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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?
Position control servos are discussed extensively in classical control texts. Draw a block diagram for a direct current motor position control system after consulting your classical control text. Modify the block diagram to obtain a digital positi..
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Magnetic flux density due to filamentary currents. A current I flows in a conductor shaped as an equilateral triangle (Figure 8.27). Calculate the magnetic flux density at the center of gravity of the triangle (where the three normals to the sides..
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Design a sieve plate column to perform this separation, for a feed rate of 10,000 kg/hour. Treat the feed as a binary mixture of ethanol and water. Take the feed temperature as 20 °C. The column will operate at 1 atmosphere.
Design a vapor compression cycle using ammonia as the refrigerant that will be used to maintain the temperature of a stream at - 20 °C. The evaporator is air cooled and the ambient temperature may be assumed to be 25 °C. Assume a compressor effici..
Find the ratio of the amount refluxed R to the product withdrawn (D).
When one mole of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and 100.C, 40.66 kJ of heat is released. If the density of H2O(l) at this temperature and pressure is 0.996 g/cm3, calculate E for the condensation of one mole of water at 1...
How many kg of benzene are condensed by this process per 1000 m3 of the original mixture if the vapor pressure of at 21.1oC is 75 mm Hg?
What is the result of the active NF-kB pathway? Which diseases are attributed to the NF-kB pathway?
The white precipitate remaining on the filter paper was readily soluble in ammonia solution. What two ions could have been present in the unknown?
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