TH10Ch10 - SIMPLE RANKINE CYCLE T 3 pump boiler 2 1 3...

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() 1 4 out 4 3 out 2 3 in 1 2 in shaft 2 h h m Q 0, W 1, 4 Process, Condenser h h m W 0, Q , 4 3 Process, Expansion h h m Q 0, W , 3 2 Process, Boiler h h m W 0, Q 2, 1 Process, Pump W ρ gh) 2 V pv (u m Q Processes for Equation Energy Flow Steady space in region - System Open Flow, Steady = = = = = = = = + + + + × = boiler condenser pump expander 1 2 3 4 1 2 3 4 T s SIMPLE RANKINE CYCLE in cycle in net cycle cycle cycle cycle cycle Q W Q W W Q δ W δ Q Cycles for Law First = = η = =
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= = + = + + + + = + = 1 2 1 2 1 2 1 1 2 2 2 2 ) ( ) 2 ( p p T T process isentropic pVmRT RT pv del IdealGasMo PROPERTIES W h m m u m u m Q ySystem Unsteadu W gz V pv u m Q OpenSystem W E emQ ClosedSyst LAW FIRST boundary o
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T s CARNOT CYCLE WITH WATER in Q net W η Q H T L T area maximum kJ/kg 740. W % 41.9 η C 240 T : at maximum W Q η W S T Q T T 1 η net Carnot net in net H in H L Carnot = = = × = = = 25 C 374.1 C
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1 2 3 4 T s 1 2 3 4 s 5 boiler condenser pump 1 2 3 4 boiler condenser pump 1 2 3 4 turbines 6 5 6 SUPERHEAT RANKINE CYCLE REHEAT RANKINE CYCLE
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() ( ) ( ) = = = = = + = + + = + = + = = = + = + = vdp h vdp dh 0 Tds Q process, adiabatic an for vdp dh Tds pdv vdp pdv dh Tds du, for ng subsitiuti vdp pdv du dh al differenti exact an is h , definition property h pv u h pdv du Tds dw, and dq for ng subsitiuti ork Boundary W pdv dw Law Second Tds dq dw du dq Law First W U Q ( ) m f m f m f 2 m 2 f 3 1 2 1 2 BTU/lb 044 . lb ft 778 BTU 1 lb lb ft 6 . 34 w fluid) of (ft , lb lb ft 6 . 34 ft 1 ft lb 62.4 ft lb 2160 w 62.4lb/ft 144psi/psf 15psia 30psia w p p v h h w = × = = = × = = = Example: water pumped
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This note was uploaded on 07/08/2011 for the course MAE 204 taught by Professor Errington during the Summer '08 term at SUNY Buffalo.

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TH10Ch10 - SIMPLE RANKINE CYCLE T 3 pump boiler 2 1 3...

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