9. In a reheat cycle steam at 15 MPa, 540C enters the engine and expands to...
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9. In a reheat cycle steam at 15 MPa, 540°C enters the engine and expands to 1.95 MPa At this point the steam is withdrawn and passed through a reheater. It reenters the engine at 540°C. Expansion now occurs to the condenser pressure of 0.0035 MPa. (a) For the ideal cycle, find e, (b) A 60,000 kw turbine operates between the same state points except that the steam enters the reheater at 1.95 MPa and 260°C, departs at 1.8 MPa and 540°C. The steam flow is 147,000 kg/hr, generator efficiency is 96%. For actual engine, find e,, m, and n. (c) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work. Ans.: (a) 46.1%, (b) 37.3%, 2.45 kg/kwh, 79.3%, (c) 2489.6 9. In a reheat cycle steam at 15 MPa, 540°C enters the engine and expands to 1.95 MPa At this point the steam is withdrawn and passed through a reheater. It reenters the engine at 540°C. Expansion now occurs to the condenser pressure of 0.0035 MPa. (a) For the ideal cycle, find e, (b) A 60,000 kw turbine operates between the same state points except that the steam enters the reheater at 1.95 MPa and 260°C, departs at 1.8 MPa and 540°C. The steam flow is 147,000 kg/hr, generator efficiency is 96%. For actual engine, find e,, m, and n. (c) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work. Ans.: (a) 46.1%, (b) 37.3%, 2.45 kg/kwh, 79.3%, (c) 2489.6
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Related Book For
Fundamentals of Thermodynamics
ISBN: 9780471152323
6th edition
Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen
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