I am a student designing a hydro electric generator used on rivers to collect kinetic energy from horizontal water flow, rather than potential energy from vertical water drops.
My idea is to turn a large wheel using the water flow, this is connected to a smaller wheel using a belt in order to increase RPM.
It is used solely to charge as many 17Ah 12V batteries as possible from the power generated.
A generator I have been looking at in particular is this: 1.3kw single-phase motor, 3400 RPM, 110VAC, 15.3A.
Here are my calculations:
- Water velocity = 2m/s, big wheel circumference = 75cm
- This gives 2.66 RPS which is 160RPM
- to reach the 3400 RPM of the motor the small wheel must be (3400/160) = 21.25 times smaller
- this means the circumference of the small wheel is (75cm /21.25) = 3.59cm
- this in turn means the diameter is (3.59/pi) = 1.12cm
It seems like this is a very small wheel to be turning such a large motor. Is this diameter too small to function correctly?