抄録
Three heat pump ideal cycles of two stage compression with two stage expansion, three stage compression with single stage expansion and three stage condensation systems, all of which are considered as the performance improvement methods, are analyzed by introducing the evaluation formula of COP, and the physical property of working fluids. Temperature lift, condensation temperature, COP, working fluids and cycle name are taken as the analysis parameters. No losses for compressors, evaporator and condenser are assumed for ideal cycles. Analytical results are processed for graphical presentation and data bases are made for the performance comparison and evaluation of multistage systems.
