ME300Lecture34

ME300Lecture34 - Lecture 34: Rankine Cycle with...

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34.1 Lecture 34: Rankine Cycle with Regeneration Recall Basic Rankine Cycle: T p 1 = p 4 p 2 = p 3 1 4s 3 T L T C T B T H 4 ∆T HX ∆T HX 2s s To improve efficiency: 1.) Raise average temperature for heat addition 2.) Lower average temperature for heat rejection Rankine Cycle Improvements: 1.) Reheat: allows increased T B , while maintaining x 4 > 0.95 2.) Regeneration: reduce the external heat added from 2 2’ 2 2’
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34.2 Continue Rankine Cycle Improvements Regeneration: » There are two types of regeneration cycles: 1.) open feedwater heating 2.) closed feedwater heating Rankine Cycle with open feedwater heater: 5 6 7 1 st -stage 2 nd -stage 1 2 3 4 Turbines . W P2 . W T . W P1 . Q C Boiler Condenser Pump 1 Pump 2 Open Feed- water heater . Q B . m tot . y m tot . (1-y) m tot
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34.3 Continue Rankine Cycle Improvements Continue Rankine Cycle with open feedwater heater: T p 1 = p 7 1 T L T C T B T H 4 s 2 3 p 4 = p 5 p 2 = p 3 = p 6 5 7 6 6s 7s Notes: - Choose y so that state 3 is saturated liquid - Tradeoff: Heat addition from 2 5 is reduced by (h
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ME300Lecture34 - Lecture 34: Rankine Cycle with...

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