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System performance comparison of R407A and R502 in parallel and counterflow heat exchangers.

Author(s) : TRIEBE A. R., SNELSON W. K., HEARTY P. F., LINTON J. W., MURPHY F. T., CORR S.

Summary

In switching from parallel to counterflow in the evaporator the relative COP of R407A compared to R502 increased from 0.96 to 1.05 at an R502 evaporating temperature of -15 deg C and a condensing temperature of 43.3 deg C. At an R502 evaporating temperature of -25 deg C, the relative COP of R407A compared to R502 increased from 0.96 to 0.99. The relative COP increase could be traced to an increase in the compressor suction pressure which lead to a decrease in the compressor power consumption. In both parallel and counterflow, R407A transferred more of its latent heat energy, as compared to R502, in the first sections of the evaporator. When switching from parallel to counterflow in the condenser, the maximum relative COP increase of R407A compared to R502 was 3%.

Details

  • Original title: System performance comparison of R407A and R502 in parallel and counterflow heat exchangers.
  • Record ID : 1997-0120
  • Languages: English
  • Source: Proceedings of the 1996 Purdue International Refrigeration Conference.
  • Publication date: 1996/07/23
  • Document available for consultation in the library of the IIR headquarters only.

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