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Development of improved secondary refrigerants.

Author(s) : PEARSON S. F.

Type of article: Periodical article

Summary

The demise of CFC refrigerants has prompted new ideas for secondary refrigerant systems using ammonia plant in safe positions as the primary cold source. This review shows that water, for above freezing, and trichloroethylene at lower temperatures are the most desirable fluids, except for polydimethylsiloxane which is excellent but costly. However, liquid CO2 is also suggested. Though high pressures are required, it is an excellent heat transfer fluid, using small tubing and being virtually harmless. It is better still though if used not as a sensible heat fluid, but by evaporation at the end duty point and recondensation at the refrigeration plant, as in a cascade system but without the second compressor. Examples are given in comparison with an ammonia pump circulation cold store and an R22 and water circuit air-conditioning system. Both cases would probably have been cheaper using the ammonia/CO2 design. An actual system on these lines has been built for a small cold store in Scotland. D.W.H.

Details

  • Original title: Development of improved secondary refrigerants.
  • Record ID : 1994-1440
  • Languages: English
  • Subject: Figures, economy
  • Source: Inst. Refrig., Adv. Proof - 14 p.; 10 fig.; 10 tabl.; 8 ref.; append.
  • Publication date: 1993/03/04
  • Document available for consultation in the library of the IIR headquarters only.

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