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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?
a power plant burns 1000 kg of coal per hour to produce a net output of 500 kw of electrical power. assuming each kg of
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Twenty-five samples of steel beam were chosen and tested for Young's Modulus. Eight had a modulus of E = 30 x 10^6 psi. Two had a modulus of E = 29 x 10^6 psi. Fifteen had a modulus of E = 30. x 1-^6 psi.
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Find the capacity of a cylindrical tank that is 250 feet in diameter and 30 feet high? In the above problem, what is the capacity if the tank is 75% full, and what is the capacity in gallons?
oxygen is flowing through a nominal 2 inch schedule 40 steel pipe pipe at a velocity of 10 fts. the oxygen is at a
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