Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2021Scopus SJRQ2/r/bayburt/13422
  Free vibration and buckling analysis of functionally graded sandwich beams by Navier's method; [Fonksiyonel derecelendirilmiş sandviç kirişlerin Navier yöntemiyle serbest titreşim ve burkulma analizi]

  Turan, Muhittin; Kahya, Volkan

  In this study, free vibration and buckling analyses of functionally graded (FGM) sandwich beams is investigated by Navier's method. Displacement field is defined according to the first order shear deformation theory, and the equations of motion are derived by the Lagrange's principle. Volumetric ceramic ratio is defined by a power-law rule. In the analytical solution, different trigonometric series functions are used for each end conditions considered. Two cases of functionally graded sandwich beams are considered: a) Homogeneous ceramic core and FGM faces (Type A), and b) FGM core and homogeneous faces (Type B). Natural frequencies and buckling loads are obtained for different boundary conditions, power-law indices and slenderness. Numerical results are compared with the available literature, and a good agreement are obtained between the results.

  AtıfScopus24·WoS21·OpenAlex16·TR Dizin7

  İncele
• MakaleAçık Erişim2018Scopus SJRQ1/r/bayburt/14301
  Thermodynamic and thermoeconomic analyses of an organic Rankine cycle adapted gas turbine cycle using S-CO2

  Tozlu, Alperen; Özahi, Emrah; Abusoglu, Aysegul

  In this study, a model of an organic Rankine cycle (ORC) adapted gas turbine cycle using supercritical CO2 (S-CO2) as working fluid is performed. Thermodynamic analyses of system are carried out using Aspen Plus and EES programs. As a result of the thermodynamic analyses, electricity production capacity, energy and exergy efficiencies of proposed system are evaluated as 1530.88 kW, 23.30 % and 59.60 %, respectively. For the thermoeconomic analysis of the system, specific exergy costing method, SPECO, is applied as widely used one among the second law based methods. Unit exergetic cost of electricity production for 1 kWh is found to be 7.28 cent and the total cost of electricity production for 1530.88 kWh is found to be 114.43 $. The annual return from the system of the ORC adapted gas turbine cycle using S-CO(2)which has total investment cost of 3,033,300 $ is evaluated as 741,146 $ taking into account the difference between the cost of electricity production and sale price of electricity. As a result of the thermoeconomic analysis, the payback period of system is found to be 4.09 years.

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  AtıfWoS7·OpenAlex2·TR Dizin3

  İncele
• MakaleYalnız künye2018Scopus SJRQ1/r/bayburt/13787
  Thermodynamic and thermoeconomic analyses of an organic Rankine cycle adapted gas turbine cycle using S-CO2 ; [Organik Rankine çevrimi entegre edilmiş S-CO2 kullanılan bir gaz türbin çevriminin termodinamik ve termoekonomik analizi]

  Tozlu, Alperen; Özahi, Emrah; Abuşoğlu, Ayşegül

  In this study, a model of an organic Rankine cycle (ORC) adopted gas turbine cycle using supercritical CO2 (S-CO2) as working fluid is performed. Thermodynamic analyses of a system are carried out using Aspen Plus and EES programs. As a result of thermodynamic analyses, electricity production capacity, energy and exergy efficiencies of the proposed system are evaluated as 1530.88 kW, 23.30% and 59.60%, respectively. For the thermoeconomic analysis of the system, specific exergy costing method, SPECO, is applied as widely used one among the second law based methods. Unit exergetic cost of electricity production for 1 kWh is found to be 7.28 ¢ and the total cost of electricity production for 1530.88 kWh is found to be 114.43 $. Annual return from the system of ORC adopted gas turbine cycle using S-CO2which has the total investment cost of 3,033,300 $ is evaluated as 741,146 $ taking into account the difference between the cost of electricity production and the sale price of electricity. As a result of the thermoeconomic analysis, the payback period of the system is found to be 4.09 years. Purpose: To propose a model (an organic Rankine cycle (ORC) adopted gas turbine cycle using supercritical CO2: S-CO2) for an existing solid waste power plant in the frame of the heat recovery (Waste-to-energy). Theory and Methods: Thermodynamic and thermoeconomic analyses were utilized for the proposed model in order to evaluate the energy and exergy efficiencies. Results: The energy and exergy efficiencies of the system were calculated as 23.30 % and 61.60 % respectively. 1 kWh of electricity generated from GT-ORC system is produced to 7.28 ¢. The total electricity production cost of 1530.88 kW-hours was calculated as $ 111.43. Conclusion: The total cost of the developed GT-ORC system is $ 3,033,300. The difference between the cost of electricity generated from the GT-ORC system and the cost of the electricity sales is expected to be $ 741,146 annually for the proposed GT-ORC system. As a result of this profit, the payback period of the system was calculated as 4.09 years.

  AtıfScopus8

  İncele
• MakaleYalnız künye2017Scopus SJRQ2/r/bayburt/15376
  Mikroalg üretimi ve mikroalglerden biyoyakıt eldesi

  Çakmakcı, Mehmet; Elcik, Harun

  Enerji ihtiyacının büyük bir bölümünü karşılayan fosil yakıt rezervleri hızla tükenmektedir ve bu yakıtların çevresel zararları her geçen gün artmaktadır. Bu sebeple, tüm gelişmiş ve gelişmekte olan ülkeler gibi ülkemiz de yenilenebilir enerji kaynaklarının kullanımına yönelmiştir. Bu kapsamda ülkemizde, yenilenebilir enerji yasası çıkarılarak yenilenebilir enerji kaynaklarının ekonomiye kazandırılması, sürdürülebilir enerji üretiminin desteklenmesi ve çevrenin korunması amaçlanmıştır. Son dönemde önemi artan yenilenebilir enerji kaynaklarından bir tanesi de biyokütle enerjisidir. Biyokütle enerji kaynağı olarak, ana bileşenleri karbonhidrat bileşikleri olan bitkisel ve hayvansal kökenli tüm organik maddeler kullanılabilmektedir. Bu enerji kaynakları içerisinde mikroalgler, yüksek fotosentetik etkinlikleri, yüksek biyokütle üretimleri ve hızlı çoğalmaları gibi avantajlarıyla biyoyakıt üretimi için umut verici görülmektedir. Mikroalglerden, biyokimyasal yöntemler ile elektrik, etanol, hidrojen, metan ve biyodizel üretilebildiği gibi termokimyasal yöntemler kullanılarak da sentez gazı, biyolojik kömür, biyodizel ve elektrik üretilebilmektedir. Bu derleme makalesinde, mikroalglerin izolasyonu, mikroalgal biyokütle üretimi, biyokütlenin hasadında kullanılan yöntemler ve mikroalglerin yenilenebilir biyoyakıtlar için ham madde kaynağı olarak kullanılabilirliği incelenmiştir

  AtıfTR Dizin11

  İncele
• MakaleAçık Erişim2017Scopus SJRQ2/r/bayburt/14182
  Microalgae production and biofuel from microalgae

  Elcik, Harun; Çakmakci, Mehmet

  Fossil fuel reserves which supplying a major portion of energy needs, are depleting rapidly, and its environmental damages increases day by day. Therefore, like all developed and developing countries, our country have focused on the use of renewable energy sources. Within this scope in the our country, it was aimed gain of renewable energy sources to economy, promotion of sustainable energy production, and protection of environmental. Recently, one of the growing importance of renewable energy sources is the biomass energy. As an biomass energy source, all vegetable and animal organic substances which the main components are comprising carbohydrate compounds can be used. In these energy sources, microalgae seem promising for biofuel production due to their many advantages such as they have high photosynthetic efficiency, high biomass production, and they grow quickly. From microalgae, by using biochemical methods electricity, ethanol, hydrogen, methane and biodiesel and thermochemical methods syngas, biochar, biodiesel and electricity can be produced. In this review article, isolation of microalgae, microalgal biomass production, the methods used to biomass harvesting, and the availability of microalgae as a source of raw materials for renewable biofuels were viewed.

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  AtıfWoS13·OpenAlex11

  İncele
• MakaleYalnız künye2010Scopus SJRQ2/r/bayburt/14431
  RESEARCH OF PESIMUM REACTIVE AGGREGATE RATIO OF THE PERLITE AGGREGATE WITH DIFFERENT METHODS

  Gökçe, H. Suleyman; Simsek, Osman

  In this study, it is purposed to determine of reactive aggregate ratio of the perlite aggregate for given up the highest length change. For this purpose, properties of relate to alkali-silica reaction (ASR) of the perlite aggregate determined with non-reactive limestone aggregate. For the determination of ASR, according to ASTM C 1260 accelerated mortar bar method, for microstructure; Scanning Electron Microscope (SEM) and Energy Dispersive X-ray (EDX) analysis were carried out on the samples which are perlite, limestone and used both of them. Mixtures were prepared by weight at 0, 10, 20, 30, 40, 50 and 100% ratios with usage of perlite aggregate that obtained from Ankara Cubuk region instead of limestone aggregate that obtained from Ankara Hasanoglan region. 21 pieces of mortar bars were produced for 7 different mixtures. The length change values of the samples were measured on the 3, 7, 10, 14, 21 and 28-day according to the accelerated mortar bar method. Morphology and chemical composition of highest length changed samples were determined with SEM and EDX. Increase of fracture density and Ca ratio was observed in parallel with the increase of length change. According to average of 14 days length change, 40% perlite aggregated samples underwent highest length change and these samples were determined as pesimum reactive aggregate ratio of the perlite aggregate.

  AtıfWoS3

  İncele
• MakaleYalnız künye2010Scopus SJRQ2/r/bayburt/14192
  DETERMINATION OF ALKALI-SILICA REACTION EFFECTS OF ZEOLITIC TUFF ADDITION ON THE DIFFERENT AGGREGATES

  Gökçe, H. Suleyman; Taban, Saniye; Simsek, Osman

  The aim of this study is to determine the alkali-silica reaction (ASR) related characteristics of crushed stones that are produced from rocks of perlite, andesite and limestone when zeolitic tuff (ZT) is used in the mortar mix as cement replacement in different ratios. Accelerated mortar bar experiments in accordance with ASTM C 1260 were carried out on crushed stone aggregate samples to determine the ASR. CEM I 42.5 R type cement was replaced by ZT material in the following ratios: 0, 10, 20, 30 and 40%; in order to investigate the effects of replacement on the ASR pertaining to the aggregate types, 45 mortar bar pieces were produced. The length change values of the samples were measured on the 3, 7, 14, 28, 42, 56 days according to the accelerated mortar bar method. Measured length changes for the control samples on 14(th) day were found to be 0.570% at the level of potentially harmful for perlite, 0.101% at the level of critic for andesite and 0.061% at the level of harmless for limestone. Length changes at the harmful levels were taken under control for perlite at 30 and 40%, for andesite at 20, 30 and 40% ZT replacement ratios. Length change values of all samples decrease as ZT replacement increases. As a result, ZT replacement is effective to suppress the ASR of reactive aggregates.

  AtıfWoS5

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