 215 are installed to overlap in the air flow direction on the front side of the vehicle engine room. That is, after the outside air passes through the refrigerant-cooling water heat exchanger 200, it passes through the outdoor heat exchanger 130 and the engine radiator 215.

And, in the refrigerant circulation line R, a bypass line R1 is installed in parallel so that the refrigerant that has passed through the refrigerant-cooling water heat exchanger 200 bypasses the outdoor heat exchanger 130.

That is, the bypass line R1 connects the refrigerant-side refrigerant circulation line R of the refrigerant-coolant heat exchanger 200 and the refrigerant-side refrigerant circulation line R of the outdoor heat exchanger 130. .

In addition, an on-off valve 180 is installed in the refrigerant circulation line R between the refrigerant-cooled water heat exchanger 200 and the outdoor heat exchanger 130.

In addition, a control unit (not shown) for controlling the heat pump system according to the present invention is provided, the control unit for the refrigerant discharged from the refrigerant-coolant heat exchanger 200 in the air conditioner mode, the outdoor heat exchanger 130 Flow, and in the heat pump mode, the on-off valve 180 is controlled to flow to the bypass line R1 to bypass the outdoor heat exchanger 130.

That is, in the air conditioning mode, the on-off valve 180 is opened, and the refrigerant discharged from the refrigerant-cooling water heat exchanger 200 flows toward the outdoor heat exchanger 130, and in the heat pump mode, the on-off valve ( 180) is closed to bypass the outdoor heat exchanger 130 so that the refrigerant discharged from the refrigerant-cooling water heat exchanger 200 flows toward the bypass line R1.

In addition, inside the air conditioning case 150, a heater core 220 for exchanging air in the air conditioning case 150 and cooling water circulating through the vehicle engine 210 is installed.

The heater core 220 is installed between the evaporator 160 and the indoor heat exchanger 110, and is installed to overlap the indoor heat exchanger 110 in the air flow direction in the air conditioning case 150. .

In addition, an engine radiator 215 for cooling the cooling water circulating in the vehicle engine 210 is installed on the front side of the vehicle.

The engine radiator 215 is an air-cooled heat exchanger to cool the vehicle engine 210 by exchanging coolant circulating the vehicle engine 210 with outside air passing through the engine radiator 215.

In addition, in the present invention, the first, second, and third cooling water circulation lines W1 are used to use cooling water of the vehicle electrical equipment 205 and cooling water of the vehicle engine 210 as heating heat sources according to each mode such as an air conditioner mode and a heat pump mode. , W2, W3) are installed.

The first cooling water circulation line (W1) is configured as a line to connect the vehicle electrical equipment 205 and the refrigerant-cooling water heat exchanger 200, as shown by the thin solid lines in FIGS. 2 and 3, in an air conditioner mode or a heat pump. In the mode, the cooling water discharged from the vehicle electrical equipment 205 is circulated to the refrigerant-cooling water heat exchanger 200.

The second cooling water circulation line (W2) is configured to connect the vehicle engine 210, the heater core 220, and the engine radiator 215 as shown by the thin solid line in FIG. 4, in the heat pump mode. Cooling water discharged from the vehicle engine 210 is circulated to the heater core 220 and the engine radiator 215.

The third cooling water circulation line W3, as shown by the thin solid line in FIG. 5, connects the vehicle engine 210, the heater core 220, the engine radiator 215, and the refrigerant-cooling water heat exchanger 200. By configuring, in the heat pump mode, the cooling water discharged from the vehicle engine 210 is circulated to the heater core 220, the engine radiator 215 and the refrigerant-cooling water heat exchanger 200.

Here, the first, second, and third cooling water circulation lines W1, W2, and W3 have some sections configured as common lines, thereby simplifying the line configuration.

That is, as shown in the drawing, the first, second, and third cooling water circulation lines W1, W2, and W3 have overlapping sections, and thus the first, second, and third cooling water circulation lines W1, W2, and W3 overlap. The section to be made is composed of a single common line, and the section that is not overlapped is composed of a separate line.

In addition, first and second cooling water direction switching valves 190 and 191 are installed at a point where the common line and a separate line diverge to change the flow direction of the refrigerant.

That is, a first cooling water direction switching valve 191 is installed at a branch point of the second and third cooling water circulation lines W2 and W3 located at the outlet side of the engine radiator 215,

A second cooling water direction switching valve 190 is installed at a branch point of the first and third cooling water circulation lines W1 and W3 located on the cooling water outlet side of the refrigerant-cooling water heat exchanger 200.

Therefore, the control unit circulates cooling water through one of the first, second, and third cooling water circulation lines W1, W2, and W3 through control of the first and second cooling water direction switching valves 190 and 191. Is ordered.

As described above, the present invention is to selectively use the heat source of the coolant of the electrical appliance 205 and the coolant of the engine 210 through the first, second, and third cooling water circulation lines W1, W2, and W3.

And, in the refrigerant circulation line (R), the refrigerant discharged from the outdoor heat exchanger (130) or the refrigerant-cooling water heat exchanger (200) bypasses the second expansion means (140) and the evaporator (160). An auxiliary bypass line (R2) connecting the refrigerant circulation line (R) at the inlet side of the second expansion means (140) and the refrigerant circulation line (R) at the outlet side of the evaporator (160) so as to flow to the compressor (100). It is installed.

In addition, at the branch point of the refrigerant circulation line (R) and the auxiliary bypass line (R2), the second expansion means for the refrigerant discharged from the outdoor heat exchanger (130) or refrigerant-cooling water heat exchanger (200) A refrigerant direction switching valve 181 is installed to switch the flow direction of the refrigerant to flow toward the 140 side or flow toward the auxiliary bypass line R2.

That is, the control unit controls the refrigerant direction switching valve 181 so that the refrigerant discharged from the outdoor heat exchanger 130 flows toward the second expansion means 140 in the air conditioner mode, and in the heat pump mode. The refrigerant direction switching valve 181 is controlled so that the refrigerant discharged from the refrigerant-cooling water heat exchanger 200 flows toward the auxiliary bypass line R2.

Meanwhile, a coolant temperature sensor (not shown) is installed on the coolant inlet or outlet side of the coolant-coolant heat exchanger 200.

And, in the heat pump mode, when the coolant temperature of the inlet or outlet side of the coolant-coolant heat exchanger 200 is higher than the outside air temperature, the cooling water of the vehicle electrical appliance 205 is the first coolant circulation line ( W1) to control the first and second cooling water direction switching valves (190,191) to heat the vehicle electrical equipment 205 with cooling water heat source,

When the coolant temperature of the inlet or outlet side of the coolant-coolant heat exchanger 200 is lower than the outside temperature, the first and second coolants of the vehicle engine 210 circulate through the third coolant circulation line W3. The cooling water direction switching valves 190 and 191 are controlled to heat the vehicle engine 210 with a cooling water heat source.

More specifically, the control unit calculates a difference value between the inlet or outlet coolant temperature and the outside temperature of the refrigerant-coolant heat exchanger 200, and when the difference is greater than or equal to a set value, the vehicle electrical appliance 205 is a cooling water heat source. When the difference value is less than the set value, the vehicle engine 210 coolant heat source is used.

Alternatively, in the heat pump mode, when the coolant temperature of the inlet or outlet side of the coolant-coolant heat exchanger 200 is higher than the outside air temperature, the coolant of the vehicle electrical appliance 205 is the first coolant. The first and second cooling water direction switching valves 190 and 191 are controlled to circulate in a circulation line W1 to heat the vehicle electrical equipment 205 with a cooling water heat source.

When the superheat degree of the refrigerant at the outlet side of the compressor 100 is equal to or less than a certain superheat degree, the first and second cooling water direction switching valves (for the cooling water of the vehicle engine 210 to circulate in the third cooling water circulation line W3) ( 190,191) to perform heating with the vehicle engine 210 cooling water heat source.

The superheat is detected by installing a PT sensor on the outlet side of the compressor (100).

In another method, the control unit may set the outside temperature as a criterion when determining whether to use the cooling water heat source for the electrical appliance 205 or the cooling water heat source for the engine 210 in the heat pump mode.

That is, in the heat pump mode, the first and second cooling water direction switching valves 190 and 191 so that the cooling water of the vehicle electrical appliance 205 circulates to the first cooling water circulation line W1 when the outside temperature is higher than the set temperature. ) To perform heating with the cooling water heat source for the vehicle electrical equipment 205,

When the outside air temperature is less than the set temperature, the first and second cooling water direction switching valves 190 and 191 are controlled so that the cooling water of the vehicle engine 210 circulates through the third cooling water circulation line W3. Heating.

The method is applied when the inlet or outlet coolant temperature of the refrigerant-coolant heat exchanger 200 is higher than the inlet or outlet coolant temperature of the refrigerant-coolant heat exchanger 200.

On the other hand, in the heat pump mode, when the coolant temperature at the outlet side of the engine 210 is lower than the ambient temperature, the controller 210 controls the vehicle engine 210 to be operated even in the vehicle's battery driving mode to heat the engine 210 cooling water heat source. Can be used for heating.

That is, when the refrigerant heat source is insufficient in the cryogenic environment or the waste heat of the cooling water is insufficient, the vehicle engine 210 can be driven to allow heating in the cryogenic environment, and a separate electric heating heater is also unnecessary, reducing power consumption and reducing fuel consumption. Can improve.

Then, an accumulator 170 is installed on the refrigerant circulation line R at the inlet side of the compressor 100.

The accumulator 170 separates the liquid refrigerant and the gaseous refrigerant from the refrigerants supplied to the compressor 100 so that only the gaseous refrigerant can be supplied to the compressor 100.

Hereinafter, the operation of the vehicle heat pump system according to the present invention will be described, and representatively, the air conditioner mode, the heat pump mode, and the heat pump mode are in operation, using both the heat source of the coolant and the engine coolant, and the heat pump mode is in operation. Only the mode using only the engine coolant heat source will be described.

end. Air conditioning mode (cooling mode) (Fig. 2)

In the air conditioner mode (cooling mode), in the refrigerant circulation line R, the first expansion means 120 is opened as shown in the right side of FIG. 7 to unexpand the refrigerant, and the second expansion means 140 expands. And the bypass line R1 and the auxiliary bypass line R2 are closed.

In addition, when cooling of the engine 210 is unnecessary or when a cooling water heat source for the engine 210 is unnecessary, the cooling water of the engine 210 is not circulated as shown in FIG. 2. Of course, in the battery driving mode, the engine 210 is also stopped.

In addition, the first cooling water circulation line W1 is operated to circulate the cooling water circulating through the vehicle electrical equipment 205 to the refrigerant-cooling water heat exchanger 200.

On the other hand, in the cooling mode, the temperature control door 151 in the air conditioning case 150 operates to close the passage through the heater core 220 and the indoor heat exchanger 110, and the air conditioning case 150 is blown by the blower. After the air blown into the air is cooled while passing through the evaporator 160, the heater core 220 and the indoor heat exchanger 110 are bypassed and supplied into the vehicle compartment, thereby cooling the vehicle interior.

Continuing, explaining the refrigerant circulation process,

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the compressor 100 is supplied to the indoor heat exchanger 110 installed inside the air conditioning case 150.

As the refrigerant supplied to the indoor heat exchanger 110, as shown in FIG. 2, since the temperature control door 151 closes the indoor heat exchanger 110 side passage, the first expansion means 120 is not directly exchanged with air. It passes through and flows to the refrigerant-cooling water heat exchanger 200.

The refrigerant flowing into the refrigerant-cooling water heat exchanger 200 is condensed by exchanging heat with the cooling water 205 that circulates the first cooling water circulation line W1, and then flows toward the outdoor heat exchanger 130. .

The refrigerant flowing into the outdoor heat exchanger 130 is supercooled while exchanging heat with the outside air.

Subsequently, the refrigerant that has passed through the outdoor heat exchanger 130 expands under reduced pressure in the process of passing through the second expansion means 140 to become a low-temperature, low-pressure liquid refrigerant, and then flows into the evaporator 160.

The refrigerant introduced into the evaporator 160 exchanges heat with air blown into the air conditioning case 150 through a blower to evaporate, and at the same time, cools the air by absorbing heat due to latent heat of evaporation of the refrigerant. It is supplied to the vehicle interior and cooled.

Thereafter, the refrigerant discharged from the evaporator 160 recirculates the cycle as described above while flowing into the compressor 100.

On the other hand, when the temperature control door 151 is adjusted, it is possible to control the temperature of the air supplied into the vehicle cabin.

I. Heat pump mode (heating mode) (Fig. 3)

In the heat pump mode, in the refrigerant circulation line R, the first expansion means 120 is closed as shown in the left side of FIG. 7 to expand the refrigerant, and the second expansion means 140 closes the refrigerant flow path, and the The bypass line R1 and the auxiliary bypass line R2 are opened.

In addition, in a condition in which the cooling water heat source of the vehicle electrical equipment 205 can be used, the first cooling water circulation line W1 is operated to circulate the cooling water discharged from the vehicle electrical equipment 205 to the refrigerant-cooling water heat exchanger 200 Is done.

And, in the heat pump mode, the temperature control door 151 in the air conditioning case 150 operates to close the passages bypassing the heater core 220 and the indoor heat exchanger 110, and the air conditioning case ( 150) After the air blown through the evaporator 160 (stop operation) passes through the heater core 220 and the indoor heat exchanger 110, it is converted into warm air and supplied into the vehicle cabin to heat the vehicle interior. do.

Continuing, explaining the refrigerant circulation process,

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the compressor 100 flows into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature and high-pressure gaseous refrigerant flowing into the indoor heat exchanger 110 condenses while exchanging heat with air blown into the air-conditioning case 150 through a blower, and the air passing through the indoor heat exchanger 110 is condensed. After changing to warm air, it is supplied to the vehicle interior to heat the interior of the vehicle.

Subsequently, the refrigerant discharged from the indoor heat exchanger 110 expands under reduced pressure in the process of passing through the first expansion means 120 to become a low-temperature low-pressure liquid refrigerant, and then to the refrigerant-cooling water heat exchanger 200. Inflow.

The refrigerant flowing into the refrigerant-cooling water heat exchanger 200 is discharged after being evaporated while exchanging heat with the cooling water of the electrical appliance 205 flowing through the first cooling water circulation line W1.

After the refrigerant discharged from the refrigerant-cooling water heat exchanger 200 flows along the auxiliary bypass line R2, the second expansion means 140 and the evaporator 160 are bypassed, and then the compressor 100 ) Is recycled as described above.

All. Mode that uses both the heat source of the electrical equipment coolant and the engine coolant during the heat pump mode operation (Fig. 4),

During the heat pump mode operation, a mode that uses both the heat source of the coolant of the electrical appliance 205 and the coolant of the engine 210 is used as the heat source of the coolant heat of the electrical appliance 205 as well as the engine 210 coolant heat source while operating in the heat pump mode. As the case (or when engine cooling is required), the cooling water discharged from the vehicle electrical components 205 by operating the first and second cooling water circulation lines W1 and W2 as shown in FIG. 4 is the refrigerant-cooling water heat exchanger 200 ), And the cooling water discharged from the vehicle engine 210 is circulated to the heater core 220 and the engine radiator 215.

Thus, the air that has passed through the evaporator 160 passes through the heater core 220 and the indoor heat exchanger 110, where the air is engine cooling water and the indoor heat exchanger 110 of the heater core 220. It is heated while heat exchange with the refrigerant.

Thereafter, the warm air that has passed through the heater core 220 and the indoor heat exchanger 110 is supplied to the vehicle cabin to be heated.

Meanwhile, the refrigerant circulating in the refrigerant circulation line (R) is evaporated by exchanging heat with the coolant of the electrical appliance 205 in the refrigerant-coolant heat exchanger (200).

In addition, the cooling water discharged from the engine 210 is cooled while circulating the heater core 220 and the engine radiator 215 along the second cooling water circulation line W2.

On the other hand, the mode of using both the heat source of the coolant and the engine coolant during the heat pump mode operation, except that the engine 210 coolant is additionally circulated through the second coolant circulation line W2 in the heat pump mode of FIG. 3. Since it is the same as the heat pump mode, repeated description is omitted.

la. Mode that uses only engine cooling water heat source during heat pump mode operation (Fig. 5),

The mode in which only the engine cooling water heat source is used during the heat pump mode operation is a case where only the cooling water heat source of the engine 210 is to be used during the operation in the heat pump mode, and the third cooling water circulation line W3 is operated as shown in FIG. 5. Cooling water discharged from the vehicle engine is circulated to the heater core 220, the engine radiator 215, and the refrigerant-cooling water heat exchanger 200.

Thus, the air that has passed through the evaporator 160 passes through the heater core 220 and the indoor heat exchanger 110, where the air is engine cooling water and the indoor heat exchanger 110 of the heater core 220. It is heated while heat exchange with the refrigerant.

Thereafter, the warm air that has passed through the heater core 220 and the indoor heat exchanger 110 is supplied to the vehicle cabin to be heated.

In addition, the cooling water discharged from the engine 210 is cooled while circulating the heater core 220, the engine radiator 215, and the refrigerant-cooling water heat exchanger 200 along the third cooling water circulation line W3. .

Continuing, explaining the refrigerant circulation process,

The high temperature and high pressure gaseous refrigerant discharged after being compressed by the compressor 100 flows into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature and high-pressure gaseous refrigerant flowing into the indoor heat exchanger 110 condenses while exchanging heat with air blown into the air-conditioning case 150 through a blower, and the air passing through the indoor heat exchanger 110 is condensed. After changing to warm air, it is supplied to the vehicle interior to heat the interior of the vehicle.

Subsequently, the refrigerant discharged from the indoor heat exchanger 110 expands under reduced pressure in the process of passing through the first expansion means 120 to become a low-temperature low-pressure liquid refrigerant, and then to the refrigerant-cooling water heat exchanger 200. Inflow.

The refrigerant flowing into the refrigerant-cooling water heat exchanger 200 is discharged after being evaporated while exchanging heat with the cooling water of the engine 210 flowing in the third cooling water circulation line W1.

After the refrigerant discharged from the refrigerant-cooling water heat exchanger 200 flows along the auxiliary bypass line R2, the second expansion means 140 and the evaporator 160 are bypassed, and then the compressor 100 ) Is recycled as described above.

100: compressor 110: indoor heat exchanger
120: first expansion means
130: outdoor heat exchanger 140: second expansion means
150: air conditioning case 151: temperature control door
160: evaporator 170: accumulator
180: on-off valve 181: refrigerant direction switching valve
190: 1st cooling water direction switching valve 191: 2nd cooling water direction switching valve
200: refrigerant-cooling water heat exchanger
200a: radiator 200b: water cooled heat exchange tube
205: electrical equipment 210: engine
215: engine radiator 220: heater core
R: Refrigerant circulation line R1: Bypass line
R2: Auxiliary bypass line W1: First coolant circulation line
W2: Second cooling water circulation line W3: Third cooling water circulation line

Claims (14)

A compressor 100 installed on the refrigerant circulation line (R) for compressing and discharging refrigerant, and installed inside the air conditioning case 150 to cool the air in the air conditioning case 150 and the refrigerant discharged from the compressor 100 An indoor heat exchanger (110) for heat exchange, an evaporator (160) installed inside the air conditioning case (150) to exchange air in the air conditioning case (150) and the refrigerant supplied to the compressor (100), and the air conditioning case Installed on the outside of the (150), the outdoor heat exchanger (130) for heat exchange between the refrigerant circulating the refrigerant circulation line (R) and the outside air, and installed on the outlet side refrigerant circulation line (R) of the indoor heat exchanger (110) The first expansion means 120 to selectively expand the refrigerant discharged from the indoor heat exchanger 110, and the refrigerant installed in the refrigerant circulation line R at the inlet side of the evaporator 160 and supplied to the evaporator 160 Vehicle heat comprising a second expansion means 140 for expanding the In the pump system,
Refrigerant circulation line (R) between the first expansion means 120 and the outdoor heat exchanger (130) is a refrigerant for circulating the coolant circulating the vehicle electrical equipment (205) and the refrigerant circulating the refrigerant circulation line (R)- A cooling water heat exchanger 200 is installed, and a bypass line R1 is provided in the refrigerant circulation line R so that refrigerant passing through the refrigerant-cooling water heat exchanger 200 bypasses the outdoor heat exchanger 130. Installed,
An on-off valve 180 is installed in the refrigerant circulation line R between the refrigerant-cooling water heat exchanger 200 and the outdoor heat exchanger 130, and the refrigerant discharged from the refrigerant-cooling water heat exchanger 200 is installed. In the air conditioner mode, the on-off valve 180 is controlled to flow to the outdoor heat exchanger 130 side and to the bypass line R1 side to bypass the outdoor heat exchanger 130 in the heat pump mode. The control unit is provided,
A heater core 220 for exchanging air in the air conditioning case 150 and cooling water circulating in the vehicle engine 210 is installed inside the air conditioning case 150, and the vehicle engine 210 is installed on the front side of the vehicle. An engine radiator 215 for cooling the circulating coolant is installed,
A first cooling water circulation line (W1) constituting a line to circulate the refrigerant-cooling water heat exchanger (200) from the vehicle electrical equipment (205), and the cooling water discharged from the vehicle engine (210) to the heater A second cooling water circulation line (W2) constituting a line to circulate the core 220 and the engine radiator 215, and cooling water discharged from the vehicle engine 210 are the heater core 220 and the engine radiator ( 215) and a third cooling water circulation line (W3) constituting a line to circulate the refrigerant-cooling water heat exchanger (200), wherein the first, second and third cooling water circulation lines (W1, W2, W3) are: A heat pump system for a vehicle, characterized in that some sections consist of a common line. delete delete delete According to claim 1,
A first cooling water direction switching valve 191 is installed at a branch point of the second and third cooling water circulation lines W2 and W3 located at the outlet side of the engine radiator 215,
A second cooling water direction switching valve 190 is installed at a branch point of the first and third cooling water circulation lines W1 and W3 located at the cooling water outlet side of the refrigerant-cooling water heat exchanger 200,
The control unit, through the control of the first and second cooling water direction switching valve (190,191), to circulate the cooling water to one of the cooling water circulation line of the first, second and third cooling water circulation line (W1, W2, W3) Vehicle heat pump system characterized in that the control. The method of claim 5,
The control unit, in the heat pump mode, when the coolant temperature of the inlet or outlet side of the refrigerant-coolant heat exchanger 200 is higher than the outside temperature, the cooling water of the vehicle electrical appliance 205 is the first coolant circulation line (W1) The first and second cooling water direction switching valves 190 and 191 are controlled so as to circulate therewith, and heating is performed with a cooling water heat source for the vehicle electrical equipment 205,
When the coolant temperature of the inlet or outlet side of the coolant-coolant heat exchanger 200 is lower than the outside temperature, the first and second coolants of the vehicle engine 210 circulate through the third coolant circulation line W3. A heat pump system for a vehicle, characterized in that, by controlling the cooling water direction switching valves (190, 191), the vehicle engine 210 performs heating with a cooling water heat source. The method of claim 5,
The control unit, in the heat pump mode, when the coolant temperature of the inlet or outlet side of the refrigerant-coolant heat exchanger 200 is higher than the outside temperature, the cooling water of the vehicle electrical appliance 205 is the first coolant circulation line (W1) The first and second cooling water direction switching valves 190 and 191 are controlled to circulate to perform heating with the vehicle electrical equipment 205 cooling water heat source,
When the superheat degree of the refrigerant at the outlet side of the compressor 100 is equal to or less than a certain superheat degree, the first and second cooling water direction switching valves (for the cooling water of the vehicle engine 210 to circulate in the third cooling water circulation line W3) ( 190,191) to control the vehicle engine 210 to heat the vehicle heat pump system, characterized in that to perform heating with a heat source. The method of claim 5,
The control unit, in the heat pump mode, if the outside temperature is above the set temperature, the first and second cooling water direction switching valves 190 and 191 to circulate the cooling water of the vehicle electrical equipment 205 to the first cooling water circulation line W1. Heating by controlling the vehicle electrical equipment 205 with a cooling water heat source,
When the outside air temperature is less than the set temperature, the first and second cooling water direction switching valves 190 and 191 are controlled so that the cooling water of the vehicle engine 210 circulates through the third cooling water circulation line W3. Heat pump system for a vehicle, characterized in that to perform heating. According to claim 1,
The refrigerant-cooled water heat exchanger 200 includes a radiator 200a for cooling the vehicle electrical equipment 205 by heat-exchanging the cooling water circulating in the vehicle electrical equipment 205 with outside air, and a header tank 201 of the radiator 200a A heat pump system for a vehicle, comprising a water-cooled heat exchange tube (200b) installed in a heat exchanger for cooling water flowing through the radiator (200a) and refrigerant flowing through the refrigerant circulation line (R). According to claim 1,
The refrigerant-cooled water heat exchanger (200), the outdoor heat exchanger (130) and the engine radiator (215), a vehicle heat pump system, characterized in that installed in the air flow direction superimposed on the front side of the vehicle engine room. According to claim 1,
In the refrigerant circulation line (R), the refrigerant discharged from the outdoor heat exchanger (130) or the refrigerant-cooling water heat exchanger (200) bypasses the second expansion means (140) and the evaporator (160) so that the compressor ( 100), an auxiliary bypass line (R2) connecting the refrigerant circulation line (R) at the inlet side of the second expansion means 140 and the refrigerant circulation line (R) at the outlet side of the evaporator 160 is installed. Vehicle heat pump system characterized in that. The method of claim 11,
At the branching point of the refrigerant circulation line (R) and the auxiliary bypass line (R2), the second expansion means 140 for the refrigerant discharged from the outdoor heat exchanger (130) or the refrigerant-cooling water heat exchanger (200) ), Or a heat transfer system for a vehicle, characterized in that a refrigerant direction switching valve (181) is installed to switch the flow direction of the refrigerant to flow toward the auxiliary bypass line (R2). According to claim 1,
The first expansion means 120,
It is installed on the refrigerant circulation line (R) at the outlet side of the indoor heat exchanger (110) to turn on and off the refrigerant flow, and the on-off valve (125) is integrally provided with the on-off valve (125) to expand the refrigerant Consists of an orifice (128),
When the on-off valve 125 is opened, the coolant flows in an unexpanded state, and when closed, the coolant is pumped through the orifice (128) to flow through the vehicle. According to claim 1,
The heater core 220, a heat pump system for a vehicle, characterized in that installed between the evaporator 160 and the indoor heat exchanger (110).

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