You need to design a steam turbine that will deliver 150 MW of power. The turbine can receive steam that has a pressure no greater than 10,000 kPa, at a temperature no higher than 400°C. The outlet from the turbine can be no cooler than 30°C. If superheated steam exits the turbine, the turbine has an isentropic efficiency of 0.80; however, if a saturated mixture exits the turbine, the isentropic efficiency decreases with decreasing quality following the relationship ηt 5 0.80 – (1 – xout) × 0.5 . In addition, the cost of the steam turbine increases as the mass flow rate required to flow through the turbine increases: Cost = $15,000,000 + $40,000 ṁ? . Design and price a system that will meet the demands for the steam turbine.
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