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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

The Influence of the Fin Type and Base Tube Diameter of Serrated and Solid-Fin Tubes on the Heat Transfer and Pressure Drop Performance

Get access (open in a dialog) DOI: 10.1615/IHTC15.hte.008718
pages 4073-4084

要約

In heat recovery from turbine exhaust gases, finned tube bundles are frequently used. Especially in offshore applications compactness and light weight of components such as heat exchangers are important parameters. In order to optimize the size and weight of a turbine waste heat recovery unit an experimental investigation of the heat transfer and pressure drop performance of three finned tube bundles was carried out. Two tube bundles had an external tube diameter of 31.75 mm and were only varying in the fin type, having serrated and solid-fin tubes, respectively. The third bundle had an outer tube diameter of 19.05 mm and had serrated-fin tubes. All tube bundles had a fin height of 18 mm and 276 fins per meter tube length. The tube bundles were tested in a wind tunnel. They were arranged in a staggered, equilateral layout having eight tube rows in the direction of the flow. The results show that serrated-fin tubes experience higher side heat transfer coefficients but also higher pressure drop coefficients than to solid-fin tubes. Secondly, the serrated-fin tubes having a large tube diameter experienced higher heat transfer coefficients and higher Euler numbers than smaller diameter tubes. A comparison of the heat duty per unit pressure drop showed that serrated-fin tubes having small-diameter tubes lead to higher heat duty per unit pressure drop and therefore will provide more compact tube bundles.