Question
100%
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?
expand button
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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