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Author
Kim, M. H. | Domanski, P. A. | Didion, D. A.
Title
Performance of R-22 Alternative Refrigerants in a System With Cross-Flow and Counter-Flow Heat Exchangers.
Coporate
National Institute of Standards and Technology, Gaithersburg, MD
Sponsor
Department of Energy, Washington, DC
Report
NISTIR 5945, January 1997, 31 p.
Distribution
Available from National Technical Information Service
Keywords
air conditioning | heat pumps | heat transfer | refrigerants | refrigeration | thermodynamics
Abstract
This report presents results of performance tests of R-22 and four alternative fluids, R-134a, R-32/134a (30/70), R-407C, and R-410A, at operating conditions typical for a residential heat pump. The study was performed in an experimental breadboard water-to-water heat pump in which a water/ethylene glycol mixture was used as the heat-transfer fluid. The heat exchangers representing the indoor and outdoor coils were counter-flow and cross-flow, respectively. The cooling tests were conducted for all five fluids, and the heating tests were run for R-22 and R-407C. The report presents test results for the system and data characterizing the performance of the heat exchangers and compressor. The zeotropic mixtures, R-32/134a and R-407A had similar performance characteristics as R-22. At tests performed at the same capacity, R-410A had the highest Coefficient of Performance.