Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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On a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the resistance of the second layer is 0.3 ° C / W, and the third layer is 0.1 ° C / W. The overall temperature gradient in the wall is multilayered from one side. to the other side is 50 ° C. a. Determine the heat flux through the walls. = Answer watts / m2. b. If the thermal resistance of the second layer is changed to 0.1 ° C / W, what is the effect in% on heat flux, assuming the temperature gradient remains the same? = AnswerAnswer %.

Expert Solution
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Given Data

The thermal resistance of first layer is R1=0.005°C/W.

The thermal resistance of second layer is R2=0.3°C/W.

The thermal resistance of third layer is R2=0.1°C/W.

The temperature gradient is T=50°C.

Step 1

(a)

The expression for the total resistance of composite wall is given as,

Rth=R1+R2+R3

Substitute the values,

Rth=0.005°C/W+0.3°C/W+0.1°C/WRth=0.405°C/W

 

The expression for the heat flux can be given as,

Q=TRth

Substitute the values,

Q=70°C0.405°C/WQ=172.83 W

 

Thus, the heat flux through the walls is 172.83 W.

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