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tutorial 3 heat transfer question 3

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3-54 A 4-m-high and 6 m wide wall consists of a long l5-cm X 25-cm cross section of horizontal bricks (k = 0.72 W/m-K) separated by 3-cm-thick plaster layers (k = 0.22 W/m-K). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid foam (k = 0.026 W/m-K) on the inner side of the wall. The indoor and the outdoor temperatures are 22°C and -4°C, and the convection heat transfer coefficients on the inner and the outer sides are h1 = l0 W/m2-K and h2 = 20 W/m2-K, respectively. Assuming one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall.

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Heat Mass Transfer Ch3 Tutorial

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Page 1: Tutorial 3 Heat Transfer Question 3

3-54 A 4-m-high and 6 m wide wall consists of a long l5-cm X 25-cm cross section of horizontal bricks (k = 0.72 W/m-K) separated by 3-cm-thick plaster layers (k = 0.22 W/m-K). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid foam (k = 0.026 W/m-K) on the inner side of the wall. The indoor and the outdoor temperatures are 22°C and -4°C, and the convection heat transfer coefficients on the inner and the outer sides are h1 = l0 W/m2-K and h2 = 20 W/m2-K, respectively. Assuming one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall.

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