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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?
The turbine develops 250 KW of power, which is transmitted to the gears such that C receives 60% and D receives 40%, figure 5. Determine the absolute maximum shear stress in the shaft
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R134a rests in a compressed fluid can at 120psia, and a specific volume of 0.38ft3/lbm. What is its temperature and quality? Half of the mass is now vented off to the atmosphere. The can is allowed to exchange heat with the surroundings at 100°F unt..
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ENGR 1210:What are the 4 strengthening mechanisms of metals
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