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The 2.44-m high exterior wall of a backwoods shack is constructed of 16-mm-thick cedar boards that form the outside surface of the shack's wall, 38-mm by 90-mm pine studs on 406-mm centers with glass-fiber insulation batts between the studs, and a 10- mm-thick inside wall made of plywood. The exterior wall construction includes a sole plate that uses 38×90 pine studs, and a top plate that uses two 38×90 pine studs. The outer surface of the exterior wall is exposed to air having a convection coefficient of hout= 35 W/m².K, and the inner surface of the wall is exposed to air having a convection coefficient of h = 8 W/m².K. Assume kedar = 0.11 W/m-K for cedar boards, = 0.14 W/m K for pine, kalts = 0.038 W/m K for glass-fiber insulation batts, and k pine

The 2.44-m high exterior wall of a backwoods shack is constructed of 16-mm-thick cedar boards that form the outside surface of the shack's wall, 38-mm by 90-mm pine studs on 406-mm centers with glass-fiber insulation batts between the studs, and a 10- mm-thick inside wall made of plywood. The exterior wall construction includes a sole plate that uses 38×90 pine studs, and a top plate that uses two 38×90 pine studs. The outer surface of the exterior wall is exposed to air having a convection coefficient of hout= 35 W/m².K, and the inner surface of the wall is exposed to air having a convection coefficient of h = 8 W/m².K. Assume kedar = 0.11 W/m-K for cedar boards, = 0.14 W/m K for pine, kalts = 0.038 W/m K for glass-fiber insulation batts, and k pine

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
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The 2.44-m high exterior wall of a backwoods shack is constructed of 16-mm-thick cedar boards that form the outside surface of the shack's wall, 38-mm by 90-mm pine studs on 406-mm centers with glass-fiber insulation batts between the studs, and a 10- mm-thick inside wall made of plywood. The exterior wall construction includes a sole plate that uses 38x90 pine studs, and a top plate that uses two 38x90 pine studs. The outer surface of the exterior wall is exposed to air having a convection coefficient of hout = 35 W/m².K, and the inner surface of the wall is exposed to air having a convection coefficient of hin = 8 W/m².K. Assume kedar = 0.11 W/m K for cedar boards, k = 0.14 W/m K for pine, katts = 0.038 W/m K for glass-fiber insulation batts, and k = 0.12 W/m K for plywood. pine plywood a) Find the heat transfer coefficient U for each section of the exterior wall. Answers: U₁ = 0.3635 W/m² K for sections with glass-fiber insulation batts and U₂ = 0.9754 W/m² K for sections with pine studs 2 b) Find the overall heat transfer coefficient for this type of exterior wall construction. Answer: U = 0.4467 W/m².K
Transcribed Image Text:The 2.44-m high exterior wall of a backwoods shack is constructed of 16-mm-thick cedar boards that form the outside surface of the shack's wall, 38-mm by 90-mm pine studs on 406-mm centers with glass-fiber insulation batts between the studs, and a 10- mm-thick inside wall made of plywood. The exterior wall construction includes a sole plate that uses 38x90 pine studs, and a top plate that uses two 38x90 pine studs. The outer surface of the exterior wall is exposed to air having a convection coefficient of hout = 35 W/m².K, and the inner surface of the wall is exposed to air having a convection coefficient of hin = 8 W/m².K. Assume kedar = 0.11 W/m K for cedar boards, k = 0.14 W/m K for pine, katts = 0.038 W/m K for glass-fiber insulation batts, and k = 0.12 W/m K for plywood. pine plywood a) Find the heat transfer coefficient U for each section of the exterior wall. Answers: U₁ = 0.3635 W/m² K for sections with glass-fiber insulation batts and U₂ = 0.9754 W/m² K for sections with pine studs 2 b) Find the overall heat transfer coefficient for this type of exterior wall construction. Answer: U = 0.4467 W/m².K
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