The inner and outer surfaces of a 4-m?×?7-m brick wall of thickness 30 cm and thermal conductivity 0.69?W/m•K are maintained at temperatures of 20°?C and 5°?C, respectively. Determine the rate of heat transfer through the wall in W.
The inner and outer surfaces of a brick wall are maintained at specified temperatures. The rate of heat transfer through the wall is to be determined.
Assumptions 1 Steady operating conditions exist since the surface temperatures of the wall remain constant at the specified values. 2 Thermal properties of the wall are constant.
Properties The thermal conductivity of the wall is given to be k = 0.69 W/m?*C.
Analysis Under steady conditions, the rate of heat transfer through the wall is
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