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Contact resistance in air-cooled plate fin-tube air-conditioning condensers



Test equipment and procedures have been developed to measure the heat transfer performance of an industry-standard wavy plate fin-tube condenser, and to compare it with alternative designs, Two test rigs were employed:one used direct electric heating, and the other used an R22 thermosyphon. Analysis revealed that the standard production heat exchanger suffered from excessive fin-tube resistance. This was confirmed by sectioning and microscopic examination. Seven different designs were compared at the same Reynolds number. The results were analysed to isolate the air-side heat transfer coefficient. Copyright (C) 1996 Elsevier Science Ltd and II

Topics: QC, TJ
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