Q1) A steam power plant operates on the reheat-regenerative Rankine cycle with a closed feedwater heater. Steam enters the turbine at 12.5 MPa and 550°C at a rate of 24 kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550°C. Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed in the closed feedwater heater, and pumped to 12.5 MPa before it mixes with the feedwater at the same pressure. Assuming an isentropic efficiency of 88 percent for both the turbine and the pump, determine (a) the temperature of the steam at the inlet of the closed feedwater heater, (b) the mass flow rate of the steam extracted from the turbine for the closed feedwater heater, (c) the net power output, and (d) the thermal efficiency.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Q1) A steam power plant operates on the reheat-regenerative Rankine cycle with a closed
feedwater heater. Steam enters the turbine at 12.5 MPa and 550°C at a rate of 24 kg/s and is
condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550°C.
Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed
in the closed feedwater heater, and pumped to 12.5 MPa before it mixes with the feedwater
at the same pressure. Assuming an isentropic efficiency of 88 percent for both the turbine
and the pump, determine (a) the temperature of the steam at the inlet of the closed
feedwater heater, (b) the mass flow rate of the steam extracted from the turbine for the
closed feedwater heater, (c) the net power output, and (d) the thermal efficiency.
High-P
turbine
Low-P
Boiler
turbine
Closed
Mixing
FWH
chamber
10
Condenser
PII
PI
Transcribed Image Text:Q1) A steam power plant operates on the reheat-regenerative Rankine cycle with a closed feedwater heater. Steam enters the turbine at 12.5 MPa and 550°C at a rate of 24 kg/s and is condensed in the condenser at a pressure of 20 kPa. Steam is reheated at 5 MPa to 550°C. Some steam is extracted from the low-pressure turbine at 1.0 MPa, is completely condensed in the closed feedwater heater, and pumped to 12.5 MPa before it mixes with the feedwater at the same pressure. Assuming an isentropic efficiency of 88 percent for both the turbine and the pump, determine (a) the temperature of the steam at the inlet of the closed feedwater heater, (b) the mass flow rate of the steam extracted from the turbine for the closed feedwater heater, (c) the net power output, and (d) the thermal efficiency. High-P turbine Low-P Boiler turbine Closed Mixing FWH chamber 10 Condenser PII PI
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