A composite wall is made up of an external thickness of brickwork 11 cm thick, inside which is a layer of fiber glass 7.5 cm thick. The fiber glass is faced internally by an insulating board 2.5 cm thick. The coefficient of thermal conductivity for the three are as follows; Brickwork - 1.5 W/m-C Fiber Glass -0.04 W/m-C Insulating Board - 0.06 W/m-C The surface transfer coefficient of the inside wall is 3.1 Wm2-C while that of the outside wall is 2.5 Wm2-C. Determine the overall coefficient of heat transfer and the heat loss through such a wall 6 m high and 10 m long. Take the internal ambient temperature as 10C and the external temperature as 27C. 2.

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 11 cm thick, inside which is a layer of fiber glass 7.5 cm thick. The fiber glass is faced internally by an insulating board 2.5 cm thick. The coefficient of thermal conductivity for the three are as follows; Brickwork - 1.5 W/m-C Fiber Glass -0.04 W/m-C Insulating Board - 0.06 W/m-C The surface transfer coefficient of the inside wall is 3.1 Wm2-C while that of the outside wall is 2.5 Wm2-C. Determine the overall coefficient of heat transfer and the heat loss through such a wall 6 m high and 10 m long. Take the internal ambient temperature as 10C and the external temperature as 27C. 2. 

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