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Analysis of Engineering Cycles by R. W. Haywood and W. A. Woods (Auth.)

By R. W. Haywood and W. A. Woods (Auth.)

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Example text

Thus, from eqns. 8), the efficiency ratio will be given by ™ . Efficiency ratio Actual η € Υ Actual Wnet = R—R—. ——;—— Ideal η Κ Α ΚΝ b^-bi Hence, from eqns. 11). Efficiency ratio = ( η κ ) steam circuit. 12) Thus, if we want to know the value of the efficiency ratio of the actual plant, it is evidently simpler to obtain this by calculating directly the rational efficiency of the open-circuit work-producing plant within control surface S of Fig. 3. The engineer should thus be encouraged, wherever possible, to apply the concepts of thermodynamic availability to a study of cyclic as well as non-cyclic plant and devices.

Introduction This chapter is principally concerned with performance parameters and criteria for reciprocating internal-combustion engines. 2 that an open-circuit gas-turbine plant is an internal-combustion device, and some reference to it will consequently be made here. 2 showed that the latter is a noncyclic open-circuit steady-flow work-producing device which does not operate on a thermodynamic cycle, so that it is not a cyclic heat power plant such as is depicted in Fig. 3(b). The same is true of a reciprocating internal-combustion engine, which is depicted diagrammatically in Fig.

The lost work due to irreversibility is thus equal to the product TA X [entropy increase of steam due to irreversibilities]. 5) If the condenser temperature TA is taken to be the same as the temperature To of the environment, this is a special case of a more general and important theorem in the study of availability which is discussed in Appendix A . 3. 1 and exhausts to the same 2 condenser pressure. 1 M N / m between boiler a n d turbine. Estimate the entropy increase between boiler and turbine, and the resulting reduction in the ideal turbine work output.

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