System performance with R407A, R407B, R407C compared to R22.

Hans Jørgen Høgaard Knudsen

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    The paper presents the results obtained by substituting R22 with mixtures of R32/R124/134a (R407A, R407B and R407C) in an existing refrigeration plant. The cooling water flow and cooling water inlet temperature together with the brine flow and brine inlet temperature have been kept on a value corresponding to the value when the refrigeration plant worked with R22.Primarily the capacity and the coefficient of performance have been measured.In addition the performance of the compressor given as volumetric and isentropic efficiency together with the mean heat transfer coefficient in the evaporator have been determined.The results show that for R407C both the cooling capacity and the COP are smaller than the cooling capacity and COP for R22. The cooling capacity for R407A and for R407B is lower then the cooling capacity for R22 for brine temperatures less than 0 C and higher than the capacity for R22 for brine temperatures higher than 0 C. The COP for R407A and 407B are lower than the COP for R22.The volumetriv and isentropic efficiency of the compressor are with mixtures higher than the volumetric and isentropic efficiency with R22.
    Original languageEnglish
    Title of host publication15. Nordiske Kølemødet/8. Nordiske Varmepumpedagene
    Place of PublicationReykjavik
    PublisherIslands Køleforening
    Publication date1997
    Publication statusPublished - 1997

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