A house wall consists of in. drywall, 31 in. glass fiber insulation, and an outside brick wall, 4-in, thick. Assume that there is perfect contact between each layer. The thermal conductivities of drywall, glass fiber, and brick are 0.17, 0.036, and 0.72 W mK, respectively. The inside temperature of the house is 70°F; the outside air temperature (no wind present) is 0F. (a) Find the heat flux in Btu fth. (b) Find the temperature (K) at the junction between the drywall and the glass fiber insulation. (c) Find the location (in inches from the inside surface of the drywall) where moisture freezes.

Introduction to Chemical Engineering Thermodynamics
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ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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2.12 A house wall consists of ! in. drywall, 31 in. glass fiber insulation, and an outside
brick wall, 4-in. thick. Assume that there is perfect contact between each layer.
The thermal conductivities of drywall, glass fiber, and brick are 0.17, 0.036, and
0.72 W m-K, respectively. The inside temperature of the house is 70°F; the
outside air temperature (no wind present) is O°F.
(a) Find the heat flux in Btu fth.
(b) Find the temperature (K) at the junction between the drywall and the glass
fiber insulation.
(c) Find the location (in inches from the inside surface of the drywall) where
moisture freezes.
Transcribed Image Text:2.12 A house wall consists of ! in. drywall, 31 in. glass fiber insulation, and an outside brick wall, 4-in. thick. Assume that there is perfect contact between each layer. The thermal conductivities of drywall, glass fiber, and brick are 0.17, 0.036, and 0.72 W m-K, respectively. The inside temperature of the house is 70°F; the outside air temperature (no wind present) is O°F. (a) Find the heat flux in Btu fth. (b) Find the temperature (K) at the junction between the drywall and the glass fiber insulation. (c) Find the location (in inches from the inside surface of the drywall) where moisture freezes.
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