22 May 2002
The characteristics of CO2 transcritical cycle heat pump such as the optimum high pressure, the maximum COP, the influence of evaporating temperature and outlet refrigerant temperature of gas cooler are analyzed in this paper. More over, through the analysis of expanding process, the ideal CO2 expander demands are provided and the design technical direction of CO2 is also pointed out. In addition, CO2 transcritical cycle water source heat pump for hot water space heating is studied theoritically. By the comparison with the coal combustion boiler for space heating, we find that the first energy utilization rate of CO2 transcritical cycle water source heat pump is higher. Furthermore, the combination of radiant ceiling panels and CO2 transcritical cycle heat pump is analyzed and conclude that it is a nice and feasible two-win method in techniques. And by calculation and comparison, we obtain that CO2 transcritical cycle with both expander and internal heat exchanger is the most suitable cycle to incorporate with the radiant ceiling panels if it is applied for both heating in winter and cooling in summer.