Q3/ A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in the sketch. On a cold winter day, Plaster board, , Glass fiber blanket (28 kgim), k -Plywood siding, , the convection heat transfer coefficients are h, = 60 W/m? K and h = 30 W/m² K. The total wall surface area is 350 m2. Inside Outside %3D A, T20°C A, T-15°C 111 11 Determine the total heat loss through the wall. If the wind were blowing violently, raising ho to 300 W/m2 K, determine the percentage increase in the heat loss. The themal conductivity of 10 mm- 100 mm 20 mm (kb = 0.038 W/m-K, ks = 0.12 W/m-K, kp = 0.17 W/m-K.) %3D
Q3/ A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in the sketch. On a cold winter day, Plaster board, , Glass fiber blanket (28 kgim), k -Plywood siding, , the convection heat transfer coefficients are h, = 60 W/m? K and h = 30 W/m² K. The total wall surface area is 350 m2. Inside Outside %3D A, T20°C A, T-15°C 111 11 Determine the total heat loss through the wall. If the wind were blowing violently, raising ho to 300 W/m2 K, determine the percentage increase in the heat loss. The themal conductivity of 10 mm- 100 mm 20 mm (kb = 0.038 W/m-K, ks = 0.12 W/m-K, kp = 0.17 W/m-K.) %3D
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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Transcribed Image Text:Q3/ A house has a composite wall of wood,
fiberglass insulation, and plaster board, as
indicated in the sketch. On a cold winter day, Plaster board, k
Glass fiber blanket
(28 kglm'), k
Plywood siding, k,
the convection heat transfer coefficients are
Inside
Outside
h, = 60 W/m? K and hi = 30 W/m² K.
The total wall surface area is 350 m2.
Determine the total heat loss through the wall.
If the wind were blowing violently, raising ho
to 300 W/m? K, determine the percentage
increase in the heat loss. The thermal conductivity of
A, T - 20°C
A, Ta =-15°C
11
11
10 mm 100 mm
4
-20 mm
(kb = 0.038 W/m-K, ks = 0.12 W/m-K, kp = 0.17 W/m-K.)
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