| Summary: | Electricity is a resource of the most widely used today because it has many
functions, including in support of human life. In addition to relying on fossil fuel
and coal in limited amounts in nature, one application is directed is the utilization
of renewable energy. One source of renewable energy that is potentially in
Indonesia is the utilization of water energy. There are several objectives achieved
in this research is designing a hydrofoil of NACA 0024 on a waterwheel, build a
prototype of waterwheel, analyze the changes in efficiency with five different types
of angles (0
o
, 10
o
, 20
o
, 30
o
and 40
o
) and test the performance of waterwheel on the
angle to achieve maximum efficiency.
The initial stage of designing the hydrofoil of NACA 0024 is determining the
coordinates of NACA. Blade design with a length of 49 cm and width of 19 cm will
be assembled into a horizontal axis of waterwheel with a diameter of 75 cm.
Number of blade 8 pieces. Transmission system used is one level transmission
system. The main variables studied are the torque and efficiency of waterwheel.
Performance parameters studied were current, voltage, waterwheel rotation,
rotation of generator, power output, frequency of generator and generator
efficiency.
Maximum efficiency which achieved at an angle of 40
o
blade installation was
11,40%. Value of torque achieved from the measurement was 20,58 Nm and the
potential power was achieved at 81,85 Watts. Assuming the blade in static
condition when bypassed the water with speed of velocity 1,9 m/s, the blade had
drag force at 524,481 N and lift force at 12,144 N with computation fluid
dynamics using Fluent. Testing performance with electrical loading resulted
voltage was 203 Volts at no-load conditions and produced a maximum electric
power at 17,87 Watts with a voltage at 178,6 Volts, the current was 0,13 A, the
rotation of waterwheel was 37 rpm, 780 rpm rotation of generator, frequency was
25,3 Hz and generator efficiency reached 21,83%.
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