The vending machine cooling system is a vapour compression refrigeration system. It consists of four parts.
Refrigerator compressor: The refrigerator compressor pumps the vapor refrigerant from the evaporator and compresses it to high temperature and high pressure refrigerant.
Condenser: The high temperature and high pressure refrigerant flows through condenser coils, the heat is transferred to air by condenser fin and fan motor.
Capillary: The capillary is the expansion device. The high pressure liquid refrigerant from the condenser changes to low pressure liquid through capillary.
Evaporator coil: The low pressure liquid refrigerant flows through evaporator coil,absorbs the heats from the vending machine, the low pressure liquid refrigerant changes to low pressure vapor.