CN113942370A - Automobile air conditioning system and working method thereof - Google Patents
Automobile air conditioning system and working method thereof Download PDFInfo
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- CN113942370A CN113942370A CN202111391516.XA CN202111391516A CN113942370A CN 113942370 A CN113942370 A CN 113942370A CN 202111391516 A CN202111391516 A CN 202111391516A CN 113942370 A CN113942370 A CN 113942370A
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- heat exchanger
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- heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3227—Cooling devices using compression characterised by the arrangement or the type of heat exchanger, e.g. condenser, evaporator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00478—Air-conditioning devices using the Peltier effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3228—Cooling devices using compression characterised by refrigerant circuit configurations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/02—Moistening ; Devices influencing humidity levels, i.e. humidity control
- B60H3/024—Moistening ; Devices influencing humidity levels, i.e. humidity control for only dehumidifying the air
Abstract
The technical scheme of the invention discloses an automobile air conditioning system and a working method thereof, wherein the automobile air conditioning system comprises a heat pump module; the outdoor heat exchange module and the air-conditioning box are respectively connected with the heat pump module, wherein a semiconductor cooling and heating device is arranged in the air-conditioning box, and the semiconductor cooling and heating device can realize simultaneous work of cooling and heating. The automobile air conditioning system has flexible application scenes, and can be used on fuel automobiles, electric automobiles and engineering machinery. The problem of winter engine water temperature not enough for passenger cabin or defrosting provides the heat is solved. The high-temperature refrigerant is enhanced to dissipate heat through the cooling liquid, the ambient air and the low-temperature refrigerant, and the performance and the energy efficiency of the system during refrigeration are improved. The heat of the engine or the motor is absorbed through the heat exchange between the cooling liquid and the low-temperature refrigerant, and the performance and the energy efficiency of the system during heating are improved. The semiconductor cooling and heating device is used for dehumidifying, so that the comfort of the system is improved, and the working time of the compressor is reduced.
Description
Technical Field
The invention relates to the technical field of automobile air-conditioning systems, in particular to an automobile air-conditioning system and a working method thereof.
Background
In cold winter, the passenger compartment of the automobile needs to be heated to improve the comfort of the passenger compartment.
For fuel oil vehicles, because the temperature of the engine is low, the hot water generated by the engine is not enough to provide enough heat for the interior of the vehicle, and the heating effect in the vehicle is poor. Especially, at the initial stage of starting the engine, heat can hardly be supplied to the interior of the automobile, so that the heating effect in the automobile is avoided, and at the moment, if the window is frosted, the defrosting effect is very poor.
For electric vehicles, heating needs to be done in other ways as well, since no engine provides a heat source. At present, the automobile is mainly heated by PTC (positive temperature coefficient resistor) in winter, the heat efficiency is low, and the power consumption is large. Or a heat pump system is adopted for heating, the heat pump system has high energy efficiency, but the energy efficiency is reduced in a low-temperature environment and even the heat pump system cannot work normally.
When the automobile air conditioner dehumidifies in spring and autumn, refrigeration and heating are needed to work simultaneously, so that the dehumidification effect can be guaranteed, and the comfort is not influenced.
If dehumidification is performed only by cooling, the temperature in the vehicle is reduced, and the passengers feel colder.
If only heating dehumidification is used, the dehumidification effect is poor, and passengers feel hot.
In the existing automobile air conditioning system, an air conditioning compressor is used for refrigerating, an engine waste heat is used for heating (a fuel vehicle) or a heat pump system is used for adding an indoor condenser for heating (an electric automobile) or PTC heating is used for heating, so that the compressor must be started during dehumidification.
Disclosure of Invention
The invention solves the problem that the compressor must be started when the refrigeration and heating work simultaneously in the existing automobile air conditioning technology; the problems of performance improvement and energy efficiency improvement during cooling in summer and heating in winter are solved.
In order to solve the above technical problem, a technical solution of the present invention provides an air conditioning system for a vehicle, including:
a heat pump module;
an outdoor heat exchange module and an air conditioning box which are respectively connected with the heat pump module, wherein,
and a semiconductor cooling and heating device is arranged in the air conditioning box, and can realize simultaneous work of cooling and heating.
Optionally, the heat pump module comprises a compressor, a reversing valve connected to the outlet of the compressor, a gas-liquid separator connected to the inlet of the compressor, and a fifth heat exchanger connected between the reversing valve and the gas-liquid separator.
Optionally, the outdoor heat exchange module includes a first heat exchanger connected between the fifth heat exchanger and the reversing valve, a first fan and a radiator arranged beside the first heat exchanger, a sixth heat exchanger installed between the first heat exchanger and the reversing valve, and a radiator connected with the sixth heat exchanger, where the radiator and the sixth heat exchanger are connected to a coolant loop of an external engine or an electric motor or a hydraulic oil loop of an engineering machine.
Optionally, the air conditioning cabinet includes a third heat exchanger and a fourth heat exchanger respectively installed at two ends of the semiconductor cooling and heating device, a second fan is disposed beside the third heat exchanger, a second heat exchanger is further installed between the third heat exchanger and the fourth heat exchanger, two ends of the second heat exchanger are respectively connected to the reversing valve and the fifth heat exchanger, and a throttling element is installed between the second heat exchanger and the fifth heat exchanger.
In order to solve the technical problem, the technical solution of the present invention further provides a working method of an automotive air conditioning system, wherein the working method comprises:
when the semiconductor cold and hot device is required to be in a refrigeration and dehumidification mode in summer, the semiconductor cold and hot device is used for respectively controlling the third heat exchanger and the fourth heat exchanger to refrigerate and heat, and the input current of the semiconductor cold and hot device is adjusted to control the refrigeration and heating power of the third heat exchanger and the fourth heat exchanger;
when the heating and dehumidifying mode is needed in winter, the fourth heat exchanger is controlled to heat through the semiconductor cooling and heating device, and the heating power of the fourth heat exchanger is controlled by adjusting the input current of the semiconductor cooling and heating device.
Optionally, a refrigeration circulation mode is also included, and the circulation route of the refrigerant is compressor-reversing valve-sixth heat exchanger-first heat exchanger-fifth heat exchanger-throttling element-second heat exchanger-reversing valve-gas-liquid separator-compressor.
Optionally, a heating circulation mode is further included, and the circulation route of the refrigerant is compressor-reversing valve-second heat exchanger-throttling element-fifth heat exchanger-first heat exchanger-sixth heat exchanger-reversing valve-gas-liquid separator-compressor.
The technical scheme of the invention has the beneficial effects that:
the automobile air conditioning system has flexible application scenes, and can be used on fuel automobiles, electric automobiles and engineering machinery. The problem of winter engine water temperature not enough for passenger cabin or defrosting provides the heat is solved. The high-temperature refrigerant is enhanced to dissipate heat through the cooling liquid, the ambient air and the low-temperature refrigerant, and the performance and the energy efficiency of the system during refrigeration are improved. The heat of the engine or the motor is absorbed through the heat exchange between the cooling liquid and the low-temperature refrigerant, and the performance and the energy efficiency of the system during heating are improved. The semiconductor cooling and heating device is used for dehumidifying, so that the comfort of the system is improved, the working time of the compressor is reduced, and the service life of the system is prolonged. And the modular design is adopted, so that the generalization of the product is facilitated, and the application range of the product is expanded.
Drawings
Fig. 1 is a schematic structural diagram of an automotive air conditioning system according to an embodiment of the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
Referring to fig. 1, an embodiment of an air conditioning system for a vehicle is shown, wherein the air conditioning system comprises a heat pump module; the outdoor heat exchange module and the air conditioning box are respectively connected with the heat pump module, wherein a semiconductor cooling and heating device 5 is arranged in the air conditioning box, and the semiconductor cooling and heating device 5 can realize simultaneous work of cooling and heating.
In this embodiment, the heat pump module includes a compressor 1, a reversing valve 2 connected to an outlet of the compressor 1, a gas-liquid separator 3 connected to an inlet of the compressor 1, and a fifth heat exchanger 15 connected between the reversing valve 2 and the gas-liquid separator 3.
In this embodiment, the outdoor heat exchange module includes a first heat exchanger 11 connected between a fifth heat exchanger 15 and the reversing valve 2, a first fan 6 and a radiator 8 disposed beside the first heat exchanger 11, a sixth heat exchanger 16 installed between the first heat exchanger 11 and the reversing valve 2, and the radiator 8 connected to the sixth heat exchanger 16, where the radiator 8 and the sixth heat exchanger 16 are connected to a coolant loop of an external engine or an external motor or a hydraulic oil loop of an engineering machine.
In this embodiment, the air conditioning cabinet includes a third heat exchanger 13 and a fourth heat exchanger 14 respectively installed with both ends of the semiconductor cooling and heating device 5, a second fan 7 is disposed beside the third heat exchanger 13, a second heat exchanger 12 is further installed between the third heat exchanger 13 and the fourth heat exchanger 14, both ends of the second heat exchanger 12 are respectively connected to the reversing valve 2 and the fifth heat exchanger 15, and the throttling element 4 is installed between the second heat exchanger 12 and the fifth heat exchanger 15.
The following description is provided to further appreciate the features and functionality of the present invention.
The embodiment also provides a working method of the automobile air conditioning system, wherein the working method comprises the following steps:
when the cooling and dehumidifying mode is needed in summer, the semiconductor cooling and heating device 5 controls the third heat exchanger 13 and the fourth heat exchanger 14 to cool and heat respectively, and the input current of the semiconductor cooling and heating device 5 is adjusted to control the cooling and heating power of the third heat exchanger 13 and the fourth heat exchanger 14.
When the heating and dehumidifying mode is needed in winter, the fourth heat exchanger 14 is controlled to heat through the semiconductor cooling and heating device 5, and the heating power of the fourth heat exchanger 14 is controlled by adjusting the input current of the semiconductor cooling and heating device 5.
In the embodiment, the refrigeration cycle mode is also included, and the circulation route of the refrigerant is compressor 1-reversing valve 2-sixth heat exchanger 16-first heat exchanger 11-fifth heat exchanger 15-throttling element 4-second heat exchanger 12-reversing valve 2-gas-liquid separator 3-compressor 1.
In the embodiment, the heating circulation mode is also included, and the circulation route of the refrigerant is compressor 1-reversing valve 2-second heat exchanger 12-throttling element 4-fifth heat exchanger 15-first heat exchanger 11-sixth heat exchanger 16-reversing valve 2-gas-liquid separator 3-compressor 2.
The present invention will be described in detail below.
The embodiment provides an automobile air conditioning system. The air conditioning system adopts R744 (carbon dioxide) or R290 (propane) or R134a or other working media as the refrigerant. The air conditioning system comprises a heat pump module, an outdoor heat exchange module, an air conditioning box module and the like. The air conditioning system can be used on a fuel automobile, an electric automobile or engineering machinery and provides functions of cooling, heating, dehumidifying (defogging) and the like for a passenger cabin.
The heat pump module comprises a compressor 1, a refrigerant reversing valve 2, an intermediate heat exchanger (namely a fifth heat exchanger 15), a throttling element 4, a gas-liquid separator 3 and the like. Wherein the compressor 1 is a mechanically driven compressor (for fuel vehicles, driven by an engine) or an electrically driven compressor (both fuel vehicles and electric vehicles are available). The refrigerant reversing valve 2 can be a four-way valve, and can also realize the reversing function by combining a three-way valve or a stop valve. The throttling element can be an electronic expansion valve or a throttling hole pipe. The fifth heat exchanger 15 is used to exchange heat between the high-temperature and high-pressure refrigerant before entering the expansion valve (i.e., the throttling element 4) and the low-temperature and low-pressure refrigerant at the outlet of the evaporator, thereby improving the energy efficiency ratio of the system.
The outdoor heat exchange module comprises an outdoor heat exchanger (namely a first heat exchanger 11), a radiator 8, a water-gas heat exchanger (namely a sixth heat exchanger 16) and a first fan 6; for heat exchange (heat dissipation or absorption) between the refrigerant and the outdoor air, heat exchange (heat dissipation) between the coolant and the outdoor air, and heat exchange between the refrigerant and the coolant.
The air conditioning cabinet comprises a second fan 7, an indoor heat exchanger (namely, a second heat exchanger 12), a heat pipe heat exchanger (namely, a third heat exchanger 13), a heat pipe heat exchanger (namely, a fourth heat exchanger 14), a semiconductor cooling and heating device 5 and the like.
The air conditioning system can be used on a construction machine, such as a truck crane. Air conditioning systems are provided in both a chassis cab and an upper cab (i.e., a part for performing a lifting operation) of the automobile crane. The air conditioning system of the automobile crane basically adopts compression refrigeration and fuel oil heating technology. When the system is used for the automobile crane to get on the bus, the compressor is an electrically driven compressor and is driven by the electric power system of the crane. The hydraulic compressor can also be driven by a hydraulic system of the crane. The sixth heat exchanger 16 is used for heat exchange of the refrigerant and the hydraulic oil.
The air conditioning system of the present embodiment has the following operation modes:
1. refrigeration cycle: the refrigerant circulation route comprises a compressor 1, a reversing valve 2, a sixth heat exchanger 16, a first heat exchanger 11, a fifth heat exchanger 15, a throttling element 4, a second heat exchanger 12, a reversing valve 2, a gas-liquid separator 3 and the compressor 1.
The high-temperature and high-pressure refrigerant at the outlet of the compressor 1 is subjected to first heat exchange (heat dissipation) with the cooling liquid through the sixth heat exchanger 16, so that the temperature of the refrigerant is reduced for the first time; then enters the first heat exchanger 11 to perform second heat exchange (heat dissipation) with ambient air, and the temperature is reduced for the second time; and the refrigerant continuously enters the fifth heat exchanger 15 to perform third heat exchange (heat dissipation) with the low-temperature refrigerant, and the temperature is reduced for the third time. The refrigerant is throttled by the throttling element 4 and then changed into low-temperature and low-pressure refrigerant, and the refrigerant exchanges heat (absorbs heat) with air in the vehicle through the second heat exchanger 12 to cool the passenger compartment. The temperature of the refrigerant at the outlet of the compressor 1 is reduced for three times, so that the purpose of fully radiating the refrigerant is achieved, and the performance and the energy efficiency ratio of the system are improved.
When the electric compressor is adopted, the refrigerating capacity of the system can be adjusted by adjusting the rotating speed of the electric compressor and the opening degree of the throttling element.
2. The heating cycle is that a refrigerant circulation route is a compressor 1, a reversing valve 2, a second heat exchanger 12, a throttling element 4, a fifth heat exchanger 15, a first heat exchanger 11, a sixth heat exchanger 16, a reversing valve 2, a gas-liquid separator 3 and a compressor 2.
The high-temperature and high-pressure refrigerant at the outlet of the compressor 1 is subjected to primary heat exchange (heat dissipation) with air in the vehicle interior through the second heat exchanger 12 to heat the passenger compartment. Then the refrigerant is throttled by the throttling element 4 and becomes low-temperature and low-pressure refrigerant, and the refrigerant exchanges heat (absorbs heat) with ambient air through the first heat exchanger 11 to increase the temperature for the first time; and then enters the sixth heat exchanger 16 to exchange heat (absorb heat) with the cooling liquid, and the temperature is increased for the second time. And the performance and the energy efficiency ratio of the system are improved by absorbing heat twice. When the engine or motor coolant temperature rises to a sufficient temperature, the first fan 6 stops operating. The air conditioning system can meet the heating requirement of the passenger compartment only by absorbing heat from the cooling liquid through the sixth heat exchanger 16.
When the electric compressor is adopted, the refrigerating capacity of the system can be adjusted by adjusting the rotating speed of the electric compressor and the opening degree of the throttling element.
At the very low ambient temperature, for example-50 ℃, the heating performance of the air conditioning system is poor, and the temperature of the cooling liquid is not enough to provide heat for the air conditioning system, at this time, the heating performance of the air conditioning system can be improved by connecting auxiliary heating devices (such as PTC) in series or in parallel in the cooling liquid loop and providing heat for the air conditioning system through the sixth heat exchanger 16.
3. Refrigerating and dehumidifying in summer
Refrigeration and dehumidification: when the refrigeration load is higher in summer, the dehumidification mode is the same as the refrigeration mode.
Low-load refrigeration dehumidification: with the reduction of the cooling load, the temperature of the cool air passing through the second heat exchanger 12 is too low, and the temperature of the outlet air needs to be increased according to the requirement of comfort. At this time, the semiconductor cooling and heating device 5 is turned on, the third heat exchanger 13 cools, and the fourth heat exchanger 14 heats. Based on the characteristics of the semiconductor cooling/heating device 5, the heating capacity of the fourth heat exchanger 14 — the cooling capacity of the third heat exchanger 13 at this time is equal to the input power of the semiconductor cooling/heating device 5. The semiconductor cooling-heating device 5 operates as a heater. By adjusting the input current of the semiconductor cold and hot device 5, the cooling and heating power of the third heat exchanger 13 and the fourth heat exchanger 14 can be controlled.
4. Winter heating and dehumidifying
Heating and dehumidifying: as the cooling load decreases until there is no demand, the heating load increases. The air conditioning compressor is turned off and the refrigerant cycle is stopped. After the air is cooled and dehumidified by the third heat exchanger 13, the air is heated and warmed by the fourth heat exchanger 14. By adjusting the input current of the semiconductor cold and hot device 5, the cooling and heating power of the third heat exchanger 13 and the fourth heat exchanger 14 can be controlled.
In conclusion, the automobile air conditioning system has flexible application scenes, and can be used on fuel automobiles, electric automobiles and engineering machinery. The problem of winter engine water temperature not enough for passenger cabin or defrosting provides the heat is solved. The high-temperature refrigerant is enhanced to dissipate heat through the cooling liquid, the ambient air and the low-temperature refrigerant, and the performance and the energy efficiency of the system during refrigeration are improved. The heat of the engine or the motor is absorbed through the heat exchange between the cooling liquid and the low-temperature refrigerant, and the performance and the energy efficiency of the system during heating are improved. The semiconductor cooling and heating device is used for dehumidifying, so that the comfort of the system is improved, the working time of the compressor is reduced, and the service life of the system is prolonged. And the modular design is adopted, so that the generalization of the product is facilitated, and the application range of the product is expanded.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. An automotive air conditioning system, comprising:
a heat pump module;
an outdoor heat exchange module and an air conditioning box which are respectively connected with the heat pump module, wherein,
and a semiconductor cooling and heating device is arranged in the air conditioning box, and can realize simultaneous work of cooling and heating.
2. The vehicle air conditioning system of claim 1, wherein the heat pump module includes a compressor, a reversing valve connected to the compressor outlet, a gas-liquid separator connected to the compressor inlet, and a fifth heat exchanger connected between the reversing valve and the gas-liquid separator.
3. The automobile air conditioning system according to claim 2, wherein the outdoor heat exchange module comprises a first heat exchanger connected between the fifth heat exchanger and the reversing valve, a first fan and a radiator arranged beside the first heat exchanger, a sixth heat exchanger arranged between the first heat exchanger and the reversing valve, and a radiator connected with the sixth heat exchanger, wherein the radiator and the sixth heat exchanger are connected to a coolant loop of an external engine or motor or a hydraulic oil loop of an engineering machine.
4. The automobile air conditioning system according to claim 2, wherein the air conditioning box comprises a third heat exchanger and a fourth heat exchanger which are respectively installed at two ends of the semiconductor cooling and heating device, a second fan is arranged beside the third heat exchanger, a second heat exchanger is further installed between the third heat exchanger and the fourth heat exchanger, two ends of the second heat exchanger are respectively connected to the reversing valve and the fifth heat exchanger, and a throttling element is installed between the second heat exchanger and the fifth heat exchanger.
5. An operating method of an automotive air conditioning system, characterized in that the operating method is as follows:
when the semiconductor cold and hot device is required to be in a refrigeration and dehumidification mode in summer, the semiconductor cold and hot device is used for respectively controlling the third heat exchanger and the fourth heat exchanger to refrigerate and heat, and the input current of the semiconductor cold and hot device is adjusted to control the refrigeration and heating power of the third heat exchanger and the fourth heat exchanger;
when the heating and dehumidifying mode is needed in winter, the fourth heat exchanger is controlled to heat through the semiconductor cooling and heating device, and the heating power of the fourth heat exchanger is controlled by adjusting the input current of the semiconductor cooling and heating device.
6. The operating method of an air conditioning system for vehicles according to claim 5, further comprising a refrigeration cycle mode, wherein the refrigerant is circulated through a path of a compressor-direction changing valve-sixth heat exchanger-first heat exchanger-fifth heat exchanger-throttling member-second heat exchanger-direction changing valve-gas-liquid separator-compressor.
7. The operating method of an air conditioning system for vehicles according to claim 5, further comprising a heating circulation mode in which a refrigerant circulates through a compressor-reversing valve-second heat exchanger-throttling member-fifth heat exchanger-first heat exchanger-sixth heat exchanger-reversing valve-gas-liquid separator-compressor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114435073A (en) * | 2022-03-04 | 2022-05-06 | 三一重机有限公司 | Cab air conditioning system, control method thereof and engineering machinery |
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| CN108705915A (en) * | 2018-08-02 | 2018-10-26 | 威马智慧出行科技（上海）有限公司 | A kind of heat management system for electric vehicle |
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| CN114435073B (en) * | 2022-03-04 | 2023-11-21 | 三一重机有限公司 | Cab air conditioning system, control method thereof and engineering machinery |
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