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A masonry brick wall (k = 0.60 W/(m K) and a = 5 x 10-7 m²/s) of 150 mm thickness and originally at 30°C is suddenly exposed on one side to hot gases at 780°C. The other side of the wall is already insulated. The convection heat transfer coefficient on the hot gas side is 20 W/(m2 K). Determine, by making use of Heisler charts, (a) the time required for the insulated surface to attain a temperature of 480°C and (b) the heat transferred to the wall per unit area during that time

A masonry brick wall (k = 0.60 W/(m K) and a = 5 x 10-7 m²/s) of 150 mm thickness and originally at 30°C is suddenly exposed on one side to hot gases at 780°C. The other side of the wall is already insulated. The convection heat transfer coefficient on the hot gas side is 20 W/(m2 K). Determine, by making use of Heisler charts, (a) the time required for the insulated surface to attain a temperature of 480°C and (b) the heat transferred to the wall per unit area during that time

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
Problem 1.1MA
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A masonry brick wall (k = 0.60 W/(m K) and a = 5 x 10-7 m²/s) of 150 mm thickness and originally at 30°C is suddenly exposed on one side to hot gases at 780°C. The other side of the wall is already insulated. The convection heat transfer coefficient on the hot gas side is 20 W/(m? K). Determine, by making use of Heisler charts, (a) the time required for the insulated surface to attain a temperature of 480°C and (b) the heat transferred to the wall per unit area during that time.
Transcribed Image Text:A masonry brick wall (k = 0.60 W/(m K) and a = 5 x 10-7 m²/s) of 150 mm thickness and originally at 30°C is suddenly exposed on one side to hot gases at 780°C. The other side of the wall is already insulated. The convection heat transfer coefficient on the hot gas side is 20 W/(m? K). Determine, by making use of Heisler charts, (a) the time required for the insulated surface to attain a temperature of 480°C and (b) the heat transferred to the wall per unit area during that time.
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