An experimental study on the quantitative interpretation of local convective heat transfer for a plate fin and tube heat exchanger using the lumped capacitance method |
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| Affiliation: | 1. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China;2. Electrical & Instrument Department, Wuhuan Engineering Co., Ltd, Wuhan 430223, China;1. School of materials and metallurgical engineering, Iran University of science and technology (IUST), Narmak, Tehran, Iran;2. Materials and Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran;3. Department of Metallurgical and Materials Engineering, Faculty of Engineering, Ferdowsi university of Mashhad, Mashhad, Iran |
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| Abstract: | An experimental study has been performed to investigate the heat transfer characteristics of a plate fin and tube heat exchanger. Existing transient and steady methods are inappropriate for the measurement of heat transfer coefficients of the thin heat transfer model. In this study, the lumped capacitance method based on liquid crystal thermography was adopted. The method is validated through impinging jet and plate flow experiments. The two experiments showed very good agreements with those of the well-known transient method with the thick acryl model. And the lumped capacitance method showed similar results regardless of the thickness of the polycarbonate model if the Bi of the fin is small enough. The method was also applied for the heat transfer coefficient measurements of a fin and tube heat exchanger. Quantitative heat transfer coefficients of the plate fin were successfully obtained. |
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