Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . the indicator card on the p-v plane was and on the T-s plane the area was sq. in. These each reduce to for the area. The T-s plane for Fig. 83 has been turned through 90°.This is the conventional T-s diagram for the indicator card. THE STEAM ENGINE 193 It is now necessary to add other lines to the T-s diagram inorder to interpret it. Letters have been added to the diagramat critical points of Fig. 83. The diagram is for 1 lb. of totalsteam and this is the amou
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . the indicator card on the p-v plane was and on the T-s plane the area was sq. in. These each reduce to for the area. The T-s plane for Fig. 83 has been turned through 90°.This is the conventional T-s diagram for the indicator card. THE STEAM ENGINE 193 It is now necessary to add other lines to the T-s diagram inorder to interpret it. Letters have been added to the diagramat critical points of Fig. 83. The diagram is for 1 lb. of totalsteam and this is the amount present on be only hence the figure istrue only for this short line. From the point of admission / tob there is a changing weight of steam and from c to e there isa changing weight. The points on these lines are only drawnaccording to the actual volumes which are proportional to en-tropies because each is proportional to Mx. To study the line Moef on which M ,°M pounds are present, the line corresponding to zero entropy change must be drawn. If AC be drawn sothat M = QM E B M + Mc Zero Line fa I at ProperDistance Fig. 83.—T-S diagram of indicator card. then line AC would be the liquid line for the boiler steam only,while the distance CB or the distance between AC and ArB repre-sents entropy of the liquid for the clearance steam. The distance eF represents the entropy of the clearance steamat the beginning of compression and GH is laid off at this distancefrom CFA. This line would be the line of compression if the 13 194 HEAT ENGINEERING clearance steam did not change in entropy because the entropyof the liquid CB for this steam plus the entropy of vaporizationBH is constant. GH, although not an adiabatic on this figure,is the line of compression if the clearance steam were com-pressed without giving up heat. The line of compression isseen to pass to the left of the line GH which means that heat istaken up by the cylinder walls. The amount of heat is foundb
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