Insulation degrades (experiences an increase in thermal conductivity) if it is subjected to water vapor condensation. The problem may occur in home insulation during cold periods, when vapor in a humidified room diffuses through the drywall (plaster board) and condenses in the adjoining insulation. Estimate the mass diffusion rate for a 3 m × 4 m wall, under conditions for which the vapor pressure is 0.035 bar in the room air and 0.0 bar in the insulation. The drywall is 15 mm thick, and the solubility of water vapor in the wall material is approximately 5 × 10−3 kmol/m3 ⋅ bar. The binary diffusion coefficient for water vapor in the drywall is approximately 10−9 m2/s.
Insulation degrades (experiences an increase in thermal conductivity) if it is subjected to water vapor condensation. The problem may occur in home insulation during cold periods, when vapor in a humidified room diffuses through the drywall (plaster board) and condenses in the adjoining insulation. Estimate the mass diffusion rate for a 3 m × 4 m wall, under conditions for which the vapor pressure is 0.035 bar in the room air and 0.0 bar in the insulation. The drywall is 15 mm thick, and the solubility of water vapor in the wall material is approximately 5 × 10−3 kmol/m3 ⋅ bar. The binary diffusion coefficient for water vapor in the drywall is approximately 10−9 m2/s.
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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Question
Insulation degrades (experiences an increase in thermal
conductivity) if it is subjected to water vapor condensation.
The problem may occur in home insulation
during cold periods, when vapor in a humidified room
diffuses through the drywall (plaster board) and condenses
in the adjoining insulation. Estimate the mass
diffusion rate for a 3 m × 4 m wall, under conditions
for which the vapor pressure is 0.035 bar in the room
air and 0.0 bar in the insulation. The drywall is 15 mm
thick, and the solubility of water vapor in the wall
material is approximately 5 × 10−3 kmol/m3 ⋅ bar. The
binary diffusion coefficient for water vapor in the drywall
is approximately 10−9 m2/s.
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