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Prediction of cooling-coil performance under condensing conditions
Authors:D R Mirth and S Ramadhyani
Institution:

Ray W. Herrick Laboratories, School of Mechanical Engineering, Purdue University, West Lafayette, IN, USA

Abstract:The possibility of predicting chilled-water cooling-coil performance under condensing conditions using dry-surface heat transfer correlations is examined. Experimentally determined wet-surface Nusselt number data are presented and compared with dry-surface data obtained from the same cooling coils. The wet-surface Nusselt numbers show considerable scatter; some of the results are higher than the corresponding dry-surface correlations, while others are lower. A sensitivity analysis is presented to illustrate that the wet-surface Nusselt numbers are very sensitive to the uncertainties in the measured inlet dew-point temperature and the measured heat transfer rate. It is demonstrated that the use of dry-surface Nusselt number correlations in a coil model result in wet-surface heat transfer predictions that are generally within 5 percent of the experimentally determined value.
Keywords:cooling coil  fin tube heat exchanger  condensation
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