Abstract: An experimental, water-to-water, breadboard heat pump (that is one designed to be easily reconfigured) was constructed for comparison
of pure R22 to the refrigerant mixtures R22/R114 and R13/R12. Three evaporator configurations were extensively tested. In all cases, the best mixture
outperformed R22. The best efficiency with R22/R114 was 32% higher and with R13/R12 was 16% higher than the best efficiency measured with R22.
Other observerations were, first, mixtures can take advantage of heat exchanger efficiency that, in a gliding temperature application, a pure
refrigerant is incapable of utilizing. Secondly, heat exchange between the condensed and evaporating refrigerant is beneficial to some mixed refrigerants.
Finally, mixtures exhibit nonlinearity of enthalpy versus temperature in the two phase region which has significant impact on both heat exchanger and cycle design.
Keywords: refrigerant mixture, nonazeotropic refrigerant mixture, NARM, R-22, R-12, R-13, R-113, water to water heat pump
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