FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam enters the first turbine stage at 12 MPa, 560°C and expands to 1 MPa, where some of the steam is extracted and diverted to the open feedwater heater operating at 1 MPa. The remaining steam expands through the second turbine stage to the condenser pressure of 17 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the cycle is 215 MW.For isentropic processes in the turbines and pumps, determine:(a) the percent cycle thermal efficiency.(b) the mass flow rate into the first turbine stage, in kg/s.(c) the rate of entropy production in the open feedwater heater, in kW/K.
2. Consider a regenerative vapor power cycle with one open feedwater heater. Steam enters the turbine at 8.0 MPa,
480°C and expands to 0.7 MPa, where some of the steam is extracted and diverted to the open feedwater heater
operating at 0.7 MPa. The remaining steam expands through the second-stage turbine to the condenser pressure of
0.008 MPa. Saturated liquid exits the open feedwater heater at 0.7 MPa. The isentropic efficiency of each turbine
stage is 85% and each pump operates isentropically. If the net power output of the cycle is 100 MW, determine (a)
the thermal efficiency and (b) the mass flow rate of steam entering the first turbine stage, in kg/h.
3.)
A steam power plant uses the ideal Reheat-Regenerative Rankine cycle where
the steam enters the high-pressure turbine at 4 MPa and 300C. It partially
expands to 600 kPa where some steam is extracted for feedwater heating while
the rest is reheated to the same temperature. After expanding again, it enters
the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram
with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt,
Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump
work.
kJ
kj
kJ
kJ
kJ
kg
1715.88-
20.01%, 2667.84-
955.97 3.74 951.96 35.68%, 3.78.
"
J
kg
kg
kg
kg
kWh
kg
"
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Similar questions
- 3.) A steam power plant uses the ideal Reheat-Regenerative Rankine cycle where the steam enters the high-pressure turbine at 4 MPa and 300C. It partially expands to 600 kPa where some steam is extracted for feedwater heating while the rest is reheated to the same temperature. After expanding again, it enters the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt, Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump work. kg 20.01%, 2667.841715.52955.97 k, 3.74, 952.32,35.69%, 3.78 kg kWh Specific Volume Internal Energy Temp Enthalpy Prom MP Entropy Sal Sat, Sat. Liquid Sat. Sat. Liquid Evap. Vapor Liquid Uy Evap. Sat. Vapor t Р 10% Evap. Vapor Up u, hr Liquid S, h h₂ 8% 8₂ 006113 .01 1.0002 206 136 .0007 1.89 1.0001 181 255 3.77 1.0001 159 675 1.0001 142 789 0005 ,00 2375.3 2375.3 7.90 2370.0 2377.9 15.81 2364.7 2380.6 22.88 2360.0 2382.9 01 2501.3 2501.4 7.91 2496.9…arrow_forwardA Steam Power Plant operates in a reheat-regenerative cycle. The steam enters the turbine at 103,000 kg/hr with a pressure of 15 MPaa, 530 C and expand to 5 MPaa. After the expansion the steam is reheated and reenters the turbine at 530 C. Steam extraction occurs at 2.0 MPaa for feedwater heating in the open feed water heater and the remaining expands to 50 kPaa in the condenser. Determine: 1. The mass of steam extracted, kg/hr 2. The cycle thermal efficiency, % 3. The engine thermal efficiency, % 4. The cycle steam rate, kg/kW-hr 5. The amount of circulating water(gpm) in the condenser if the temperature rise is 15 C.arrow_forwardI need the answer as soon as possiblearrow_forward
- A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam enters the first turbine stage at 12 MPa, 520C and expands to 1 MPa, where some of the steam is extracted and diverted to the open feedwater heater operating at 1 MPa. The remaining steam expands through the second turbine stage to the condenser pressure of 6 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. For isentropic processes in the turbines and pumps, determine for the cycle (a) the thermal efficiency and (b) the mass flow rate into the first turbine stage, in kg/h, for a net power output of 330 MW.arrow_forwardA steam power plant operates between the pressure limit of 3.0 Mpa for the boiler and 75 kPa for the condenser. The plant operates in an ideal Rankine cycle with reheater with superheated vapor enters the high pressure turbine at 3 Mpa and 300 oC, and leaves at 1 MPa. Steam is then reheated at constant pressure to 300 oC before it is expanded to 75 kPa in a low pressure turbine. Determine:a) the moisture content at the inlet of the condenser,b) the net work per unit mass of steam flowing, in kJ/kg,c) the heat transfer to the steam in the boiler in kJ per kg of steam,d) the thermal efficiency,e) the heat transfer to cooling water passing through the condenser, in kJ per kg of steam flowing. h1 (kJ/kg) Format : 563.82 v1 (m3/kg) Format : 0.002063 h2 (kJ/kg) Format : 586.86 h3 (kJ/kg) Format : 6948.7 s3 (m3/kg) Format : 8.2883 x4 Format : 0.5509 h4 (kJ/kg) Format : 7533.46 h5 (kJ/kg) Format : 8082.4 s5 (m3/kg) Format : 5.8565 x6 Format : 0.545 h6…arrow_forwardConsider a water-ammonia binary vapor cycle consisting. In the steam cycle, superheated vapor enters the turbine at 7 MPa, 450°C, and saturated liquid exits the condenser at 55°C. The heat rejected from the steam cycle is provided to the ammonia cycle, producing saturated vapor at 45°C, which enters the ammonia turbine. Saturated liquid leaves the ammonia condenser at 1 MPa. For a net power output of 24 MW from the binary cycle, determine (a) the mass flow rates for the steam and ammonia cycles, respectively, in kg/s, (b) the power output of the steam and ammonia turbines, respectively, in MW. (c) the rate of heat input to the ammonia cycle, in MW, (d) the rate of heat addition to the binary cycle, in MW, and (e) the thermal efficiency of the binary vapor cycle.arrow_forward
- In the Steam Power Plant, superheated steam at 50 bar and 600C was expanded in the turbine down to the condenser pressure of 0.2 bar. If the plant is modified to Rankine Cycle with Reheater, the steam at 50 bar and 600C enters the high-pressure turbine and is expanded to 5 bar. The exhaust steam flows through the reheater where it is heated to 400C at constant pressure. Then the reheated steam is further expanded in the low pressure turbine to the condenser pressure of 0.2 bar. Find the change in net work and the cycle efficiency.arrow_forwardAn ideal regenerative steam power cycle operates with steam that enters the turbine at 30 bars and 500°C and leaves the condenser as a saturated liquid at 0.1 bar. A single closed feed water heater is used with steam entering at 5 bars. Determine the thermal efficiency of the cyclearrow_forward2.) A steam power plant uses the ideal Regenerative Rankine cycle with single open feedwater heater where the steam enters the high-pressure turbine at 4 MPa and 300C. It partially expands to 600 kPa then some steam is extracted at this point. The remaining steam expands and enters the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt, Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump work. kJ kg 20.01%, 2286.801457.51,832.54 3.34,829.2936.26%, 4.34. ) kg kWharrow_forward
- Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open one, and reheat. Steam enters the first turbine stage at 12 MPa, 560°C, and expands to 2 MPa. Some steam is extracted at 2 MPa and fed to the closed feedwater heater. The remainder is reheated at 2 MPa to 520°C and then expands through the second-stage turbine to 0.3 MPa, where an additional amount is extracted and fed into the open feedwater heater operating at 0.3 MPa.The steam expanding through the third-stage turbine exits at the condenser pressure of 60 kPa. Feedwater leaves the closed heater at 210°C, 12 MPa, and condensate exiting as saturated liquid at 2 MPa is trapped into the open feedwater heater. Saturated liquid at 0.3 MPa leaves the open feedwater heater. Each turbine stage and the pumps have an isentropic efficiency of 80%.Determine for the cycle:(a) the heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam entering the first-stage…arrow_forward4) In a reheat Rankine cycle, water vapor enters the high-pressure turbine at 9MPa and 450°C. It is expanded to an intermediate pressure of 0.8MPa and enters the low-pressure turbine with a temperature of 400°C. Condenser pressure is 7.5kPa and water enters the pump as a saturated liquid. There is no pressure loss in the piping that connects the cycle components. Water mass flow rate is 60 kg/s and both turbines have an isentropic efficiency of 90%. Calculate mankan kunne tħe b) net power output, in MWarrow_forward4) In a reheat Rankine cycle, water vapor enters the high-pressure turbine at 9MPa and 450°C. It is expanded to an intermediate pressure of 0.8MPa and enters the low-pressure turbine with a temperature of 400°C. Condenser pressure is 7.5kPa and water enters the pump as a saturated liquid. There is no pressure loss in the piping that connects the cycle components. Water mass flow rate is 60 kg/s and both turbines have an isentropic efficiency of 90%. Calculate a) heat transfer from the condenser, in MWarrow_forward
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