17. There are developed 25,000 kW by a reheat-regenera- tive engine (turbogenerator) which receives steam at...
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17. There are developed 25,000 kW by a reheat-regenera- tive engine (turbogenerator) which receives steam at 4.2 MPa, 205°C and exhaust at 0.007 MPa. At 1.90 MPa and 215¢C, part of the steam is extracted for feedwater heating and the remainder is withdrawn for reheating. The reheated steam enters the turbine at 1.8 MPa and 270°C and expands to 1.38 MPa, where more steam is extracted for feedwater heating and the remainder expands to the condenser pressure of 0.007 MPa and an actual quality of 90%. Feedwater leaves the last heater at a temperature of 207°C. The generator has an efficiency of 95%. For the ideal engine, find (a) the percent- ages of the extracted steam, (b) W, and (c) e. Let the actual extracted steam be 85% of those for the ideal engine and for the actual engine, find (d) the total throttle flow, if the break work equal the fluid work, (e) e, and (f) n, Ans. (a) 0.035, 0.234; (b) 833 kJ/kg; (c) 37.2% (e) e,, and (f) n. (d) 147,000 kg/h; (e) 27.5%; (f) 73.6% 17. There are developed 25,000 kW by a reheat-regenera- tive engine (turbogenerator) which receives steam at 4.2 MPa, 205°C and exhaust at 0.007 MPa. At 1.90 MPa and 215¢C, part of the steam is extracted for feedwater heating and the remainder is withdrawn for reheating. The reheated steam enters the turbine at 1.8 MPa and 270°C and expands to 1.38 MPa, where more steam is extracted for feedwater heating and the remainder expands to the condenser pressure of 0.007 MPa and an actual quality of 90%. Feedwater leaves the last heater at a temperature of 207°C. The generator has an efficiency of 95%. For the ideal engine, find (a) the percent- ages of the extracted steam, (b) W, and (c) e. Let the actual extracted steam be 85% of those for the ideal engine and for the actual engine, find (d) the total throttle flow, if the break work equal the fluid work, (e) e, and (f) n, Ans. (a) 0.035, 0.234; (b) 833 kJ/kg; (c) 37.2% (e) e,, and (f) n. (d) 147,000 kg/h; (e) 27.5%; (f) 73.6%
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Related Book For
Fundamentals of Thermodynamics
ISBN: 978-0471152323
6th edition
Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen
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