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Hot air flows from a furnace through a 0.15-m-diameter, thin-walled steel duct with a velocity of 3 m/s. The duct passes through the crawlspace of a house, and its uninsulated exterior surface is exposed to quiescent air and surroundings at 0°C.
(a) At a location in the duct for which the mean air temperature is 70°C, determine the heat loss per unit duct length and the duct wall temperature. The duct outer surface has an emissivity of 0.5.
(b) If the duct is wrapped with a 25-mm-thick layer of 85% magnesia insulation (k = 0.050 W/m· K) having a surface emissivity of ε = 0.60, what are the duct wall temperature, the outer surface temperature, and the heat loss per unit length?
Estimate the cost of the following items of equipment: a. A packaged boiler to produce 20,000 kg/h of steam at 40 bar
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As a young and ambitious engineer you seek ways to improve the process. What is the maximum amount of work that you could extract from this system? Assume that the inlet and outlet conditions of the exhaust gas remain the same.
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