What is the function of automobile evaporation box? What does the evaporator box of heating and air conditioning do?

The air conditioning of automobile cab includes cleaning, fresh air conditioning, sterilization, dehumidification, refrigeration and heating. The evaporation box belongs to the field of refrigeration and dehumidification, and its working medium is low temperature and low pressure refrigerant. Refrigerant absorbs the surrounding heat and gradually vaporizes from liquid to gas, which reduces the surrounding temperature and realizes refrigeration and dehumidification. The working medium in the warm air radiator is engine coolant, which circulates with the engine coolant and sends heat to the cockpit to realize heating.