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Hydropower is harnessed to generate electricity because it is clean, environmentally friendly and non-polluting. After the generation of electricity, water is re-released from hydropower plants to the environment. The re-released water still retains both its potential and kinetic energy which can be used to generate further electricity. An Archimedes screw turbine can be placed at the water terrace to collect energy stored in water and convert it to electricity. This research focused on the design of the Archimedes screw turbine based on the data from the Provincial Electricity Authority’s Namman small hydropower plant in Loei province, Thailand. Computational fluid dynamics (CFD) on ANSYS CFX program was used for the designing of the most efficient turbine. It was found that an Archimedes screw turbine with the following characteristics yielded the most promising result: three blades (b), each with a diameter (D) of 3 meter placed at an angle (a) of 25° to the horizontal plane. The water turbine was capable of generating maximum electricity of 60.36 kW and had a 42.38 % efficiency (the time of the study from May 2016 to February 2017). The generated power from the simulation was comparable to that calculated from the theory. Therefore, installation of Archimedes screw turbine is applicable at the Namman small hydro power plant.
Keywords: computational fluid dynamics; electricity production; Archimedes screw turbine; Namman small hydro power plant
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