Performance Analysis of a Novel Double-Temperature Chilling Water Unit Using Large Temperature Glide Zeotropic Mixture

摘要

Accordingly to the properties of zeotropic mixture R32:R236fa, a novel double-temperature chilling water unit was proposal in this paper, this unit can produce two different temperature of chilled water (such as low temperature is 7 °C, high temperature is 16 °C). An experimental system is established to test the performance of the unit. The paper studied the effects of mass component concentrations of the zeotropic mixture and high-low temperature evaporator's source temperature on the performance of the unit. The results show that, when the inlet water temperature of the condenser is 32°C, outlet water temperature of the evaporator is 7°C and 16°C. The coefficient of performance (COP) of the unit can reach 4.14 when the mass component concentration of R32 is 60% and the COP of the unit increase with the increase of mass component concentration of R32 and the chilled water temperature.