lecture26 - Thermal power plant efficiency Efficiency...

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ENGRI 1290 1 Thermal power plant efficiency Efficiency maximization Power plant efficiencies New generation plant efficiencies
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ENGRI 1290 2 Two ways to increase the thermal efficiency hot what I get W e what I put in Q  The thermal efficiency is For a cycle this can be written as cold hot Q e1 - Q To increase the efficiency there are only two ways: 1- Reduce Δ h cold : this is achieved in combined cycle power plants 2- Increase Δ h hot : this is achieved in advanced power plants This involves using some of the heat left from the main cycle inside a secondary cycle to produce more work. This involves higher pressures and temperatures. cold cold hot hot Qh For a purely thermal cycle
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ENGRI 1290 3 Carnot Cycle and efficiency P (Pa) V (m 3 ) T hot T cold Q hot Q cold 1 2 3 4 Q hot 1 2 Q cold 3 4 The Carnot cycle is the most efficient thermodynamics cycle. For any cycle cold hot Q e1 - Q But for the Carnot cycle cold cold hot hot QT cold Carnot hot T - T
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ENGRI 1290 4
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This note was uploaded on 09/14/2011 for the course ENGRI 1290 taught by Professor Gourdain during the Fall '10 term at Cornell University (Engineering School).

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lecture26 - Thermal power plant efficiency Efficiency...

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