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Usak, Turkey

An experimental study has been carried out to investigate the bearing strength behavior of pinned joints of glass fiber reinforced composite filled with different proportions of Al2O3 particles, as a function of filler loading and joint geometry. The weight fractions of the filler in the matrix were 7.5, 10, and 15%. Single-hole pin-loaded specimens of each composite material were tested in tension. The results show that the bearing strength of glass fiber reinforced epoxy composites pinned joints is associated with the filler content and geometric parameters. The increase of the Al2O3 particle loading in the matrix improved the bearing strength of the composites. The highest bearing strengths were obtained for composite specimens with 10 wt.% Al2O3 particle content. Further increases in the Al2O3 particle content in the matrix resulted in a decrease of the bearing strength, but remains above that of the unfilled glass reinforced epoxy composites. © 2009 Elsevier Ltd. All rights reserved.

Caliskan H.,Usak University
Energy Conversion and Management | Year: 2014

In this study, novel approaches to exergy and economy based enhanced environmental analyses for energy systems are explained. The methods are named as "exergoenvironment" (EXEN) and "exergoenviroeconomic" (EXENEC). These two analyses are also performed to the three conventional (fuel-oil, coal, natural gas) and two renewable (solar PV, wind turbine) energy options based electricity generation systems used for a building heating to show the reliability of the analyses. The EXEN analysis gives information relating to CO2 emission over time considering exergetic point of view. According to the EXEN results, greenhouse gas management can be achieved and CO2 reduction procedures can be prepared. On the other hand, EXENEC analysis presents the released CO2 price exergetically in a given period of time, while its unit is created to be $/time. EXENEC analysis can be helpful for the economic management of the greenhouse gases. Among the conventional energy options, the natural gas is the best choice, when the exergy based environmental & economical situations are considered. But, wind turbine energy option, which is one of the renewable energy options, is the best exergoenvironmental and exergoenviroeconomic choice among the all energy options. Because, the EXEN and EXENEC results are found minimum for this energy option to be 60 kg CO2/month and 0.87 $/month, respectively. So, these methods can be applied to the various energy options effectively, and the methods are useful for policy makers, researchers, decision makers and investors due to the enhanced methods' comprehensive environmental and exergetic approaches. © 2014 Elsevier Ltd. All rights reserved.

In this study, the response of a FG (functionally graded) coated truncated conical shell subjected to an axial load is investigated by means of non-linear equations governing the finite deformations of the shell. In the solution of non-linear basic equations in the finite deflection the Superposition and Galerkin methods have been used. The effects of material property of FG composite coatings and geometrical parameters on the non-linear critical axial load are discussed in detail through a parametric study. The results are verified by comparing the obtained values with those in the existing literature. © 2013 Elsevier Ltd.

Caliskan H.,Usak University
Energy Conversion and Management | Year: 2013

The energy and exergy analyses are performed to the human body for the summer season of the Izmir city in Turkey. It is found that the metabolism energy and exergy rates are the major part of the human body's energy generation. However, metabolism energy rate (58.326 W/m2) is much higher than corresponding exergetic one (1.661 W/m2). The maximum energy loss of the human body (70.59%) occurs due to heat exchange such as radiation, convection, and conduction. On the other hand, the maximum exergy loss of the human body happens due to exhaled humid air (6.393%), while the most of the total exergy is consumed by the human body (90.786%). Thermal comfort condition is also calculated. The Predicted Mean Vote (PMV) rate is found as 0.028 which means that the thermal sensation of the human body is called as comfortable. Furthermore, the Predicted Percentage Dissatisfied (PPD) rate is determined to be 5.017% which is low and shows the thermally dissatisfied people percentages. © 2013 Elsevier Ltd. All rights reserved.

Kandilli C.,Usak University
Energy Conversion and Management | Year: 2013

In the present study, a novel Concentrating Photovoltaic Combined System (CPVCS) based on the spectral decomposing approach is introduced, modeled, tested experimentally and evaluated thermodynamically and economically. In this study, energy and exergy analyses of the system have been evaluated, economical analysis has been performed and the experimental results have been compared to data obtained by the control system. As a result, energy efficiencies of concentrator, vacuum tube and overall CPVCS have been determined to be 15.35%; 49.86%; and 7.3% respectively. Similarly the second law (exergy) efficiencies of concentrator, vacuum tube and overall CPVCS are 12.06%; 2.0%; and 1.16% respectively. The cost of energy production has been stated as 6.37 $/W and it is predicted that this value could be decreased by improving the system performance. © 2012 Elsevier Ltd. All rights reserved.

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