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Update on secondary refrigerants for indirect systems.

Author(s) : MELINDER Å.

Summary

Indirect systems with secondary refrigerants or coolants have in Sweden long been used for ice rinks and heat pumps and are today increasingly used by supermarket chains for cold storage, cooling cabinets and freezers. The secondary refrigerant is then used to transport energy from the cooling object to the evaporator. In an indirect system it is possible to design the primary refrigeration unit in a compact way and with an extremely small refrigerant charge. The paper includes a comparison of liquids for cooling cabinets and freezers with an indirect system in a supermarket. The comparison shows that salt solutions can perform quite well from a thermophysical aspect, also for freezer applications. When choosing the secondary fluid, attention should also be given to material compatibility, toxicity, handling security and environmental pollution and the authors find that no secondary refrigerant is ideal for all types of applications. Much research is today also carried out with phase-changing secondary refrigerants, such as CO2 and ice-slurry.

Details

  • Original title: Update on secondary refrigerants for indirect systems.
  • Record ID : 2005-0885
  • Languages: English
  • Subject: Environment
  • Source: Advanced supermarket refrigeration/heat recovery systems. Workshop proceedings [CD-ROM].
  • Publication date: 2000/10/02

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