The refrigeration cycle is a closed system, where coolant circulates. There are 4 main components in a refrigeration system, assist heat exchange and cause coolant changing between liquid and gas phase.
Gas phase coolant sucked by compressor and compressed (Low temperature Low pressure gas turns to High temperature High pressure gas). Then it moves to the condenser and is cooled down (High temperature High pressure gas turns to High temperature High pressure liquid). When the coolant reaches evaporator through an expansion valve, it will release heat and chill items inside evaporator (High temperature High pressure liquid turns to Low temperature Low pressure gas). Until now, a complete refrigeration cycle is finished. The low temperature low pressure gas will back to compressor again for next cycle.
Main Components and Functions
- Compressor: Heart of the refrigeration system, continue compress gas and turn it to High temperature High pressure gas.
- Condenser: Cool down the compressed gas to liquid phase.
- Expansion Valve: Metering device for coolant flow control.
- Evaporator: Heat exchange part, coolant chill items inside, boil off to gas phase.
As see the diagram, by connect different type of heat exchangers (evaporator), the refrigeration system will have different purpose and called names. So, for machines that come with refrigeration system, for cooling purpose, the working principle is same.