A house has a composite wall of wood, fiberglass insulation, 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, Too,i= 20°C Glass fiber blanket (28 kg/m³), k 10 mm 100 mm- 4 Plywood siding, k Outside ho Too, o = -15°C -20 mm Lp Ls (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 rate of heat loss through the wall.

Elements Of Electromagnetics
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A house has a composite wall of wood, fiberglass insulation, 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, T∞o, i = 20°C
111
10 mm
Glass fiber blanket
(28 kg/m³), k
-100 mm-
Lb
Plywood siding, k
Outside
ho, T∞, o = -15°C
-20 mm
Lp
L₂
(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 rate of heat loss through the wall.
Transcribed Image Text:A house has a composite wall of wood, fiberglass insulation, 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, T∞o, i = 20°C 111 10 mm Glass fiber blanket (28 kg/m³), k -100 mm- Lb Plywood siding, k Outside ho, T∞, o = -15°C -20 mm Lp L₂ (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 rate of heat loss through the wall.
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