By Mehmet Kanoğlu, Yunus A. Çengel, Ibrahim DinCer
Efficiency is likely one of the most often used phrases in thermodynamics, and it shows how good an power conversion or procedure is finished. potency can also be some of the most usually misused phrases in thermodynamics and is usually a resource of confusion. the reason is, potency is frequently used with no being safely outlined first. This e-book intends to supply a accomplished review of varied efficiencies used for strength move and conversion platforms together with steady-flow power units (turbines, compressors, pumps, nozzles, warmth exchangers, etc.), numerous energy crops, cogeneration vegetation, and refrigeration structures. The e-book will hide first-law (energy established) and second-law (exergy dependent) efficiencies and supply a accomplished figuring out in their implications. it is going to support reduce the common misuse of efficiencies between scholars and researchers in power box through the use of an intuitive and unified technique for outlining efficiencies. The ebook should be really worthwhile for a transparent realizing of moment legislation (exergy) efficiencies for varied platforms. it could function a reference booklet to the researchers in strength box. The definitions and ideas built within the booklet can be defined via illustrative examples.
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Extra info for Efficiency Evaluation of Energy Systems
Things are complicated even further when the cold fluid stream is below the environment temperature and the hot fluid stream is above so that the exergy of both fluid streams decreases during heat exchange. When we deal with fluid streams above the environment temperature T0, which is most often the case in practice, the cold fluid stream experiences an increase in its exergy content and none of the exergy of the incoming cold stream is expended. Therefore, we believe only the hot fluid stream should be considered as the exergy source in such cases, and the exergy increase of the cold fluid stream represents the exergy recovered.
It is the shaft work input in the case of a compressor, and the decrease 30 3 Energy and Exergy Efficiencies in the exergy of steam (difference between exergy values at inlet and outlet) in the case of a steam turbine. Exergy recovered is the portion of the expended exergy that is retained as exergy, the portion that is saved from destruction within the system during the process. 11) may be used to find the exergy efficiency of a system. In this book, we provide exergy efficiency formulations based on both approaches.
A power input is needed for this compression process. The performance of an adiabatic compressor is usually expressed by isentropic (adiabatic) efficiency. Consider an adiabatic compressor with inlet state 1 and an exit state 2. , isentropically) between the given initial state and given exit pressure. 31) where m_ is the mass flow rate of the gas and hs is the enthalpy of the fluid at the compressor outlet if the process were isentropic. This enthalpy may be obtained from exit pressure and exit entropy (equal to inlet entropy).