Share

The development of a drop-in replacement for R502.

Author(s) : PEARSON S. F.

Type of article: Periodical article

Summary

As no manufacturer appeared likely in the near future to produce a replacement refrigerant for R502 in existing systems, the author reports on the development of a mixture of existing fluids. The criteria included low discharge temperature, compatibility with existing lubricants, and an energy efficiency at least equal to R502. The fluids judged most promising were R125, R22, R218, and R290, of which only R125 was not immediately available at a reasonable price. Various binary mixtures were tested. The inclusion of R218 reduced discharge temperature and gave better motor cooling. Mixtures containing R218 and 6% of R290 are not inflammable. Finally, ternary mixtures were tried and two of R22/R218/R290 are now marketed. One with 39% R218 producing a lower discharge temperature than R502, the other with 20% R218 is a little hotter but less costly. These are not azeotropes, but behave as near-azeotropes. Details of leakage separation and charging techniques are discussed. D.W.H.

Details

  • Original title: The development of a drop-in replacement for R502.
  • Record ID : 1992-2581
  • Languages: English
  • Source: Inst. Refrig., Adv. Proof - 9 p.; 15 fig.; 1 tabl.; 4 ref.
  • Publication date: 1992/01/09
  • Document available for consultation in the library of the IIR headquarters only.

Links


See the source

Indexing