Consider a wall that consists of two layers, A and B, with the following values: kA = 0.8 W/m⋅ºC, LA = 8 cm, kB = 0.2 W/m⋅ºC, LB = 5 cm. If the temperature drop across the wall is 18ºC, the rate of heat transfer through the wall per unit area of the wall is   a. 89.6 W/m2 b. 72.0 W/m2 c. 153 W/m2 d. 51.4 W/m2  e. 180 W/m2

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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Consider a wall that consists of two layers, and B, with the following values: k= 0.8 W/m⋅ºC, L= 8 cm, k= 0.2 W/m⋅ºC, L= 5 cm. If the temperature drop across the wall is 18ºC, the rate of heat transfer through the wall per unit area of the wall is


 

a.

89.6 W/m2

b.

72.0 W/m2

c.

153 W/m2

d.

51.4 W/m2 

e.

180 W/m2

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