p2-tutorial_thermal_resistance.pdf - UAE UNIVERSITY MECHANICAL ENGINEERING DEPERTMENT MECH411– Heat Transfer I Tutorial problem 3-52 3-52(3-50 A

p2-tutorial_thermal_resistance.pdf - UAE UNIVERSITY...

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UAE UNIVERSITY MECHANICAL ENGINEERING DEPERTMENT MECH 411 Heat Transfer I T utorial problem: 3-52 3-52 (3-50) A 4-m-high and 6-m-wide wall consists of a long 18-cm × 30-cm cross section of horizontal bricks ( k = 0.72 W/m ⋅° C) separated by 3-cm-thick plaster layers ( k = 0.22 W/m ⋅° C). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid form ( k = 0.026 W/m ⋅° C) 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 h 1 = 10 W/m 2 ⋅° C and h 2 = 20 W/m 2 ⋅° C, respectively. Assuming one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall. Brick 30 cm Foam Plaster 1.5 cm 1.5 cm 2 cm 18 cm 2 cm 2 cm
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Solutions: Assumptions 1 Heat transfer is steady since there is no indication of change with time. 2 Heat transfer through the wall is one-dimensional. 3 Thermal conductivities are constant. 4 Heat transfer by radiation is disregarded.
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