Yazar "Karaman, Vedat" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Calculation and Optimizing of Brake Thermal Efficiency of Diesel Engines Based on Theoretical Diesel Cycle Parameters
    (İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2016-09-14) Karaman, Vedat; Yıldızhan, Şafak; Özcanlı, Mustafa; Serin, Hasan
    In this study, a theoretical study has been evaluated in order to calculate and optimize diesel engine brake thermal efficiency values. In the study three main parameters which are compression ratio, ratio of specific heat and cut-off ratio, based on ideal diesel cycle were evaluated. Compression ratio, ratio of specific heats and cut-off ratios were chosen between the interval of; 12:1-24:1, 1,2-1,4 and 1,5-3,0, respectively. Theoretical study showed that compression ratio significantly affects the engine characteristics that calculated in this study. Experiments revealed that the higher compression ratio results with higher brake thermal efficiency (BTHE) and thus lower specific fuel consumption (SFC). The calculation study showed that increasing cut-off ratio caused to decrease of brake thermal efficiency. Also, study revealed that increment of ratio of specific heats improved brake thermal efficiency.
  • Küçük Resim
    Öğe
    Improvement of Density, Viscosity and Cold Flow Properties of Palm Oil Biodiesel by Alcohol Addition
    (İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2016-06-22) Uludamar, Erinc; Karaman, Vedat; Yıldızhan, Şafak; Serin, Hasan
    Alternative fuel researches has gained very importance due to depletion threads of fossil fuels, strictly narrowing emission regulations and high cost of petroleum. Biodiesel one of the most favorite alternative fuels since it is renewable and cleaner energy source. Many vegetable oils and animal fats are used for biodiesel production as raw material. Palm oil is an edible vegetable oil derived from the mesocarp (reddish pulp) of the fruit of the oil palms which is produced widely in some regions and used as raw material for many industrial sectors. Palm oil can be used as feedstock for biodiesel production but it has some drawbacks such as high viscosity and bad cold flow properties. In this study, some fuel properties of biodiesel produced from palm oil and its blends with various alcohols such as isopropyl alcohol, ethanol, and methanol were investigated. The study showed that the inadequate fuel properties of palm oil biodiesel such as viscosity and cold flow properties can be improved with varıous alcohol addition with the POME-5% methanol (CH3OH).