抄録
Theoretical cycle analysis was done on compression heat pump system, which uses water -ethanol mixture as a working fluid. Working temperature level was set below 100°C. At the low temperature region the pressure of the suction gas is low, and the influence of mechanical loss of the compressor on coefficient of performance (COP) will be large. Relations of COPs and mechanica1 loss of the compressor has been made clear on the ethanol mol fraction range (0 to 1). Water-ethanol mixture cycle can increase COP and lower the working temperature compared with a water cycle. Another effect of adding ethanol is to decrease the irreversible loss at the heat exchangers. As the water -ethanol mixture is a non-azeotropic mixture, temperature changes in two phase regions. This characteristic is valid when a second coolant is used.
