Example:Saturated steam at 267°F is flowing inside a %-in steel pipe having an ID of 0.824 in. and an OD of1.050 in. The pipe is insulated with 1.5 in of insulation on the outside. The convective coefficient for theinside steam surface of the pipe is estimated as h; = 1000 Btu/hr-ft? °F, and the convective coefficient onthe outside of the lagging is estimated as ho = 2 Btu/hr-ft20°F. The mean thermal conductivity of the metalis 26 Btu/hr-ft °F and 0.037 Btu/hr-ft °F for the insulationa. Calculate for the heat loss for 1 ft of pipe using resistances if the surrounding air is at 80°Fb. Repeat using the overall U; based on the area AiGiven:To= 80°FTi = 267°FDipipe = 0.824 in →r; = 0.412 inDo,pipe = 1.050 in→r¸ = 0.525 inTins= 2.025"insulationr,-0.525"rins = 1.5 in + 0.525 in = 2.025 = ro%3Dh, = 1000 Btu/hr-ft2 °F-1.5"-r=D0.42T = 267 Fho = 2 Btu/hr-ft²°Fkm = 26 Btu/hr-ft °FKins = 0.037 Btu/hr-ft °F%3D%3D

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Answered: Example: Saturated steam at 267°F is…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.28P

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