SECOND LAW OF THERMODYNAMICS ThermodynamicsIt is sometimes useful to plot on the Mollier diagram the processes that occur during the cycle.This is done on Figure 38. The numbered points on Figure 38 correspond to the numbered pointson Figures 35 and 36. Because the Mollier diagram is a plot of the conditions existing for waterin vapor form, the portions of the plot which fall into the region of liquid water do not show upon the Mollier diagram. The following conditions were used in plotting the curves on Figure 38.Point 1: Saturated steam at 540oFPoint 2: 82.5% quality at exit of HP turbinePoint 3: Temperature of superheated steam is 440oFPoint 4: Condenser vacuum is 1 psiaThe solid lines on Figure 38 represent the conditions for a cycle which uses ideal turbines asverified by the fact that no entropy change is shown across the turbines. The dotted lines onFigure 38 represent the path taken if real turbines were considered, in which case an increase inentropy is evident.HT-01 Page 94 Rev. 0
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