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Öğe BIOGAS PRODUCTION FROM ANIMAL MANURE(Taylors Univ Sdn Bhd, 2015) Recebli, Z.; Selimli, S.; Ozkaymak, M.; Gonc, O.An experimental study worked on a model biogas production unit which has 0.5 m(3) fermentation tank capacities of a breeding farm in the Urla district of Izmir/Turkey. The farm animal quantity is 70 cattle and 1400 chicken. Animal wastes (poultry manure and bovine animals manure) were anaerobically fermented in the tank. It is known in literature, the optimum fermentation occurs at 298-313 K temperatures. In this respect, experimentation was performed at summer season and average regional temperature was 307 K and so reaction does not require the extra heating for the optimization of process. Biogas production potential from bovine animal and poultry manure was separately studied. Firstly, 350 kg bovine animal manure blend (175 kg manure+ 175 kg water) filled to the tank and the process occurred. Secondly, 375 kg poultry manure blend (50 kg manure+ 325 kg water) was filled to the tank and the processes done. Then the biogas production rates was evaluated and compared for two processes. Results showed that daily 6.33 m(3) and 0.83 m(3) biogas productions were obtained from fermentation of bovine animal manure and poultry animal manure. Lower heating value of natural gas was known 34,000 kJ/m(3) and biogas LHV value was predicted 21,000 kJ/m3 by the 62% CH4 content. By using biogas as a fuel to the heating or energy systems instead of natural gas about 0.35 $/m(3) energy cost is saved.Öğe Biogas production from animal manure(Taylor's University, 2015) Recebli, Z.; Selimli, S.; Ozkaymak, M.; Gonc, O.An experimental study worked on a model biogas production unit which has 0.5 m3 fermentation tank capacities of a breeding farm in the Urla district of Izmir/Turkey. The farm animal quantity is 70 cattle and 1400 chicken. Animal wastes (poultry manure and bovine animals manure) were anaerobically fermented in the tank. It is known in literature, the optimum fermentation occurs at 298-313 K temperatures. In this respect, experimentation was performed at summer season and average regional temperature was 307 K and so reaction does not require the extra heating for the optimization of process. Biogas production potential from bovine animal and poultry manure was separately studied. Firstly, 350 kg bovine animal manure blend (175 kg manure+175 kg water) filled to the tank and the process occurred. Secondly, 375 kg poultry manure blend (50 kg manure+325 kg water) was filled to the tank and the processes done. Then the biogas production rates was evaluated and compared for two processes. Results showed that daily 6.33 m3 and 0.83 m3 biogas productions were obtained from fermentation of bovine animal manure and poultry animal manure. Lower heating value of natural gas was known 34,000 kJ/m3, and biogas LHV value was predicted 21,000 kJ/m3 by the 62% CH4 content. By using biogas as a fuel to the heating or energy systems instead of natural gas about 0.35 $/m3 energy cost is saved. © School of Engineering, Taylor’s University.Öğe Convectional heat transfer numerical analysis of mhd steady state laminar lithium pipe flow(Begell House Inc., 2014) Recebli, Z.; Selimli, S.this paper discuss about the effect of normally applied magnetic field on steady state laminar flow of liquid lithium in a horizontal circular pipe model was analysed with ANSYS Fluent, and also convectional heat transfer was examined. Examination was completed by ANSYS Fluent MHD module; the theoretical base of the module established on the Navier Stokes, continuity equation and energy equations. Flow profile was observed for cooling of the fluid with a constant wall temperature. Thermal fully developed but hydro-dynamically transient region of flow was taken to observations. Results of the examination showed that, increase of magnetic field induction, decreased the local flow velocity, but also increased the Nusselt number through the pipe length. Moreover, while the liquid lithium was cooling, the fluid temperature was increased by the increase of magnetic field induction through the pipe length. Increase of magnetic field induction enhanced the convective heat transfer and so, indirectly improved the cooling of liquid lithium. © 2014, Begell House Inc. All rights reserved.Öğe An Experimental Study of the Effects of Heat-Sink Surface Form on PV Module Cooling and Electrical Performance(American Society of Civil Engineers (ASCE), 2023) Ekiz, A.; Selimli, S.; Dumrul, H.In this study, the effect of the fin surface on the electrical performance of passively cooled photovoltaics (PV) modules equipped with flat (PVf) and tread (PVt) surface finned heat sinks was experimentally investigated. PVf and PVt modules were fabricated with heat sinks by filling phase change material (paraffin)/aluminum chip mixture between the PV module and heat sink. The mean ambient temperature, solar radiation, and solar power during the experiment were about 13°C, 864 W/m2, and 247, respectively. The electrical power of the PVf and PVt modules was increased by 10.84% and 17.2%, respectively, while the average temperature was decreased by 11.78% and 16.5%, respectively, compared to the PV module. The PVt module provided 5.37% more effective cooling and a 5.74% higher electrical power than the PVf module. The electrical efficiency of the PV module was 11.35%, and the rate of increase was 1.21% and 1.95% for the PVf and PVt modules via cooling. Compared to the PV module, the electrical exergy of the PVf and PVt modules increased by 10.84% and 17.2%, respectively, at an average solar exergy of 230.61 W, while their thermal exergy decreased by 23.64% and 32.3%, respectively. Compared to the PVf module, the thermal exergy of the PVt module was reduced by 11.34%, and the electrical exergy was increased by 5.74%. The increase in exergy efficiency is 3.14% and 4.51% for PVf and PVt modules versus the PV module. © 2022 American Society of Civil Engineers.
