A 10-in-thick, 40-ft-long, and 20-ft-high wall is to be constructed using 9-in-long solid bricks (k = 0.50 Btu/h·ft"F) of cross section 7 in x 7 in, or identical size bricks with nine square air holes (k = 0.02 Btu/h-ft°F) that are 9 in long and have a cross section of 1.5 in x 1.5 in. There is a 0.5-in-thick plaster layer (k = 0.15 Btu/h-ft-"F) between two adjacent bricks on all four sides and on both sides of the wall. The house is maintained at 80°F and the ambient temperature outside is 35°F. Taking the heat transfer coefficients at the inner and outer surfaces of the wall to be 2.0 and 4.0 Btu/h-ft. "F, respectively, determine the rate of heat loss transferred through the wall constructed of (a) solid bricks and, (b) bricks with air holes. Air channels 1.5 in x 1.5 in x 9 in 0.5 in 7 in 0.5 in Plaster Brick 0.5 in 0.5 in 9 in-

A 10-in-thick, 40-ft-long, and 20-ft-high wall is to be constructed using 9-in-long solid bricks (k = 0.50 Btu/h·ft"F) of cross section 7 in x 7 in, or identical size bricks with nine square air holes (k = 0.02 Btu/h-ft°F) that are 9 in long and have a cross section of 1.5 in x 1.5 in. There is a 0.5-in-thick plaster layer (k = 0.15 Btu/h-ft-"F) between two adjacent bricks on all four sides and on both sides of the wall. The house is maintained at 80°F and the ambient temperature outside is 35°F. Taking the heat transfer coefficients at the inner and outer surfaces of the wall to be 2.0 and 4.0 Btu/h-ft. "F, respectively, determine the rate of heat loss transferred through the wall constructed of (a) solid bricks and, (b) bricks with air holes. Air channels 1.5 in x 1.5 in x 9 in 0.5 in 7 in 0.5 in Plaster Brick 0.5 in 0.5 in 9 in-

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 10-in-thick, 40-ft-long, and 20-ft-high wall is to be constructed using 9-in-long solid
bricks (k = 0.50 Btu/h·ft-°F) of cross section 7 in x 7 in, or identical size bricks with nine
square air holes (k = 0.02 Btu/h-ft-°F) that are 9 in long and have a cross section of 1.5 in
x 1.5 in. There is a 0.5-in-thick plaster layer (k = 0.15 Btu/h-ft-°F) between two adjacent
bricks on all four sides and on both sides of the wall. The house is maintained at 80°F and
the ambient temperature outside is 35°F. Taking the heat transfer coefficients at the inner
and outer surfaces of the wall to be 2.0 and 4.0 Btu/h-ft². °F, respectively, determine the
rate of heat loss transferred through the wall constructed of (a) solid bricks and, (b) bricks
with air holes.
Air channels
1.5 in x 1.5 in x 9 in
0.5 in
7 in
0.5 in
Plaster
Brick
0.5 in-9 in→
0.5 in

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