By R. W. Haywood
Generally revised, up to date and increased, the fourth variation of this renowned textual content presents a rigorous analytical remedy of recent strength conversion plant. outstanding for either its theoretical and sensible therapy of traditional and nuclear strength plant, and its reports of refrigerating and gas-liquefaction plant. This fourth version now comprises fabric on issues of accelerating trouble within the fields of power 'saving' and relief of environmental toxins. This elevated insurance offers particularly with the next parts: CHP (cogeneration) plant, reviews of either gasoline and coal burning plant designed to lessen poisonous emissions, and the research of PWR plant within the nuclear undefined, which has been prolonged to hide conceptual designs geared toward larger inherent safeguard. With over 20 new sections plus new appendices and extra difficulties this article not just keeps its price but in addition complements its usefulness to the reader, overlaying components of present curiosity and value.
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Extra info for Analysis of Engineering Cycles. Power, Refrigerating and Gas Liquefaction Plant
0 p Irrev. Rev. 5) STEAM T U R B I N E PB = 2 M N / m ; t 2 b = 350 °C; p = 7 kN/m A Irrev. Rev. 7 T h e difference between the two types of plant in their respective sensitivities to inefficiency in the compression process is seen to b e most m a r k e d . It is this difference that accounted, in its early development, for the much greater difficulty in producing a successful gas-turbine plant, and which for long militated against the gas-turbine plant as an efficient prime-mover in the large-scale production of electrical power.
H e may also learn from a study of ^οττο something about the effect of change in design compression ratio o n the design performance of the actual engine. H e will see from e q n . 11) that increase in r will lead to an increase in 7 7 , and will correctly deduce from this that engines of higher compression ratio will also have a higher overall efficiency and lower specific fuel consumption. F o r a spark-ignition petrol engine the compression ratio is limited to a value b e t w e e n about 6 and 9, since higher values of r lead to detonation of the burning charge and consequent rough running.
5% Since the ideal work o u t p u t is - A G , t h e greatest possible value of t h e arbitrary overall efficiency η is as given in t h e last column of t h e table. T h e resulting anomalous situation of t h e ideal efficiency being in o n e case slightly in excess of 100% does n o t worry t h e engineer unduly, since, for reasons which will b e seen shortly, turbine and reciprocating plant have actual values of η always well below 1 0 0 % . F o r t h e fuel cell, however, which has a much closer approach t o complete reversibility a n d conse quently a very high efficiency at light current loadings, t h e engineer is b e t t e r advised t o use t h e rational efficiency / / in preference t o t h e arbitrary η .