Question

In: Mechanical Engineering

(REGENERATIVE CYCLE WITH ONE CLOSED AND ONE OPEN HEATER): Do not use your Steam Tables. Refer...

(REGENERATIVE CYCLE WITH ONE CLOSED AND ONE OPEN HEATER): Do not use your Steam Tables. Refer to the H2O properties given in the table below.

A regenerative cycle with one stage of reheating is executed with steam expanding initially from 20 Mpaa and 540 deg C. The reheater pressure is 10 Mpaa. The steam leaves the reheater at 540 deg C. Steam is bled after reheating to one CFWH and on one OFWH a pressure equal to 5 Mpaa and 1 Mpaa respectively. The condensate of the steam used in the CFWH is routed to the OFWH through a trap. The CFWH has a Terminal Difference of 4 deg. C. Condensation occurs at 60 deg C. Sketch the equipment and TS diagram. Isentropic expansion and compression efficiencies are 90 %. nk = 80%. Answer the following for 2.0 kg/sec of total steam circulated, and fill up the blanks with your answers in the items below:

Properties of H2O

Location

H (KJ/Kg) (adiabatic efficiencies not applied)

Steam turbine entry

H1=3363.50

Steam entry to reheater

h2=3155.40

Steam from reheater to turbine

H3=3475.80

Steam entry to CFWH from turbine

H4=3250.13

Steam entry to OFWH from turbine

H5=2842.94

Steam entry to condenser

H6=2215.05

Feedwater/condensate from the condenser and at pump inlet

H7=251.13

Feedwater entry to OFWH

H8=252.13

Feedwater from OFWH

H9=762.81

Feedwater at pump outlet (pump after OFWH)

H10=784.23

Steam condensate from CFWH

H11=1154.23

Additional data

Feedwater from CFWH with TD=4 deg C applied (actual case)

H8' =1134.32 KJ/kg

Use the following data for your calculations:

1. Equipment and TS diagram of the cycle
2. Ideal ngine efficiency (%) Answer:___________________
3.Thermal efficiency of the actual cycle (%)using turbine and pump work values. Answer: _________________
4. Thermal efficiency of the actual cycle (%)using Qa and Qr values. Answer: _________________
5. Combined Steam rate (kg/kw-hr)
6. Torque produced in KN-m at the shaft connecting the generator to the turbine if brake engine efficiency = 93% and generator rpm = 15 rev per sec Answer:_______________________
7. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 10 deg C and leaves at 22 deg C, find amount of cooling water needed by the condenser in kg/sec. (Ideal cycle) Answer: _________________________

Comment if still missing and comment what is missing given.

Solutions

Expert Solution

A thumbs up, pls!!

samet mamat answered 1 year ago
Next > < Previous

Related Solutions

A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam enters the first turbine stagge 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 6 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam enters the first turbine stage at 12 MPa, 520◦C and expands to 1 MPa, where some of the steam is extracted and diverted to the open feedwater heater 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...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
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 50 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
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 28 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the...
Consider a regenerative Rankine cycle with one steam extraction point using an open feed-water heater (OFWH)....
Consider a regenerative Rankine cycle with one steam extraction point using an open feed-water heater (OFWH). P at boiler = 5 MPa T at turbine inlet = 600 0C P at OFWH = 1 MPa P at condenser = 10 kPa All device efficiencies = 1 Solve the problem analytically step by step; find all work interactions, heat transfers, and the thermal efficiency.
A steam power plant operates on a regenerative Rankine cycle with two feedwater heaters, one closed...
A steam power plant operates on a regenerative Rankine cycle with two feedwater heaters, one closed and one open. Steam enters the turbine at 12.5 MPa and 550ºC and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 1 MPa for the closed feedwater heater and 0.8 MPa for the open one. The feedwater is heated to the condensation temperature of the extracted steam in the closed feedwater heater. The extracted steam leaves the closed...
Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open...
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 1.5 MPa. Some steam is extracted at 1.5 MPa and fed to the closed feedwater heater. The remainder is reheated at 1.5 MPa to 440 °C and then expands through the second-stage turbine to 0.3 MPa, where an additional amount is extracted and fed into the open...
Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open...
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, 480°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 440°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...
Design a steam power plant that works as an ideal Regenerative Rankine cycle with 2 closed...
Design a steam power plant that works as an ideal Regenerative Rankine cycle with 2 closed feedwater heaters cascaded backwards by selecting their extraction pressures to optimize cycle efficiency. The available steam conditions at the exit of the boiler are 3 MPa and 590 °C and the condenser pressure is 20 kPa. The steam flow rate at the inlet of the turbine is 80 kg/s. A T-s diagram for the cycle should be provided along with a table showing the...
4. Consider a reheat–regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and...
4. Consider a reheat–regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 12.0 MPa, 520C and expands to 0.6 MPa. The steam is reheated to 440C before entering the second turbine, where it expands to the condenser pressure of 0.006 MPa. Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the closed heater at 200C and...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT