By R. W. Haywood
Commonly revised, up-to-date and increased, the fourth variation of this renowned textual content offers a rigorous analytical therapy of recent power conversion plant. striking for either its theoretical and useful remedy of traditional and nuclear energy plant, and its reviews of refrigerating and gas-liquefaction plant. This fourth variation now comprises fabric on subject matters of accelerating predicament within the fields of power 'saving' and relief of environmental pollutants. This elevated insurance bargains in particular with the subsequent components: CHP (cogeneration) plant, experiences of either gasoline and coal burning plant designed to minimize poisonous emissions, and the examine of PWR plant within the nuclear undefined, which has been prolonged to hide conceptual designs geared toward better inherent security. With over 20 new sections plus new appendices and extra difficulties this article not just keeps its price but additionally complements its usefulness to the reader, protecting components of present curiosity and significance.
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Additional info for Analysis of Engineering Cycles. Power, Refrigerating and Gas Liquefaction Plant
794. It is seen that the lost work due to the pressure d r o p between boiler and turbine is small compared with that due to inefficiency of the turbine. 8. Alternative expressions for Rankine cycle efficiency a n d efficiency ratio in t e r m s of available energy It has already been noted that, in practice, the exhaust steam entering the condenser is always wet. T h e steam is then condensed at constant t e m p e r a t u r e in the ideal condenser. In these circumstances an alternative expression for the exact R a n k i n e cycle efficiency may be written down from a study of availability.
10) with respect t o p , p W n e t is a m a x i m u m w h e n p = VAR. 14) p T h e variation of W with p is thus as shown in Fig. 5, in which o n e of the graphs shows W plotted non-dimensionally as net p net W net c (T p b - T) a against p . 8. Variation of i / Y w i t h p in t h e irreversible cycle C p It would b e possible, by differentiating with respect t o p t h e expression for ry given in Problem 3 . 3 , t o obtain a n analytical expression for t h e p CY Simple Closed-circuit Gas-turbine Plant 33 value of p at the point of m a x i m u m cycle efficiency, and thence deduce the value of that efficiency.
A b b a Simple Closed-circuit Gas-turbine Plant 29 Η α* F I G . 3 . 3 . Variation of cycle efficiency with ('« = 15 ° Q . isentropic temperature ratio impracticably large. Study of Fig. 2 also shows that as r approaches this figure the area enclosed by the cycle o n the t e m p e r a t u r e - e n t r o p y diagram tends towards zero. This m e a n s that the work o u t p u t p e r unit mass of air circulated tends to z e r o , so that the physical size of a plant designed for such a condition would also b e c o m e impracticably large.