Wind energy, one of the renewable energy sources, has now become a global power generation industry competing with other sources of energy generation. While the interest and investments for wind energy recycling systems are gradually increasing worldwide, both the scientific studies and commercial activities in this field in Turkey are expanding everyday. In this study, some economic subjects related with the energy obtained by wind turbines have examined and the effects of blade number and attack angle on annual maximum energy production obtained from the wind turbines having 4415 NACA and LS- 1 blade profiles, which are planned to erect in Malatya city, Turkey, have analyzed.
This paper describes an analysis of the prospects of reducing the cost of wind-generated electricity. Special attention has been paid to the dynamic development of wind turbines, i.e. development based on experience gained in the production and use of wind turbines. Historical and future cost reductions associated with wind turbines are described using experience curves. The results of the analysis show that although the experience curve for wind turbines indicates relatively moderate cost reductions there is potential for considerable cost reductions in wind-generated electricity. This is due to the fact that the cost of wind-generated electricity will be affected by improved performance and reduced operating and maintenance costs, in addition to the reduction in cost of wind turbines. The results show that the average cost of wind-generated electricity will almost be reduced by half by the year 2020, assuming an annual market growth of 15–20%.
Blunt trauma abdomen rarely leads to gastrointestinal injury in children and isolated gastric rupture is even rarer presentation. We are reporting a case of isolated gastric rupture after fall from height in a three year old male child.