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Consider a conduction in a plane composite wall as shown. The outer hotter air temperature at 60 C whose convective heat transfer coefficient of 1000 W/m² K while the colder side at 24 C with heat transfer coefficient of 750 W/m² K. There is 5 C drop of temperature between air and wall surface at both hotter and colder side. The temperatures at the interfaces are 45 C and 40 C. Find the thermal conductivity of wall B. Hot air Cold air A B LA -2LB KA = 25 W/m.K Kc = 50 W/m.K 4k LA = 30 mm LB = 30 mm Lc = 20 mm

Consider a conduction in a plane composite wall as shown. The outer hotter air temperature at 60 C whose convective heat transfer coefficient of 1000 W/m² K while the colder side at 24 C with heat transfer coefficient of 750 W/m² K. There is 5 C drop of temperature between air and wall surface at both hotter and colder side. The temperatures at the interfaces are 45 C and 40 C. Find the thermal conductivity of wall B. Hot air Cold air A B LA -2LB KA = 25 W/m.K Kc = 50 W/m.K 4k LA = 30 mm LB = 30 mm Lc = 20 mm

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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Consider a conduction in a plane composite wall as shown. The outer hotter air temperature at 60 C whose convective heat transfer coefficient of 1000 W/m² K while the colder side at 24 C with heat transfer coefficient of 750 W/m² K. There is 5 C drop of temperature between air and wall surface at both hotter and colder side. The temperatures at the interfaces are 45 C and 40 C. Find the thermal conductivity of wall B. Hot air Cold air A B C -LA- -2LB 4k KA = 25 W/m.K kc = 50 W/m-K LA = 30 mm LB = 30 mm Lc = 20 mm
Transcribed Image Text:Consider a conduction in a plane composite wall as shown. The outer hotter air temperature at 60 C whose convective heat transfer coefficient of 1000 W/m² K while the colder side at 24 C with heat transfer coefficient of 750 W/m² K. There is 5 C drop of temperature between air and wall surface at both hotter and colder side. The temperatures at the interfaces are 45 C and 40 C. Find the thermal conductivity of wall B. Hot air Cold air A B C -LA- -2LB 4k KA = 25 W/m.K kc = 50 W/m-K LA = 30 mm LB = 30 mm Lc = 20 mm
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