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Steam at 3MPa and 700 degrees C is available at one location in an industrial plant. At another location, steam at 2MPa, 400 degrees C and mass flow rate of 1kg/s is required for use in a process. An engineer suggests that steam at this condition can be provided by allowing the higher pressure steam to expand through a valve to 2MPa and then flow through a heat exchanger where the steam cools at constant pressure to 400 degree C by heat transfer to the surroundings at 20 degree C. Assume To= 20 degrees C.
(a) Determine the total rate of exergy destruction that would result from the implementation of this recommendation.
(b) If energy costs 8 cents per kW h, determine the annual cost of the exergy destruction determined in part a) for 8000 hours of per year operation.
(c) Comment on this suggestion, what are the pros and cons for implementation. What solution would you propose?
two 150lb engineering students a and b intend to jump off the bridge from rest using an elastic cord bungee cord having
In the gear-and-shaft system shown, the shaft diameters are dab= 2 in. and dcd=1.5 in. Knowing that G = 11.2 x10^6 psi, determine the angle through which end d of shaft cd rotates.
Important information about Overall Heat Transfer Coefficient A copper sphere of internal diameter 2 m and wall thickness 40 mm is insulated with 75 mm of expanded polystyrene
consider entropy balance equation for human engines. humans loose heat at the rate of 80 w from the body which is
some aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 35 mpa ?m.
a uniform chain of total mass m and total length l lies in a heap on a table. one end is pulled upwards at constant
an electric power plant uses solid waste for fuel in the production of electricity. the cost y in dollars per hour to
Determination of the open-loop system
a vertical pipe conveying water tapers from 50 mm in diameter at the top to 25 mm in diameter at the bottom in a length
Calculate the static thrusts of the rocket and turbojet engine described in the figure. The thrust T is the force necessary to prevent horizontal movement of the engine. Both engines exhaust a mass flow of 40 kg/s.
a tank of compressed air is at 40 degrees c and 10 atm. 1 third of the gas is removed for inflating a car tire. the
The magnitude of the horizontal(to the right) for F1 is 5kN and F1 + F2 + F3 = 0. What are the magnitude of F2 and F3?
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