Answered: a) What is the heat loss per meter of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A low carbon steel pipe with an internal diameter of 52.5 mm and a thickness of 3.8 mm that carries dry saturated steam at 20 bar is insulated with an insulator made of diatomaceous earth with a thickness of 30 mm and whose thermal conductivity is 0.1 W / (m ° C). This in turn is covered with a 65 mm thick layer of asbestos with k = 0.073 W / (m ° C). In one test the ambient temperature was 20 ° C and the asbestos surface temperature was 40 ° C. The heat transfer coefficient in the inner part of the tube was estimated as h_i = 55 W / (m2 ° C). Neglect radiation losses.

a) What is the heat loss per meter of pipe, in W / m?

1) 61

2) 84

3) 142

4) 575

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