A 10-in-thick, 30-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k = 0.40 Btu/ h·ft·°F) of cross section 7 in * 7 in, or identical size bricks with nine square air holes (k = 0.015 Btu/h·ft·°F) that are 9 in long and have a cross section of 1.5 in * 1.5 in. There is a 0.5-in-thick plaster layer (k = 0.10 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 30°F. Taking the heat transfer coefficients at the inner and outer surfaces of the wall to be 1.5 and 4 Btu/h·ft2·°F, respectively, determine the rate of heat transfer through the wall constructed of (a) solid bricks and (b) bricks with air holes.
A 10-in-thick, 30-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k = 0.40 Btu/ h·ft·°F) of cross section 7 in * 7 in, or identical size bricks with nine square air holes (k = 0.015 Btu/h·ft·°F) that are 9 in long and have a cross section of 1.5 in * 1.5 in. There is a 0.5-in-thick plaster layer (k = 0.10 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 30°F. Taking the heat transfer coefficients at the inner and outer surfaces of the wall to be 1.5 and 4 Btu/h·ft2·°F, respectively, determine the rate of heat transfer through the wall constructed of (a) solid bricks and (b) bricks with air holes.
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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Question
A 10-in-thick, 30-ft-long, and 10-ft-high wall is to
be constructed using 9-in-long solid bricks (k = 0.40 Btu/
h·ft·°F) of cross section 7 in * 7 in, or identical size bricks
with nine square air holes (k = 0.015 Btu/h·ft·°F) that are 9
in long and have a cross section of 1.5 in * 1.5 in. There
is a 0.5-in-thick plaster layer (k = 0.10 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 30°F. Taking the heat transfer coefficients
at the inner and outer surfaces of the wall to be 1.5 and 4
Btu/h·ft2·°F, respectively, determine the rate of heat transfer
through the wall constructed of (a) solid bricks and (b) bricks
with air holes.
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