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The Department of Energy projects that between the yeras 1995 and 2010, the United States will need to build new power plants to generate an additional 150,000 MW of electricity to meet the increasing demand for electric power. One possibility is to build coal-fired power plants, which cost $1300 per kW to construct and have an efficiency of 40%. Another possibility is to use the clean-burning Integrated Gasification Combined Cycle (IGCC) plants where the coal is subjected to heat and pressure to gasify it while removing sulfur and particulate matter from it. The gaseous coal is then burned in a gas turbine, and part of the waste heat from the exhaust gasses is recovered to generate steam for the steam turbine. Currently the construction of IGCC plants costs about $1500 per kW, but their efficiency is about 48%. The average heating value of the coal is about 28,000,000 kJ per ton (that is, 28,000,000 kJ of heat is released when 1 ton of coal is burned). If the IGCC plant is to recover its cost difference from fuel savings in five years, determine what the price of coal should be in $ per ton.
a high-strength steel drill rod used for boring a hole in the earth has a diameter of 0.5 in. the allowable shear
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showing the two upward pulls of the rings on his hands, each of size 380N. Calculate the angle between the wires supporting the rings and the vertical.
a 40-mph wind below past your house speeds up as it flows up and over the roof.nbspif the elevation effects are
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considering a river flowing toward a lake which is 40 m below. it is known that the river flows at a constant velocity
a pressure transducer behaves as a second-order system. if the undamped natural frequency is 10 khz and the damping is
a timber beam is to be selected to sustain a maximum transverse shear of vmax 50 kn without exceeding an allowable
the 4 in diameter brass shaft shown is fixed at end a and fastened securely to a rigid horizontal member at end b.
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