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# more rankine examples - Qin 2 boiler Win pump condenser 1...

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Superheat Rankine Cycle Example Turbine pump condenser 1 2 3 4 Q out Q in W out W in boiler Consider the same Rankine power cycle as we analyzed before. But this time we are going to superheat the steam in the boiler before allowing it to enter the turbine at 6 MPa. The steam exits from the turbine will be 100% saturated vapor as shown. After condensing, saturated liquid enters the pump at a pressure of 0.1 MPa. Determine (a) the rate of heat transfer into the boiler per unit mass, (b) the net power generation per unit mass. (c) the thermal efficiency, T s 1 2 3 4

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solution 4 44 (4) Let us analyze state 4 first, when the steam exits from the turbine 0.1( ), From saturated steam table C-2 s 7.3602( / ), 2675.5( / ) (1) Now look at the state 1 when the steam en gg PM P a s kJ kgK h h kJ kgK = == 11 3 1 ters the pump, again use C-2 s 1.3029( / ), 417.4( / ) 0.001043( / ) (2) From 1-2, the pump compressed the saturared liquid into compressed liquid The process is isentropic, s=const ff f s kJ kgK h h kJ kgK vv m k g 2 21 1 2 1 1 ant, therefore, from the Tds equation ,0 , , i n t Since the substance is compressed liquid, v=constant ( ) (0.001043)(6000 100) 6.15( / ) pump Tds dh vdP ds dh vdP egrate h h vdP h h vdP v P P kJ kg W hh =− = = = −= =
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## more rankine examples - Qin 2 boiler Win pump condenser 1...

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