Correlations for wet surface ratio of fin-and-tube heat exchangers |
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| Authors: | Worachest Pirompugd Chi-Chuan Wang Somchai Wongwises |
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| Affiliation: | 1. Department of Mechanical Engineering, Faculty of Engineering, Burapha University, Saensook, Muang, Chonburi 20131, Thailand;2. Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, ROC;3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;1. Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, Wuhan 430072, China;2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China |
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| Abstract: | Correlations are proposed for the wet surface ratio of a fin-and-tube heat exchanger with plain and wavy fin geometry under dehumidifying conditions. The ‘Finite Circular Fin Method’ (FCFM) is used for data reduction. It is found that the percentage of wet surface area increases with increasing fin spacing or number of tube rows and decreasing Reynolds number. Despite the addition of tube rows or reduced fin spacing the effective surface area is increased, and its influence on a partially wet surface is apparently the opposite. This is because adding tube rows will provide a more effective temperature drop in air flow than adding fins, Moreover, the heat and mass transfer characteristics of jh and jm increase with an increase in the area of wet surface. Correlations for prediction of the percentage of wet surface area are proposed. These correlations can describe 83.81% of the area of wet surface to within ±10%. |
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