Estimation of Transient Heat-Transfer Characteristics on the Fin of Plate Finned-Tube Heat Exchangers

• Main Authors: Jui-Ming Yu, 游瑞銘
• Other Authors: Han-Taw Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/87045963069526482565

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 95 === The present study applies the finite difference method in conjunction with the Laplace transform method, the least-squares method and the experimental temperature data to predict the transient average heat transfer coefficient, transient heat flux and transient fin efficiency on the rectangular vertical fin of one-tube plate finned-tube heat exchangers. It can be found from the previous study that the heat transfer coefficient on the rectangular fin is very non-uniform. Thus the whole plate fin is divided into several sub-fin regions in order to predict the transient average heat transfer coefficient, transient heat flux and transient fin efficiency on the fin from the knowledge of the experimental fin temperature. In order to validate the accuracy of the present inverse scheme, the present study will simulate this problem. The transient heat-transfer characteristics on the rectangular vertical fin of one-tube plate finned-tube heat exchangers can be predicted using the present inverse scheme in conjunction with the experimental measured temperatures. The results show that the transient heat-transfer characteristics will increase with time and slowly approach its corresponding steady state values. Thus it shows that the estimated results of the present inverse scheme have good reliability and accuracy.