KR101172542B1 - Air Cycle for Car Air Conditioning System - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cycle for a vehicle air conditioner, which uses a reverse-Bryton cycle as an alternative cycle to a refrigeration cycle in a vehicle air conditioner, wherein the reverse-Brighton cycle and the vehicle By heat exchange with the air blown into the room through the closed circuit of the secondary fluid, it provides an air cycle for the vehicle air conditioning system that can perform all functions of cooling, heating, dehumidification with environmentally friendly, safe and high efficiency For the purpose of

In order to achieve the above object, the present invention provides an air cycle including a compressor (11), a high temperature heat exchanger (12), an expander (13), and a low temperature heat exchanger (14); A vehicle interior heat exchanger (21, 31) for exchanging heat with air introduced into the vehicle interior; One end is connected to the vehicle interior side heat exchanger (21, 31), the other end is connected to the air cycle side heat exchanger (12, 14), the air flowing into the vehicle interior and the air cycle side heat exchanger (12, And a closed circuit 40 of the secondary fluid that performs heat transfer therebetween.

Vehicle air conditioning units, reverse Brayton cycles, air cycles, refrigerants

Description

Air Cycle for Vehicle Air Conditioning System

1 is a conceptual diagram of a conventional refrigeration cycle,

2 is a schematic configuration diagram of an air cycle,

3 is a TS diagram of an air cycle,

4 is a schematic configuration diagram of an air cycle in which a regenerator is introduced,

5 is a TS diagram of an air cycle in which a regenerator is introduced;

6 is a conceptual diagram showing a cooling mode in an air cycle according to the present invention;

7 is a conceptual diagram showing a heating mode in an air cycle according to the present invention;

8 is a conceptual diagram illustrating a dehumidification mode in an air cycle according to the present invention.

* Description of the symbols for the main parts of the drawings *

10 ... Air Cycle 11 ... Compressor

12 High temperature heat exchanger

14 ... low temperature heat exchanger 17 ... regenerator

20 ... 1 closed loop 21 ... cooling core

22, 32 ... valve 23, 33 ... pump

24, 34 ... check valve 30 ... 2nd closed circuit

31.Heat core 50 ... Outdoor heat exchanger

60 ... Noise Attenuator 70 ... Blower

The present invention relates to an air cycle for a vehicle air conditioner, and more particularly, a reverse-Bryton cycle is used as an alternative cycle for a refrigeration cycle in a vehicle air conditioner. For vehicle air conditioning system that can perform cooling, heating, and dehumidification functions with environment-friendly, safe and high efficiency by exchanging heat between the Brayton cycle and the air blown into the vehicle through the closed circuit of the secondary fluid. It is about an air cycle.

In order to create a comfortable riding environment, the vehicle is provided with an air conditioning apparatus that controls the temperature and humidity of the vehicle indoor air.

In general, a refrigeration cycle is applied to such a vehicle air conditioner in which a refrigerant is phase-changed into a gas phase and a liquid phase, and at this time, cooling of air blown into the vehicle interior is performed by absorption and release of latent heat.

1, a conceptual diagram of a conventional refrigeration cycle is shown.

In a conventional refrigeration cycle, R-134a is used as a refrigerant, and as shown in FIG. 1, the refrigerant is compressed at a high temperature and a high pressure in the compressor 1, and then condensed in a liquid state in the condenser 2. The condensed refrigerant is expanded through the expansion valve (3) so as to be easily vaporized, and then the expanded refrigerant is evaporated in the evaporator (4) to pass through the refrigerant passing through the evaporator (4) and the evaporator (4). Air conditioning the vehicle interior by heat exchange with air supplied to the vehicle interior.

R-134a, which is a refrigerant used in the conventional refrigeration cycle as described above, is known to be the main culprit of environmental degradation such as global warming, and therefore, its use is expected to be suppressed and gradually banned.

Therefore, interest in the development of alternative refrigerants to replace the R-134a is increasing, and accordingly CO ₂ and R-152a have been discussed as the next-generation alternative refrigerants.

However, since CO ₂ requires a high operating pressure, all parts applied to the refrigeration cycle must be newly developed for high pressure, and thus the cost of the parts can be changed by changing the thickness of the material and changing the specifications to improve the pressure resistance. There is a problem that this rises.

On the other hand, the R-152a has the advantage that the parts used in the existing refrigeration cycle using the R-134a can be used as it is, but R-152a itself is ASHRAE (American Society of Heating, Refrigerating and Air-conditioning Engineers) Since it belongs to the A2 group (refrigerant group having a slightly flammable) among the prescribed refrigerant groups, there is a problem that it is somewhat unstable to be used as a vehicle refrigerant.

On the other hand, in recent years, in response to the demand of environmentally friendly vehicles, pollution-free electric vehicles using fuel cells and the like without using oil have been developed.

Since the electric vehicle also uses a conventional refrigeration cycle in which R-134a is compressed and circulated by the compressor 1, there is a problem in that a lot of power is consumed to drive the compressor.

Therefore, by using a new cycle that replaces the conventional refrigeration cycle, rather than replacing the refrigerant itself as described above, while trying to develop a new system that is environmentally friendly, safe and high efficiency, and also applicable to a new concept vehicle of a new engine driving method Effort continued.

One of the most promising alternatives to this cycle is the air cycle, called the reverse-Brighton cycle.

An air cycle is a system that uses a gaseous fluid, in particular air, as a refrigerant, and is a cycle in which a refrigeration effect is obtained by operating a Brayton cycle, which is a kind of gas power cycle, in reverse.

The biggest advantage of the air cycle is that there is no problem of environmental destruction such as ozone layer destruction and global warming, which were problems of the existing refrigerants because air is used as the refrigerant.

2 shows a schematic configuration diagram of the air cycle, and FIG. 3 shows a TS diagram of the air cycle.

2 and 3, the basic principle of the air cycle is as follows.

The overall circulation of the air cycle includes: (i) a compression process (a → b) in which the air is compressed in the compressor (11) to increase its pressure and temperature, and ii) the compressed high pressure and high temperature air is a high temperature heat exchanger (12). ) Is transferred to the external heat source 15 and the temperature decrease process (b → c) in which the temperature decreases under isostatic conditions, and iii) the air having a lowered temperature is expanded in the expander 13 so that the pressure and temperature are increased. Descending expansion process (c → d), and Ⅳ) Temperature rising process in which the temperature and pressure lowered air receives heat from the external heat source 16 in the low temperature heat exchanger 14 and the temperature rises under isostatic conditions. d → a).

At this time, a compression work for driving the compressor is required in the compression process (a → b), and an expansion work is generated from the expander in the expansion process (c → d), thereby reducing the required power of the compressor by returning it to the compressor. Can be.

In addition, in the temperature lowering process (b → c) or the temperature raising process (d → a), the external heat sources 15 and 16 correspond to the air conditioning space. Therefore, in this process, the air is released by absorbing heat or absorbing heat. It serves to heat or cool the space.

Cooling capacity (Q) and Coefficient of Performance (COP) of the entire air cycle can be expressed as follows.

<Formula 1>

On the other hand, in order to increase the cooling performance and COP of the system, as shown in Figs. 4 and 5, the hot air at the outlet side of the high temperature heat exchanger 12 and the low temperature at the outlet side of the low temperature heat exchanger 14 are shown. It is common to use a regenerator 17 which serves to heat exchange the air with each other.

In this case, by the regeneration processes e → c and f → a in the regenerator 17, as the temperature of the air at the inlet side of the expander 13 is further reduced, the temperature of the air after expansion is further lowered. As a result, the overall performance of the system is increased.

As another method of improving the performance in the application of the air cycle, an open system for removing the low temperature heat exchanger 14 among the components of the cycle and supplying the air discharged from the expander 13 directly to the air conditioning space can be considered.

However, in this case, since the air discharged from the expander is saturated with frost and very cold below zero, there are many problems in supplying it immediately to the vehicle interior.

Therefore, in applying the air cycle to the air conditioner of the vehicle, it must be applied as a closed cycle, and as shown in FIGS. 2 and 3, the high temperature heat exchanger 12 or the low temperature heat exchanger 14 exchanges heat with the air conditioning space. Thus, the vehicle interior is heated or cooled.

However, the air flowing into the high temperature heat exchanger 12 from the compressor 11 is very high temperature, and the air flowing into the low temperature heat exchanger 14 from the expander 13 is sub-zero very cold air. If (12, 14) heat exchanges directly with the air conditioning space, it becomes difficult to control the temperature and humidity of the vehicle interior.

Therefore, from the viewpoint of temperature and humidity control in the vehicle interior, there is a need to introduce a buffer heat transfer system between the heat exchangers 12 and 14 and the air conditioning space.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an air cycle device for a vehicle air conditioner that has no adverse effects of environmental damage such as ozone layer destruction and global warming, which were problems of existing refrigerants. .

Another object of the present invention is to provide an air cycle for a vehicle air conditioner as a new air conditioning system that can be applied to both a conventional engine driving method and an engine driving method using electricity.

In addition, it is another object to provide an air cycle for a vehicle air conditioner which improves the efficiency of the system and reduces the noise of the high-speed rotating body.

In order to achieve the above object, the present invention includes an air cycle comprising a compressor, a high temperature heat exchanger, an expander, a low temperature heat exchanger, the primary fluid in the gas state as a heat transfer fluid; A vehicle interior heat exchanger configured to exchange heat with air introduced into the vehicle interior; One end is connected to the vehicle interior heat exchanger, the other end is connected to the air cycle side heat exchanger, and the secondary fluid performs heat transfer between the air introduced into the vehicle interior by the secondary fluid and the air cycle side heat exchanger. Characterized in that it comprises a closed circuit.

In addition, on the circulation path of the secondary fluid between the vehicle indoor heat exchanger and the air cycle heat exchanger, a separate outdoor heat exchanger is provided such that the secondary fluid branches off during circulation to exchange heat with air outside the vehicle. desirable.

The secondary fluid flows to the outdoor heat exchanger at a branch point where the secondary fluid branches to the outdoor heat exchanger on a circulation path of the secondary fluid from the air cycle side heat exchanger to the vehicle interior side heat exchanger core. And a valve for selectively opening and closing the flow path to the vehicle interior side heat exchanger.

In addition, when the high temperature heat exchanger and the low temperature heat exchanger are both provided with the closed circuit of the secondary fluid, the closed circuit of the secondary fluid, one end is connected to the cooling core of the vehicle heat exchanger, the other end is the air A first closed circuit connected to the low temperature heat exchanger of the cycle side heat exchanger; One end is connected to the heater core of the vehicle interior heat exchanger, the other end is composed of a second closed circuit connected to the high temperature heat exchanger of the air cycle side heat exchanger, by adjusting the direction in which the secondary fluid flows by the ball, It is preferable to perform cooling, heating, and dehumidification mode of the vehicle interior by controlling whether the secondary fluid flows into the cooling core and / or the heater core.

In addition, when the cooling mode is performed, the secondary fluid circulating the first closed circuit circulates only between the cooling core and the low temperature heat exchanger, and the secondary fluid circulating the second closed circuit is the high temperature. It is preferable to circulate only between the heat exchanger and the outdoor heat exchanger.

In the heating mode, the secondary fluid circulating in the first closed circuit circulates only between the low temperature heat exchanger and the outdoor heat exchanger, and the secondary fluid circulating in the second closed circuit is the heater. It is preferable to circulate only between the core and the high temperature heat exchanger.

In the case of performing the dehumidification mode, the secondary fluid circulating in the first closed circuit circulates between the cooling core and the low temperature heat exchanger, and the secondary fluid circulating in the second closed circuit is the heater. It is preferable to circulate between the core and the high temperature heat exchanger.

On the other hand, it is preferable that the closed circuit of the secondary fluid is provided with a pump for forcing the circulation of the secondary fluid.

Further, between the high temperature heat exchanger and the expander and between the low temperature heat exchanger and the compressor, 1 flows between the primary fluid flowing between the high temperature heat exchanger and the expander and the low temperature heat exchanger and the compressor. Preferably, a regenerator is provided for heat transfer between the tea fluid.

In addition, it is preferable that the compressor or the expander includes a noise attenuator on an inlet through which the primary fluid flows in or an outlet through which the primary fluid flows out.

In addition, it is preferable that a part of the required power of the compressor is supplied from the power generated in the expander.

Hereinafter, an embodiment of an air cycle for a vehicle air conditioner according to the present invention will be described in detail with reference to the drawings.

6, 7 and 8 are conceptual views showing cooling, heating and dehumidification modes in the air cycle according to the present invention, respectively.

As shown, the vehicle air conditioner air cycle according to the present invention, the air cycle 10, the primary fluid as a heat transfer fluid, the air introduced into the vehicle interior by the secondary fluid and the air cycle 10 And a closed circuit 40 of the secondary fluid that performs heat transfer therebetween.

The air cycle 10 is a reverse-Brighton cycle that reversely operates a Brayton cycle, which is a kind of gas power cycle as described above.

As the primary fluid of the air cycle 10, a gaseous fluid is used, and preferably air is used.

Since the basic principle of the air cycle 10 has already been described, a description thereof will be omitted. However, the difference from the normal air cycle is that the high temperature heat exchanger 12 and the low temperature heat exchanger 14 do not heat exchange with an external heat source, but heat exchange with the closed circuit 40 of the secondary fluid described later.

Meanwhile, the closed circuit 40 of the secondary fluid may be installed on at least one of the high temperature heat exchanger 12 side or the low temperature heat exchanger 14 side of the air cycle 10.

However, it is preferable to install both the high temperature heat exchanger 12 side and the low temperature heat exchanger 14 side of the air cycle 10 in implementing both the cooling, heating, and dehumidifying modes.

The secondary fluid of the closed circuit 40 is preferably a fluid in the liquid state, more preferably, water is used that does not adversely affect the environment and the human body.

The reason for using the fluid in the liquid state as the secondary fluid of the closed circuit 40 is as follows.

Since the primary fluid of the air cycle 10 is a gaseous fluid, the state of the high temperature is very high in the high temperature heat exchanger 12 and very low temperature in the low temperature heat exchanger 14.

Therefore, directly exchanging the air introduced into the vehicle interior with the high temperature heat exchanger 12 or the low temperature heat exchanger 14 has a problem in terms of temperature and humidity control of the vehicle interior.

Therefore, the heat exchange between the high temperature heat exchanger 12 or the low temperature heat exchanger 14 and the air introduced into the vehicle interior is carried out in the middle, and at the time of heat exchange with the air introduced into the vehicle interior, There is a need to select heat transfer fluids that do not become or become too cold.

Satisfying these conditions is a liquid fluid having a higher specific heat than a gaseous fluid, and more preferably water may be used.

Hereinafter, the case where air is used as the primary fluid of the air cycle 10 and water is used as the secondary fluid of the closed circuit 40 of the secondary fluid will be described as an example.

As shown in Figures 6 to 8, the closed circuit 40 of the secondary fluid, one end is connected to the vehicle interior heat exchangers (21, 31) that exchange heat with the air flowing into the vehicle interior, the other end is the air It is connected to the cycle side heat exchanger (12, 14).

The indoor heat exchanger 21 and 31 of the vehicle may include a cooling core 21 and a heater core 31. The air cycle side heat exchanger 12 and 14 may include a high temperature heat exchanger 12 and a low temperature heat exchanger. 14).

The cooling core 21 and the heater core 31 are heat exchangers corresponding to the evaporator and the heater core of the general vehicle air conditioner, and the air blown into the vehicle interior by the blower 70 by the cooling core 21. Cooling or heating by the heater core 31.

The closed circuit 40 of the secondary fluid has a first closed circuit 20 having one end connected to the cooling core 21 of the vehicle heat exchanger and the other end connected to the low temperature heat exchanger 14 of the air cycle heat exchanger. ) And a second closed circuit 30 having one end connected to the heater core 31 of the vehicle heat exchanger and the other end connected to the high temperature heat exchanger 12 of the air cycle side heat exchanger.

As described later, the first closed circuit 20 has one end connected with the cooling core 21 and the other end connected with the low temperature heat exchanger 14.

Accordingly, in the first closed circuit 20, water circulating therein absorbs heat from the air blown from the cooling core 21 into the vehicle interior, and the low temperature heat exchanger 14 of the air cycle 10 By transferring heat to the air circulating inside, it is possible to perform the cooling of the vehicle interior.

In the closed circuit 40 of the secondary fluid, a separate outdoor heat exchanger 50 is provided between the vehicle interior side heat exchanger 21 and 31 and the air cycle side heat exchanger 12 and 14. Is installed.

Accordingly, in the first closed circuit 20, a branch point at which water branches to the outdoor heat exchanger 50 is provided on a path through which water flows from the low temperature heat exchanger 14 to the cooling core 21. On the path through which water flows from the cooling core 21 to the low temperature heat exchanger 14, a confluence point at which water from the outdoor heat exchanger 50 joins is provided.

At the branch point from the low temperature heat exchanger 14 to the outdoor heat exchanger 50 provided on the path through which the water flows from the low temperature heat exchanger 14, a three-way valve is provided as a valve 22 for controlling the direction in which water flows. It is preferable.

The valve 22 alternately opens and closes a flow path flowing from the branch point to the cooling core 21 and a flow path branched therefrom and flowing to the outdoor heat exchanger 50, thereby determining a circulation flow path of water.

On the other hand, between the cooling core 21 and the confluence point around the confluence point from the outdoor heat exchanger 50 provided on the path through which water flows from the cooling core 21 to the low temperature heat exchanger 14. And a check valve 24 for preventing backflow of water flowing from the cooling core 21 to the confluence point, the outdoor heat exchanger 50 also between the outdoor heat exchanger 50 and the confluence point. It is preferable that a check valve 24 is provided to prevent the water flowing from the flow to the confluence point from the back.

By the check valve 24, all of the water joined at the confluence point can flow to the low temperature heat exchanger 14, and the water flows back from the confluence point to the cooling core 21 side or the outdoor heat exchanger 50 side. Can be prevented.

In addition, the outdoor heat exchanger 50 is installed to be exposed to the outside air so as to exchange heat with the air outside the vehicle, and the water flowing from the branch point absorbs heat of the outside air by heat exchange with the outside air, and then the confluence point. Return to

On the other hand, the second closed circuit 30, one end is connected to the heater core 31, the other end is connected to the high temperature heat exchanger (12).

Therefore, in the second closed circuit 30, water circulating in the inside absorbs heat from air circulating in the air cycle 10 in the high temperature heat exchanger 12, and the vehicle is heated in the heater core 31. By transferring heat to the air blown into the room, the vehicle interior is heated.

On the other hand, a separate outdoor heat exchanger 50 is also provided between the heater core 31 and the high temperature heat exchanger 12 here.

Therefore, a branching point at which water branches to the outdoor heat exchanger 50 is provided on a path through which water flows from the high temperature heat exchanger 12 to the heater core 31, and the high temperature from the heater core 31 is provided. On the path through which water flows into the heat exchanger 12, a confluence point where water from the outdoor heat exchanger 50 joins is provided.

At the branch point from the high temperature heat exchanger 12 to the outdoor heat exchanger 50 provided on the path through which the water flows from the heater core 31, a three-way valve is provided as a valve 32 that controls the direction in which the water flows. It is preferable.

The valve 32 alternately opens and closes a flow path flowing from the branch point to the heater core 31 and a flow path branched therefrom and flowing to the outdoor heat exchanger 50, thereby determining a circulation flow path of water.

On the other hand, between the heater core 31 and the confluence point centering on the confluence point from the outdoor heat exchanger 50 provided on the path through which water flows from the heater core 31 to the high temperature heat exchanger 12. And a check valve 34 for preventing backflow of water flowing from the heater core 31 to the confluence point, the outdoor heat exchanger 50 also between the outdoor heat exchanger 50 and the confluence point. It is preferable that a check valve 34 is installed to prevent the water flowing from the flow to the confluence point from the back.

By the check valve 34, all the water joined at the confluence point can flow to the high temperature heat exchanger 12, the water flows back to the heater core 31 side or the outdoor heat exchanger 50 side from the confluence point Can be prevented.

On the other hand, the outdoor heat exchanger 50 is installed to be exposed to the outside air so as to exchange heat with the air outside the vehicle, the water flowing from the branch point is discharged or sucked to the outside air by heat exchange with the outside here Return to the confluence point.

It is preferred that pumps 23 and 33 are provided on the closed circuit 40 of the secondary fluid to force the circulation of water.

In addition, in the air cycle 10, it is preferable that a muffler is provided as the noise attenuator 60 for reducing the noise of the compressor 11 and the expander 13 which are the high speed rotating bodies.

In addition, between the high temperature heat exchanger 12 and the expander 13 and between the low temperature heat exchanger 14 and the compressor 11, the air flowing between the high temperature heat exchanger 12 and the expander 13 and Preferably, a regenerator 17 for heat transfer between the low temperature heat exchanger 14 and the air flowing between the compressor 11 is provided.

The noise attenuator 60 may be installed at the inlet or the outlet of the compressor 11 and the expander 13, respectively.

Next, in the air cycle according to the present invention configured as described above, the operation relationship in the cooling mode, heating mode and dehumidification mode will be described with reference to the drawings.

First, the cooling mode in the air cycle according to the present invention will be described with reference to FIG. 6.

FIG. 6 shows the flow of air circulating in the air cycle 10 and the flow of water circulating in the closed circuit 40 of the secondary fluid when only the air conditioner is operated.

In the cooling mode, since the heat exchange between the heater core 31 and the air blown into the vehicle interior is not necessary, as shown, water does not flow to the heater core 31 side.

Therefore, in the second closed circuit 30, water absorbing heat from the high temperature heat exchanger 12 is introduced into the outdoor heat exchanger 50 by bypassing the heater core 31 by the three-way valve 32. After the heat radiation to the outside air in the outdoor heat exchanger (50) and the temperature is lowered, it is returned to the high temperature heat exchanger (12) again.

On the other hand, in the air cycle 10, the high-pressure air passing through the high temperature heat exchanger 12, the temperature is reduced to room temperature, the temperature is further reduced through the regenerator 17, and the subzero temperature while passing through the expander 13 Until the temperature decreases.

The air whose temperature has been reduced to the sub-zero temperature drops the temperature of the water circulating in the first closed circuit 20 while passing through the low temperature heat exchanger 14, and at the same time, the temperature of the air itself increases.

The air exiting the low temperature heat exchanger 14 is further passed through the regenerator 17 and the temperature is further raised and finally returned to the compressor 11.

On the other hand, in the first closed circuit 20, water that has released heat to the low temperature heat exchanger 14 is introduced into the cooling core 21 by bypassing the outdoor heat exchanger 50 by the three-way valve 22. After absorbing heat from the air blown from the cooling core 21 into the vehicle interior and performing cooling performance, the cooling core 21 returns to the low temperature heat exchanger 14 again.

Next, the heating mode in the air cycle according to the present invention will be described with reference to FIG. 7.

FIG. 7 shows the flow of air circulating in the air cycle 10 and the flow of water circulating in the closed circuit 10 of the secondary fluid when only the heater is operated.

In the heating mode, since the heat exchange between the cooling core 21 and the air blown into the vehicle interior is not necessary, as shown, water does not flow to the cooling core 21 side.

Therefore, in the first closed circuit 20, water that has released heat to the low temperature heat exchanger 14 is introduced into the outdoor heat exchanger 50 by bypassing the cooling core 21 by the three-way valve 22. After the temperature is raised by absorbing heat from the outside air in the outdoor heat exchanger (50), it is returned to the low temperature heat exchanger (14) again.

On the other hand, in the air cycle 10, the high-temperature, high-pressure air in which the temperature and pressure rise in the compressor 11 supplies heat to the water circulating through the second closed circuit 30 while passing through the high temperature heat exchanger 12, The flow rate enters the regenerator 17 while the temperature is reduced.

The air that has passed through the regenerator 17 passes through the inflator 13 and the temperature decreases to below zero, and the air whose temperature decreases to below the below zero temperature passes through the low temperature heat exchanger 14, and thus, the first closed circuit 20. As the temperature of the water circulating decreases, the temperature of the air itself increases.

The air exiting the low temperature heat exchanger 14 is further increased through the regenerator 17 and finally returned to the compressor 11.

On the other hand, in the second closed circuit 30, water absorbing heat from the high temperature heat exchanger 12 is introduced into the heater core 31 by bypassing the outdoor heat exchanger 50 by the three-way valve 32. After discharging heat to the air blown from the heater core 31 to the vehicle interior and exerting heating performance, the heater core 31 returns to the high temperature heat exchanger 12 again.

Next, the dehumidification mode in the air cycle according to the present invention will be described with reference to FIG. 8.

FIG. 8 shows the flow of air circulating in the air cycle 10 and the flow of water circulating in the closed circuit 40 of the secondary fluid when only dehumidification is performed without temperature change.

In this case, as described above, the water flowing through the first and second closed circuits 20 and 30 bypasses the outdoor heat exchanger 50, respectively, and the heater core 31 and the cooling core 21, respectively. Perform a dehumidification function while going through.

On the other hand, the air cycle 10 side has a structure in which the regenerator 17 is mounted to improve the system efficiency, and the work obtained from the expander 13 is returned to the compressor 11 to reduce the power consumption, thereby improving the COP of the system. It was set as the structure to make.

In addition, in order to reduce the noise of the system, a noise attenuator 60 was mounted in front of or behind the compressor 11 or the expander 13, respectively.

As described above, according to the air cycle for the vehicle air conditioner according to the present invention, by using a new cycle to replace the conventional refrigeration cycle, it is possible to provide an environment-friendly, safe and efficient air cycle for the vehicle air conditioner It works.

In addition, it is possible to provide an air cycle for a vehicle air conditioner that is applicable to a conventional engine driving method and also applicable to a new concept vehicle of a new engine driving method such as an electric vehicle.

In addition, by providing a closed circuit of the secondary fluid that mediates heat transfer between the air cycle and the air conditioning space, the air conditioner for the vehicle air conditioner that can perform all functions of cooling, heating, and dehumidification with environment-friendly, safe and high efficiency. There is an effect that can provide a cycle.

In addition, since the system is composed of a double closed circuit, it is possible to optimize the control of temperature and humidity in the vehicle interior, and at the same time, to prevent the air used in the drive unit of the system from being directly discharged into the vehicle interior. There is an effect that can provide a cycle.

Claims (11)

An air cycle (10) comprising a compressor (11), a high temperature heat exchanger (12), an expander (13), and a low temperature heat exchanger (14), wherein the primary fluid in a gas state is a heat transfer fluid; A vehicle interior heat exchanger (21, 31) for exchanging heat with air introduced into the vehicle interior; One end is connected to the vehicle interior side heat exchanger (21, 31), the other end is connected to the air cycle side heat exchanger (12, 14), the air flowing into the vehicle interior by the secondary fluid and the air cycle side An air cycle for a vehicle air conditioner, characterized in that it comprises a closed circuit (40) of the secondary fluid for performing heat transfer between the heat exchanger (12, 14). The method of claim 1, On the circulation path of the secondary fluid between the vehicle interior side heat exchanger 21 and 31 and the air cycle side heat exchanger 12 and 14, the secondary fluid is branched during circulation to exchange heat with air outside the vehicle. Air cycle for a vehicle air conditioner, characterized in that a separate outdoor heat exchanger (50) is provided. 3. The method of claim 2, At a branch point where the secondary fluid branches to the outdoor heat exchanger 50 on a circulation path of the secondary fluid from the air cycle side heat exchanger 12 and 14 to the vehicle interior side heat exchanger core 21 and 31, Valves 22 and 32 are provided to selectively open and close the flow path of the secondary fluid to the outdoor heat exchanger 50 and the flow path to the indoor heat exchanger 21 and 31 of the vehicle. cycle. The method of claim 3, When the high temperature heat exchanger 12 and the low temperature heat exchanger 14 are both provided with a closed circuit 40 of the secondary fluid, The closed circuit 40 of the secondary fluid may include a first closed circuit having one end connected to the cooling core 21 of the vehicle heat exchanger and the other end connected to the low temperature heat exchanger 14 of the air cycle heat exchanger. 20); One end is connected to the heater core 31 of the vehicle interior heat exchanger, the other end is composed of a second closed circuit 30 connected to the high temperature heat exchanger 12 of the air cycle side heat exchanger, By controlling the direction in which the secondary fluid flows by the valves 22 and 32, by controlling whether the secondary fluid flows into the cooling core 21 and / or the heater core 31, cooling the vehicle interior, Air cycle for vehicle air conditioning apparatus, characterized in that to perform the heating, dehumidification mode. 5. The method of claim 4, When the cooling mode is performed, the secondary fluid circulating in the first closed circuit 20 circulates only between the cooling core 21 and the low temperature heat exchanger 14, and the second closed circuit 30 is circulated. The secondary fluid circulating through the air cycle for the vehicle air conditioner, characterized in that circulating only between the high temperature heat exchanger (12) and the outdoor heat exchanger (50). 5. The method of claim 4, In the heating mode, the secondary fluid circulating in the first closed circuit 20 circulates only between the low temperature heat exchanger 14 and the outdoor heat exchanger 50, and the second closed circuit 30 is circulated. The secondary fluid circulating (circle) is circulated only between the heater core (31) and the high temperature heat exchanger (12). 5. The method of claim 4, When the dehumidification mode is performed, the secondary fluid circulating in the first closed circuit 20 circulates between the cooling core 21 and the low temperature heat exchanger 14 and the second closed circuit 30. The secondary fluid circulating through the air cycle for the vehicle air conditioner, characterized in that circulating between the heater core (31) and the high temperature heat exchanger (12). The method according to claim 2 or 3, The closed circuit (40) of the secondary fluid, the air conditioner for a vehicle air conditioner, characterized in that the pump (23, 33) for forcing the circulation of the secondary fluid. The method according to any one of claims 1 to 7, Flowing between the high temperature heat exchanger 12 and the expander 13 between the high temperature heat exchanger 12 and the expander 13 and between the low temperature heat exchanger 14 and the compressor 11. And a regenerator (17) for heat transfer between the primary fluid and the primary fluid flowing between the low temperature heat exchanger (14) and the compressor (11). 4. The method according to any one of claims 1 to 3, The compressor (11) or the inflator (13), the air cycle for the vehicle air conditioner characterized in that it comprises a noise attenuator (60) on the inlet for the primary fluid flows in or the outlet for the primary fluid flows out. 4. The method according to any one of claims 1 to 3, A part of the required power of the compressor (11) is supplied from the power generated by the inflator (13) air cycle for the vehicle air conditioner.

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