A study on the thermal contact conductance in fin–tube heat exchangers with 7 mm tube |
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| Affiliation: | 1. Department of Mechanical Engineering, Graduate School of KyungHee University, 1 Seochon, Kihung, Yongin, Kyunggi 449-701, Republic of Korea;2. College of Advanced Technology, KyungHee University, 1 Seochon, Kihung, Yongin, Kyunggi 449-701, Republic of Korea;3. System Appliances Division, Samsung Electronics Co., Ltd, 416 Maetan-3Dong, Yeongtong, Suwon, Kyunggi 443-742, Republic of Korea;1. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India;2. Reactor Engineering Division, Bhabha Atomic Research Center, Trombay, Mumbai 400 085, India;3. Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai 400 019, India;1. Faculty of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran;2. Young Researchers and Elites Club, North Tehran Branch, Islamic Azad University, Tehran, Iran;1. Department of Mechanical Engineering, Indus University, Gujarat, India;2. School of Technology, Pandit Deendayal Petroleum University, Gujarat, India;3. Department of Mechanical Engineering, Marwadi Education Foundation Groups of Institutes, Gujarat, India;1. School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China;2. College of Energy and Power Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China |
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| Abstract: | The thermal contact resistance has been frequently neglected in the process of design of heat exchangers because of the difficulty of measurement and the lack of accurate data. However, the thermal contact resistance is one of principal parameters in heat transfer mechanism of fin–tube heat exchangers. The objective of the present study is to investigate new factors such as fin types and manufacturing types of the tube affecting the thermal contact conductance and to find a correlation between the thermal contact conductance and the effective factors in fin–tube heat exchangers with 7 mm tube. The thermal contact conductances in the 22 heat exchangers with 7 mm tube have been investigated through the experimental–numerical method. A numerical scheme has been employed to calculate the thermal contact conductance and the portion of thermal resistances using the experimental data. As a result, the thermal contact conductance has been evaluated quantitatively, and a new correlation including the influence of new factors such as fin types and manufacturing types of the tube has been developed in the fin–tube heat exchanger with 7 mm tube. Also, the portion of each thermal resistance has been evaluated in each case. |
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