CoC Oral Exam Preparation (Part – 9): Refrigeration & Air Conditioner


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 What is a Refrigerant?

  • Refrigerants are used as working substances in a Refrigeration systems.
  • Fluids suitable for refrigeration purposes can be classified into primary and secondary refrigerants.
  • Primary refrigerants are those fluids, which are used directly as working fluids, for example in vapour compression and vapour absorption refrigeration systems.
  • These fluids provide refrigeration by undergoing a phase change process in the evaporator.
  • Secondary refrigerants are those liquids, which are used for transporting thermal energy from one location to other. Secondary refrigerants are also known under the name brines or antifreezes

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