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This paper deals the concept of efficiency calculation for varying head and varying discharge conditions of a micro hydropower plant. Due to increasing pollution and depletion of ozone layer from foss...il fuels and other conventional energy sources, the renewable energy became an important source to avoid the above effects. In large hydro power plant, a dam is built to maintain the constant head. But, in micro hydro power plant, there exist a varying head and varying discharge condition due to absence of any storage system. The head variations at a site changes the unit speed and unit discharge of the turbine and caused to change in efficiency points on hill chart. A varying discharge only at the site is easy to handle but, when both head and discharge varies, it becomes complicated. In this case model test curve (Hills curve) of the turbine is used to calculate the efficiency. In this paper, the micro hydropower system has been designed and corresponding efficiency calculation of the turbine has been explained. It is found that efficiency of the turbine will depend on, both the system design and the head variation at the site.続きを見る
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