Browsing by Author "Akgul M.B."

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    Magnetic-Thermal Analysis and Rapid Consolidation of FE–3 wt.% CU Powder Metal Compacts Sintered by Medium-Frequency Induction-Heated System
    (Springer Science and Business Media, LLC, 2014) Cavdar U.; Atik E.; Akgul M.B.
    In this paper, the results of numerical and experimental studies concerning the effect of mediumfrequency induction sintering of Fe–3 wt.% Cu powder metal (PM) compacts are discussed. Several sintering durations from 30 to 180 sec are studied. The mixed powders are compacted at 600 MPa and sintered by medium-frequency induction system (30–50 kHz frequency and 12 kW power). Magnetic and thermal analysis, mechanical properties, and densities of copper–iron PM compacts are presented. © 2014, Springer Science+Business Media New York.
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    A numerical analysis of thermal management schemes of a LED array in TFT TV
    (Institute of Electrical and Electronics Engineers Inc., 2014) Mermer O.; Nil M.; Akgul M.B.
    This paper aims to perform the numerical analysis and to investigate thermal characteristics of the LED backlight TFT TV according to thermal design parameters. Natural convective cooling of a LED array system used TFT TV is considered in this study. Numerical computations are carried out for horizontal and vertical orientations of the LED array. The effects of the PCB materials on the temperature distribution are discussed in detail. It is found that the maximum temperature of the LED packages significantly decreases by the horizontal orientation of the LED array in TFT based television. In addition, ceramic based PCB materials having high thermal conductivity such as A1N present better thermal performance than that of metal based PCB materials. © 2014 IEEE.
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    A new experimentally developed integrated organic Rankine cycle plant
    (Elsevier Ltd, 2021) Sorgulu F.; Akgul M.B.; Cebeci E.; Yilmaz T.O.; Dincer I.
    In this study, an organic Rankine cycle (ORC) integrated with a combustion subsystem and a horizontal belt-type drying unit is developed, built, and tested at a pilot scale for organic wastes to energy applications. The organic wastes used for experimental investigation are chicken manure collected from the respective food sector. A novel drying unit is also employed to dry out the chicken manure to the desired moisture level for more efficient and effective combustion. The heat generated is further supplied to the ORC for power generation. Finally, the heat rejected from ORC is used for chicken manure drying purposes. This way, the ORC generates two useful commodities like electricity and heat. An amount of 400 ton/day chicken manure from almost 4 million chickens is burned to obtain heat. The heat obtained from the combustor is utilized in an organic Rankine cycle with a capacity of 2.3 MW net power. The integrated ORC system is analyzed comprehensively through energy and exergy approaches, and its environmental impact assessment is performed. A detailed efficiency evaluation is carried out by considering energy and exergy efficiency approaches. The overall energy and exergy efficiencies of the integrated system are determined as 29.45% and 28.05%, respectively. For the ORC specifically, the energy and exergy efficiencies are calculated as 90.58% and 62.60% by considering the cycle as a cogeneration unit. © 2021 Elsevier Ltd