A wall is constructed of two layers of 0.5-in-thick sheetrock (k = 0.10 Btu/h·ft·o F), which is a plasterboard made of two layers of heavy paper separated by a layer of gypsum, placed 7 in apart. The space between the sheetrocks is filled with fibreglass insulation (k = 0.020 Btu/h·ft·o F). Determine a) the thermal resistance of the wall, and b) its R-value of insulation in English units.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A wall is constructed of two layers of 0.5-in-thick sheetrock (k = 0.10 Btu/h·ft·o
F),
which is a plasterboard made of two layers of heavy paper separated by a layer of
gypsum, placed 7 in apart. The space between the sheetrocks is filled with fibreglass
insulation (k = 0.020 Btu/h·ft·o
F). Determine a) the thermal resistance of the wall, and
b) its R-value of insulation in English units.  

Fiberglass
insulation
Sheetrock
0.7 in -
7 in
0.7 in
FIGURE P17-29E
Transcribed Image Text:Fiberglass insulation Sheetrock 0.7 in - 7 in 0.7 in FIGURE P17-29E
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