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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 ho  60 W/m2  K and hi  30 W/m2  K. The total wall surface area is 350 m2.  (a)Determine the total heat loss through the wall.          (b) If the wind were blowing violently, raising ho to 300 W/m2  K, determine the percentage increase in the heat loss.

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 ho  60 W/m2  K and hi  30 W/m2  K. The total wall surface area is 350 m2.  (a)Determine the total heat loss through the wall.          (b) If the wind were blowing violently, raising ho to 300 W/m2  K, determine the percentage increase in the heat loss.

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, as indicated in the sketch. On a cold winter day the convection heat transfer  coefficients are ho  60 W/m2  K and hi  30 W/m2  K. The total wall surface area is 350 m2. 

(a)Determine the total heat loss through the wall.       
 

(b) If the wind were blowing violently, raising ho to 300 W/m2  K, determine the percentage increase in the heat loss.

 

 

                                                                     

Glass fiber blanket (28 kg/m3), k, Plaster board, k,- Plywood siding, k, Inside Outside h, Ti= 20°C h, Tm o= -15°C 0o, 11 10 mm + -100 mm- 20 mm
Transcribed Image Text:Glass fiber blanket (28 kg/m3), k, Plaster board, k,- Plywood siding, k, Inside Outside h, Ti= 20°C h, Tm o= -15°C 0o, 11 10 mm + -100 mm- 20 mm
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