冷水相变能热泵系统的性能系数与经济性分析

Cold-water phase change energy heat pump system is a clean energy heating and cooling system, and coefficient of performance and economy are the main problems of cold-water phase change energy heat pump systems. According to the operation principle of the cold-water phase change energy heat pump system, the influence of ice thickness, cold-water flow rate and evaporation condensation temperature on the energy efficiency ratio (EER) of the system is analyzed by the control variable method. The operation and regulation scheme of the cold-water phase change energy heat pump system is proposed, and its economy is calculated. The results show that the effective EER of the system is maximum when the ice thickness is 8 mm. When the system heat production is 744 kW, the cold-water flow rate of phase change machine should be controlled at 70 t/h in the freezing period and 80 t/h in the deicing period. According to the cooling and heating loads in different time periods, the system operation and regulation are carried out, the operation cost is reduced by 4. 72% in winter and 29. 96% in summer, and the system energy efficiency ratio is increased by 5. 6% compared to traditional ways of running. The return rate of systematic investment is 15.27%, and the payback period is 7.67 years, showing good economy and energy saving.