1. A high temperature steam line is covered with two successive layers of insulation. The layer in contact with the pipe is 1 ½ in. thickness of asbestos for which k is 0.08 Btu/hr .ft.°F. The asbestos is covered with a 1-in thickness if magnesia insulation, which has a value of 0.04. The internal pipe diameter is 2.90 in., the pipe wall thickness is 0.30 in. and k for the pipe is 26 Btu/hr.ft.°F. The steam temperature is 800°F, and the internal surface film coefficient is 40 Btu/hr . ft².°F , while the ambient outer temperature is 100 °F and the outer surface film coefficient is 1.2. Calculate (a) the value of U based upon the external area of magnesia covering, (b) the heat loss from the steam for a length of 180 feet of pipe, Btu/hr.

1. A high temperature steam line is covered with two successive layers of insulation. The layer in contact with the pipe is 1 ½ in. thickness of asbestos for which k is 0.08 Btu/hr .ft.°F. The asbestos is covered with a 1-in thickness if magnesia insulation, which has a value of 0.04. The internal pipe diameter is 2.90 in., the pipe wall thickness is 0.30 in. and k for the pipe is 26 Btu/hr.ft.°F. The steam temperature is 800°F, and the internal surface film coefficient is 40 Btu/hr . ft².°F , while the ambient outer temperature is 100 °F and the outer surface film coefficient is 1.2. Calculate (a) the value of U based upon the external area of magnesia covering, (b) the heat loss from the steam for a length of 180 feet of pipe, Btu/hr.

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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