24 June 2014
Refrigerant with high GWP such as R-410A for residential and commercial heat pump systemsmight bereplaced with alternative refrigerants with low GWP. R-32 with the GWP of 675 might be one of strong candidates. Present study investigated the performances
of a residential and commercial heat pump system using R-32 and R-410A under full and partial load conditions. Optimum refrigerant charge amounts for both RAC and CAC systems using R-32were less by 20~30% than those for R-410A system. EER of R-32 was higher by approximately 3.8%~9.9% for RAC system and 3.3%~13.3 for CAC system than those of R-410A RAC and CAC system, respectively, when the capacities of the system using three
different refrigerants were set the same. SEERusing R-32 was larger by 6 -15% than that using R-410A, while SCOP using R-32 was larger by 2 – 12% for the RAC system. SEER using R-32 was larger by 1 -13% than that using R-410A, while SCOP using R-32 was larger
by 1 -4% for the CAC system.