摘要
采用效率-传热单元数法,针对顺流和逆流两种形式的污水套管输送换热(TDHT)系统,分析了换热效率,给出了效率计算公式和特点,指出顺流换热效率大于逆流,推荐TDHT系统采用顺流形式。提出了距离负荷比的概念,从技术和经济可行性方面给出了TDHT系统最小的距离负荷比。
Using the efficiency-number of heat transfer units method （ε-NTU method）, analyses the heat-transfer efficiencies of the parallel-flow and reverse-flow forms of thimble delivery heat-transfer （TDHT） and presents the calculation formulas and related characteristics. The results indicate that the parallel-flow is higher than reverse-flow in heat-transfer efficiency and is recommended to be used for a TDHT system. Presents the definition of distance-load ratio （DLR） and obtains the minimum DLR by the analysis of technical and economic feasibility.
出处
《暖通空调》
北大核心
2008年第3期68-72,共5页
Heating Ventilating & Air Conditioning
基金
北京市"供热
供燃气
通风及空调工程"重点实验室开放课题(编号:KF200503)
国家自然科学基金资助项目(编号:50578048)
关键词
城市污水
输送
换热效率
顺流
逆流
urban sewage, delivery, heat-transfer efficiency, parallel-flow, reverse-flow
