Abstract
At present, an interesting research is to find promising environmentally-friendly refrigerants in auto-cascade refrigeration cycle. This paper proposed a refrigerant mixture of R744 and R290 due to its zero ozone depletion potential and negligible global warming potential. The properties of R744, R290 and the mixtures refrigerant were analyzed. And performances comparisons between R744, R290, R22 and R134a were investigated based on the simulation data. Then, the vapor-liquid phase equilibrium properties of mixture were calculated. And the conversion relations of total mole fraction, vapor phase mole fraction, liquid phase mole fraction, quality, equilibrium temperature and pressure were systematically analyzed. The results show that R744 and R290 are potential refrigerant. But each pure refrigerant has obvious disadvantage, it is a good choice that R744 and R290 are mixed together into non-azeotropic mixture, which is suitable for auto-cascade refrigeration cycle due to a large temperature glide during the phase changing.
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