Yazar "Polat, F." seçeneğine göre listele

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    An examinaion about thermal capacities of thermoelectric coolers in battery cooling systems
    (JERAS, 2017) Maral, Y.; Aktaş, M.; Erol, Oğuz; Ongun, Rıdvan; Polat, F.
    Peltier is a solid state active heat pump which can create a difference in temprature between two sides of the device by using electrical energy, the heater and the cooler sides of peltier is determined by the direction of direct current(DC) applied to the system. A Peltier consists of a P and a N type semi-conducting materials which are serial electrically and parallel thermally. The surfaces of the peltier are coated with ceramic which is thermally conductive but not electrically. Peltiers usually have low COP values which means the system requiers more energy compared to the conventional refrigeration cycle to dissipate same amount of heat energy. Advantages of peltier system are the system’s simplicity and being less prone to fault. In this study a series of experiments has been conducted and data has been collected for thermoelectric coolers systems which can be used for EV battery cooling. Through the experiments different current levels between 1 to 7 amps was applied to the system. Then coresponding voltage levels, temperature of water entering and exiting the system and surface temperatures of heater and cooler sides of the peltier were measured. All these measurements were after the system was stable and for a set period of time. The avarage of the measurements were used in calculations. It is observed that the thermal dissapation power of the system correlates with the amount of current that is drawed by the system.
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    Experimental and numerical investigation of pyrolysis of municipal solid waste with using computational fluid dynamics
    (TUBITAK, 2021) Polat, F.; Kilinçel, M.; Toklu, E.
    In this study, experiments have been carried out to investigate the effect of temperature on the final product yield of pyrolysis of municipal solid waste. Also, the rotary kiln is numerically modeled, mass, energy, and momentum equations are derived. At the same time, a finite element model was constructed for a pyrolysis reactor designed at three different aspect ratios. A total of 81 computational fluids dynamics analyzes were carried out by using different values for inlet temperature, particle size, and rotation speed with data from Kocaeli province environmental situation report' 2015. According to the analysis conditions, where the maximum methane gas yield is obtained, the energy potential that can be obtained from the municipal solid wastes was calculated. It has been observed that the experimental data overlaps with the analysis in terms of methane yield. © 2021, TUBITAK. All rights reserved.