The operation characteristics of sewage source heat pump system and the analysis of its thermal economic benefits

The paper focuses on practical ways of water intake in the raw sewage source heat-pump system and the application of the new type heat-exchanger, and gives an analysis on its hydraulic regime of its heat-supply. The experimental data shows that the system operates well and the coefficient of performance approximates to 4.0. The actual cost of the sewage-source heat pump system is about ¥16.77/m 2 , and the yearly saving cost is about ¥444000, which proves a great energy-saving effect. According to its operation, it gives an analysis about its unit exergetic cost from the prospective of thermal economy. The calculation result shows that the unit exergetic cost in intermediate pump is the highest, and the average value is 7.8 W/W.