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A house has a composite wall of wood, fiberglass insulation and plaster board. On a cold winter day, the convection heat transfer coefficients are ho = 60 W/m²/K and hi = 30 W/m²/K. Total wall surface is 350 m². Thermal conductivity: fiberglass k, = 0.038 W/m/K; wood k 0.12 W/m/K; plaster board kp = 0.17 W/m/K. = (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. (b) Determine the total heat loss through the wall.

A house has a composite wall of wood, fiberglass insulation and plaster board. On a cold winter day, the convection heat transfer coefficients are ho = 60 W/m²/K and hi = 30 W/m²/K. Total wall surface is 350 m². Thermal conductivity: fiberglass k, = 0.038 W/m/K; wood k 0.12 W/m/K; plaster board kp = 0.17 W/m/K. = (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. (b) Determine the total heat loss through the wall.

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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A house has a composite wall of wood, fiberglass insulation and plaster board. On a cold winter day, the convection heat transfer coefficients are ho 60 W/m²/K and h₁ = 30 W/m²/K. Total wall surface is 350 m². Thermal conductivity: fiberglass kħ = 0.038 W/m/K; wood ks 0.12 W/m/K; plaster board kp = 0.17 W/m/K. = (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. (b) Determine the total heat loss through the wall. Plaster board, k Inside h₁, T∞o, i = 20°C 111 Glass fiber blanket (28 kg/m³), kb 10 mm 100 mm Lb Lp Ls = Plywood siding, k Outside ho Too, o = -15°C ↑↑↑ 20 mm
Transcribed Image Text:A house has a composite wall of wood, fiberglass insulation and plaster board. On a cold winter day, the convection heat transfer coefficients are ho 60 W/m²/K and h₁ = 30 W/m²/K. Total wall surface is 350 m². Thermal conductivity: fiberglass kħ = 0.038 W/m/K; wood ks 0.12 W/m/K; plaster board kp = 0.17 W/m/K. = (a) Determine a symbolic expression for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. (b) Determine the total heat loss through the wall. Plaster board, k Inside h₁, T∞o, i = 20°C 111 Glass fiber blanket (28 kg/m³), kb 10 mm 100 mm Lb Lp Ls = Plywood siding, k Outside ho Too, o = -15°C ↑↑↑ 20 mm
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