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1. Composite Brick Wall A 3.0 in thick brick wall has an outside surface temperature of 15 o F at a certain time in severe winter weather. The inside 0.5 in thick wallboard, which is separated from the brick wall by a 6-in air gap, has an inside surface temperature of 78 o F. Determine (a) the R-value Rv of the wall and (b) the heat rate q'' in [Btu/h·ft 2 ] through this wall. Assume that the air between the brick and wallboard surfaces does not circulate.

1. Composite Brick Wall A 3.0 in thick brick wall has an outside surface temperature of 15 o F at a certain time in severe winter weather. The inside 0.5 in thick wallboard, which is separated from the brick wall by a 6-in air gap, has an inside surface temperature of 78 o F. Determine (a) the R-value Rv of the wall and (b) the heat rate q'' in [Btu/h·ft 2 ] through this wall. Assume that the air between the brick and wallboard surfaces does not circulate.

Elements Of Electromagnetics
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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1. Composite Brick Wall

A 3.0 in thick brick wall has an outside surface temperature of 15 o F at a certain time in

severe winter weather. The inside 0.5 in thick wallboard, which is separated from the

brick wall by a 6-in air gap, has an inside surface temperature of 78 o F. Determine (a) the

R-value Rv of the wall and (b) the heat rate q'' in [Btu/h·ft 2 ] through this wall. Assume

that the air between the brick and wallboard surfaces does not circulate.

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