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24 May, 18:26

The brick wall (of thermal conductivity 1.12 W/m · ◦ C) of a building has dimensions of 2.8 m by 5 m and is 8 cm thick. How much heat flows through the wall in a 16.7 h period when the average inside and outside temperatures are, respectively, 12◦C and 3◦C? Answer in units of

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  1. 24 May, 18:49
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    If H be the heat flowing in time t through an area of A having thickness d

    H = k A x (θ₂ - θ₁) t / d, k is thermal conductivity, (θ₂ - θ₁) is temperature difference of walls

    putting the given values

    = (1.12 x 2.8x 5 x 9 x 16.7 x 60 x 60) /.08

    = 1.06 x 10⁸ J.
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