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Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v11.i3.30
pages 217-230

Prediction of Moist Air Wet Processes in Cooling Coils and Cooling Towers

Jianfeng Wang
Institute of Environmental Studies, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Eiji Hihara
Institute of Environmental Studies, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

RÉSUMÉ

A general expression about effective mean temperature difference (MTD) is derived for a heat transfer process between two working fluids and is taken as a criterion to analyze the deviation of log mean temperature difference (LMTD) and log mean enthalpy difference (LMED) used for the calculation of heat and mass transfer processes of moist air in cooling coils and cooling towers. It is shown that LMTD and LMED are always less than the effective MTD and mean enthalpy difference (MED) for cooling coils, and LMED is always greater than the effective mean enthalpy difference (MED) for cooling towers at the HVAC design condition. For accurate performance prediction, the derived general expression is recommended in this article. In addition, for cooling and dehumidifying coils, the equivalent heat transfer temperature difference is suggested instead of LMED to calculate the overall heat transfer coefficient.


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