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Öğe Enhanced exergetic analysis of an olive oil refining plant: evaluation of the first and second level of exergy destructions(Inderscience Enterprises Ltd, 2019) Bozoglan, Elif; Erbay, Zafer; Hepbasli, Arif; Gunerhan, HuseyinEnhanced exergy analysis is built up as a novel modality to specify the origins of irreversibilities and to concentrate substantial improvement potential of components. The scope of this paper is to apply the enhanced exergy analysis to an olive oil refinery plant operated in Izmir, Turkey, that is conducted for the first time to agree the first level (endogenous/exogenous) and the second level (combination of the endogenous/exogenous and unavoidable/avoidable parts studied before) of destructions for exposing substantial efficiencies. Results showed that the components in the plant mostly have endogenous exergy destructions. Besides, the distillation unit has the highest endogenous exergy destruction value of 150.9 kW as the avoidable and unavoidable endogenous sections are 76.85 and 74.08 kW, respectively. Furthermore, the shell and tube economiser has the highest modified (enhanced) exergetic efficiency of 99.9% while the modified performances of plate-heat exchanger and pump (VII) are calculated as 73% and 71.24%, respectively.Öğe Exergetic performance of building attached photovoltaic power plant: a case study for an olive oil production corporation(Inderscience Enterprises Ltd, 2019) Bozoglan, Elif; Cubukcu, Mete; Saglam, Eylem; Ogutcen, A. EvrenIt is known that solar energy is among the most available and sustainable renewable sources of energy. This study utilised energy and exergy analyses to assess the performance of a building attached photovoltaic (BAPV) plant. The grid connected BAPV plant installed on the roof of an olive oil production company situated in Izmir, Turkey with a capacity of 701.2 kWp. Strings having a total of 21 monocrystalline solar modules constitute the BAPV system. In 2017, the plant was found to have an exergy efficiency around 12.49-15.76% while it was discovered that the sustainability indexes of the BAPV plant were in the region of 1.14-1.19. The module plane and the electricity produced, recorded annual solar irradiation of 1,561.32 kWh/(m(2)y) and 878.29 MWh/y, respectively. As a result of the values, this study recorded a mean annual electricity specific yield of 1,252.55 kWh/kWp and performance ratio of 81.86%.Öğe Performance improvements for olive oil refining plants(Wiley, 2010) Bozoglan, Elif; Hepbasli, ArifThe main objective of this study, which is conducted for the first time to the best of the authors' knowledge, is to identify improvements in olive oil refinery plants' performance. In the analyses, the actual operational data are used for performance assessment purposes. The refinery plant investigated is located in Izmir Turkey and has an oil capacity of 6250 kg h. It basically incorporates steam generators, several tanks, heat exchangers, a distillation column, flash tanks and several pumps. The values for exergy efficiency and exergy destruction of operating components are determined based on a reference (dead state) temperature of 25 C. An Engineering Equation Solver (EES) software program is utilized to do the analyses of the plant. The exergy transports between the components and the consumptions in each of the components of the whole plant are determined for the average parameters obtained from the actual data. The exergy loss and flow diagram (the so-called Grassmann diagram) are also presented for the entire plant studied to give quantitative information regarding the proportion of the exergy input that is dissipated in the various plant components. Among the observed components in the plant, the most efficient equipment is found to be the shell- and tube-type heat exchanger with an exergy efficiency value of 85%. The overall exergetic efficiency performance of the plant (the so-called functional exergy efficiency) is obtained to be about 12%, while the exergy efficiency value on the exergetic fuel product basis is calculated to be about 65%. Copyright (C) 2009 John Wiley & Sons, Ltd.Öğe Splitting the exergy destructions of an olive oil refining plant into avoidable and unavoidable parts based on actual operational data(Inderscience Enterprises Ltd, 2016) Bozoglan, Elif; Erbay, Zafer; Hepbasli, Arif; Gunerhan, HuseyinThis study focused on assessing the performance of an olive oil refinery plant (with an oil capacity of 5595 kg/h) located in Izmir, Turkey. The analysis was performed with the use of actual operational data of the system components while an advanced exergy analysis method was used. By this way, unavoidable and avoidable destructions of olive oil refinery plant components were obtained. The results indicated that the greater part of the exergy destructions detected in the system were avoidable and could be minimised by improvements in the design. The highest exergy destruction rate (217.96 kW) was determined owing to the distillation unit of the system with a markedly high unavoidable exergy destruction ratio of 50.92%. In addition, the efficiencies of the components in the plant varied from 5.67% to 90.7% while their corresponding modified exergetic efficiencies were in the range of 8.74% and 92.48%.Öğe Sustainable assessment of solar hydrogen production techniques(Pergamon-Elsevier Science Ltd, 2012) Bozoglan, Elif; Midilli, Adnan; Hepbasli, ArifThis study addresses some technical issues related to solar hydrogen production methods. In this regard, exergy-based environmental and sustainability parameters are applied to an electrolysis process for hydrogen production. Accordingly, the environmental destruction index is found to be 0.16 while exergetic benign index is calculated as 6.30. While the exergy efficiency increases from 10 to 90%, the sustainability index rises from 0.01 to 8.1. Thus, solar hydrogen production should be used for practical applications because of higher exergetic sustainability potential and lower environmental destruction index. (C) 2012 Elsevier Ltd. All rights reserved.
