Yazar "Yilmaz, S." seçeneğine göre listele

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    Design of a universal thermoelectric module test system for testing rat brain thermoelectric hypothermia
    (Inst Engineering Technology-Iet, 2007) Demirel, H.; Ciylan, B.; Erkal, B.; Yilmaz, S.
    A universal microcontroller test system, which aims to determine the parameters of thermoelectric modules under various thermal loads, has been designed and realised using a novel test method. The test system has been designed according to a more simplified form of the present formula set, which has been made to accept minimum variables as the input in order to obtain more precise results. It measures all the parameters of a working thermoelectric module by measuring only the hot-side temperature, module operation voltage, current and thermal voltage values of the module. The new test system has been used to measure a standard thermoelectric module (Melcor CP 1.4-127-10L) in order to verify its performance. It has also been used to test the operation of an experimental medical apparatus, which is used to induce hypothermia (low body temperature) in the brains of rats using a thermoelectric module.
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    Energy analysis of concentrated photovoltaic/thermal panels with nanofluids
    (International Journal of Thermodynamics, 2021) Dumrul, H.; Yilmaz, S.; Kaya, M.; Ceylan, I.
    In this study, a prototype system was established for location heating application and electricity generation through utilizing two concentrated photovoltaic thermal panels (CPV/T) possessing flat surface receivers connected in series with each other. The purpose of the system is to supply the heating needs of a room in winter season and to meet the electricity requirement of the equipment used in this system. In the analysis of the installed system, different refrigerants (10% mono propylene glycol + 90% water and 0.5% Al2O3-water nanofluid) were tested at three different flow rates (0.4 m3/h, 0.5 m3/h, 0.6 m3/h). Throughout the experiments, the fan-coil air outlet temperature used to heat the room was adjusted to 35 °C with an inverter and a process control device. The results attained from the experiments carried out using different fluids throughout different months and days (April-May) have demonstrated that the thermal and electrical efficiencies of the system are found to be in good agreement with each other when evaluated in terms of the fluids utilized. The highest electrical energy recovery was found as 268 W at 0.6 m3/h flow rate for propylene glycol-water mixture and 194 W at 0.5 m3/h flow rate for nanomixture. The total thermal energy efficiency for the system using different fluids was found to be around 22%. The total thermal energy gain of the system was also calculated as 2312 W at 0.6 m3/h for the propylene glycol mixture and 2041 W at 0.5 m3/h for the nanomixture. © 2021 International Journal of Thermodynamics. All rights reserved.
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    Taguchi method based evaluation of process parameters effects on system performance in the computer controlled cold-hot therapy device with thermoelectric module
    (2012) Yavuz, C.; Sarikaya, M.; Yilmaz, S.; Kaya, M.
    This paper deals with an investigation of the effect and optimization of control parameters on the system performance in the computer controlled cold-hot therapy device with thermoelectric module. The experimental studies have been performed under varying water flow rate, operating voltage and ambient temperature using design of experiment. The experiments have been planned based on Taguchi's L18 orthogonal array with each trial performed under different conditions of water flow rate, operating voltage and ambient temperature. The optimum parameter combination has been obtained by using the analysis of signal-to-noise (S/N) ratio. The level of importance of the control parameters on the system performance has been determined by using analysis of variance (ANOVA). Main effect's plots have been utilized to optimize and analyze the relation between the control parameters and the system performance. In addition, regression analysis was applied to determine mathematical equations that indicate the relation between response and control factors. As a result of measured experimental values performed using the Taguchi orthogonal array. It was found that the operating voltage was the most significant factor affecting the surface temperature and temperature difference. The number of experiments in the same or similar area in heat transfer were reduced by using the Taguchi experimental design to define optimum points. Sufficient results were obtained so that they may be used in future academic and industrial researches. © Sila Science.