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The mid-high temperature heat pump provides hot water at a relatively high   temperature using some industrial waste heat as its source. Now, the main   refrigerants in this application are CFC114, HCFC123, and HCFC142b, etc.,   which are scheduled to be phased out due to their high ozone depletion   potential and global warmth potential. Some studies have been conducted to   find an eco-friendly alternative. In this paper, the natural non-azeotropic   mixtures R744/R600a and R744/R600 are analyzed as alternatives. The   performance of the heat pump system using new mixture is discussed and   compared with those with CFC114, HCFC123, and HCFC142b. Under the given   operating conditions, the maximum heating COP should occur at the mass   fractions of 18/82 for R744/R600a and 10/90 for R744/R600. Both of their COP   are higher than those with the refrigerants of CFC114, HCFC123, and   HCFC142b. The COP and volumetric heating capacity of the system with   R744/R600a are superior to those with R744/R600

Thermodynamic comparision of R744/R600a and R744/R600 used in mid-high temperature heat pump system