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Boiling heat transfer of refrigerant mixtures R404A and R407C in flooded evaporators.

[In German. / En allemand.]

Author(s) : LUKE A., KÖSTER P., KAUPMANN P., HÜBNER P., GORENFLO D.

Summary

Nucleate boiling heat transfer of refrigerant mixtures R404A and R407C in free convection on the surface of a horizontal copper tube with a smooth surface is studied experimentally for three boiling pressures (respectively 50, 20 and 10% of the critical pressure). The results for the lowest boiling temperatures of about -6 to -9 deg C are about 10% higher for the R404A than the values reported in the literature in comparison to R502, and about 10% lower for the R407C than the R22. For the analogously calculated values for an evaporation temperature of -40 deg C, the difference between the R404A and the R502 in only slightly lower than at -6 deg C, whether the difference between the R407C and the R22 nearly disappears.

Details

  • Original title: [In German. / En allemand.]
  • Record ID : 1996-3345
  • Languages: German
  • Source: DKV-Tagungsbericht 1995, Ulm.
  • Publication date: 1995/11/22
  • Document available for consultation in the library of the IIR headquarters only.

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