The tube in a heat exchanger has a 2-in inner diameter and a 3-in outer diameter. The thermal conductivity of the tube material is 0.5 Btu/h·ft·°F, while the inner surface heat transfer coefficient is 50 Btu/h·ft2·°F and the outer surface heat transfer coefficient is 10 Btu/h·ft2·°F. Determine the overall heat transfer coefficients based on the outer and inner surfaces.

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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Chapter28: Current And Resistance
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The tube in a heat exchanger has a 2-in inner
diameter and a 3-in outer diameter. The thermal conductivity
of the tube material is 0.5 Btu/h·ft·°F, while the inner surface
heat transfer coefficient is 50 Btu/h·ft2·°F and the outer surface
heat transfer coefficient is 10 Btu/h·ft2·°F. Determine the
overall heat transfer coefficients based on the outer and inner
surfaces.

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