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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

A METHOD TO ESTIMATE BUNDLE CONDENSATION HEAT TRANSFER ENHANCED WITH 3D FINS

Get access (open in a dialog) DOI: 10.1615/IHTC16.cod.022328
pages 2147-2153

Аннотация

An accurate estimation of the heat exchanger performance is of great importance to thermal design engineers. Shell and tube condensers, having a structure of a bundle of tubes housed in a shell, allow heat transfer from the condensing vapor on the shell side to the water that flows inside the tubes. Depending on their depth in a condenser bundle, tubes are subject to varying degrees of inundation by condensate formed on their own surface and drained from the tubes above them. The tubes located in the very top of the bundle are not or slightly inundated whereas the tubes in the middle of the bundle are more inundated; those in the bundle bottom are the most severely inundated. In this work, the heat transfer coefficient during R123 condensing on the enhanced outside surface of a single condenser tube was experimentally measured under various degrees of inundation in a single-tube condensation test facility, which simulates the varying degree of inundation over the tubes in a bundle at different depth. A mathematical model is developed to estimate the condensation heat transfer coefficient over a bundle outside surface based on the single tube measurements. It is found that the estimated condensation heat transfer agrees with the test results from a 500-ton lab chiller with the same lot of tubes. The method developed in this work provides a practical way to estimate the condensation heat transfer coefficient for refrigerant vapor condensing on the shell side of a condenser, which is of great interest to chiller designers and tube developers as well.