摘要：In this study, the fin pitches of L-footed spiral finned tube heat exchangers were determined for maximimum performance index. The experiments were done at various fin pitches (f p = 2.4, 3.2, and 4.2 mm) under the range of high Reynolds numbers (5,000¨C15,000). The test sections had a parallel and counter cross-flo w arrangement having the number of tube row o f 2. The two working fluids were the ambient air and hot water. The performance indexes ( ¦Æ 1 , ¦Æ 2 , and ¦Æ 3 ) were used to analyze the experimental data at different fin pitches. The results show that the optimal fin pitches for L-footed spiral finned tube heat exchangers are 2.4 and 3.2 mm.
