Whole vehicle thermal management system of pure electric commercial vehicle

Abstract

The invention discloses a whole vehicle thermal management system for a pure electric commercial vehicle. The whole vehicle thermal management system is provided with a passenger compartment refrigeration cycle subsystem, a passenger compartment warm air cycle subsystem, a battery thermal management subsystem and a motor assembly thermal management subsystem, the passenger compartment refrigeration cycle subsystem comprises a compressor, a water-cooling condenser, an evaporator, a heat regenerator, a first cooler and a second cooler which are connected through a passenger compartment refrigerant circulation pipeline, and refrigerant transmission pipelines and water medium transmission pipelines which are independent of one another are arranged in the water-cooling condenser, the first cooler and the second cooler. Refrigerant transmission pipelines of the water cooling condenser, the first cooler and the second cooler are connected in a passenger compartment refrigerant circulation pipeline, a water medium transmission pipeline of the water cooling condenser and a water medium transmission pipeline of the first cooler are connected with a motor assembly heat management subsystem, and a water medium transmission pipeline of the second cooler is connected with a battery heat management subsystem. And the heat regenerator is arranged among the water-cooling condenser, the evaporator and the first cooler. The purpose of improving the economical efficiency, the dynamic property and the comfort of the vehicle is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a thermal management system for a pure electric commercial vehicle with a heat regenerator. Background Art

[0002] Under the background of my country's "dual carbon" strategy, new energy electric vehicle technology is developing rapidly. At the same time, the market's requirements for vehicle range, safety, comfort and other aspects are increasing. The importance of automotive thermal management systems is fully highlighted. An efficient thermal management system not only helps to extend the battery life and improve driving comfort, but also improves its safety performance by preventing thermal runaway.

[0003] The thermal management system of electric vehicles is to maintain the motor, electronic control equipment and battery at a suitable temperature, while ensuring the comfort of the passenger compartment. In the existing technology, the air conditioner, battery, motor and other related components and subsystems of the thermal management system of pure electric commercial vehicles operate independently, and there are certain defects in matching, optimization and control between them, making it difficult to effectively realize the full utilization of waste heat, thus affecting the economy, power and comfort of vehicle operation. Summary of the invention

[0004] The present invention provides a thermal management system for a pure electric commercial vehicle, which aims to fully utilize waste heat through the cooperation of a passenger compartment refrigeration circulation subsystem, a passenger compartment heating circulation subsystem, a battery thermal management subsystem and a motor assembly thermal management subsystem, and match the thermal management requirements of the vehicle under different working conditions, so as to achieve the purpose of improving the vehicle's operating economy, power and comfort.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: A thermal management system for a pure electric commercial vehicle is provided with a passenger compartment refrigeration cycle subsystem, a passenger compartment heating cycle subsystem, a battery thermal management subsystem and a motor assembly thermal management subsystem; the passenger compartment refrigeration cycle subsystem comprises a compressor, a water-cooled condenser, an evaporator, a regenerator, a first cooler and a second cooler, and the above components are connected through a passenger compartment refrigerant circulation pipeline, and the water-cooled condenser, the first cooler and the second cooler are each provided with mutually independent refrigerant transmission pipelines and water medium transmission pipelines, and the refrigerant transmission pipelines of the three are connected in the passenger compartment refrigerant circulation pipeline, the water medium transmission pipelines of the water-cooled condenser and the first cooler are connected to the motor assembly thermal management subsystem, and the water medium transmission pipeline of the second cooler is connected to the battery thermal management subsystem, and the regenerator is installed between the water-cooled condenser and the evaporator and the first cooler; the passenger compartment heating cycle subsystem is connected in parallel with the motor assembly thermal management subsystem; the battery thermal management subsystem is connected in series with the motor assembly thermal management subsystem.

[0006] The above-mentioned pure electric commercial vehicle thermal management system, the motor assembly thermal management subsystem includes a low-temperature radiator, a first electronic water pump, a motor, a motor controller, an auxiliary drive four-in-one controller and a four-way reversing valve. The above-mentioned components are connected through the water medium circulation pipeline of the motor assembly thermal management subsystem, and are connected to the battery thermal management subsystem through the four-way reversing valve, and also realize heat exchange with the passenger compartment refrigeration circulation subsystem through the water medium transmission pipeline of the first cooler.

[0007] The above-mentioned pure electric commercial vehicle thermal management system, the motor assembly thermal management subsystem also includes a first three-way proportional valve, a second three-way proportional valve and a third three-way proportional valve, the first three-way proportional valve is arranged between the low-temperature radiator, the first electronic water pump, the water-cooled condenser and the water medium transmission pipeline of the first cooler; the second three-way proportional valve is arranged between the auxiliary drive four-in-one controller, the water medium transmission pipeline of the first cooler, and the four-way reversing valve; the third three-way proportional valve is arranged between the water medium transmission pipeline of the water-cooled condenser and the passenger compartment warm air circulation subsystem.

[0008] The above-mentioned pure electric commercial vehicle whole vehicle thermal management system, the battery thermal management subsystem includes a battery water heating PTC, a battery and a second electronic water pump. The above-mentioned components are connected through the battery thermal management subsystem water medium circulation pipeline, and are connected to the motor assembly thermal management subsystem through a four-way reversing valve, and heat exchange is achieved with the passenger compartment refrigeration circulation subsystem through the water medium transmission pipeline of the second cooler.

[0009] The above-mentioned pure electric commercial vehicle thermal management system, the passenger compartment warm air circulation subsystem includes a passenger compartment water heating PCT, a warm air core and a third electronic water pump, and the above-mentioned components are connected through the passenger compartment warm air circulation subsystem water medium circulation pipeline and then connected in parallel in the motor assembly thermal management subsystem water medium circulation pipeline.

[0010] The above-mentioned pure electric commercial vehicle thermal management system is provided with a first electronic expansion stop valve on the liquid inlet pipe of the refrigerant transmission pipe of the second cooler of the passenger compartment refrigeration cycle subsystem, a second electronic expansion stop valve on the liquid inlet pipe of the evaporator, and a third electronic expansion stop valve on the liquid inlet pipe of the refrigerant transmission pipe of the first cooler.

[0011] The above-mentioned thermal management system for the pure electric commercial vehicle is provided with an electronic fan on the low-temperature radiator of the thermal management subsystem of the motor assembly.

[0012] The above-mentioned pure electric commercial vehicle thermal management system is provided with a blower on the evaporator of the passenger compartment refrigeration circulation subsystem and the heater core of the passenger compartment heating circulation subsystem.

[0013] The present invention provides a thermal management system for a pure electric commercial vehicle. A regenerator, a first cooler and a second cooler are arranged in a passenger compartment refrigeration cycle subsystem, so that high-temperature and high-pressure gas and low-temperature and low-pressure gas in the passenger compartment refrigeration cycle can be made to flow in opposite directions and alternately in the regenerator pipeline to exchange heat. Thus, while the liquid at the condenser outlet is supercooled, the temperature and pressure of the low-temperature and low-pressure gas can be increased, thereby improving the refrigeration capacity per unit volume of the condenser and the thermal efficiency of the system. When both the battery and the passenger compartment have heating requirements in a low-temperature environment, the present invention can use the first cooler to recover the waste heat of the motor assembly, thereby making maximum use of the heat generated by the motor assembly. The present invention meets the working requirements of new energy pure electric commercial vehicles under environmental conditions of -20°C to 40°C through the coordination of the passenger compartment refrigeration circulation subsystem, the passenger compartment heating circulation subsystem, the battery thermal management subsystem and the motor assembly thermal management subsystem, and can realize more than ten functional modes to cope with different working conditions. Compared with the whole vehicle thermal management system of pure electric commercial vehicles in the prior art, the energy consumption ratio of the whole vehicle is reduced by 10%, and the driving range is increased by 5%. In addition, the components selected by the present invention are all platform-based mass-produced products in the industry, which are characterized by low price, mature technology and stable operation, thereby achieving the purpose of improving the vehicle's operating economy, power and comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the thermal management system for a pure electric commercial vehicle according to the present invention; Figure 2 It is a schematic diagram of the working principle of the present invention under the conditions of motor air cooling, passenger compartment refrigeration and battery cooling; Figure 3 It is a schematic diagram of the working principle of the present invention under the motor air cooling and battery cooling conditions; Figure 4 It is a schematic diagram of the working principle of the present invention in heating the passenger compartment by recovering the waste heat of the motor and the battery working condition; Figure 5 It is a schematic diagram of the working principle of the present invention in heating the passenger compartment through the motor source heat pump mode and the battery working condition; Figure 6 It is a schematic diagram of the working principle of the present invention in which the passenger compartment is heated by the PTC heating mode and the battery is in operation.

[0015] Explanation of the symbols in the figure: Ⅰ is the passenger compartment refrigeration cycle subsystem, Ⅱ is the passenger compartment heating cycle subsystem, Ⅲ is the battery thermal management subsystem, and Ⅳ is the motor assembly thermal management subsystem; 1 is an electronic fan, 2 is a low-temperature radiator, 3 is the first electronic water pump, 4 is the first three-way proportional valve, 5 is a motor, 6 is a motor controller, 7 is an auxiliary drive four-in-one controller, 8 is a first cooler, 9 is a water-cooled condenser, 10 is a battery water heating PTC, 11 is a four-way reversing valve, 12 is a battery, 13 is a second electronic water pump, 14 is a second three-way proportional valve, 15 is a compressor, 16 is a heat regenerator, 17 is a third three-way proportional valve, 18 is a passenger compartment water heating PTC, 19 is a first electronic expansion stop valve, 20 is a second cooler, 21 is a second electronic expansion stop valve, 22 is an evaporator, 23 is a heater core, 24 is a blower, 25 is a third electronic expansion stop valve, and 26 is a third electronic water pump. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Referring to FIG. 1 , the present invention provides a thermal management system for a pure electric commercial vehicle, which is provided with a passenger compartment refrigeration circulation subsystem I, a passenger compartment heating circulation subsystem II, a battery thermal management subsystem III and a motor assembly thermal management subsystem IV. A refrigerant circulation pipeline is provided in the passenger compartment refrigeration circulation subsystem I, and a refrigerant medium flows through the refrigerant circulation pipeline. A water medium circulation pipeline is provided in the passenger compartment heating circulation subsystem II, the battery thermal management subsystem III and the motor assembly thermal management subsystem IV, and circulating cooling water flows through the water medium circulation pipeline. The composition structures of the above subsystems and the connection relationships between them are as follows: The passenger compartment refrigeration cycle subsystem I includes a compressor 15, a water-cooled condenser 9, an evaporator 22, a regenerator 16, a first cooler 8 and a second cooler 20, and the above-mentioned components are connected through a passenger compartment refrigerant circulation pipeline. The water-cooled condenser 9, the first cooler 8 and the second cooler 20 are each provided with independent refrigerant transmission pipelines and water medium transmission pipelines, and the refrigerant transmission pipelines of the three are connected to the passenger compartment refrigerant circulation pipeline. The water medium transmission pipelines of the water-cooled condenser 9 and the first cooler 8 are connected to the motor assembly thermal management subsystem IV, and the water medium transmission pipeline of the second cooler 20 is connected to the battery thermal management subsystem III. The regenerator 16 is installed between the water-cooled condenser 9 and the evaporator 22 and the first cooler 8. A first electronic expansion stop valve 19 is provided on the liquid inlet pipeline of the refrigerant transmission pipeline of the second cooler 20, a second electronic expansion stop valve 21 is provided on the liquid inlet pipeline of the evaporator 22, and a third electronic expansion stop valve 25 is provided on the liquid inlet pipeline of the refrigerant transmission pipeline of the first cooler 8; The passenger compartment heating air circulation subsystem II includes the passenger compartment water heating PCT18, the heating core 23 and the third electronic water pump 26. The above components are connected through the passenger compartment heating air circulation subsystem water medium circulation pipeline and connected in parallel in the motor assembly thermal management subsystem water medium circulation pipeline; The battery thermal management subsystem III includes a battery water heating PTC 10, a battery 12 and a second electronic water pump 13. The above components are connected through the battery thermal management subsystem water medium circulation pipeline, and connected to the motor assembly thermal management subsystem IV through the four-way reversing valve 11, and heat exchange is achieved with the passenger compartment refrigeration circulation subsystem I through the water medium transmission pipeline of the second cooler 20; The motor assembly thermal management subsystem IV includes a low-temperature radiator 2, a first electronic water pump 3, a motor 5, a motor controller 6, an auxiliary drive four-in-one controller 7, a four-way reversing valve 11, a first three-way proportional valve 4, a second three-way proportional valve 14 and a third three-way proportional valve 17. The above components are connected through the water medium circulation pipeline of the motor assembly thermal management subsystem, and are connected in series with the battery thermal management subsystem III through the four-way reversing valve 11. Heat exchange is also achieved with the passenger compartment refrigeration circulation subsystem I through the water medium transmission pipeline of the first cooler 8. The first three-way proportional valve 4 is arranged between the low-temperature radiator 2, the first electronic water pump 3, the water-cooled condenser 9 and the water medium transmission pipeline of the first cooler 8; the second three-way proportional valve 14 is arranged between the auxiliary drive four-in-one controller 7, the water medium transmission pipeline of the first cooler 8, and the four-way reversing valve 11; the third three-way proportional valve 17 is arranged between the water medium transmission pipeline of the water-cooled condenser 9 and the passenger compartment warm air circulation subsystem II.

[0018] The present invention meets the working requirements of new energy pure electric commercial vehicles under environmental conditions of -20℃ to 40℃ through the cooperation of passenger compartment refrigeration circulation subsystem I, passenger compartment heating circulation subsystem II, battery thermal management subsystem III and motor assembly thermal management subsystem IV, and can realize more than ten functional modes to cope with different working conditions. Figures 2 to 6 Five specific embodiments of the present invention operating under different working conditions are shown, which are described as follows: See also Figure 2 , summer motor air cooling\passenger cabin cooling, battery cooling working mode When the ambient temperature is ≥30°C and the temperature of the battery 12 is ≥30°C, the full cooling mode is started, the motor assembly thermal management subsystem IV operates normally, the passenger compartment refrigeration cycle subsystem I and the battery thermal management subsystem III are started at the same time, the third electronic expansion stop valve 25 is closed, the first cooler 8 is in a non-working state, the compressor 15 is running, and the refrigerant in the circulation pipeline of the passenger compartment refrigeration cycle subsystem I passes through the second electronic expansion stop valve 21 and the evaporator 22, and the cold air is blown into the passenger compartment through the blower 24 to complete the cooling of the passenger compartment; the refrigerant in the circulation pipeline of the passenger compartment refrigeration cycle subsystem I also flows through the first Electronic expansion stop valve 19, second cooler 20, at the same time, start the second electronic water pump 13 in battery thermal management subsystem III, four-way reversing valve 11 is adjusted to V1-V3, V2-V4 channels, the cooling water of battery thermal management subsystem III is heat exchanged with the refrigerant in the second cooler 20 of passenger compartment refrigeration cycle subsystem I, low-temperature cooling water flows to battery 12, completing the battery cooling process, the refrigerant in passenger compartment refrigeration cycle subsystem I that flows through evaporator 22 and second cooler 20 merges on one side of regenerator 16, and then flows through regenerator 16 to compressor 15 to form a refrigeration cycle; When the temperature of motor 5 is ≥80℃ and the temperature of motor controller 6 is ≥60℃, the first electronic water pump 3 and the electronic fan 1 in the thermal management subsystem IV of the motor assembly are started, the first three-way proportional valve 4, the second three-way proportional valve 14, and the third three-way proportional valve 17 are all adjusted to the A1-A3 channel, and the four-way reversing valve 11 is adjusted to the V1-V3 and V2-V4 channels, and the cooling water flows through the low-temperature radiator 2. The high-temperature cooling water becomes low-temperature cooling water and then flows to the motor controller 6 and the motor 5, completing the cooling process of the motor controller 6 and the motor 5.

[0019] See also Figure 3 , summer motor air cooling\battery cooling working mode When the ambient temperature is 20℃~30℃ and the temperature of the battery 12 is ≥30℃, the semi-cooling mode is started, the motor assembly thermal management subsystem IV operates normally, and the second electronic expansion stop valve 21 and the third electronic expansion stop valve 25 are closed at the same time, the refrigerant flow circuit of the evaporator 22 and the first cooler 8 is cut off, the compressor 15 runs, and the refrigerant passes through the condenser 9, the regenerator 16, the second cooler 20, and flows through the regenerator 16 to the compressor 15, completing the battery cooling process.

[0020] See also Figure 4 , motor waste heat recovery to heat the passenger compartment and batteries When the ambient temperature is -15℃~10℃, the battery 12 temperature is -15℃~18℃, the motor 5 temperature is ≥80℃, and the motor controller 6 temperature is ≥60℃, the residual heat of the motor 5 can be used to heat the battery 12 and the passenger compartment. Under this condition, the compressor 15 does not need to be started. The first three-way proportional valve 4 and the third three-way proportional valve 17 are both adjusted to the A1-A2 channel. The first electronic water pump 3 in the motor assembly thermal management subsystem IV sends the high-temperature cooling water flowing through the motor 5 and the motor controller 6 to the warm air core 23 of the passenger compartment warm air circulation subsystem II, and then The warm air is delivered to the passenger compartment through the blower 24 to complete the heating process of the passenger compartment; at the same time, the second electronic water pump 13 of the battery thermal management subsystem III is started, and the four-way reversing valve 11 in the motor assembly thermal management subsystem IV is adjusted to the V4-V3 and V1-V2 channel connections, and the medium-temperature cooling water flowing through the heater core 23 flows to the battery 12 through the four-way reversing valve 11 to complete the battery heating process. At this time, the second three-way proportional valve 14 is adjusted to the A1-A3 connection, and the cooling water flows back to the motor 5 and the motor controller 6 to form a waste heat recovery circulation system.

[0021] See also Figure 5 , electric motor source heat pump heats the passenger compartment, battery When the ambient temperature is -15℃~10℃, the battery 12 temperature is 15℃~18℃, the motor 5 temperature is ≤80℃, and the motor controller 6 temperature is ≤60℃, the motor source heat pump mode needs to be started, the compressor 15 in the passenger compartment refrigeration cycle subsystem I runs, the refrigerant passes through the condenser 9, the regenerator 16, the first cooler 8, and finally flows through the regenerator 16 to the compressor 15, the first electronic water pump 3 is started, and the cooling water flowing through the motor 5 passes through the A1-A2 channel of the first three-way proportional valve 4. A part of the cooling water flows to the condenser 9 to absorb heat and become high-temperature cooling water. Water, start the third electronic water pump 26, the cooling water flows to the heater core 23 through the A1-A2 channel of the third three-way proportional valve 17, and completes the heating of the passenger compartment. At this time, the four-way reversing valve 11 in the thermal management subsystem IV of the motor assembly is adjusted to connect the V4-V3 and V1-V2 channels, and the second electronic water pump 13 is started to make the cooling water flow to the battery 12, and complete the battery heating; another part of the cooling water passes through the water medium transmission pipeline of the first cooler 8, passes through the full-through second three-way proportional valve 14, and flows back to the motor 5 together with the cooling water after heating the battery, forming a motor source heat pump cycle.

[0022] See also Figure 6 , PTC heating passenger compartment, battery When the ambient temperature is ≤-20℃, the battery 12 temperature is between -15℃ and 18℃, and the motor 5 has no waste heat, the battery water heating PTC 10 and the passenger compartment water heating PTC 18 are started to heat the passenger compartment and the battery. At this time, the first three-way proportional valve 4 and the third three-way proportional valve 17 are both adjusted to the A1-A2 channel, the second three-way proportional valve 14 is adjusted to the A1-A3 channel, and the four-way reversing valve 11 in the motor assembly thermal management subsystem IV is adjusted to the V4-V3 and V1-V2 channels.

[0023] The above are only five specific embodiments of the present invention. The vehicle driver can also control each execution component through the operating system, and utilize different coordination modes between the passenger compartment refrigeration circulation subsystem I, the passenger compartment warm air circulation subsystem II, the battery thermal management subsystem III and the motor assembly thermal management subsystem IV to adapt to different working conditions during vehicle driving.

Claims

1. A thermal management system for a pure electric commercial vehicle, characterized in that: A passenger compartment refrigeration circulation subsystem (I), a passenger compartment heating circulation subsystem (II), a battery thermal management subsystem (III) and a motor assembly thermal management subsystem (IV) are provided; the passenger compartment refrigeration circulation subsystem (I) comprises a compressor (15), a water-cooled condenser (9), an evaporator (22), a heat regenerator (16), a first cooler (8) and a second cooler (20); the above-mentioned components are connected through a passenger compartment refrigerant circulation pipeline; the water-cooled condenser (9), the first cooler (8) and the second cooler (20) are each provided with a mutually independent refrigerant transmission pipeline and a water medium transmission pipeline, and the three The refrigerant transmission pipeline is connected to the refrigerant circulation pipeline of the passenger compartment, the water medium transmission pipeline of the water-cooled condenser (9) and the first cooler (8) is connected to the motor assembly thermal management subsystem (IV), the water medium transmission pipeline of the second cooler (20) is connected to the battery thermal management subsystem (III), and the regenerator (16) is installed between the water-cooled condenser (9) and the evaporator (22) and the first cooler (8); the passenger compartment warm air circulation subsystem (II) is connected in parallel with the motor assembly thermal management subsystem (IV); and the battery thermal management subsystem (III) is connected in series with the motor assembly thermal management subsystem (IV).

2. The thermal management system for a pure electric commercial vehicle according to claim 1, characterized in that: The motor assembly thermal management subsystem (IV) comprises a low-temperature radiator (2), a first electronic water pump (3), a motor (5), a motor controller (6), an auxiliary drive four-in-one controller (7) and a four-way reversing valve (11). The above-mentioned components are connected through a water medium circulation pipeline of the motor assembly thermal management subsystem, and are connected to the battery thermal management subsystem (III) through the four-way reversing valve (11). Heat exchange is also achieved with the passenger compartment refrigeration circulation subsystem (I) through the water medium transmission pipeline of the first cooler (8).

3. The thermal management system for a pure electric commercial vehicle according to claim 2, characterized in that: The motor assembly thermal management subsystem (IV) further comprises a first three-way proportional valve (4), a second three-way proportional valve (14) and a third three-way proportional valve (17); the first three-way proportional valve (4) is arranged between the low-temperature radiator (2), the first electronic water pump (3), the water-cooled condenser (9) and the water medium transmission pipeline of the first cooler (8); the second three-way proportional valve (14) is arranged between the auxiliary drive four-in-one controller (7), the water medium transmission pipeline of the first cooler (8) and the four-way reversing valve (11); and the third three-way proportional valve (17) is arranged between the water medium transmission pipeline of the water-cooled condenser (9) and the passenger compartment warm air circulation subsystem (II).

4. The thermal management system for a pure electric commercial vehicle according to claim 3 is characterized in that: The battery thermal management subsystem (III) comprises a battery water heating PTC (10), a battery (12) and a second electronic water pump (13), wherein the above components are connected via a water medium circulation pipeline of the battery thermal management subsystem, and are connected to the motor assembly thermal management subsystem (IV) via a four-way reversing valve (11), and heat exchange is achieved with the passenger compartment refrigeration circulation subsystem (I) via a water medium transmission pipeline of a second cooler (20).

5. The thermal management system for a pure electric commercial vehicle according to claim 3 or 4, characterized in that: The passenger compartment warm air circulation subsystem (II) comprises a passenger compartment water heating PCT (18), a warm air core (23) and a third electronic water pump (26), and the above-mentioned components are connected through a water medium circulation pipeline of the passenger compartment warm air circulation subsystem and then connected in parallel in a water medium circulation pipeline of the motor assembly thermal management subsystem.

6. The thermal management system for a pure electric commercial vehicle according to claim 5, characterized in that: A first electronic expansion stop valve (19) is provided on the liquid inlet pipeline of the refrigerant transmission pipeline of the second cooler (20) of the passenger compartment refrigeration cycle subsystem (I), a second electronic expansion stop valve (21) is provided on the liquid inlet pipeline of the evaporator (22), and a third electronic expansion stop valve (25) is provided on the liquid inlet pipeline of the refrigerant transmission pipeline of the first cooler (8).

7. The thermal management system for a pure electric commercial vehicle according to claim 5, characterized in that: An electronic fan (1) is arranged on a low-temperature radiator (2) of the motor assembly thermal management subsystem (IV).

8. The thermal management system for a pure electric commercial vehicle according to claim 5, characterized in that: A blower (24) is provided on the evaporator (22) of the passenger compartment refrigeration circulation subsystem (I) and the warm air core (23) of the passenger compartment warm air circulation subsystem (II).

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