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Öğe Atık kızartma yağlarının alternatif dizel motor yakıtı olarak değerlendirilmesi(TMMOB Makina Mühendisleri Odası, 2011) Adin, Hamit; Yaşar, Fevzi; Altun, ŞehmusÖğe Batman ilinin doğal gaz ihtiyacının ve hava kirliliğini azaltmasının matematiksel yöntemlerle modellenmesi(Karabük Üniversitesi, 2009) Aydın, Hüseyin; Yaşar, Fevzi; Bezek Güre, ÖzlemÖğe The fuel properties of methyl esters produced from canola oil- animal tallow blends by basecatalyzed transesterification(Kırıkkale Üniversitesi, 2010-06) Altun, Şehmus; Yaşar, Fevzi; Öner, CengizBiodiesel is an alternative diesel fuel that can be produced from renewable feedstocks such as vegetable oil or animal fats by transesterification with methanol for using in diesel engines. The viscosity and density of biodiesel fuels are important parameters due to being key fuel properties for injection and combustion process of diesel engines. These fuel properties mainly depend on the feedstock which is used in the biodiesel production. In this study, the blends containing 0, 25, 50, 75 and 100% of food-grade canola oil/inedible animal tallow in volume basis were prepared and converted into methyl esters by base-catalyzed transesterification. Effect of inedible animal tallow-canola oil blends on the viscosity and density of methyl esters were investigated. Experimental results showed that the kinematics viscosity of methyl esters increased as animal tallow ratio increased in the feedstock. Besides, it was observed that density did not change muchÖğe Onarımda kullanılan darbe dayanımlı iki bileşenli yapıştırıcılar(Fırat Üniversitesi, 2011) Adin, Hamit; Altun, Şehmus; Yaşar, FevziÖğe Biodiesel properties of microalgae (Chlorella protothecoides) oil for use in diesel engines(Taylor & Francis, 2018-09-08) Yaşar, Fevzi; Altun, ŞehmusIn this study, biodiesel was produced from a microalgae oil, chlorella protothecoides, by typical alkali-catalyzed transesterification in conditions such as a 0.75 wt.% KOH of the oil as catalyst, 68°C and 80 min which was agreed as optimal conditions after investigating the effect of KOH concentration, reaction temperature and time at constant molar ratio of 6:1 on the conversion rate and fuel properties. Under these conditions, a 98.6% conversion rate of algae oil to its methyl ester was achieved with ester content higher than 96%. Furthermore, all physicochemical properties met the requirements of international biodiesel standards, EN 14214 and ASTM D 6751, with some remarkable ones such as high cetane number (57.3) and low CFPP (−10°C). The effect of microalgae biodiesel volume fraction in the fuel on the kinematic viscosity, CFPP, lubricity, density, and distillation temperature was also studied. A blending ratio of the algal-biodiesel up to 50% (v/v) was also found in agreement with the standards for biodiesel-diesel blends. From GC analysis, oleic and linoleic acids were found to be major fatty acids, and then the oxygen extended sooting index and adiabatic flame temperature were calculated using fatty acid distribution for evaluating the main diesel emissions such as soot and NO. As a result, the algae oil studied here was found to be an appropriate raw material for producing biodiesel and for using in Diesel Engines and its properties are within the typical ranges of conventional biodiesel fuels.Öğe A comparison of performance and emissions of a diesel power generator fueled with biodiesels from waste frying oils(The International University of Sarajevo, 2013) Altun, Şehmus; Yaşar, FevziÖğe Biodiesel production from raw cottonseed oil and its characterization(Energy Education Science and Technolgy Part A, 2011-07) Altun, Şehmus; Yaşar, Fevzi; Öner, CengizIn this study, raw cottonseed oil of Turkish origin was transesterified using methyl alcohol and an alkali catalyst to obtain the cottonseed oil methyl ester. The obtained cottonseed oil methyl ester was analyzed by gas chromatography (GC) for determining the fatty acid composition. The fuel-related properties of cottonseed oil methyl ester, cold filter plugging point, cloud point, kinematic viscosity, density, cetane index, flash point, distillation, sulfur content and heating value were determined and compared with those of petroleum diesel fuel and international biodiesel standards. From gas chromatograph analysis, it was found that the cottonseed oil methyl ester has the more amount of total unsaturated FA, therefore, it showed better cold-flow properties than more saturated ones, as expected. Moreover, the fuel-related properties of cottonseed oil methyl ester were within the specified standardsÖğe Şırnak yöresindeki asfaltit kömürler ve özellikleri(Dicle Üniversitesi, 2010) Adin, Hamit; Altun, Şehmus; Yaşar, FevziEnerjinin giderek küreselleşmesi ve değişen piyasa şartları ile izlenen liberal ekonomik modeller; bir yanda dışa bağımlılığı asgari seviyelere çekecek, öte yandan ekonomik canlanmaya en üst düzeyde katkıda bulunacak enerji politikalarının uygulanmasını gerekli hale getirmektedir. Sadece diğer fosil kaynaklara göre rezervin büyüklüğü açısından değil, kömür yataklarının yurdumuzun çeşitli bölgelerine dağılmış olması, ekonomik kalkınmaya son derece olumlu etkide bulunması, işletilmesi nedeniyle ortaya çıkan katma değer, elektrik enerjisi üretiminde ucuz hammadde olması ve emniyetli taşınması gibi faktörler kömürü en önemli fosil enerji kaynağı haline getirmektedir. Bu çalışmada, Şırnak kömürü çeşitli yönleriyle ele alınmış, sorunlar tartışılmış ve çözüme yönelik politikalar oluşturulmaya çalışılmıştırÖğe Asfalt depolama tanklarının kızgın yağ ile ısıtılması ve sistemdeki ısı transferinin incelenmesi(Fırat Üniversitesi, 2011) Adin, Hamit; Altun, Şehmus; Yaşar, Fevzi; Işık, Mehmet Zerrakki; Işık, Süleyman KazımÖğe Biodiesel production from leather industry wastes as an alternative feedstock and its use in diesel engines(SAGE, 2013-11-01) Altun, Şehmus; Yaşar, FevziWaste leather fat is produced by the leather industry in fleshing processing and discarded as waste. These wastes can be used as a potential feedstock for biodiesel production due to their considerable fat content. In this work, raw fleshing oil which is a fat-originated waste of the leather industry was transesterified using methanol in the presence of an alkali catalyst to obtain biodiesel. The obtained biodiesel was then used in a four-stroke and direct injection diesel engine to evaluate the biodiesel behavior as an alternative diesel fuel, at a constant speed under variable load conditions. Blends [20 and 50% (v/v)] of biodiesel with diesel reference fuel were tested too. The emissions test results compared with diesel reference fuel showed that diesel engine fueled by biodiesel emitted significantly lower opacity and gaseous emissions than the same engine fueled by diesel reference fuel, and with very similar performance. The obtained data indicated that biodiesel from leather industry wastes is promising as an alternative fuel for diesel engines, and can be used to substitute diesel fuel in terms of performance and emission parameters without any engine modification.
