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A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coefficients are ho- 60 W/m².K and h-30 W/m.K. The total wall surface area is 350 m. If Kp 0.17 W/m.K, Kb 0.036 W/m.K, and K, 0.12 W/m.K.

A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coefficients are ho- 60 W/m².K and h-30 W/m.K. The total wall surface area is 350 m. If Kp 0.17 W/m.K, Kb 0.036 W/m.K, and K, 0.12 W/m.K.

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 plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coefficients are ho 60 W/m.K and h- 30 W/m².K. The total wall surface area is 350 m . If Kp= 0.17 W/m.K, K = 0.036 W/m.K, and K: = 0.12 W/m.K. Glass fiber blanket (28 kg/m), k, Plaster board, k, - Plywood siding, k, Inside Outside h, T= 20°C h. T=-15°C 11 11 10 mm -100 mm 20 mm A. What are the main assumptions? B.Draw the thermal circuit representing conduction through the composite wall ? C.Drive an expression in symbol form for the total thermal resistance of the composite wall, including inside and outside convection effects for the prescribed conditions.
Transcribed Image Text:A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in Fig. On a cold winter day the convection heat transfer coefficients are ho 60 W/m.K and h- 30 W/m².K. The total wall surface area is 350 m . If Kp= 0.17 W/m.K, K = 0.036 W/m.K, and K: = 0.12 W/m.K. Glass fiber blanket (28 kg/m), k, Plaster board, k, - Plywood siding, k, Inside Outside h, T= 20°C h. T=-15°C 11 11 10 mm -100 mm 20 mm A. What are the main assumptions? B.Draw the thermal circuit representing conduction through the composite wall ? C.Drive an expression in symbol form for the total thermal resistance of the composite wall, including inside and outside convection effects for the prescribed conditions.
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