SECOND LAW OF THERMODYNAMICS ThermodynamicsPowerPlantComponentsFigure 24 Expansion and Compression Processeson T-s DiagramFigure 25 Expansion and Compression Processeson h-s DiagramIn order to analyze a complete power plant steam power cycle, it is first necessary to analyze theelements which make up such cycles. (See Figure 26) Although specific designs differ, there arethree basic types of elements in power cycles, (1) turbines, (2) pumps and (3) heat exchangers.Associated with each of these three types of elements is a characteristic change in the propertiesof the working fluid.Previously we have calculatedFigure 26 Steam Cyclesystem efficiency by knowing thetemperature of the heat source andthe heat sink. It is also possible tocalculate the efficiencies of eachindividual component.The efficiency of each type ofcomponent can be calculated bycomparing the actual workproduced by the component to thework that would have beenproduced by an ideal componentoperating isentropically betweenthe same inlet and outletconditions.HT-01 Page 78 Rev. 0
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