FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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4) 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 MW
4) 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
c) thermal efficiency of the cycle. (
Calculate the work done in the low-pressure
turbine (LPT) of a Rankine cycle with reheat.
The steam enters the LPT at 425°C & 60
MPa and leaves LPT as superheated steam
at 375°C & 50MPA. Suggest what would be
the dryness fraction of the working fluid
entering the condenser.
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- 8.35 Water is the working fluid in an ideal regenerative Rankine cycle with one closed feedwater heater. Superheated vapor enters the turbine at 10 MPa, 480°C, and the condenser pressure is 6 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 10 MPa and a temperature equal to the saturation temperature at 0.7 MPa. 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 turbine. 2624 b. the thermal efficiency. 42.7% c. the heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine. 1504.1arrow_forwardWater is the working fluid in an ideal Rankine cycle. Superheated vapor enters the turbine at 10 MPa, 550 degree Celsius. The condenser pressure is 10 kPa. The cycle is modified to include one open feedwater heater operating at 0.7 MPa. Saturated liquid exits the feedwater heater at 0.7 MPa. The new power output of the cycle is 150 MW. Determine for the cycle the rate of heat transfer to the working fluid passing through the steam generator, in kW, (b) the thermal efficiency.arrow_forwardWater is the working fluid in an ideal Rankine cycle. Superheated vapor enters the turbine at 8 MPa, 480 degree Celsius. The condenser pressure is 10 kPa. The cycle is modified to include reheat. In the modified cycle, steam expands through the first-stage turbine to 0.7 MPa and then is reheated to 480 degree Celsius. If the net power output of the modified cycle is 100 MW, determine for the modified cycle (a) the rate of heat transfer to the working fluid passing through the steam generator, in MW, (b) the thermal efficiency, (c) the rate of heat transfer to cooling water passing through the condenser, in MWarrow_forward
- An ideal Reheat-Regenerative engine operates with a boiler pressure of 8 MPa and a condenser pressure of 8 kPa. Throttle steam at 8 MPa, 480°C is expanded in the turbine to 2 MPa where it is withdrawn from the turbine and reheated to 460°C. The reheated steam then expands in the turbine to 300 kPa where a portion of the steam is extracted for feedwater heating in an open heater. The remainder of the steam continues its expansion to the condenser pressure of 8 kPa. Removing the reheater while retaining the feedwater heater, what is the: % of mass extracted? turbine work in kJ/kg? thermal efficiency? energy chargeable against the engine in kJ/kg?arrow_forwardAn ideal reheat Rankine cycle with water as the working fluid operates the inlet of the high-pressure turbine at 7000 kPa and 450°C, the inlet of the low-pressure turbine at 500 kPa and 500°C, and the condenser at 10 kPa. Determine the mass flow rate through the boiler needed for this system to produce a net 5000 kW of power and the thermal efficiency of the cycle. Use steam tables. kg/s. The mass flow rate through the boiler needed for this system to produce a net 5000 kW of power is The thermal efficiency is %.arrow_forwardAn ideal reheat Rankine cycle with water as the working fluid operates the boiler at 15,000 kPa, the reheater at 2000 kPa, and the condenser at 100 kPa. The temperature is 450C at the entrance of the high-pressure and lowpressure turbines. The mass flow rate through the cycle is 1.74 kg/s. Determine the power used by pumps, the power produced by the cycle, the rate of heat transfer in the reheater, and the thermal efficiency of this system.arrow_forward
- 8.25 Water is the working fluid in an ideal regenerative Rankine cycle. Superheated vapor enters the turbine at 10 MPa, 480°C, and the condenser pressure is 6 kPa. Steam expands through the first-stage turbine to 0.7 MPa where some of the steam is extracted and diverted to an open feedwater heater operating at 0.7 MPa. The remaining steam expands through the second-stage turbine to the condenser pressure of 6 kPa. Saturated liquid exits the feedwater heater at 0.7 MPa. Determine for the cycle a. the heat addition, in kJ per kg of steam entering the first-stage turbine. 2613.9 b. the thermal efficiency. 44.2% c. the heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine. 1458.4arrow_forwardWater is the working fluid in a Rankine cycle with reheat. Superheated vapor enters the turbine at 10 MPa, 480°C, and the condenser pressure is 6 kPa. Steam expands through the first-stage turbine to 0.7 MPa and then is reheated to 480°C. The pump and each turbine stage have an isentropic efficiency of 70%.Determine for the cycle:(a) the total heat addition, in kJ per kg of steam entering the turbine.(b) the percent thermal efficiency.(c) the magnitude of the heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.arrow_forwardWater is the working fluid in an ideal Rankine cycle with reheat. Superheated vapor enters the turbine at 10 MPa, 520°C, and the condenser pressure is 8 kPa. Steam expands through the first-stage turbine to 1.2 MPa and then is reheated to 480°C. Assume the pump and each turbine stage has an isentropic efficiency of 85% and 92%, respectively. Determine for the cycle: (a) the rate of heat addition, in kJ per kg of steam entering the first-stage turbine. (b) the thermal efficiency. (c) the rate of heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine. (d) the back work ratio.arrow_forward
- Water is the working fluid in an ideal Rankine cycle with reheat. Superheated vapor enters the turbine at 12 MPa, 440°C, and the condenser pressure is 8 kPa. Steam expands through the first-stage turbine to 1.2 MPa and then is reheated to 480°C. Assume the pump and each turbine stage has an isentropic efficiency of 85% and 92%, respectively. Determine for the cycle:(a) the rate of heat addition, in kJ per kg of steam entering the first-stage turbine.(b) the thermal efficiency.(c) the rate of heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.(d) the back work ratio.arrow_forwardmultiple choice question: Water is the working fluid in an ideal Rankine cycle with reheat. Superheated vapor enters the turbine at 12 MPa, 480°C, and the condenser pressure is 8 kPa. Steam expands through the first-stage turbine to 1.2 MPa and then is reheated to 480°C. Assume the pump and each turbine stage has an isentropic efficiency of 85% and 92%, respectively. Determine for the cycle: To solve the problem, what do you need to do? a. analyze each component as a control volume at steady state? b. analyze each component as a closed system at steady state? c. analyze each component as a transient control volume since steam is flowing through it? d. none of the abovearrow_forward3.) 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 "arrow_forward
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