Abstract

The zeotropic blends comprise of R-407C and R-404A refrigerants and the pure R-134a were selected as a drop-in substitutes for R-22 in a water chiller under a quasi-steady state operation. When comparing the performance of the refrigerants with those of R-22, the results showed that R-407C, R-404A and R-134a reduced the cooling capacity up to (6) %, (6-12) % and (18) % respectively. R-134a and R-407C exhibited higher power consumption per ton of refrigeration than that experienced with the R-22 tests by (8-28) % and (7) % respectively. Whereas, R-404A showed a lower corresponding value than that of the R-22 by (9) %. The R-407C and R-404A showed a significant reduction in the actual (COP) by (19-23) % and (22-55) % respectively. The (COP) of the R-134a showed oscillation when compared with R-22 ranging from (22) % lower at high water inlet temperature to (29) % higher at low water inlet temperature.

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The article was added to IASJ on 2013-07-10

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