1. A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in figure. On a cold win

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1 A House Has A Composite Wall Of Wood Fiberglass Insulation And Plaster Board As Indicated In Figure On A Cold Win 1 (78.07 KiB) Viewed 31 times

1. A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in figure. 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. (a) Determine an expression in symbol form for the total thermal resistance of the wall, including inside and outside convection effects for the prescribed conditions. (b) Determine the total heat rate through the wall. (c) If the wind were blowing violently, raising ho to 300 W/m².K determine the percentage increase in the heat rate. (d) What is the controlling resistance that determines the heat rate through the wall? Plaster board, k Inside h₂, T = 20°C 111 10 mm Glass fiber blanket (28 kg/m³), k 4p -100 mm- 4₂ L₂ -Plywood siding, k, Outside ho T-15°C 111 -20 mm