Yazar "Mühendislik Fakültesi" için Enerji Sistemleri Mühendisliği Bölümü Makale Koleksiyonu listeleme
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6-Anahtarlı 3-seviyeli eviricide uzay vektör darbe genişlik modülasyon tekniğinin uygulaması
Saygın, Ali; Kerem, Alper (DÜZCE ÜNİV., 2017)Uzay vektör darbe genişlik modülasyonu (UVDGM) tekniği bu çalışma ile 6-anahtarlı 3-seviyeli evirici üzerinde denenmiştir. Evirici topolojisinde 6 adet IGBT yarıiletkenanahtar kullanılarak eviricinin her bir çıkış uçlarına ... -
A new catalyst of AlCu@ZnO for hydrogen evolution reaction
Hüner, Bulut; Farsak, Murat; Telli, Esra (OSMANİYE KORKUT ATA ÜNİVERSİTESİ, 2018)Thin films of undoped ZnO, Al-doped ZnO, Cu-doped ZnO, and AlCu@ZnO deposited on indium tin oxide were performed by the sol-gel spin coating method. The prepared ZnO thin films were investigated for their structural and ... -
Analysis with computational fluid dynamics software of a Shell-and-Tube heat exchanger using molten salt as heat transfer fluid
Söyler, Mustafa; Aktaş, Mustafa (GAZI UNIV., 2018)In this present study, heat transfer performance of a shell and tube heat exchanger used molten salt is analyzed by a computational fluid dynamic (CFD) programing. The model is prepared regard as a literature study that ... -
Copper – Zinc and Copper-Iron Binary Electrode for Hydrogen Evolution Reaction
Telli, Esra (SAKARYA ÜNİV., 2018)The different coatings with high hydrogen evolution reaction (HER) durability activity were prepared by electrodeposition. Iron, copper and zinc alloys were deposited on graphite electrode. The binary coating prepared ... -
Determination of Weibull parameters by different numerical methods and analysis of wind power density in Osmaniye, Turkey
Kaplan, Yusuf Alper (SHARIF UNIV TECHNOLOGY, 2017)In this study, the potential of wind energy in Osmaniye Region has been analysed statistically on the basis of information that has been measured hourly between the years 2009 to 2013. The two-parameter Weibull Distribution ... -
Determination of weibull parameters using the standard deviation method and performance comparison at different locations
Kaplan, Y. A. (SHARIF UNIV TECHNOLOGY, 2020)This paper analyzed the harmony of the Weibull Distribution Function (WDF) and the real data obtained from three different locations. The Standard Deviation Method (SDM) was used to calculate the coefficients of the WDF ... -
Determination of wind potential of a specific region using Artificial neural networks
Taşdemir, Şakir; Yanıktepe, Bülent; Güher, A. Burak (Advanced Technology and Science, 2017)There is a widespread trend in alternative energy sources in today's world. Achieving energy without harming the environment has been the most important target of the countries in recent years. For this reason, it is ... -
Effective estimation of hourly global solar radiation using machine learning algorithms
Güher, Abdurrahman Burak; Taşdemir, Şakir; Yanıktepe, Bülent (HINDAWI LTD, ADAM HOUSE,, 2020)The precise estimation of solar radiation is of great importance in solar energy applications with respect to installation and capacity. In estimate modelling on selected target locations, various computer-based and ... -
Electrocatalytic oxidation of methanol on Ru deposited NiZn catalystat graphite in alkaline medium
Telli, Esra; Döner, Ali; Kardaş, Gülfeza (ELSEVİER, 2013)The methanol oxidation on C/NiZn-Ru electrode in a 1.00 M KOH and 1.00 M KOH + 1.00 M methanolsolutions at different scan rates and temperatures was studied by the cyclic voltammetry (CV), electro-chemical impedance ... -
Electrochemical performance of lithium molybdenum composite catalyst in oxygen reduction reaction
Ongun Yüce, Ayşe; Farsak, Murat; Akgül, Fatma Sevim; Tezcan, Fatih; Telli, Esra; Kardaş, Gülfeza (ELSEVİER, 2015)A gel/LiMo catalyst was prepared as a cathode material via the solegel process and applied calcination at different times. The influence of calcination times, properties and the electrochemical performance of the catalyst ... -
Energy and exergy analysis of an organic Rankine-Brayton combined cycle
Kaşka, Önder; Bor, Onur; Tokgöz, Nehir (GAZI UNIV, 2018)In this study, thermodynamic analysis of reheat and intercooled Brayton cycle combined with organic Rankine cycle (ORC) using waste heat from intercooler in Brayton cycle as heat source is presented. The effects of different ... -
Entropy Generation for Nonisothermal Fluid Flow: Variable Thermal Conductivity and Viscosity Case
Özalp, Coşkun (HINDAWI PUBLISHING CORPORATION, 2013)This paper investigates the entropy generation of a nonisothermal, incompressible Newtonian fluid flowing under the effect of a constant pressure gradient in plane Poiseuille flow. The effects of variable viscosity and ... -
Experimental and quantum chemical studies on corrosion inhibition effect of 5,5 diphenyl 2-thiohydantoin on mild steel in HCl solution
Ongun Yüce, Ayşe; Telli, Esra; Doğru Mert, Başak; Kardaş, Gülfeza; Yazıcı, Birgül (ELSEVİER, 2016)The inhibition efficiency of 5,5 diphenyl 2-thiohydantoin (DPTH) against mild steel (MS) corrosion has been investigated in 0.1 M HCl solution by using electrochemical techniques and quantum chemical calculations. The ... -
Fe-Cu coated nickel mesh usage as cathode catalyst for hydrogen evolution reaction
Telli, Esra; Özer, Denizhan (ELSEVİER, 2018)Nickel mesh electrodes were used as the working electrode. Iron and copper were electrochemically deposited on the nickel mesh in different amounts. When electrochemical coatings had been carried out, different currents ... -
First and second law evaluation of combined brayton-organic rankine power cycle
Kaşka, Önder; Bor, Onur; Tokgöz, Nehir; Aksoy, Muhammed Murat (YILDIZ TECHNICAL UNIV., 2020)In the present work, we have conducted thermodynamic analysis of an organic Rankine cycle (ORC) using waste heat from intercooler and regenerator in Brayton cycle with intercooling, reheating, and regeneration (BCIRR). ... -
Investigation of nanofluid flow characteristics and wall stress concentration locations in a 3D channel with sharp edge rectangular ribs
Yavuz, M. Murat (YILDIZ TECHNICAL UNIV, 2017)Flow regimes in various channels can introduce different responses that interact with inside of channel walls. Hence both flow characteristic and its effect on wall surfaces should be investigated, especially for a new ... -
Investigation of noble metal loading CoWZn electrode for HER
Telli, Esra; Farsak, Murat; Kardaş, Gülfeza (ELSEVİER, 2017)It is important to metal deposition on the electrode surface to increase the electrocatalytic activity of the electrodes. CoWZn coated the graphite rod was used to prepare the cathode electrode. Moreover, then Pt and Ru ... -
Optimization of the pool boiling heat transfer in the region of the Isolated bubbles using the ABC algorithm
Alic, E.; Çermik, O.; Tokgöz, Nehir; Tokgöz, Nehir (ISFAHAN UNIV TECHNOLOGY, 2019)The region of the isolated bubble regime, in which the bubbling starts, is a very significant process for boiling heat transfer. In this study, Artificial Bee Colony algorithm (ABC), which is mainly based on the searching ... -
Rheological behavior of sumac (Rhus coriaria L.) extract as affected by temperature and concentration and investigation of flow behavior with CFD
Bozdoğan, Adnan; Yaşar, Kurban; Söyler, Mustafa; Özalp, Coşkun (BIOINTERFACE RESEARCH APPLIED CHEMISTRY,, 2020)The purpose of this study is to investigate the theological properties of sumac extract indifferent concentrations at different temperatures as well as its flow behavior in sudden expansion contraction and at 90 elbow with ... -
The electrocatalytic properties of lithium copper composite in the oxygen reduction reaction
Farsak, Murat; Telli, Esra; Tezcan, Fatih; Akgül, Fatma Sevim; Ongun Yüce, Ayşe; Kardaş, Gülfeza (ELSEVİER, 2014)A new carbon supported lithium-copper cathode catalyst (gel@LiCu) is composed of activated carbon (@) supported gel, LiNO3 and CuCl2 mixture is investigated in the oxygen reduction reaction. The gel@LiCu cathode, which ...