Near-azeotropic refrigerants as alternatives for R502.


Type of article: Article


Practical tests have been carried out on two near-azeotropic refrigerant mixtures developed as drop-in replacements for R502 in existing equipment. These are blends of R125, R290 and R22. The first was tested in several cube ice machines designed for R502 containing hermetic compressors, air-cooled condensers and capillary tubes or expansion valves. The tests indicated a small increase in ice production using the same power, but with a slightly higher discharge temperature than R502. The second, tested in a supermarket display cabinet, showed almost identical performance at both -40 and -30 deg C evaporation, but with a small increase in power at the lower temperature. Leakage tests indicate no significant changes in percentages of constituents. A third refrigerant blend of R125, R143a and R134a is recommended for zero ozone depletion. D.W.H.


  • Original title: Near-azeotropic refrigerants as alternatives for R502.
  • Record ID : 1993-3238
  • Languages: English
  • Source: ASHRAE Journal - vol. 35 - n. 2
  • Publication date: 1993/02
  • Document available for consultation in the library of the IIR headquarters only.


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