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conductivity for B material (kB)

conductivity for B material (kB)

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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Hi, can you solve this problem for me please ? The lesson name is Heat Transfer. I did not solve. Thanks! 

 

The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, ka =25 W/m K and kc =60 W/m.K, and known thickness, LA =0.40 m and Lc =0.2 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB = 0.2 m, but unknown thermal conductivity kB. Under steady-state operating conditions, measurements reveal an outer surface temperature of T30=20°C, an inner surface temperature of Tsi =600°C , and an oven air temperature of T= 800°C . The inside convection coefficient h is known to be 25 W/m?.K. Draw the equivalent thermal circuit then calculate the value of thermal conductivity for B material (kB) Ts i T. S,0 KA kg kc Air T, h LA LB My
Transcribed Image Text:The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, ka =25 W/m K and kc =60 W/m.K, and known thickness, LA =0.40 m and Lc =0.2 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB = 0.2 m, but unknown thermal conductivity kB. Under steady-state operating conditions, measurements reveal an outer surface temperature of T30=20°C, an inner surface temperature of Tsi =600°C , and an oven air temperature of T= 800°C . The inside convection coefficient h is known to be 25 W/m?.K. Draw the equivalent thermal circuit then calculate the value of thermal conductivity for B material (kB) Ts i T. S,0 KA kg kc Air T, h LA LB My
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