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 6 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the cycle is 330 MW. Assume that both turbine stages and both pumps have an isentropic efficiency of 83%. Determine: (a) the percent cycle thermal efficiency. (b) the mass flow rate into the first turbine stage, in kg/s.

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 6 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the cycle is 330 MW. Assume that both turbine stages and both pumps have an isentropic efficiency of 83%. Determine: (a) the percent cycle thermal efficiency. (b) the mass flow rate into the first turbine stage, in kg/s.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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 6 kPa. Saturated liquid exits the
open feedwater heater at 1 MPa. The net power output for the cycle is 330 MW. Assume that both turbine stages and both pumps
have an isentropic efficiency of 83%.
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.

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Step 1: Given Data and to find

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Step 2: T-s diagram and stage 1- stage 4 steam table enthalpy

VIEW

Step 3: stage 5- stage 7 steam table enthalpy

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Step 4: the percent cycle thermal efficiency.

VIEW

Step 5: the mass flow rate into the first turbine stage, in kg/s.

VIEW

Step 6: the mass flow rate into the first turbine stage, in kg/s.

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