• 作者： Lin, W. W.; Lee, D. J.
• 中文摘要： 本文利用Kim等人提出之關連式, 對平板鰭管式熱交換器效能進行第二定律分析, 從而求出熵產生速率, 及不同條件下之最適雷諾數與最小熵生成量。在固定的熱負荷下, 平板鰭管式熱交換器應擁有較小之管間距、較大之管群數目、較原之鰭片、及較大之板鰭間距, 而垂直於空氣流動方向具有最佳之管間距與管群數目。
• 英文摘要： Second-law analysis on the heat exchanger having plain fins on a staggered array of circular tubes was conducted on the basis of correlations of Nusselt number and friction factor proposed by Kim et al. (1998), from which the entropy generation rate was evaluated. Optimum Reynolds number and minimum entropy generation rate were found over different operating conditions. At a fixed heat duty, within the valid of range of Kim et al.'s correlation, the plain fin-and-tube heat exchanger should exhibit a small tube spacing in air flow direction, a large number of tube rows, and large in thickness and the spacing between adjacent plain fins. There is an optimal ratio between tube spacing normal to air flow direction and the tube diameter.
• 中文關鍵字： 第二定律; 平板鰭; 熱交換器; 最適雷諾數
• 英文關鍵字： Second-Law; Plain Fin; Heat Exchanger; Optimal Reynolds Number