A double-pipe heat exchanger is constructed of a copper (k = 380 W/m K) inner tube
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A double-pipe heat exchanger is constructed of a copper (k = 380 W/m · K) inner tube of internal diameter Di = 1.2 cm and external diameter Do = 1.6 cm and an outer tube of diameter 3.0 cm. The convection heat transfer coefficient is reported to be hi = 700 W/m2 · K on the inner surface of the tube and ho = 1400 W/m2 · K on its outer surface. For a fouling factor Rf, i = 0.0005 m2 · K/W on the tube side and Rf, o = 0.0002 m2 · K/W on the shell side, determine
(a) The thermal resistance of the heat exchanger per unit length
(b) The overall heat transfer coefficients Ui and Uo based on the inner and outer surface areas of the tube, respectively.
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Related Book For
Heat And Mass Transfer Fundamentals And Applications
ISBN: 9780073398181
5th Edition
Authors: Yunus Cengel, Afshin Ghajar
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