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In an effort to improve the efficiency of residential heat pumps using alternative refrigerants, two nonazeotropic refrigerant mixtures (NARMs) were tested over a range of heat exchanger capacities to determine their cooling mode performance at U.S. Department of Energy (DOE) heat pump rating conditions of 82 degF (27.8 degC). The two mixtures, R32/R124 (30%/70%) and R143a/R124 (75%/25%), were selected on the basis of a previous study that screened refrigerant pairs using such factors as boiling point, stability, ozone-depletion potential (ODP), and coefficient of performance (COP) to determine suitable candidates for residential heat pump performance. Three refrigerant-side heat transfer enhancements were tested to determine their effects on overall system performance. Comparisons were made on the basis of COP as a function of capacity. Summarises the findings.

KEYWORDS: Testing, performance, refrigerants, mixtures, non azeotropic, heat exchangers, R143a, R124, efficiency, domestic, heat pumps, coefficient of performance.

Citation: ASHRAE Trans. 1993, vol.99, Part 2, Paper number 3700., 97-103, 9 figs., 17 refs.