Sensible airside performance of fin-and-tube heat exchangers-data with larger diameter tube

Y. C. Liu, I. Y. Chen, R. Hu, B. C. Yang, Chi-Chuan Wang

Research output: Contribution to journalConference article

9 Scopus citations

Abstract

This study presents the airside performance of the fin-and-tube heat exchangers having plain fin geometry with a larger diameter tube (Dc = 16.88 mm). The effect of tube row and fin pitch on the airside are examined. It is found that the effect of fin pitch on the Colburn factor is negligible at N = 2. However, a notable drop of heat transfer performance is seen when the number of tube row is increased to eight. The effect of tube row on the friction factor is almost negligible. However, unlike those of friction factor, the Colburn factor reveals a different characteristic subject to the influence of the number of tube row. If the fin pitch is above a certain threshold value (Fp = 3̃4 mm), the influence of tube row on Colburn j-factor is very small. However, if the fin pitch is below this threshold value, the Colburn j-factor exhibits a considerable drop with the rise of the number of tube row. This phenomenon is especially pronounced at low Reynolds number region. It is likely that this phenomenon is related to the complex flow field interactions between the tube row and fin surfaces. The Wang et al.'s correlation (2000) gives fairly good predictive ability against the present friction factor but under-predicts the j-factor slightly. Based on the present database, a correlation is developed that can describe the j-factor with a 3.99% mean deviation and the f-factor with a 2.83% deviation.

Original languageEnglish
Pages (from-to)379-386
Number of pages8
JournalASHRAE Transactions
Volume114 PART 1
StatePublished - 17 Nov 2008
Event2008 Winter Meeting in New York City, New York of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. - New York City, NY, United States
Duration: 19 Jan 200823 Jan 2008

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