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A 0.20-m-diameter, thin walled steel pipe is used to transport saturated steam at a pressure of 20 bars (Tsat= 486 K) in a room for which the temperature is 25oC and the convection heat transfer coefficient at the outer surface of the pipe is 20 W/m2-K. (a) What is the heat loss per unit length from the bare pipe (no insulation)? Estimate the heat loss per unit length if a 50-mm-thick layer of insulation (magnesia with k = 0.058 W/m-K) is added. The steel and magnesia may each be assumed to have an emissivity of 0.8, and the steam-side convection resistance may be neglected. (b) The costs associated with generating the steam and installing the insulation are known to be $4/109J and $100/m of pipe length, respectively. If the steam line is to operate 7500 h/yr, how many years are needed to pay back the initial investment in insulation?
determine the horsepower input for a motor necessary to lift a 200 kg box at a constant rate of 2 ms. the overall
a knoop microhardness measurement was made on a sample that resulted in a khn of 481when a load of 5120 kg was applied.
imagine a thin cylinder of initial internal diameter do initial wall thickness to and initial fixed length fixed by two
Rigid bar ABC is supported by bronze rod (1) and aluminum rod (2), as shown. A concentrated load P is applied to the free end of aluminum rod (3). Bronze rod (1) has an elastic modulus of E1 = 15,000 ksi and a diameter of d1 = 0.45 in. Aluminum rod (..
hydrogen gas at 35ordmc and unknown pressure state 1 enters a steady insulated system which has no work interaction
an incompressible velocity field is given byuurthetazurrthetazuthetarthetazuzrthetaz1-1r2costheta -11r2sintheta 0adoes
When 0.848 g of finely divided iron is burned, 1.212 g of a reddish brown oxide is obtained. Write a balanced chemical equation for the reaction of iron and molecular oxygen based on the empirical formula.
for a metal that has the simple cubic crystal structure calculate the atomic radius if the metal has a density of 8.38
the entire assembly is placed in an environment whose temperature is 200c. determine the volume of chamber 1 when thermodynamic equillibrium has been estabilished.
1. consider the hoover dam hydro-electric plant located in arizona and nevada. if the average lake level is 160 m above
the work on a system with a mass 100 lbm is known to be 10 btus. if there is no change in potential energy and the
a wheatstone bridge initially has resistances equal to r1 200 omega r2 400 omega r3 500 omega and r4 600 omega .
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