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 . ft?.°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 . ft?.°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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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

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.

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