A composite wall is made up of two layers of bricks each 100 mm thick with a 50 mm air space between them. The coefficients of thermal conductivity are
Inside brick - 0.6 W/m K
Air - 0.025 W/m K
Outside brick - 0.8 W/m K
The wall is 6.15 m long and 5.5 m high.
a. Determine the heat loss per hour through the wall if the inside face temperature is 24oC and the outside face temperature is 7oC
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