Performance study on sewage-source heat pump in summer refrigerating condition in Shanghai area

Municical sewage has the characteristics of relative stable temperature, cool in summer and warm in winter, which is an excellent low temperature heat source, and shows a promising energy-saving prospect. Constructs a sewage-source heat pump system and employs the secondary effluent from a sewage plant in Shanghai as the heat source. Tests and verifies the refrigerating capacity and power consumption of the sewage-source heat pump system. Based on the verification and the actual temperature and flow rate of sewage in 2010, estimates the average COP, refrigerating capacity and emission reduction of the system in different months（July, August and September） of the summer condition. The results show that the fitting of the system refrigerating capacity and power consumption can reflect the actual operation condition, the average COPs of July, August and September are 4.98, 4.26 and 4.16, respectively, and the system has a high COP.