KR102556958B1 - Air conditioning system for vehicles with improving energy efficiency - Google Patents

Abstract

An air conditioning system for a vehicle according to an embodiment of the present invention includes a compressor, a condenser, an expansion valve, and an evaporator to circulate the refrigerant to adjust the temperature in the vehicle, and the compressor by first boosting the refrigerant passing through the evaporator. and a circulation control unit that controls the circulation of refrigerant between the cooler and the supercharger by controlling the operation of the supercharger and the cooler and the supercharger.

Description

Vehicle air conditioning system with improved energy efficiency {AIR CONDITIONING SYSTEM FOR VEHICLES WITH IMPROVING ENERGY EFFICIENCY}

The present invention relates to an air conditioning system for vehicles, and more particularly, to an air conditioning system for vehicles in which energy efficiency is improved by linking an air conditioner with an electric supercharger.

In general, an air conditioning system for a vehicle is a device for cooling or heating a vehicle in the process of introducing air outside the vehicle into the interior of the vehicle or circulating air inside the vehicle. Here, the air conditioner of the vehicle air conditioning system goes through a process of 'compression→condensation→expansion→evaporation' to deliver the cooled air to the interior of the vehicle.

However, in order to drive the refrigeration cycle of the air conditioner, a large amount of energy is consumed in the process of forcibly circulating the refrigerant because the compressor is driven using external power such as engine driving force or electric power. In other words, in order to compress the low-temperature, low-pressure gaseous refrigerant moving from the evaporator of the air conditioner to the condenser, a large driving force is required from the compressor.

As prior literature related to the present invention, there is Republic of Korea Patent Publication No. 10-2018-0036126 (published on April 9, 2018), which discloses a technology related to a vehicle cooling system.

The present invention provides a vehicle air conditioning system capable of improving energy efficiency by minimizing heat generation of the supercharger and reducing the number of revolutions per minute of a compressor by linking an air conditioner with an electric supercharger.

The problem to be solved by the present invention is not limited to the above-mentioned problems, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

An air conditioning system for a vehicle having improved energy efficiency according to an embodiment of the present invention includes a cooler having a compressor, a condenser, an expansion valve, and an evaporator to adjust the temperature in the vehicle by circulating a refrigerant; a supercharger for first increasing the pressure of the refrigerant passing through the evaporator and delivering the refrigerant to the compressor; and a circulation control unit controlling the circulation of the refrigerant between the air conditioner and the supercharger by controlling the operation of the air conditioner and the supercharger.

When the supercharger is operating and the air conditioner is not operating, the circulation control unit may open a connection path between the air conditioner and the supercharger to control refrigerant of the air conditioner to flow into the supercharger.

The circulation controller may control the refrigerant to be circulated only in the air conditioner when the air conditioner operates and the supercharger does not operate.

The circulation control unit may drive the compressor at a relatively lower revolution per minute when the air conditioner and the supercharger are operated in parallel than when only the air conditioner is operated.

The circulation control unit includes a refrigerant line connecting the evaporator, the compressor, and the supercharger to a single conduit to enable refrigerant circulation; a pressure sensor for sensing the pressure of the refrigerant circulating in the refrigerant line; an opening/closing means provided in the refrigerant line to adjust the flow rate of the refrigerant; and a controller electronically controlling the opening and closing means to open and close the refrigerant line according to the pressure of the refrigerant sensed by the pressure sensor.

The opening/closing means may be provided in each section where the supercharger is connected to the evaporator and the compressor.

The opening and closing means may be a 3-way valve.

The refrigerant line includes a first branch pipe connecting the outlet of the evaporator and the inlet of the supercharger; a second branch pipe connecting the outlet of the evaporator and the inlet of the compressor; and a third branch pipe connecting the outlet of the supercharger and the second branch pipe, wherein the opening and closing means is a first three-way valve cross-connecting the outlet of the evaporator, the first branch pipe, and the second branch pipe. and a second three-way valve cross-connecting the second branch pipe, the third branch pipe, and the inlet of the compressor.

The second three-way valve controls the circulation of the refrigerant so that the refrigerant in the second branch pipe and the refrigerant in the third branch pipe are introduced into the compressor in a mixed state.

An air conditioning system for a vehicle having improved energy efficiency according to another embodiment of the present invention includes a cooler having a compressor, a condenser, an expansion valve, and an evaporator to adjust the temperature in the vehicle by circulating a refrigerant; a supercharger for first increasing the pressure of the refrigerant passing through the evaporator and delivering the refrigerant to the compressor; and a circulation control unit that individually controls the operation of the air conditioner and the supercharger to selectively adjust the circulation of the refrigerant between the air conditioner and the supercharger.

According to the present invention, heat generation of the supercharger can be minimized and the number of revolutions per minute of the compressor can be reduced by linking the air conditioner with the electric supercharger.

Accordingly, the present invention can reduce the compressor work of the air conditioner and increase the operating time of the supercharger.

1 is a view for simply explaining an air conditioning system for a vehicle having improved energy efficiency according to an embodiment of the present invention.
2 is an operational relationship diagram showing how an air conditioner and a supercharger are simultaneously operated in an air conditioning system for a vehicle with improved energy efficiency according to an embodiment of the present invention.
3 is an operational relationship diagram illustrating how only an air conditioner is operated in an air conditioning system for a vehicle with improved energy efficiency according to an embodiment of the present invention.
4 is an operational relationship diagram illustrating how only a supercharger is operated in an air conditioning system for a vehicle having improved energy efficiency according to an embodiment of the present invention.
5 is a Molière diagram showing a comparison between when the air conditioner and the supercharger are operated simultaneously and when only the air conditioner is operated in the vehicle air conditioning system with improved energy efficiency according to an embodiment of the present invention.

Terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, and the inventors may properly define the concept of terms in order to best describe their invention. According to the principle that it can be, it should be interpreted as meaning and concept consistent with the technical spirit of the present invention. In addition, the embodiments described in this specification and the configurations shown in the drawings are only preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, so various equivalents that can replace them at the time of the present application It should be understood that there may be waters and variations.

Hereinafter, an air conditioning system for a vehicle with improved energy efficiency according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram for simply explaining an air conditioning system for a vehicle having improved energy efficiency according to an embodiment of the present invention.

In general, an air conditioning system for a vehicle may cool or heat the vehicle 1 in the process of circulating the air after introducing air outside the vehicle 1 into the room. The system 10 will be described focusing on contents related to configurations made in the cooling process.

The vehicle air conditioning system 10 has a configuration capable of minimizing heat generation of the supercharger 200 by linking the air conditioner 100 with the electric supercharger 200. To this end, the vehicle air conditioning system 10 includes an air conditioner 100, a supercharger 200, and a circulation control unit 300.

The air conditioner 100 is a device capable of lowering the temperature inside the vehicle 1 or maintaining it in a comfortable state. At this time, the air conditioner 100 has a structure capable of lowering the indoor temperature in the vehicle 1 and the heating temperature of the supercharger 200.

The supercharger 200 is a device that increases the supercharged amount of air in order to increase the efficiency of the engine of the vehicle 1. At this time, the supercharger 200 sucks exhaust gas or outside air to increase the output of the engine of the vehicle 1, turns the turbine, and supplies the resulting high-temperature compressed air into a cylinder (not shown). .

In general, a separate intercooler (not shown) is often provided to lower the heating temperature of the supercharger 200 and improve performance.

However, the present invention has a technical feature of using the refrigerant of the air conditioner 100 without the need to additionally configure a separate part such as an intercooler to lower the heating temperature of the supercharger 200.

Accordingly, the present invention provides an advantage of further simplifying the manufacturing process and reducing component costs. In addition, the supercharger 200 can lower the temperature of parts that generate heat, thereby preventing a delay in operating time due to heat generation.

As a result, the vehicle air conditioning system 10 according to an embodiment of the present invention does not require a separate cooling water circulation system for cooling the supercharger 200, and thus the number of parts and manufacturing and installation costs can be reduced.

The circulation control unit 300 may selectively adjust refrigerant circulation of the air conditioner 100 and the supercharger 200 by controlling the air conditioner 100 and the supercharger 200 . By the operation logic of the circulation control unit 300, the driving efficiency of the air conditioner 100 can be increased and heat generation of the supercharger 200 can be minimized.

Explanation of the relationship between configurations in which the air conditioner and supercharger operate in parallel

2 is an operational relationship diagram illustrating how an air conditioner and a supercharger are simultaneously operated in an air conditioning system for a vehicle with improved energy efficiency according to an embodiment of the present invention.

Referring to FIG. 2 , an air conditioning system 10 for a vehicle with improved energy efficiency according to an embodiment of the present invention largely includes an air conditioner 100, a supercharger 200, and a circulation control unit 300.

First, each configuration of the vehicle air conditioning system 10 having improved energy efficiency according to an embodiment of the present invention will be described.

The air conditioner 100 is a device that circulates a refrigerant by including a compressor 110, a condenser 130, an expansion valve 150, and an evaporator 170, and lowers the indoor temperature in the vehicle and the heating temperature of the supercharger 200. can

The compressor 110 is a mechanical device that compresses gaseous refrigerant to increase pressure, and is also referred to as a compressor. Since the compressor 110 needs to convert low-pressure gaseous refrigerant into relatively high-pressure gaseous refrigerant, power consumption inevitably increases as the pressure of the refrigerant introduced therein decreases.

The condenser 130 is a device for liquefying a gaseous refrigerant, and is also referred to as a condenser. The condenser 130 may convert the high-temperature and high-pressure refrigerant that has passed through the compressor 110 into a liquid state and discharge it.

The expansion valve 150 depressurizes the high-temperature and high-pressure liquid refrigerant condensed and liquefied in the condenser 130 to a value required for evaporation. At this time, the expansion valve 150 may control and supply an appropriate amount of refrigerant to absorb sufficient heat from the evaporator 170 through a throttling action of narrowing the cross-sectional area of the refrigerant circulation.

The evaporator 170 passes through the expansion valve 150 and introduces the liquid refrigerant reduced to a low temperature and low pressure, thereby exchanging heat with the interior of the vehicle or the supercharger 200, thereby converting the liquid refrigerant into a gaseous state and discharging it. .

The supercharger 200 is connected to the air conditioner 100 to enable circulation of the refrigerant. Such a supercharger 200 can absorb heat from the refrigerant of the air conditioner 100 to lower the temperature of a heating part due to driving. That is, the supercharger 200 is connected so that the refrigerant circulates between the evaporator 170 and the compressor 110, and heat generation of a motor (not shown) and a bearing (not shown) provided therein can be eliminated. .

The circulation control unit 300 is electrically connected to the air conditioner 100 and the supercharger 200. So, the circulation control unit 300 can control the operation of the air conditioner 100 and the supercharger 200.

The circulation control unit 300 controls the operation of the air conditioner 100 and the supercharger 200 in parallel or separately to selectively control the circulation of the refrigerant between the air conditioner 100 and the supercharger 200.

The circulation control unit 300 is responsible for an electronic control unit (ECU) function that controls all parts of the vehicle, such as an automatic transmission control, a driving system, a braking system, and a steering system.

The circulation control unit 300 may include a refrigerant line 310, a pressure sensor 330, an opening/closing means 350, and a controller 370.

The refrigerant line 310 connects the evaporator 170, the compressor 110, and the supercharger 200 through a single conduit so that the refrigerant circulates.

The refrigerant line 310 includes a first branch pipe 311 , a second branch pipe 313 and a third branch pipe 315 .

The first branch pipe 311 connects the outlet of the evaporator 170 and the inlet of the supercharger 200. The second branch pipe 313 connects the outlet of the evaporator 170 and the inlet of the supercharger 200 . The third branch pipe 315 connects the outlet of the supercharger 200 and the second branch pipe 313.

The pressure sensor 330 senses the pressure of the refrigerant circulating in the refrigerant line 310 . At this time, the pressure sensor 330 may be disposed in plurality for each section of the refrigerant line 310 .

The opening/closing means 350 is provided in the refrigerant line 310 to adjust the flow rate of the refrigerant. At this time, the opening and closing means 350 may be formed of a three-way valve having holes in three directions.

The opening/closing means 350 includes a first three-way valve 351 and a second three-way valve 353. The first three-way valve 351 cross-connects the outlet of the evaporator 170, the first branch pipe 311 and the second branch pipe 313. The second three-way valve 353 cross-connects the inlets of the second branch pipe 313 , the third branch pipe 315 , and the compressor 110 .

The controller 370 may electronically control the opening and closing means 350 to open and close the refrigerant line 310 according to the pressure of the refrigerant sensed by the pressure sensor 330 .

Next, an operating relationship between components in which the air conditioner 100 and the supercharger 200 are simultaneously operated in the vehicle air conditioning system 10 with improved energy efficiency according to an embodiment of the present invention will be examined.

Prior to this, a brief glossary of terms will be provided. The first refrigerant circulation passage C1 is provided between the compressor 110 and the condenser 130 and is a connection passage through which the refrigerant can circulate. The second refrigerant circulation path (C2) is provided between the condenser 130 and the expansion valve 150 and is a connection path through which the refrigerant can circulate. The third refrigerant circulation path (C3) is provided between the expansion valve 150 and the evaporator 170 and is a connection path through which the refrigerant can circulate. The first, second, and third refrigerant circulation passages C1, C2, and C3 may be configured to be through-connected through a single conduit.

Referring to FIG. 2 , in the air conditioning system 10 according to an embodiment of the present invention, an air conditioner 100 and a supercharger 200 are linked, and a circulation control unit 300 controls the air conditioner 100 and the supercharger 200 ) to control the operation of

The compressor 110 transfers the high-temperature and high-pressure gaseous refrigerant to the condenser 130 through the first refrigerant circulation path C1. The condenser 130 converts the gaseous refrigerant introduced from the condenser 130 into a high-temperature and high-pressure liquid refrigerant and transfers the converted gaseous refrigerant to the expansion valve 150 .

At this time, the expansion valve 150 reduces the high-temperature and high-pressure liquid refrigerant to a required value in the evaporator 170 . In other words, the expansion valve 150 reduces the high-temperature and high-pressure liquid refrigerant to a pressure capable of causing evaporation by a throttling action.

The evaporator 170 converts the low-temperature, low-pressure wet steam refrigerant introduced from the expansion valve 150 into a low-temperature, low-pressure gaseous state and discharges the refrigerant. The low-temperature, low-pressure gaseous refrigerant discharged from the evaporator 170 is transferred to the supercharger 200 through the first branch pipe 311 .

At this time, the supercharger 200 firstly increases the pressure of the refrigerant that has passed through the evaporator 170 and delivers it to the compressor 110 . The reason for increasing the pressure of the refrigerant in the supercharger 200 is to lower the heating temperature of the supercharger 200, and secondly, to improve energy efficiency by reducing the compression work of the compressor 110.

In other words, since the refrigerant discharged from the evaporator 170 is in a low-temperature, low-pressure gaseous state, if the refrigerant is directly delivered to the compressor 110 without passing through the supercharger 200, the compression work of the compressor 110 is can only increase In addition, since the refrigerant is not delivered to the supercharger 200, the heating temperature of the supercharger 200 cannot be lowered.

For this reason, the supercharger 200 increases the pressure of the low-temperature, low-pressure gaseous refrigerant discharged from the evaporator 170 to a medium-temperature and medium-pressure gaseous refrigerant and transfers the pressure to the compressor 110 . As a result, the supercharger 200 may play an auxiliary role of the compressor 110 by primarily performing compression required by the compressor 110 .

In the supercharger 200, self-heating temperature may be reduced during the primary pressure boosting process. It is important to lower the heating temperature of the supercharger 200 because the lower the temperature of the air sucked into the engine, the better. This is because the air density decreases as the temperature increases, and for the same volume, as the temperature increases, the actual compression ratio decreases and the amount of oxygen contained decreases.

As a result, the supercharger 200 converts the low-temperature and low-pressure gaseous refrigerant delivered from the evaporator 170 into a medium-temperature and medium-pressure pressure, and transfers it to the compressor 110 . As a result, the number of revolutions per minute of the compressor 110 is reduced, and the amount of work required for compressing the refrigerant is reduced.

The refrigerant of the second branch pipe 313 and the refrigerant of the third branch pipe 315 may be introduced into the compressor 110 in a mixed state.

In the refrigerant line 310 including the first, second, and third refrigerant circulation passages C1, C2, and C3 and the first, second, and third branch pipes 311, 313, and 315, which are sections in which the refrigerant circulates, a plurality of pressure Preferably, the sensor 330 is provided.

The pressure sensor 330 detects the pressure of the circulating refrigerant and transmits the detected refrigerant pressure value to the controller 370 .

The controller 370 compares the refrigerant pressure value transmitted from the pressure sensor 330 with the refrigerant pressure value of each preset section, and then switches the first three-way valve 351 and the second three-way valve according to whether the reference value is met. (353) is electronically controlled to open and close.

Here, the refrigerant pressure value of each section preset is a refrigerant value set in advance according to the working environment, and may vary according to the situation of each section in which the refrigerant circulates.

Describe the relationship between configurations where only the air conditioner is operating

3 is an operational relationship diagram illustrating how only an air conditioner is operated in an air conditioning system for a vehicle with improved energy efficiency according to an embodiment of the present invention.

Referring to FIG. 3, in the vehicle air conditioning system 10 with improved energy efficiency according to an embodiment of the present invention, when the supercharger 200 is not driven, there is no need to cool the supercharger 200, so the air conditioner ( 100) can be driven.

At this time, the controller 370 of the circulation control unit 300 controls the path of the refrigerant circulated from the air conditioner 100 to the supercharger 200 through the first three-way valve 351 and the second three-way valve 353. It can be blocked and controlled so that the refrigerant circulates only within the air conditioner 100.

That is, when only the air conditioner 100 operates and the supercharger 200 stops operating, the controller 370 directly transfers the refrigerant from the evaporator 170 to the compressor 110 without passing through the supercharger 200 , the first three-way valve 351 and the second three-way valve 353 are opened in the direction of the air conditioner 100.

At the same time, the controller 370 closes the first three-way valve 351 and the second three-way valve 353 connected to the supercharger 200 to block the section connected to the supercharger 200. At this time, the low-temperature, low-pressure gaseous refrigerant discharged from the evaporator 170 is transferred to the compressor 110 .

Describe the relationship between configurations where only the supercharger works

4 is an operational relationship diagram showing how only a supercharger is operated in an air conditioning system for a vehicle with improved energy efficiency according to an embodiment of the present invention.

Referring to FIG. 4 , in the vehicle air conditioning system 10 with improved energy efficiency according to an embodiment of the present invention, when only the supercharger 200 is operated in a state in which the air conditioner 100 is not operating, the air conditioner 100 The refrigerant of may be introduced into the supercharger 200. To this end, the circulation control unit 300 opens a connection path between the air conditioner 100 and the supercharger 200. In other words, the controller 370 of the circulation control unit 300 electronically controls and opens the first three-way valve 351 and the second three-way valve 353 .

At this time, since the air conditioner 100 is configured to circulate the refrigerant in an idle state, a circulation process in which the refrigerant passing through the supercharger 200 flows into the compressor 110 may proceed. Through this, the present invention can reduce a series of work for the refrigerant pressure when operating the cooler 100 later.

5 is a Molière diagram showing a comparison between when an air conditioner and a supercharger are operated simultaneously and when only an air conditioner is operated in an air conditioning system for a vehicle with improved energy efficiency according to an embodiment of the present invention.

In order to clearly describe FIG. 5, FIGS. 2 and 3 will be referred to together.

As shown in FIG. 5, enthalpy (H) is displayed on the horizontal axis of the Moleir diagram, and pressure (P) is displayed on the vertical axis.

From point F to point A, the refrigerant is compressed into a medium-temperature, medium-pressure gas, and from point A to point B, the refrigerant is compressed into a high-temperature, high-pressure gas. From point B to point C, the high-temperature, high-pressure gaseous refrigerant becomes a high-temperature, high-pressure liquid refrigerant, and from point C to point D, the refrigerant becomes low-temperature, low-pressure wet steam. From point D to point E or from point D to point F, the refrigerant becomes a low-temperature, low-pressure gas, and from point E to point A, the low-temperature, low-pressure gaseous refrigerant becomes a medium-temperature, medium-pressure gaseous refrigerant.

As shown in FIG. 3 , when only the air conditioner 100 is operated, the compressor 110 must compress the low-temperature, low-pressure gaseous refrigerant into the high-temperature, high-pressure gaseous refrigerant by an area from point F to point B.

On the other hand, as shown in FIG. 2, when the air conditioner 100 and the supercharger 200 are operated simultaneously, the amount of work for the compressor 110 to compress the refrigerant is the area from point A to point B shown in FIG. as much as That is, the workload of the compressor 110 is reduced as the pressure of the low-temperature, low-pressure gaseous refrigerant is first increased to the medium-temperature and medium-pressure gaseous refrigerant through the supercharger 200 .

Since enthalpy (H) decreases in an exothermic reaction and enthalpy (H) increases in an endothermic reaction, when the refrigerant of the air conditioner 100 passes through the supercharger 200, the supercharger (200 ) to compress the refrigerant.

In other words, in the vehicle air conditioning system 10 according to an embodiment of the present invention, when the air conditioner 100 and the supercharger 200 are operated simultaneously, the refrigerant is supplied from the supercharger 200 from point E to point A in FIG. 5 . Since the pressure is first increased, it is only necessary to compress the compressor 110 from point A to point B. Therefore, power consumption of the compressor 110 can be reduced.

As described above, the present invention has the effect of improving energy efficiency by minimizing heat generation of the supercharger and reducing the number of revolutions per minute of the compressor by linking the air conditioner with the electric supercharger.

Accordingly, the present invention can reduce the compressor work of the air conditioner and increase the operating time of the supercharger.

In the above, the vehicle air conditioning system with improved energy efficiency according to a preferred embodiment of the present invention has been looked at.

It should be understood that the foregoing embodiments are illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims to be described later, and all changes and modifications derived from the equivalent concept should be construed as being included in the scope of the present invention.

1st Refrigerant Circulation: C1
Second refrigerant circuit: C2
3rd refrigerant circuit: C3
1: vehicle
10: Vehicle air conditioning system
100: air conditioner 110: compressor
130: condenser 150: expansion valve
170: evaporator 200: supercharger
300: circulation control unit 310: refrigerant line
311: first branch pipe 313: second branch pipe
315: third branch pipe 330: pressure sensor
350: opening and closing means 351: first three-way valve
353: second three-way valve 370: controller

Claims (12)

An air conditioner having a compressor, a condenser, an expansion valve, and an evaporator to circulate the refrigerant to adjust the temperature in the vehicle;
a supercharger for first increasing the pressure of the refrigerant passing through the evaporator and delivering the refrigerant to the compressor; and
A circulation control unit for selectively adjusting the circulation of the refrigerant between the air conditioner and the supercharger by controlling the operation of the air conditioner and the supercharger in parallel or separately,
The circulation regulator
A refrigerant line connecting the evaporator, the compressor and the supercharger through a single conduit to enable circulation of the refrigerant;
a pressure sensor for sensing the pressure of the refrigerant circulating in the refrigerant line;
an opening/closing means including a first three-way valve and a second three-way valve for adjusting the flow rate of the refrigerant circulating in the refrigerant line; and
After receiving the refrigerant pressure value from the pressure sensor and comparing the corresponding refrigerant pressure value with the refrigerant pressure value of each preset section, the first three-way valve and the second three-way valve are electronically controlled to open and close according to whether or not the reference value is met. A vehicle air conditioning system with improved energy efficiency including a controller.
According to claim 1,
The circulation regulator
When the supercharger is operating and the air conditioner is not operating, a connection path between the air conditioner and the supercharger is opened to control the refrigerant of the air conditioner to flow into the supercharger.
According to claim 1,
The circulation regulator
An air conditioning system for a vehicle with improved energy efficiency, wherein the air conditioner is controlled so that the refrigerant is circulated only to the air conditioner when the air conditioner is operating and the supercharger is not operating.
According to claim 1,
The circulation regulator
An air conditioning system for a vehicle with improved energy efficiency, wherein the compressor is driven at a relatively low number of revolutions per minute when the air conditioner and the supercharger are operated in parallel compared to when only the air conditioner is operated.
According to claim 1,
The first three-way valve is located between the evaporator and the supercharger,
The second three-way valve is located between the compressor and the supercharger,
The first three-way valve and the second three-way valve are connected at a distance from each other, an air conditioning system for a vehicle with improved energy efficiency.
According to claim 1,
The opening and closing means
An air conditioning system for a vehicle with improved energy efficiency, wherein the supercharger is provided for each section connected to the evaporator and the compressor.
According to claim 1,
The refrigerant line is
A first branch pipe connecting the outlet of the evaporator and the inlet of the supercharger;
a second branch pipe connecting the outlet of the evaporator and the inlet of the compressor; and
A third branch pipe connecting the outlet of the supercharger and the second branch pipe,
The first three-way valve
Cross-connecting the outlet of the evaporator, the first branch pipe and the second branch pipe,
The second three-way valve
An air conditioning system for a vehicle with improved energy efficiency, which cross-connects the second branch pipe, the third branch pipe, and the inlet of the compressor.
According to claim 7,
The second three-way valve,
The vehicle air conditioning system with improved energy efficiency, wherein the circulation of the refrigerant is controlled so that the refrigerant of the second branch pipe and the refrigerant of the third branch pipe are introduced into the compressor in a mutually mixed state. delete delete delete delete

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