Abstract
A kind of carbon dioxide transcritical refrigeration cycle with vortex tube is proposed to replace traditional expansion valve to reduce the irreversible loss of the refrigeration system and improve its COP. The mathematic model of carbon dioxide transcritical refrigeration system is built to simulate the effect of the vortex tube performance on the COP. The results show that outlet temperature of gas cooler, the discharge pressure, cold mass fraction and isentropic efficiency of the vortex tube have significant effects on the COP improvement of the proposed system. COP increases with the increase of cold mass fraction, isentropic efficiency of the vortex tube and the gas cooler outlet temperature. However, COP decreases with the increase of the discharge pressure. When the cold mass fraction is 0.8, the COP improvement increases by 12%.
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