Applying the Exergy Balance: Control Volumes at Steady State
Steam enters an insulated turbine operating at steady state at 100 lbf/in.2, 500°F, with a mass flow rate of 3 × 105 lb/h and expands to a pressure of 1 atm. The isentropic turbine efficiency is 80%. If exergy is valued at 8 cents per kW · h, determine
(a) the value of the power produced, in $/h.
(b) the cost of the exergy destroyed, in $/h.
(c) Plot the values of the power produced and the exergy destroyed, each in $/h, versus isentropic efficiency ranging from 80 to 100%.
Ignore the effects of motion and gravity. Let T0 = 70°F, p0 = 1 atm.
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