TY - JOUR
TI - Thermodynamic comparision of R744/R600a and R744/R600 used in mid-high temperature heat pump system
AU - Fan Xiao-Wei
AU - Ju Fu-Jun
AU - Zhang Xian-Ping
AU - Wang Fang
JN - Thermal Science
PY - 2014
VL - 18
IS - 5
SP - 1655
EP - 1659
PT - Article
AB - 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.