Abstract
The number of electricity users is increasing with the increase of fuel cost and environmental pollution. The mini hydro power has grown as an alternative energy source that can be easily constructed with the minimal environmental impact. This research access the mini hydro power plant implemented on Dabena River 50 years ago by German missionaries. But it is not functioning these days. The available Gross head of the river measured using a GPS receiver and was found to be 11.5m. It has a potential for producing 150 KW. With this output power, we can supply Bedelle Agricultural and Forestry College under Mettu University and nearby rural area. Having the head, flow rate and output power of the river into consideration, the turbine selected was cross flow turbine with specific speed of 243 rpm, runner diameter of 52 cm, runner length of 82 cm, blade radius 17 cm and blade number of 18. 24 poles synchronous motor was selected as the Generator with rotational speed of 250 rpm. International renewable energy agency cost analysis was used to analyze financial viability of the project. The annual energy production estimated was 289,908kwh and the anticipated revenue to be generated is 136,256 birr. The initial cost of the project estimated to be 2.475 million birr.
Highlights
Hydro-power is most common and widely used resource of electric power generation
The force exerted by water moving over turbine blades rotates the turbine runner; the turbine runner rotates the generator, which produces electricity
Using the results from this calculations the flow rate of the river in Open Channel and weir has been calculated, which are the main parameter as an input to calculate the capacity of the plant
Summary
Hydro-power is most common and widely used resource of electric power generation. Around 1880 the generation of electricity derived from hydro-turbines, and the capacity of installation worldwide has grown at about 5% per year since. 20% of world’s electric generation is from hydro power [1], [2]. Hydro-power is defined as generating electric power from falling water. It is energy from water sources such as the rivers, ocean, and waterfalls. Debena MHPP was designed and implemented 50 years ago by German missionaries to provide an electric power to Debena TVET College. This MHPP is not functioning these days. The driving forces that motivated us to conduct this research are: (i) Bedelle substation is highly loaded so that Bedelle agricultural and Forestry College introduce a high interruption of power (ii) Rural area peoples around Debena river needs electric power as EEPCO power hasn’t addressed.
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