| Principle of uniformity of temperature difference field in heat exchanger |
| |
| 作者姓名： | 过增元 李志信 周森泉 熊大曦 |
| |
| 作者单位： | Department of Fngineering Mechanics，Tsinghua University，Beijing 100084，China，Department of Fngineering Mechanics，Tsinghua University，Beijing 100084，China，Department of Fngineering Mechanics，Tsinghua University，Beijing 100084，China，Department of Fngineering Mechanics，Tsinghua University，Beijing 100084，China |
| |
| 基金项目： | Project supported by the National Natural Science Foundation of China. |
| |
| 摘 要： | A principle of uniformity of temperature difference field (TDF) in heat exchangers is advanced.It states that the more uniform the temperature difference field,the higher the effectiveness of heat exchanger for a given NTU and C,.Analytical and numerical results on the uniformity of TDF and effectiveness of thirteen types of heat exchangers show the validity of the uniformity principle.Its further verification is given by the asymptotical solution of TDF in terms of a recurrence formula of heat transfer area distribution.The analyses of entropy generation caused by heat transfer indicate that the uniformity principle is based on the second law of thermodynamics.Two ways,redistributing heat transfer areas and varying the connection between tubes,are presented for the improvement of the uniformity of TDF and the consequent increase of effectiveness for crossflow heat exchangers.
|
Principle of uniformity of temperature difference field in heat exchanger |
| |
| GUO Zengyuan,LI Zhixin,ZHOU Senquan XIONG Daxi.Principle of uniformity of temperature difference field in heat exchanger[J].Science in China(Technological Sciences),1996(1). |
| |
| Authors: | GUO Zengyuan LI Zhixin ZHOU Senquan XIONG Daxi |
| |
| Abstract: | A principle of uniformity of temperature difference field (TDF) in heat exchangers is advanced.It states that the more uniform the temperature difference field,the higher the effectiveness of heat exchanger for a given NTU and C,.Analytical and numerical results on the uniformity of TDF and effectiveness of thirteen types of heat exchangers show the validity of the uniformity principle.Its further verification is given by the asymptotical solution of TDF in terms of a recurrence formula of heat transfer area distribution.The analyses of entropy generation caused by heat transfer indicate that the uniformity principle is based on the second law of thermodynamics.Two ways,redistributing heat transfer areas and varying the connection between tubes,are presented for the improvement of the uniformity of TDF and the consequent increase of effectiveness for crossflow heat exchangers. |
| |
| Keywords: | TDF of heat exchanger uniformity of TDF effectiveness entropy generation |
| 本文献已被 CNKI 等数据库收录！ |
