A composite insulating wall has a layer of red brick and another insulating brick held together by an aluminum rivet of 30mm diameter per 0.1m? of the surface. The red brick layer is 100 mm thick, with the hot surface at 225°C, and the insulating brick layer is 250 mm thick with the cold surface at 37°C. The thermal conductivities of the materials are: for the aluminum rivet = 203.6W/mK, for the red brick = 0.93W/mK and for the insulating brick %3D 0.116W/mK. Estimate the percentage increase in heat transfer rate due to rivets.

A composite insulating wall has a layer of red brick and another insulating brick held together by an aluminum rivet of 30mm diameter per 0.1m? of the surface. The red brick layer is 100 mm thick, with the hot surface at 225°C, and the insulating brick layer is 250 mm thick with the cold surface at 37°C. The thermal conductivities of the materials are: for the aluminum rivet = 203.6W/mK, for the red brick = 0.93W/mK and for the insulating brick %3D 0.116W/mK. Estimate the percentage increase in heat transfer rate due to rivets.

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

A composite insulating wall has a layer of red
brick and another insulating brick held together
by an aluminum rivet of 30mm diameter per
0.1m2 of the surface. The red brick layer is 100
mm thick, with the hot surface at 225°C, and
the insulating brick layer is 250 mm thick with
the cold surface at 370C. The thermal
conductivities of the materials are: for the
aluminum rivet = 203.6W/mK, for the red brick
= 0.93W/mK and for the insulating brick
%3D
%3D
0.116W/mK. Estimate the percentage increase
in heat transfer rate due to rivets.

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