Principle of Refrigeration System for Pure Electric Vehicles
Car air conditioning consists of a refrigeration system and a heating system. The function of the refrigeration system is to reduce the temperature inside the vehicle by absorbing heat when the refrigerant evaporates. The function of the heating system is to send cold air into the heater core for heating, and to send hot air into the cabin for heating.
Refrigeration system structural principle
(1) Composition
Principle of refrigeration system for pure electric vehicles
Car air conditioning consists of a refrigeration system and a heating system. The function of the refrigeration system is to reduce the temperature inside the vehicle by absorbing heat when the refrigerant evaporates. The function of the heating system is to send cold air into the heater core for heating, and to send hot air into the cabin for heating.
Refrigeration system structural principle
(1) Composition of refrigeration system
The air conditioning system is mainly composed of air conditioning compressor, condenser, evaporator, expansion valve, liquid storage drying tank, cooling fan, blower motor and control unit.
(2) Working principle of refrigeration system
The air-conditioning compressor of electric vehicles is an electric compressor, which is driven by high-voltage electricity (its rotation speed can be actively adjusted by the air-conditioning system, and its adjustment range is 0 ~ 4000r/min). The high-temperature and high-pressure refrigerant vapor discharged by the compressor passes through The high-pressure hose enters the condenser of the air conditioner. Since the temperature of the high-temperature and high-pressure refrigerant vapor is higher than the temperature of the air outside the car, the heat of the refrigerant vapor in the condenser is taken away by the air outside the car with the help of the condenser fan, so that the high-temperature and high-pressure refrigerant vapor condenses into higher temperature High pressure liquid.
It flows into the drying reservoir through a high-pressure hose. After drying and filtering, it flows through the expansion valve. Under the throttling effect of the expansion valve, the refrigerant turns into a low-temperature and low-pressure liquid and enters the evaporator of the car air conditioner. It vaporizes under a constant pressure and absorbs the heat in the air outside the evaporator tube, thereby circulating the inside of the car through the evaporator. The temperature of the air is reduced to cold air, which is sent into the car through the blower to reduce the air temperature inside the car.
The vaporized refrigerant vapor is sucked and compressed by the compressor, and turns into high-temperature and high-pressure refrigerant gas. It is pressed into the condenser of the automobile air conditioner through the high-pressure hose, completing a refrigeration cycle of the automobile air conditioner.
The refrigeration system achieves refrigeration through the heat absorption and heat release processes caused by the gas-liquid two-phase conversion of the refrigerant. Centering around the gas-liquid conversion of refrigerant, the refrigeration working cycle can be summarized into four processes: compression, heat release, throttling and heat absorption.
