Answered: Consider a conduction in a plane…

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 / m^2 K while the colder side at 24 C with heat transfer coefficient of 750 W / m^2 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
A
LA
KA = 25 W/m-K
kc = 50 W/m-K
B
-2LB
C
Lc
LA = 30 mm
LB = 30 mm
Lc = 20 mm
Cold air

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