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Articles by Halil Unal
Total Records ( 3 ) for Halil Unal
  Asli Ayhan , Liu Qingyu , Kamil Alibas and Halil Unal
  Increase of world population and continuation of industrialization increase energy requirement. Meeting these requirements with fossil based fuels increase greenhouse gas emissions, cause environment-air pollution and global warming. Environment-friendly biogas output and utilization which decrease production input gains importance in meeting energy requirement in agricultural enterprises. Dairy cattle manure and maize silage are the common substrates for anaerobic digestion in agricultural enterprises. In this study, biogas production in anaerobic digestion is studied under mesophilic conditions for 60 days. Laboratory scale experiments were performed on the digestion of dairy cattle manure and maize silage at different mixing rate. The results showed that co-digestion of dairy cattle manure and maize silage have positive effects on biogas production and methane content of biogas. The highest biogas production was measured at the DM 6% content and the manure:silage rate 3:1. Also, the highest methane content was measured at the highest silage rate.
  Ali Vardar and Halil Unal
  In this study, the use of individual wind turbines towards meeting the electricity demands of a plant was emphasized. For this purpose, the electrical energy demand of the plant was revealed and then the mathematical equations directed towards determining whether the selected wind turbine could meet the electrical energy demand of the plant. The use of four types of wind turbines with different technical features for meeting the energy demands of three plants with different characteristics was evaluated in view of the mathematical equations established. The suitable wind turbines as well as the unsuitable ones were determined for every plant as a result of evaluations. This study was designed especially in a way that the plant which intends to take benefit of wind energy could pattern after. It is possible for the managements to determine the suitable wind turbines for themselves by putting their own data in the mathematical equations.
  Yucel Tekin , Esref Isik , Halil Unal and Rasim Okursoy
  The physical properties of Turkish Göynük Bombay bean grains were determined as a function of moisture content in the range of 10.25-25.6% dry basis (d.b.). The average length, width and thickness were 22.60, 13.57 and 10.25 mm, at a moisture content of 10.25% d.b., respectively. In the above moisture range, the arithmetic and geometric mean diameters increased from 15.477 to 16.283 mm and from 14.617 to 14.825 mm, respectively, while the sphericity decreased from 0.734 to 0.599. In the moisture range from 10.25 to 25.6% d.b., Studies on rewetted Turkish Göynük Bombay bean grains showed that the thousand grain mass increased from 1700 to 2170 g, the projected area from 185.80 to 225.44 mm2, the true density from 1301.60 to 1452.80 kg m-3,the porosity from 46.287 to 63.047% and the terminal velocity from 6.20 to 6.98 m sec-1.The bulk density decreased from 664.95 to 536.19 kg m-3 with an increase in the moisture content range of 10.25-25.6% d.b. The static coefficient of friction of Turkish Gunk Bombay bean grains increased the linearly against surfaces of six structural materials, namely, rubber (0.41-0.60), aluminum (0.33-0.48), stainless steel (0.29-0.40), galvanized iron (0.32-0.43), glass (0.28-0.40) and mdf (medium density fiberboard) (0.24-0.36) as the moisture content increased from 10.25 to 25.6% d.b. The shelling resistance of Turkish Göynük Bombay beans grain decreased as the moisture content increased from 100.76 to 59.01 N.
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