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/m².K. The total wall surface area is 350 m2. 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, Ti = 20°C h, T = -15°c 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. D.Determine the total heat rate through the wall. E. What is the controlling resistance that determines the heat rate through the wall?

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/m².K. The total wall surface area is 350 m2. 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, Ti = 20°C h, T = -15°c 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. D.Determine the total heat rate through the wall. E. What is the controlling resistance that determines the heat rate through the wall?

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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10.The layout of a wall and the heat transfer parameters are shown in the figure below. Find the internal temperature of the wall, T₁. (o= 5.67 x 10-8 W/m²K4 ) (Ans: 569.5K) T1 k=1.1 W/m.K Icond L=0.12m T2=373K x=0.7 grad Iconv Tsur Air Tex = 300K h = = 290K : 18 W/m².K