Makine ve Metal Teknolojileri Bölümü Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12514/171

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Browsing Makine ve Metal Teknolojileri Bölümü Koleksiyonu by Publication Index "TR-Dizin"

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    Article
    Chemical characterization of waste tire pyrolysis products
    (International Advanced Researches and Engineering Journal, 2021) Uğuz, Gediz; Ayanoğlu, Abdulkadir
    The significance of tire disposal, an attractive waste to convert into burning oil or absorber etc.,has been increasing day by day. However, if it does not change into a useful form, it will damagethe nature and the living things. Thus, pyrolysis, a well-known method, which is used to convertrecycle tire waste into gas, liquid and char. On the other hand, the waste pyrolysis oil or wastetire oil (WTO) has a substantial avaliable calorific value similar to those of fossil fuels. Due topyrolysis reaction, high amount of sulfur is detected in the WTO; therefore, another step ofexplosion applied to WTO to decrease sulfur and also re-upgrade quality of oil with suchcatalysts as Calcium Oxide (CaO) and Natural Zeolite (NZ) at a ratio from 2 to 10 with anincrease of 2 for each step, individually. It is noticed that distillation test is a key analysis forseparation discrimination of rich or lean quality fuel. As a consequence of mixture of catalystWTO reactions, the best curve was observed at a 10% CaO-WTO mixture which was close todiesel#2 and the mixture was separated into two new fuels as light (Gasoline Like Fuel orabbreviated as GLF) and heavy one (Diesel Like Fuel or shortened as DLF) due to temperaturedifferences. According to distillation, FT-IR, NMR and UV–vis were used to analyze WTO,GLF and DLF for defining their characterization as well. Thus, the characterization result data ofsamples have quasi-equivalent with standard petroleum in open literature, and can be combustedin engine as well.
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    Article
    CONDENSATION ANALYSIS OF THE INSULATION OF WALLS IN MARDIN PROVINCE ACCORDING TO DIFFERENT LOCATIONS
    (2019) Ünal, Fatih
    In this study, condensation and vapor diffusion caused by different positioned insulation in the wall were analyzed for Mardin province. In the analysis, according to the 2008 standard of TS 825, the MATLAB calculation program was used with the Glaser graphing method and graphical user interface (GUI). Extruded polyurethane foam was used as the insulation material and normal unreinforced concrete was chosen as the wall. Evaporation and condensation values were determined by creating 6 different wall models with the same insulation thickness of 20 cm and an unreinforced concrete wall was covered with 2 cm plaster on the inside with a 3 cm thickness on the outside. The data obtained for 2 cm and 4 cm insulation thicknesses are presented in tables and the results are interpreted for Mardin province. Consequently, it was seen that the worst wall structure in terms of condensation and evaporation was obtained in the middle insulated wall and later in the interior insulated wall structure. The externally insulated wall did not show any condensation.
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    Article
    Citation - WoS: 3
    Citation - Scopus: 3
    Energy Consumption of Defrosting Process in No-Frost Refrigerators
    (Yildiz Technical Univ, 2018) Ozkan, D. B.; Unal, F.
    Refrigerators have high energy consumption because they consume energy throughout the day, and they are used in all residences and in most offices. Designing more efficient models and, thus, decreasing the energy consumption of refrigerators have become necessary, owing to the global energy scarcity. The purpose of this study was to decrease energy consumption and increase the efficiency of the defrosting process in no-frost refrigerators. The defrosting process plays an important role in the energy consumption of no-frost refrigerators. The amount of energy needed for defrosting and the time it takes are important factors for manufacturers in terms of energy performance. Recently, a theoretical correlation was developed as a function of the frost thickness, heat flux, and frost density for estimating the defrosting time of an evaporator fin surface. The melting time of the frost on the fin was calculated by a mathematical model and compared to results that were obtained experimentally. The results were differed from the actual melting time as 4.7%.
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    Article
    Lpg Yakıtlı Endüstriyel Yatay Tip Mısır Kurutma Tesisinin Enerji ve Maliyet Analizi
    (Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi, 2020) Ünal, Fatih; Bulut, Hüsamettin; Kahraman, Ahmet
    Bu çalışmada kurutma havasının ısıtılmasında LPG kullanılan yatay tip mısır kurutma tesisinin kurutma odasına farklı kurutma havası giriş sıcaklıkları ile elde edilen sonuçlara bağlı olarak enerji ve maliyet analizleri yapılmıştır. Kurutma sürecinde, sisteme sabit hava debisinde farklı sıcaklıklarda (85°C, 90°C ve 95°C) kurutma havası gönderilerek belirlenen düğüm noktalarında sıcaklık(°C), bağıl nem(%) ve hava hızı(m/s) ölçülmüştür. Sistemde belirlenen 6 adet düğüm noktasından elde edilen verilere bağlı olarak yapılan enerji ve maliyet analizinde kurutma havası giriş sıcaklığı, ısıtıcı giriş havasının sıcaklığı ve bağıl nem değişimlerinin yakıt sarfiyatı, enerji verimliliği ve birim kurutma maliyet üzerindeki etkileri değerlendirilmiştir. Sonuç olarak, kurutma giriş havası sıcaklığının artmasının enerji verimliliğini düşürdüğü, birim kurutma maliyetini ve yakıt sarfiyatını artırdığı tespit edilmiştir. Isıtıcı giriş havasının bağıl neminin artması ile yakıt sarfiyatının ve birim kurutma maliyetinin arttığı ve enerji verimliliğinin düştüğü tespit edilmiştir.