Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Superheated vapor enters th

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Water Is The Working Fluid In A Regenerative Rankine Cycle With One Closed Feedwater Heater Superheated Vapor Enters Th 1 (152.6 KiB) Viewed 41 times

Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Superheated vapor enters the turbine at 10 MPa, 500 °C, and the condenser pressure is 10 kPa. Steam expands through the first-stage turbine where some is extracted and diverted to a closed feedwater heater at 0.7 MPa. Condensate drains from the feedwater heater as saturated liquid at 0.7 MPa and is trapped into the condenser. The feedwater leaves the heater at the temperature of 1.5 °C lower than the saturation temperature at 0.7 MPa. The condensate leaves the condenser as a saturated liquid. The isentropic efficiency is 84% for the turbines and pump. The net work output is 2.5 MW. a) Show the schematic of the regenerative Rankine cycle with one closed feedwater heater, including all the main components. b) Determine the steam mass flow rate through the first-stage and the second-stage turbines, in kg/s. c) Determine the heat transfer rate to the working fluid through the steam generator, in kW. Determine the thermal efficiency. d) e) Plot the T-s, p-h, and T-h diagrams for this cycle. (You may use EES to get all the data involved, then use Excel to plot the diagrams. The saturated liquid and saturated vapor lines should be presented on the diagrams.) f) Plot each of the quantities in parts b) - d) if the steam is extracted at the pressure which varies from 0.1 MPa to 9 MPa. (Condensate drains from the feedwater heater as saturated liquid at the steam extraction pressure. The feedwater leaves the heater at the temperature of 1.5 °C lower than the saturation temperature at the steam extraction pressure.) (25 points)