Performance of R-22 Alternative Refrigerants in a System With Cross-Flow and Counter-Flow Heat Exchangers.
Performance of R-22 Alternative Refrigerants in a System
With Cross-Flow and Counter-Flow Heat Exchangers.
Kim, M. H.; Domanski, P. A.; Didion, D. A.
NISTIR 5945; 31 p. January 1997.
Sponsor:Department of Energy, Washington, DC
Available from: National Technical Information Service
Order number: PB97-138259
air conditioning; heat pumps; heat transfer;
refrigerants; refrigeration; thermodynamics
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.