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Ideal properties for a refrigerant:
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Ideal properties for refrigerant

They may be listed as a
  • The high specific heat of vaporization
  • High suction gas density
  • Positively, but not excessive pressure, the boiling point and condensation conditions
  • The critical temperature and the triple point are far beyond the operating range
  • Chemically stable, compatible with construction materials and mixtures containing lubricants
  • Non-corrosive, non-toxic and non-flammable
  • High dielectric strength
  • Environmentally friendly
  • Low cost
Needless to say, none of the liquid has all these properties, and the choice of fluid for each specific application will always be a compromise.

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