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4. The walls of house in cold region comprise three layers 15 cm outer brick work (k = 0.75 W/m-deg) 1.25 cm inner wooden paneling (k = 0.2 W/m-deg) 7.5 cm intermediate layer of insulating material The insulation layer is stated to offer resistance twice the thermal resistance of brick work. If the inside and outside temperatures of the composite wall are 20°C and -15 °C respectively, determine the rate of heat loss per unit area of the wall and the thermal conductivity of the insulating material.

4. The walls of house in cold region comprise three layers 15 cm outer brick work (k = 0.75 W/m-deg) 1.25 cm inner wooden paneling (k = 0.2 W/m-deg) 7.5 cm intermediate layer of insulating material The insulation layer is stated to offer resistance twice the thermal resistance of brick work. If the inside and outside temperatures of the composite wall are 20°C and -15 °C respectively, determine the rate of heat loss per unit area of the wall and the thermal conductivity of the insulating material.

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
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4. The walls of house in cold region comprise three layers 15 cm outer brick work (k = 0.75 W/m-deg) 1.25 cm inner wooden paneling (k = 0.2 W/m-deg) 7.5 cm intermediate layer of insulating material The insulation layer is stated to offer resistance twice the thermal resistance of brick work. If the inside and outside temperatures of the composite wall are 20°C and-15°C respectively, determine the rate of heat loss per unit area of the wall and the thermal conductivity of the insulating material.
Transcribed Image Text:4. The walls of house in cold region comprise three layers 15 cm outer brick work (k = 0.75 W/m-deg) 1.25 cm inner wooden paneling (k = 0.2 W/m-deg) 7.5 cm intermediate layer of insulating material The insulation layer is stated to offer resistance twice the thermal resistance of brick work. If the inside and outside temperatures of the composite wall are 20°C and-15°C respectively, determine the rate of heat loss per unit area of the wall and the thermal conductivity of the insulating material.
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