. The steam-engine and other heat-motors. >» Line of Zero PressureFig. Pressure . s- boiler r %{.. „H. CWis determined in the same wayas BS in Fig. 31a. Line of Condenser Pressure Fig. Factor . JJ ^ Line of Zero Pressure 84 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. Elimination of Clearance Steam.—RS or CN measures thenet steam that passes through the cycle. We shall find that anentropy diagram measures the heat added; that is, the heat offormation of the admission steam measured above its properfeed-water temperature. It is then necessary to eliminate theclearance steam f
. The steam-engine and other heat-motors. >» Line of Zero PressureFig. Pressure . s- boiler r %{.. „H. CWis determined in the same wayas BS in Fig. 31a. Line of Condenser Pressure Fig. Factor . JJ ^ Line of Zero Pressure 84 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. Elimination of Clearance Steam.—RS or CN measures thenet steam that passes through the cycle. We shall find that anentropy diagram measures the heat added; that is, the heat offormation of the admission steam measured above its properfeed-water temperature. It is then necessary to eliminate theclearance steam from the diagram. Figs. 51 and 52 show howthis is done. It is important to note that the diagram factor is based on anideal diagram the back-pressure line of which is neither the zeroline nor the expected back-pressure line, but an ideal line of backpressure. The ideal back-pressure line for a condensing engine isthe assumed pressure in the condenser and in a non-condensingengine it is the atmospheric pressure. Compressing the steam toboiler pressure is in effect avoiding the complication of consider-ing clea
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