A furnace is made of red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. What is the thickness if it is replaced by a layer of diatomite earth of conductivity 0.14 W/mK under the same heat loss per unit area and same temperature drop?

A furnace is made of red brick wall of thickness 0.5 m and conductivit

1.	A furnace is made of red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. What is the thickness if it is replaced by a layer of diatomite earth of conductivity 0.14 W/mK under the same heat loss per unit area and same temperature drop?
A.	0.5 m
B.	0.1 m
C.	0.2 m
D.	0.9 m
Answer» C. 0.2 m

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A furnace is made of red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. What is the thickness if it is replaced by a layer of diatomite earth of conductivity 0.14 W/mK under the same heat loss per unit area and same temperature drop?

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