Thermodynamic Cycle Performance Analyze And Comprehensive Evaluation Of New Working Fluid For Moderate/High Temperature Heat Pump

In fact, the study of moderate/high temperature pump working fluid is the application of heating temperature. By that way, the industrial waste heat which cannot be used directly can be cycled into useful thermal energy to support human life. At present, the research on moderate/high temperature pump system in domestic is still in its infancy. And one of the key problems of the research on moderate/high temperature pump is to find a new working medium that totally harmless to the ozone layer and unaffected to the greenhouse effect. This paper aims at finding a new high allround-performance moderate/high temperature pump working medium, and shows the theory of screening and comprehensive performance evaluation.In the theoretical cycle analysis, this article adopted the improved version which is more close to the actual cyclic process. It changes the adiabatic compression processes into three subprocesses, constant pressure heating, adiabatic compression, and constant heat release.In the beginning, the seventeen pure refrigerants was screened out in the condensation temperature range of70℃to100℃, compute their thermodynamic performance and analyze their cycling performance. Their comprehensive performance was finded that cannot fully meet the requirements of moderate/high temperature pump system, so the seventeen pure refrigerants was put in the study of the composition of the mixed refrigerants of moderate/high temperature pump.Secondly, The excellent comprehensive performance was treated as the starting point, screen out eleven new mixture working fluid that can be applied into moderate/high temperature pump system, FY1-FY6and FZ1-FZ5. And FZ1-FZ5has good environmental performance.Finally, the current evaluation methods are used to analyze one or several performances of the working fluids, so it’s hard to make a comprehensive evaluation. In this paper, in order to test the performances of the new mixture working fluids, we use eight commonly used performance indexes as original variables, and carry out mathematic means to the new mixture refrigerant selected by principal component analysis.