isentropic efficiency

isentropic efficiency - Superheat Rankine Cycle Example Qin...

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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 superheat Rankine power cycle as we analyzed before. But this time we are going to look at the system at a more practical sense. As before, 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. However, both the turbine and the pump are operating at an isentropic efficiency of 80%. 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 2s 3 4s 4 2
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Discussion • Irreversibilities and losses are always associated with the operation of a real mechanical system. The existence of these unwanted effects is accompanied by an increase of entropy as required from the second law. (ex: 3 ! 4s isentropic process, 3 ! 4, entropy increases for a real process) • The efficiency of the turbine ( η t ) will decrease as a result of these losses: () s s
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isentropic efficiency - Superheat Rankine Cycle Example Qin...

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