What defines an indirect refrigeration system?

An indirect refrigeration system is characterized by the use of a secondary coolant, often referred to as a brine or chilled water, to transfer heat rather than relying solely on the refrigerant. In this setup, the refrigerant circulates within the system, absorbing heat from the secondary coolant, which is then responsible for cooling the primary space or substance. This design allows for greater flexibility and efficiency, as the secondary coolant can be used to transport heat over longer distances or to multiple locations.

By employing a secondary coolant, the system can maintain optimal operating conditions and better handle varying thermal loads. This approach is particularly beneficial in applications where direct contact with refrigerants might cause issues, or where temperature control is crucial over larger areas. Additionally, the use of water or other secondary coolants can have safety, cost, and environmental advantages.