Abstract: In order to investigate the optimum conditions of the autofrettage process for the fuel injection pipe in diesel engine, different levels of autofrettage pressure, pressure rising time, pressure holding time, and repetition of autofrettage were applied. The autofrettage residual stresses in the fuel injection pipe were experimentally measured by using X-ray diffractometer. As the overstrain level increased, the magnitude of compressive tangential residual stress at the bore increased. It was found that the rising time to the autofrettage pressure, holding time at the autofrettage pressure, and repeated application of the autofrettage pressure had no significant influence on the residual stress distributions in the pipe.

• Publication Date: 08-Jun-2014
• DOI: 10.15224/978-1-63248-022-4-49
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Abstract: Nowadays, photovoltaic (PV) systems are widely used because of environmental concerns, electrical energy demand, cost of electricity generation, minimum service cost and support of governments on renewable energy conversion systems. The main drawback of PV systems is energy conversion efficiency. The two parameters that PV system output power depends on are solar radiation and temperature. Therefore, charge controllers are utilized to increase system efficiency. In this study, performance of 320 W solar panel groups which are controlled by two different charge controllers are investigated. The influence of charge controllers on system performance is presented with the analysis of obtained data. Experimental study is realized on a stand-alone energy system that is located in Davutpasa Campus of Yildiz Technical University.

• Publication Date: 08-Jun-2014
• DOI: 10.15224/978-1-63248-022-4-50
• Views: 0
• Downloads: 0