Person: GÜMÜŞ, METİN
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GÜMÜŞ
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METİN
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Publication Metadata only Efficiency of an Otto engine under alternative power optimizations(JOHN WILEY & SONS LTD, 2009) GÜMÜŞ, METİN; Gumus, Metin; Atmaca, Mustafa; Yimaz, TamerThe proper optimization criterion to be chosen for the optimum design of the heat engines may differ depending on their purposes and working conditions. In this study, a comparative performance analysis is carried out for a reversible Otto cycle based on three alternative performance criteria namely maximum power (mp), maximum power density (mpd) and maximum efficient power (mep). The power density criterion is defined as the power per minimum specific volume in the cycle and the efficient power criterion is defined as multiplication of the power by the efficiency of the Otto cycle. Maximizing the efficient power gives a compromise between power and efficiency. Three different objective functions are defined and maximization of these functions is carried out under different design parameters of the Otto engine. The variations of power, power density and efficient power outputs are derived and presented with respect to the thermal efficiency of the cycle for various temperature ratios. It has been found that the design parameters at mep conditions lead to more efficient engines than that at the mp condition and the mep criterion may have a significant power advantage compared with mpd criterion. Copyright (C) 2009 John Wiley & Sons, Ltd.Publication Metadata only Optimization of Irreversible Cogeneration Systems under Alternative Performance Criteria(SPRINGER/PLENUM PUBLISHERS, 2009) İNAN, AHMET TALAT; Atmaca, M.; Gumus, M.; Inan, A. T.; Yilmaz, T.In this study, an exergy optimization has been performed for a cogeneration plant consisting of an irreversible Carnot heat engine. In the analysis, different objective functions have been defined based on alternative performance criteria and the optimum values of the design parameters of a cogeneration cycle were determined for different criteria. In this context, the effects of irreversibilities on the exergetic performance are investigated, and the results are discussed.Publication Metadata only Power and Efficiency Analysis of Diesel Cycle Under Alternative Criteria(SPRINGER HEIDELBERG, 2014) GÜMÜŞ, METİN; Atmaca, Mustafa; Gumus, MetinModel studies of the internal combustion engine cycles are useful for illustrating some important parameters affecting engine performance. The Diesel cycle is considered as a special case of an internal combustion engine. In the diesel cycle, combustion is controlled in order to obtain constant pressure at the beginning of the expansion stroke. It is important to choose the proper optimization criterion for the optimum design of the internal combustion engines. The choice of optimization criterion can be changed depending on the purpose of engine design and working conditions of the internal combustion engine. In this study, a comparative performance analysis is carried out for a reversible air standard Diesel cycle based on three alternative performance criteria, namely, maximum power (mp), maximum power density (mpd) and maximum efficient power (mep). The effects of the design parameters such as volume ratio and extreme temperature ratio of the cycle have been investigated under mp, mpd, mep and maximum efficiency conditions. The results show that the design parameters at mep conditions lead to more efficient engines than that at the mp conditions and that the mep criterion may have a significant power advantage compared to mpd criterion.