Tutorial 2.doc - HEAT AND MASS TRANSFER BMCT 3143 TUTORIAL...

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HEAT AND MASS TRANSFER BMCT 3143 TUTORIAL 02 DR MOHD YUSOFF SULAIMAN JUN2010 HEAT AND MASS TRANSFER BMCT 3143 TUTORIAL 02 – Steady State Conduction – One Dimension 1. Find the heat transfer per unit area through the composite wall sketched. Assume one- dimensional heat flow. 2. An ice chest is constructed of Styrofoam [k=0.033 W/m K] with inside dimensions of 25 by 40 by 100 cm. The wall thickness is 5.0cm. The outside of the chest is exposed to air at 25 o C with h=20 W/m 2 K. if the chest is completely filled with ice, calculate the time for the ice to completely melt. State your assumptions. The heat of fusion for water is 330kJ/kg. 3. A spherical tank, 1 m in diameter, is maintained at a temperature of 120 o C and exposed to a convection environment. With h=25 W/m 2 K and T =15 o C, what thickness of urethane foam should be added to ensure that the outer temperature of the insulation does not exceed 40 o C? What percentage reduction in heat loss results from installing this insulation?
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