Heat transfer characteristics of a new helically coiled crimped spiral finned tube heat exchanger

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Author listSrisawad K., Wongwises S.

PublisherSpringer

Publication year2009

JournalHeat and Mass Transfer (0947-7411)

Volume number45

Issue number4

Start page381

End page391

Number of pages11

ISSN0947-7411

eISSN1432-1181

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-67649135187&doi=10.1007%2fs00231-008-0441-1&partnerID=40&md5=6dde73639b7b91caf52a85907053f8bf

LanguagesEnglish-Great Britain (EN-GB)


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Abstract

In the present study, the heat transfer characteristics in dry surface conditions of a new type of heat exchanger, namely a helically coiled finned tube heat exchanger, is experimentally investigated. The test section, which is a helically coiled fined tube heat exchanger, consists of a shell and a helical coil unit. The helical coil unit consists of four concentric helically coiled tubes of different diameters. Each tube is constructed by bending straight copper tube into a helical coil. Aluminium crimped spiral fins with thickness of 0.5 mm and outer diameter of 28.25 mm are placed around the tube. The edge of fin at the inner diameter is corrugated. Ambient air is used as a working fluid in the shell side while hot water is used for the tube-side. The test runs are done at air mass flow rates ranging between 0.04 and 0.13 kg/s. The water mass flow rates are between 0.2 and 0.4 kg/s. The water temperatures are between 40 and 50ฐC. The effects of the inlet conditions of both working fluids flowing through the heat exchanger on the heat transfer coefficients are discussed. The air-side heat transfer coefficient presented in term of the Colburn J factor is proportional to inlet-water temperature and water mass flow rate. The heat exchanger effectiveness tends to increase with increasing water mass flow rate and also slightly increases with increasing inlet water temperature. ฉ 2008 Springer-Verlag.


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Last updated on 2023-14-10 at 07:35