Enerji Teknolojileri Uygulama ve Araştırma Merkezi

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https://hdl.handle.net/11501/1574

Listeleniyor 1 - 12 / 12

Energy efficiency analysis with data obtained from aluminum melting factory
(TESPAM, 2025) Şengül, Azat Yakup; Canci Matur, Utku
In the Industry 4.0 revolution, which first emerged in Germany, the primary goal has been to increase production efficiency using Internet of Things (IoT) technology. Industry 4.0 is positioned to serve as a bridge in the triangle of people, processes, and technology. Here, the human is referred to as the user, the process as the organizational structure, and technology as software and hardware. The "Automation Pyramid," which has come to the forefront with Industry 4.0, has been defined as the general framework for establishing these bridges. With the increased product variety brought by Industry 4.0, the energy consumed in production facilities has also started to show upward variability. At the same time, rising unit energy costs have encouraged factories to work on energy efficiency. Industry 4.0 aims to digitize factories. With this digitalization, data (production data, energy data) is collected from the production site independently of human statements. The data obtained not only guide factory improvement efforts but also enable the creation of plans for the efficient use of energy in production work orders. In this study, the change over the years in the impact of improvement efforts on energy efficiency in a factory where data was collected from the production site has been evaluated.
A novel natural fibers-based bio-composite prepared from silk fibroin and luffa cylindrica
(Springer, 2025) Akay Sefer, Özge; Konuk Ege, Gözde; Saltık, Derya; Yüce, Hüseyin
Herein, the novel bio-based co-polymer was synthesized using only natural fibers by way of co-dissolving cellulose extracted from Luffa Cylindrica (LC) and silk fibroin (SF) in formic acid in different weight ratios (3SF/1LC, 2SF/2LC, and 1SF/3LC). The prepared bio-composite films were investigated by morphological, vibrational, structural, thermally, and wettability with Scanning electron microscope (SEM), Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction spectroscopy (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and water contact angle (WCA). The surface and cross-section SEM images of samples indicate that all films have homogeneous structures, and by varying the ratio of silk fibroin in blend films, a smoother and glassier appearance was obtained, as also proved by XRD and DSC results. The results of the FT-IR test reveal that the changing and shifting of peak intensities in the spectroscopy of bio-composite films indicate interactions between luffa cellulose and silk fibroins. XRD results show that silk fibroin enhances the crystallinity of bio-composite specimens. In addition, thermogravimetric analysis demonstrates that increasing the cellulose ratio in bio-composite films extends their thermal stability. The glass transition value provided by the DSC test proves that the flexibility of hybrid bio-composite films increases as the ratio of luffa increases. As a final analysis, WCA states that when blended with luffa and silk fibroin, although both are hydrophilic, the hybrid bio-composite films display hydrophobic properties, and LC increase enhances this behavior against water. The combination of these two materials can be used in environmentally friendly in medical applications (tissue engineering, wound dressings, etc.) and agricultural fields.
Thermal management analysis with different PCMs in Sodium-Ion batteries
(Türkiye Enerji Stratejileri ve Politikaları Araştırma Merkezi (TESPAM), 2024) Canci Matur, Utku; Tüysüz, Cansu; Köse, Ali
The advent of modern technology has led to a significant increase in the utilisation of rechargeable secondary batteries. Despite the sustainability of lithium-ion (Li-ion) batteries, the limited availability of lithium has driven research into alternative energy storage technologies. Sodium-ion (Na-ion) batteries, as a potential alternative to Li-ion batteries, have emerged as a highly promising contender. However, for these batteries to become industrially viable, certain properties such as energy and power density need to be enhanced. To address this issue, batteries have been a focus of research, and battery thermal management systems have been developed. These systems aim to evaluate battery performance, which is strongly influenced by temperature. Effective thermal management ensures that the battery operates within the optimal temperature range. This study models a pouch-type battery and evaluates the effects of phase changing materials (PCM) on battery temperature control. Comparative analysis is conducted using different PCMs to understand their impact. The study analyses the battery's response to specific temperature ranges and assesses how different PCMs affect battery cooling performance. The results provide critical insights for ensuring efficient battery operation. Furthermore, this research supports the broader adoption of Na-ion batteries in industrial applications and contributes to the development of sustainable energy storage systems.
Dielectric and optical properties of Eux(Bi1-x)Sr2CaCu2O6.5 (x=0.3 and 1) samples
(Istanbul Gedik University, 2024) Canci Matur, Utku; Aslan Çataltepe, Özden; Tabanlı, Sevcan
Eu-based copper oxide layered ceramics have some interesting dielectric properties depending on its stoichiometric ratios and elements used in ceramics. In this study, optical properties of EuSr2CaCu2O6.5 and Eu0.3Bi0.7Sr2CaCu2O6.5 samples and dielectric property of EuSr2CaCu2O6.5 sample were investigated for the first time. Negative real permittivity for EuSr2CaCu2O6+x sample was observed at temperature with 373 K and higher temperatures and below than the cross over frequency with 14 Hz. Moreover, it is determined that Eu3+ concentration in the material affects the relative emission intensity.
Design today save future
(Istanbul Gedik University, 2019) Yahya, Noorhana; Pereira, Carlos Mourão; Canci Matur, Utku; Özbudak, Özgün; Önal, Feride; Tolon, Mart; Karabuga, Arif
Along with the development of technology, industrialization and rapid population growth have increased the energy demand. The awareness of the energy crisis has led researchers to search for new solutions and use new technologies in this area. Renewable energy has an extremely important place in energy requirement of the countries with domestic resources, reducing the external dependency, diversifying the resources and ensuring sustainable energy usage and minimizing the damages to the environment as a result of energy consumption. Today, around 20 percent of the world’s consumed energy is supply from renewable sources. Despite the high level of dependence on fossil fuels in the current situation, the use of renewable energy has been increasing steadily over the years. The conventional energy sources that already supply most of the energy demand. However, it is estimated that fossil fuels, especially petroleum, will be consumed in the next 200-300 years. In order to be able to produce solutions for this situation, it is necessary to carry out many research/development and production/development projects related to both conventional energy sources and alternative energy sources.
Examination of the liquefaction system for the use of different cryogenics in terms of thermodynamic analysis
(Inderscience Enterprises Ltd, 2019) Karabuğa, Arif; Utlu, Zafer; Selbaş, Reşat
Energy consumption in the world is increasing day by day. In addition to diversifying energy resources, it is also important to reduce energy consumption. In order to find the actual consumption of a thermodynamic system, energy efficiency as well as exergy efficiency should be done. The purpose of this study is to determine the parameters affecting the exergy efficiency of the cryogenic liquefaction unit integrated into a real cryogenic air separation unit. Cryogenic liquefaction is one of the basic processes between liquefaction methods. In addition to this process, absorption and membrane are used in methods. The main difference in the selection of these methods is the desired purity rates. Cryogenes are defined as fluids used in cryogenic cooling. In this study, five different cryogenes in the air are investigated. The energy and exergy analysis of the liquefaction unit for each cryogen is made. As a result of the study, the highest COPactual value is obtained with 0.3105 hydrogen fluid and the highest COPrev value with 0.8551 oxygen. Exergy of the system is found as 0.48 with hydrogen.
Thermal neutrons effect on improvement of electrical properties at CIGS thin film derived by sol-gel dip coating technique
(Elsevier, 2022) Canci Matur, Utku; Baydoğan, Nilgün
The thermal neutron effect on the copper indium gallium (di)selenide thin film synthesized by the sol-gel dip -coating technique has explained the novel use of this film under extreme conditions (such as neutron irradiation fields). The thin film samples were treated by using the reactor neutrons to obtain the optimum neutron treat-ment for the determination of the variations in the structural characteristics. The gamma filter system has provided the evaluation of the high thermal neutron flux effect on the thin film samples by using the tangential beam tube of ITU TRIGA Mark-II reactor. The influence of the neutron effect on the electrical and optical features was explained by the rise of selenium amount in the thin film. The neutron-treated thin film samples (at 50 at. % Se) had a significant effect on the lowest electrical resistivity depending on the increase of the film density. The equivalent gamma dose of the neutron-treated thin film was determined as a 0.024 Gy dose level for neutron irradiation. The neutron treatment was significant to evaluate the decrease in the sheet resistivity of the thin film at this dose level. The neutron dose has led to a slight decrease in the optical band gap as the result of the thermal and epithermal neutrons' effects on the thin film.
Effect of electron beam improved dielectric function on optical properties of sol-gel derived CuIn1-XGaXSe2 thin-film
(Elsevier, 2022) Voss, S. Akyol; Canci Matur, Utku; Çimenoğlu, Hüseyin; Baydoğan, Nilgün
Electron beam has been applied as a practical posttreatment process for the surface modification at the CuIn1-XGaXSe2 thin film. The rise of the film thickness indicated the advantages of the modified surface-related properties (such as the optical parameters to develop an optimum optical model) via enriching the micro-structure with the negative charged beta particles by using Sr-90 radioisotope. The effect of negatively charged beta particles on dielectric constants was examined at two different dose levels (3 and 9.1 Gy) by using Sr-90 radioisotope. The application of the electron beam to the thin film surface caused the slight changes in refrac-tive index (n), extinction coefficient (k) and optical absorption coefficient. The increase of refractive index and the improvement of absorption coefficient provided to distinguish clearly the decrease in extinction coefficient and the decline in energy band gap as the result of the rise of the beta dose at the thin-film. The slight variations in dielectric constants were performed by encouraging more dense structure to form the optimum crystalline network at the thin film (applied beta dose). The application of beta dose favoured inventive variations in the refractive index. The applied two different beta dose levels were below-3.1 Gy and above-9 Gy. The beta dose level at-9 Gy was-3 times dose value of 3.1 Gy (applied as a security value for the utilization of this thin film at the extreme environments such as international space station orbit). The refractive index stated its importance specifying the rise of the bending of light in the thin film structure.
Swelling modification by electron beam at chalcopyrite copper indium gallium diselenium thin-film controlled optical features
(Elsevier, 2023) Voss, S. Akyol; Canci Matur, Utku; Çimenoğlu, Hüseyin; Baydoğan, Nilgün
Electron beam effect on swelling at the sol-gel derived thin film has been examined for chalcopyrite copper indium gallium diselenium thin-film semiconductor nanolayers with optical pransparent features. The copper indium gallium diselenium layers with the optical transparent features were irradiated by negatively charged electron beam which was emmited from Sr-90 radioisotope with 2.86 mCi activity. The swelling was the important parameters to use this thin film at the optoelectronic layers that have affected the safety and operating life of the equipments and systems in nuclear applications.
Tracking optical properties of ZnO:Mg thin films: experimental and first principles calculations
(Elsevier Science Ltd, 2022) Canci Matur, Utku; Duru, İzzet Paruğ; Akcan, Doğan
As low-cost transparent conducting oxides (TCO), ZnO based materials have been widely used in flat panels, sensors, glasses and transparent electronic systems. ZnO based thin films are preferable instead of other TCO materials such as Indium Tin Oxides (ITO) due to electrochemical stability, non-toxicity, low cost. The physical and chemical properties of ZnO based devices depend on the stoichiometry, amount of impurity (dopant), and deposition method. In this study Mg doped zinc oxide (MZO) thin films with doping ratio varying from 1% to 5% were deposited by sol-gel dip coating method to improve the physical characters by forming the grain size. Structural and optical properties were investigated by means of XRD analysis, ultraviolet-visible (UV-VIS) and photoluminescence (PL) spectroscopy. Moreover, DFTB + method was preferred to determine electronic properties based on structural information obtained from XRD analysis. Experimentally determined band-gaps were compared with theoretically calculated gap values in which oxygen vacancies are considered.
Energetic and exergetic analysis of thermophotovoltaic systems
(Institute of Thermal Technology, 2019) Utlu, Zafer; Karabuğa, Arif
Thermodynamic analysis of the thermophotovoltaic system was carried out in our research and the results are presented. Firstly, the thermophotovoltaic system was analyzed in three different regions. In the analysis, each part of the system is taken separately, while the whole system is handled separately. In the system, the first analysis was resolved following the first law of thermodynamics and the second according to the second law.The first region is the thermodynamic analysis of the heat source of energy that occurs with radiation until it reaches the filter. The second region is where the filter, selective-emitter and photovoltaic cells, considered as photovoltaic systems, take place. The heat radiating from the heat source is evaluated within the scope of the thermodynamic analysis of the heat generated by the electrospinning and the electromotive force of each element. The third region, which is expressed as the last region, is considered to be the part where electric energy is stored. Within the thermodynamic analysis of each region, energy and exergy analysis were carried out and the system was analyzed from part to part. As a result of this induction method, a general energy and exergy efficiency of the whole thermophotovoltaic system is determined. Our results are supported by formulas. It is aimed that the work done will be an alternative to the existing electricity generation and will form a resource for future Works.
Advanced exergy analysis of cryogenic liquefaction system
(Institute of Thermal Technology, 2019) Karabuğa, Arif; Utlu, Zafer; Selbaş, Reşat
The elements in the air are separated by different methods and these elements are basically liquefied by three different methods (cryogenic, pressure swing adsorption and membrane). In this study, advanced exergy analysis of the nitrogen liquefaction unit was performed using the cryogenic liquefaction method. Advanced exergy analysis consists of four different splitting. These; endogenous/exogenous and avoidable/unavoidable exergy destruction. In the study, forward exergy analysis was performed for each component and endogenous, exogenous, unavoidable and avoidable values of these components were calculated. In the result of the study, the highest endogenous exergy degradation was found in the CM1 compressor with 32.56 kW, the highest exogenous exergy destruction was in the HE3 heat exchanger with 25.8 kW, the highest unavoidable exergy destruction was in the CM1 compressor with 22.55 kW and the highest avoidable value was in the HE1 heat exchanger with a value of 17.76 kW. Total exergy destruction of system were calculated as 755.08 kW.

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