Yazar "Soylemez, Mehmet Sait" seçeneğine göre listele

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    A NOVEL THERMAL ANALYSIS FOR COOKING PROCESS IN BULGUR PRODUCTION: DESIGN CONSIDERATIONS, ENERGY EFFICIENCY AND WASTEWATER DIMINUTION FOR INDUSTRIAL PROCESSES
    (Turkish Soc Thermal Sciences Technology, 2020) Yilmaz, Ibrahim Halil; Soylemez, Mehmet Sait
    The main contribution of this study is to present a novel thermal model for analyzing the wheat cooking process and to propose a design procedure for an energy-efficient cooking pot. A small-scale cooking pot was designed and an experimental setup was installed to verify the model under various operating conditions. The developed model was solved using the Engineering Equation Solver software. Results were compared with those of the experiments and good agreement was obtained. Additionally, a computational fluid dynamics model was developed to verify the thermal model and have a useful design tool for large-scale cooking pots. It was found that the energy efficiency of the cooking process can be enhanced by initiating nucleate boiling (at similar to 5 degrees C minimum temperature difference between the heating element surface and saturation) which will supply the minimum heat flux on the helicoidal heat exchanger of the cooking pot. Lessening the energy demand but preserving the final product quality has decreased the 5-day biological oxygen demand of wastewater at least 50%. It is proposed that the wheat to water ratio can be reduced to 1.0-1.2 once the energy optimization and water recovery practices are satisfied. The estimated average specific energy consumption rate lies between 400.475 +/- 5% W/kg (thermal power supplied for one kilogram of wheat) which can be reduced similar to 25% further by reducing the wheat to water ratio to 1.0. The results reported in the present study are expected to guide thermal and food engineers for the design applications of industrial cooking pots, energy optimization with less harmful wastewater and process control strategies for cooking of wheat.
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    Experimental analysis and dynamic simulation of a solar-assisted industrial process using parabolic trough solar collectors under outdoor conditions
    (Elsevier, 2023) Yilmaz, Ibrahim Halil; Soylemez, Mehmet Sait; Yumrutas, Recep
    Solar heat for industrial processes has gathered much attention and technological vision over time due to energy savings and environmental concerns even though there are various restrictions and complications in integrating solar collector technologies with industry. This study aims to cut thermal energy consumption and anthropogenic gas emissions in bulgur industry by proposing a novel experimental design for a solar-assisted process heat (SAPH) system. An experimental method has been addressed for the food treatment process integrated with parabolic trough solar collectors (PTSCs) and the proposed dynamic model of the system has been simulated for predicting the annual performance. The performance parameters of the individual system components have been analyzed during the days of the experiments conducted. Operational experience gained from the application reveals that the overall system efficiency depends keenly on the collector efficiency of the PTSCs used, load characteristics, and operating conditions. Furthermore, selecting an appropriate size for all heat-exchange devices is a critical parameter to improve the overall efficiency significantly and avert long-term temperature fluctuations. The long-term simulation results reveal that the annual efficiency can be obtained as 20.8 % for the SAPH system and further improved with system optimization.
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    PERFORMANCE TESTING OF A PARABOLIC TROUGH COLLECTOR ARRAY FOR A SMALL-SCALE PROCESS HEAT APPLICATION
    (Turkish Soc Thermal Sciences Technology, 2018) Yilmaz, Ibrahim Halil; Hayta, Hakan; Yumrutas, Recep; Soylemez, Mehmet Sait
    This study presents the experimental investigation on performance testing of a parabolic trough solar collector (PTSC) array consisting of three modules connected in series. A new test setup has been proposed to test the thermal performance of this PTSC array in compliance with ASHRAE 93-1986 standard. The experimental tests have been carried out and monitored in a number of days under cloudless sky conditions in Gaziantep. In the performance analyses, the effects of beam radiation, collector inlet temperature, ambient conditions, and the variation in mass flow rate of the working fluid were investigated. The steady-state and dynamic tests of the PTSC array were performed. The efficiency tests were conducted with thermal oil for the temperature range from 50 degrees C to 200 degrees C, and mass flow rate of 0.1 kg/s to 0.5 kg/s under steady conditions. Additionally, the experimental results were compared with the results of the theoretical study made previously and gave good coherency.
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    Pilot-scale hydrogen generation from the hydrolysis of black aluminum dross without any catalyst
    (Elsevier Sci Ltd, 2022) Kale, Mehmet; Yilmaz, Ibrahim Halil; Kaya, Abdulaziz; Cetin, Ali Emrah; Soylemez, Mehmet Sait
    This study presents a sustainable method for the production of hydrogen gas without adding any catalyst from the hydrolysis of black Al dross. A pilot-scale experimental setup consisting of a reactor, a condenser, and control and measurement devices was constructed to perform chemical reactions and physical measurements. The dross used in experiments was not activated by any process and can be found in facilities (Al production plants or die casting factories) with a grain size lower than 400 mu m. The chemical composition revealed by XRF showed that the black dross contained 41.96% Al. Major and minor crystalline phases present in the sample were detected by XRD. A set of experiments was performed to investigate the effects of gravimetric dross to water ratio, pH value, initial water temperature, the pressure of the reaction mixture in time for H-2 synthesis. 120 L of gas were maximally produced after reacting 1 kg of Al dross with 2 kg of hot tap water at 100 degrees C. The H-2 purity of the gas mixture and the calorific value of the mixture were respectively measured by gas chromatography and gas calorimeter as 93.24% and 2375 kcal/m(3). After hydrolysis of the Al dross, XRD, SEM, and EDX analyses revealed the formation of hydrolysis products and their morphology. This showed that the resultant mixture tends to become harmless and can be used for various fields of the industry as a by-product.