The central air conditioning system consists of one or more cooling and heating source systems and multiple air conditioning systems. The principle of liquid vapor refrigeration provides the required cooling capacity for the air conditioning systems to offset the cooling load of the indoor environment; the heating system supplies the necessary heat to the air conditioning systems to counteract the heat load of the indoor environment.

The refrigeration system is a crucial component of the central air conditioning system, and its type, operation method, and structural form directly affect the economy, efficiency, and rationality of the central air conditioning system during operation.