期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 85, 期 -, 页码 1049-1057出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2015.02.048
关键词
Natural draft; Cross-wind; Effectiveness; Tower characteristic ratio; Water flow rate; Wind velocity
资金
- King Mongkut's University of Technology Thonburi
- Research Chair Grant National Science and Technology Development Agency (NSTDA)
- Thailand Research Fund [IRG5780005]
- National Research University
The present work deals with an experimental investigation of the thermal performance of a natural draft wet-type cooling tower with counter flow arrangement. The authors perform a thorough analysis of the simultaneous heat and mass transfer phenomenon between air and water. The investigation mainly concentrates on the effect of crosswind on the thermal performance of the tower. Performance index parameters such as the temperature drop (T-drop), effectiveness (e), and the tower characteristic ratio (KaV/L) are presented in the paper. Variation of the performance parameters in terms of inlet water temperature, water flow rate, and wind velocity is studied in a crosswind-influenced environment. When comparing the crosswind-influenced experimental data with that of the windless condition, it is observed that Tdrop and e decrease by 4% and 4.5%, respectively, in a crosswind environment. However, this decreasing trend of T-drop and e is observed up to the critical Froude number, F-cr, followed by an increasing trend. Variation of the tower characteristic ratio in the crosswind environment for different values of inlet water temperature is also studied in detail. Two different regimes are found to exist as water and air flow within the tower. However, the capacity of cooling of higher water flow rates demonstrates that regime-II is more efficient than regime-I. Moreover, the correlative equations of different performance parameters are developed for both windless and crosswind conditions. Additionally, a correlation of tower characteristic ratio to different water-air mass flow rates is proposed. (C) 2015 Elsevier Ltd. All rights reserved.
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