A1S - CHG 2314 HEAT TRANSFER Professor B Kruczek Assignment...

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CHG 2314 HEAT TRANSFER Professor: B. Kruczek 2005/01/14 Assignment No. 1 1. The hot combustion gases of a furnace are separated from the ambient air and its surroundings, which are at 25 o C, by a brick wall 0.15 m thick. The brick has a thermal conductivity of 1.2 W/m K and a surface emissivity of 0.7. Under the steady- state conditions an inner surface is at 350 o C. Free convection heat transfer to the air adjoining the outer surface is 20 W/m 2 K. What is the brick outer surface temperature? To reduce the risk of burn injuries to operating personnel, the outer surface should be maintained at or below 65 o C. What should be the minimum thickness of the brick wall to accomplish this goal? 2. Problem 1.38. 3. Problem 1.70. Due Date: Jan 21, 2005 at 4:00 p.m. in the assignment box.
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Problem 2 Known: 1. Initial temperature of water and tank volume 2. Power dissipation emissivity 3. Diameter and length of heater 4. Expressions for convection coefficient Unknown: 1. Time to raise temperature of water to prescribed value 2.
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