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Clum. Ens. C m . . 2Rll. Val. 187. pp. 129-147 Rcprinu available dinrrly from the publisher Photocopying pcrmittd by license only Q 2001 OPA (Ovcrwrr Publirhcrl A m i s t i o n ) N.V. Published by lianse undcr the Gordon and B m c h Scicnoc Publirhcn imprint.Airside performance for tube bank having N= 1-6 are reported in this study. Test results indicated that the heat transfer coefficients for N = l and N = 2 are comparable and the heat transfer coefficients increase with the number of tube row. For the same P,, PI, the heat transfer coefficients for the tube bank containing smaller diameter tube are higher than those of larger tube diameter for N 2 2 and is comparable for N= I. Comparisons of the heat transfer performance were made with several correlations. It is found that the Gnielinski correlation gives the besl predictive ability. For multiple-row heat exchangers, the predictive ability of the well-known Zukauskas correlation is also good. But the correlation under-estimate the present I-row heat exchangers. As a consequence, a slight modification to the iukauskas correlation is proposed that can extend its applicability in N= l and R~D < 1000. In addition, modification to the frictional performance of iukauskas correlation is also made. The mean deviation of the proposed frictional correlation is 11.2%.

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