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A power plant is connected to a supply of 150 psia steam at 500 degrees F. The load is constant and requires throttling to 100 psia between points 1 and 2 in order to hold the load. The turbine exhausts to 2 psia. In order to conserve energy, it is desired to bleed off a fraction of the steam at point 3 (which is at 30 psia) for feed water heating so that the throttle can be fully open without changing the load. The isentropic efficiency in both turbine stages is 86%. What is the maximum percentage of steam that can be bled without reducing the work output? What is the maximum temperature to which returned water at 60 psia and 60 degrees F can be heated?
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