A composite wall is made up of an external thickness of brickwork 110 mm thick inside which is a layer of fiberglass 75 mm thick. The fiberglass is faced internally by an insulating board 25 mm thick. The coefficient of thermal conductivity for the three are as follows: Brickwork 1.5 W/m-K Fiberglass 0.04 W/m-K Insulating board 0.06 W/m-K The surface transfer coefficients of the inside wall is 3.1 W/m2 -K while that of the outside wall is 2.5 W/m2 -K. Take the internal ambient temperature as 10°C and the external temperature is 27°C. Determine the heat loss through such wall 6 m high and 10 m long.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A composite wall is made up of an external thickness of brickwork 110 mm thick inside
which is a layer of fiberglass 75 mm thick. The fiberglass is faced internally by an insulating
board 25 mm thick. The coefficient of thermal conductivity for the three are as follows:

Brickwork 1.5 W/m-K
Fiberglass 0.04 W/m-K
Insulating board 0.06 W/m-K
The surface transfer coefficients of the inside wall is 3.1 W/m2

-K while that of the outside

wall is 2.5 W/m2

-K. Take the internal ambient temperature as 10°C and the external
temperature is 27°C. Determine the heat loss through such wall 6 m high and 10 m long.

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