Answered: Insulating material is used to reduce…

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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Question

Insulating material is used to reduce heat loss from the heating furnace walls to the room. The surface temperature of the insulating material is 100 ° C and the other surfaces 20 ° C. Allowable heat loss up to 140 W / m2 from the wall. If the thermal conductivity of the insulation material is 0.05 W / (m ° C), calculate the required thickness of insulation. insulation thickness = Answer cm

Expert Solution

Step 1

Write the equation for the rate of heat transfer per unit area.

$\frac{Q}{A} = k \frac{(T_{i} - T_{o})}{∆ t}$

Here,

Inner and outer surface temperature of the insulating material are " $T_{i}, T_{o}$ ".

Thickness of the insulating material is " $∆ t$ "

Thermal conductivity is "k"

Area of heat transfer is "A"

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