Question

8.11 Rankine Cycle with Efficiencies

(8.2 information) Water is the working fluid in an ideal Rankine cycle. Superheated vapor enters the turbine at 8 MPa, 480 degrees Celsius. The condenser pressure is 8kPa. The net power output of the cycle is 100 MW.

(8.11) Reconsider the analysis of Problem 8.2, but include the analysis that the turbine and pump have isentropic efficiencies of 85 and 70%, respectively. Determinefor the modified cycle
(a) the thermal efficiency.
(b) the mass flow rate of steam, in kg/h, for a net power output of 100 MW.
(c) the mass flow rate of condenser cooling water, in kg/h if the cooling water enters the condenser at 15 degrees Celsius and exits at 35 degrees Celsius withnegligible pressure change.

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