A Rankine power cycle uses a thermal heat source to generate steam. The heat source is...
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A Rankine power cycle uses a thermal heat source to generate steam. The heat source is 1700 K and the plant rejects waste heat to a body of water at 300 K Water exits the condenser as a saturated liquid. The pumps and turbines are internally reversible. The pressure and temperature at the inlet to the high pressure turbine are 620 °C and 27 MPa. The steam pressure drops by a factor of 10 as it expands through the high pressure turbine. • The reheater returns the steam exiting the high pressure turbine to the same temperature as the boiler/superheater exit. • Steam is extracted from the low-pressure turbine at a pressure of 1200 kPa and fed to an open feedwater heater operating at the same pressure. • The rest of the steam exits the low pressure turbine and enters the condenser. The temperature of the condenser is 30 K warmer than the low temperature reservoir. Saturated liquid leaving the condenser is isentropically pressurized to the same pressure as the open feedwater heater and the saturated liquid leaving the open feedwater heater is isentropically pressurized to the boiler operating pressure. • The mass flow rate of steam through the boiler is 100 kg/s. Boiler & Superheater Open Feedwater Heater High Pressure Turbine 1:04 Pump Reheater Condenser Low Pressure Turbine Pump a) Populate the following scorecard of temperature, pressure, quality (if the state lies in the two-phase region), enthalpy, and entropy for each state. (39 points) b) Plot a T-s diagram for the cycle, including the vapor dome. For the states and the vapor dome, you may either draw these by hand or electronically plot them. For electronic plots, you may free-hand sketch the paths connecting each state. Screenshots from thermofluids are not acceptable. (7 points) Note: The steam becomes supercritical fluid from State 2 to 3. c) What fraction of the steam mass flow is extracted from the low pressure turbine? (4 points) d) What is the efficiency of the power plant? (4 points) e) What is the net mechanical work, in MW? (5 points) 1) What is the rate of entropy generation by the open feedwater heater, in KW/K? Why does the open feedwater heater generate entropy? (7 points) A Rankine power cycle uses a thermal heat source to generate steam. The heat source is 1700 K and the plant rejects waste heat to a body of water at 300 K Water exits the condenser as a saturated liquid. The pumps and turbines are internally reversible. The pressure and temperature at the inlet to the high pressure turbine are 620 °C and 27 MPa. The steam pressure drops by a factor of 10 as it expands through the high pressure turbine. • The reheater returns the steam exiting the high pressure turbine to the same temperature as the boiler/superheater exit. • Steam is extracted from the low-pressure turbine at a pressure of 1200 kPa and fed to an open feedwater heater operating at the same pressure. • The rest of the steam exits the low pressure turbine and enters the condenser. The temperature of the condenser is 30 K warmer than the low temperature reservoir. Saturated liquid leaving the condenser is isentropically pressurized to the same pressure as the open feedwater heater and the saturated liquid leaving the open feedwater heater is isentropically pressurized to the boiler operating pressure. • The mass flow rate of steam through the boiler is 100 kg/s. Boiler & Superheater Open Feedwater Heater High Pressure Turbine 1:04 Pump Reheater Condenser Low Pressure Turbine Pump a) Populate the following scorecard of temperature, pressure, quality (if the state lies in the two-phase region), enthalpy, and entropy for each state. (39 points) b) Plot a T-s diagram for the cycle, including the vapor dome. For the states and the vapor dome, you may either draw these by hand or electronically plot them. For electronic plots, you may free-hand sketch the paths connecting each state. Screenshots from thermofluids are not acceptable. (7 points) Note: The steam becomes supercritical fluid from State 2 to 3. c) What fraction of the steam mass flow is extracted from the low pressure turbine? (4 points) d) What is the efficiency of the power plant? (4 points) e) What is the net mechanical work, in MW? (5 points) 1) What is the rate of entropy generation by the open feedwater heater, in KW/K? Why does the open feedwater heater generate entropy? (7 points)
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Step 1 The Rankine cycle is a thermodynamic cycle that describes the process by which certain heat e... View the full answer
Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
Posted Date:
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