Paper No 354 – A study on the performance of heat pump by mixing ratio of isobutane/propane mixed refrigerants – 13th IEA Heat Pump Conference, Jeju, Korea
Natural refrigerants have global warming potential (GWP) and ozone depletion potential (ODP), but typical natural refrigerants have low COP, too. On the contrary, hydrocarbon refrigerants have high performance. In this study, using the characteristics of mixed refrigerants that can maintain a constant temperature difference during phase change, performance of the cycle according to the change in mixing ratio of isobutane and propane was calculated and measured. At outdoor temperature of 35? and indoor temperature 27?, COP of the cycle was maximized at isobutane ratio is near 0.8.