Optimum mixture composition

Abstract

The exergy efficiency of any mixed refrigerant process depends on the mixture's constituents and their concentration. The exergy efficiency of MRC refrigerators will be high when a second liquid phase occurs in the evaporator. Liquid-liquid immiscibility is observed at low temperatures in multicomponent mixtures of nitrogen hydrocarbon, fluorocarbon hydrocarbon, fluorocarbon hydrochlorofluorocarbon and fluorocarbon hydrofluorocarbon refrigerants [34, 55, 87, 89]. This immiscibility can be exploited to obtain a near-constant temperature evaporation with mixtures, as shown in Figs. 3.4 and 3.6 with both binary and multicomponent mixtures.