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3.13 A house has a composite wall of wood, fiberglass insula- tion, and plaster board, as indicated in the sketch. On a cold winter day, the convection heat transfer coefficients are h = 60 W/m². K and h₁ = 30 W/m².K. The total wall surface area is 350 m². Plaster board, kp Inside h₁, Tooi = 20°C ^^^ Glass fiber blanket (28 kg/m³), k 10 mm 100 mm- Lb L₂ ← -Plywood siding, k Outside please include assumptions and drawing ho Too-15°C 111 -20 mm (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. (c) If the wind were blowing violently, raising h, to 300 W/m².K, determine the percentage increase in the heat loss. (d) What is the controlling resistance that determines the amount of heat flow through the wall?

3.13 A house has a composite wall of wood, fiberglass insula- tion, and plaster board, as indicated in the sketch. On a cold winter day, the convection heat transfer coefficients are h = 60 W/m². K and h₁ = 30 W/m².K. The total wall surface area is 350 m². Plaster board, kp Inside h₁, Tooi = 20°C ^^^ Glass fiber blanket (28 kg/m³), k 10 mm 100 mm- Lb L₂ ← -Plywood siding, k Outside please include assumptions and drawing ho Too-15°C 111 -20 mm (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. (c) If the wind were blowing violently, raising h, to 300 W/m².K, determine the percentage increase in the heat loss. (d) What is the controlling resistance that determines the amount of heat flow 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
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3.13 A house has a composite wall of wood, fiberglass insula- tion, and plaster board, as indicated in the sketch. On a cold winter day, the convection heat transfer coefficients are h = 60 W/m². K and h; = 30 W/m².K. The total wall surface area is 350 m². Plaster board, k Inside hi, Tooi = 20°C Glass fiber blanket (28 kg/m³), k 10 mm 100 mm- L L₂ -Plywood siding, k Outside please include assumptions and drawing ho, T∞, o = -15°C 111 20 mm Lp (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. (c) If the wind were blowing violently, raising h, to 300 W/m².K, determine the percentage increase in the heat loss. (d) What is the controlling resistance that determines the amount of heat flow through the wall?
Transcribed Image Text:3.13 A house has a composite wall of wood, fiberglass insula- tion, and plaster board, as indicated in the sketch. On a cold winter day, the convection heat transfer coefficients are h = 60 W/m². K and h; = 30 W/m².K. The total wall surface area is 350 m². Plaster board, k Inside hi, Tooi = 20°C Glass fiber blanket (28 kg/m³), k 10 mm 100 mm- L L₂ -Plywood siding, k Outside please include assumptions and drawing ho, T∞, o = -15°C 111 20 mm Lp (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. (c) If the wind were blowing violently, raising h, to 300 W/m².K, determine the percentage increase in the heat loss. (d) What is the controlling resistance that determines the amount of heat flow through the wall?
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