直接式与间接式污水源热泵系统供热性能分析

Analysis on Heating Performance of Direct and Indirect Sewage Source Heat Pump System

城市污水源热泵系统的性能系数是其经济性的重要评价指标.基于工程热力学的基本原理,对直接式和间接式系统供热工况的性能进行了分析与比较.结果表明:直接式污水源热泵系统的实际COP比间接系统高约0.3,污水温度与用户供水温度对系统性能影响较大,而系统污水或中介水温降、蒸发器或冷凝器平均温差对系统性能影响较小.

The coefficient of performance is one important evaluating indicator in the urban sewage heat pump system.Based on the engineering thermodynamics principle,the heating operating performance of direct and indirect systems was analyzed and compared.The results indicate that the actual COP of direct sewage source heat pump system is higher approximately 0.3 than that of indirect system,and the sewage temperature and the user supply water temperature have great influence on the system performance,while the temperature differences of sewage,intermediary water,the evaporator or the condenser has little influence.