摘要
对污水源热泵系统中污水换热器进行了现场测试,依据测试数据分析污水换热器换热量、传热系数的衰减规律。依据测试数据和理论计算分析了污水换热器内污水侧对流换热热阻和污垢热阻的变化规律,以及各热阻在总热阻中的所占比例。结果表明:洁净的污水换热器投入运行225h后,实际换热量为初始值的43.8%;实际传热系数为440W/(m2.℃),为初始值的46.3%;污水侧对流换热热阻占总热阻的60%,污垢热阻占总热阻的20%。提高污水换热器换热效率,保持污水换热器换热量的稳定应从降低污水侧对流换热热阻着手。
Using field test data to analysis the variation of heat transfer of sewage heat exchanger and heat transfer coefficient. Based on test data and theoretical calculations to analysis the variation of the sewage side convection heat transfer thermal resistance and the fouling resistance, as well as thermal resistance in the proportion of the total thermal resistance. Results show that after running 255 hours the test heat transfer is 43.8% of the initial heat transfer; the test heat transfer coefficient is 46.3% of the initial heat transfer coefficient and the test value is 440W/（m^2·℃ ） ; the thermal resistance of the sewage side convective heat transfer is 60% of the total thermal resistance; the fouling resistance is 20% of the total thermal resistance. With the thermal resistance of the sewage side convective heat transfer reduced, heat transfer efficiency could be increased and the stability of the sewage heat exchanger could be improved.
出处
《流体机械》
CSCD
北大核心
2013年第5期55-59,14,共6页
Fluid Machinery
基金
新疆建设兵团科技局科技支撑计划项目(2011AB025)
江苏省科技支撑计划项目(BE2010645)
关键词
污水源热泵
污水换热器
污垢热阻
sewage source heat pump
sewage heat exchangers
fouling resistance
