If only catching swarms was always this easy
Another step nearer pond power! Prototype Testing Day !!
The principal of making electricity is a very simple one. All that needs to happen is that magnets need to be spun inside lots of copper wire and voila! Making that happen using renewable resources is much more of a challenge. Today was testing day, The propeller has been fabricated from PVC pipe. We are delighted that it is running so smoothly. We will leaving running for a few days and look for improvements. All looking good so far.
Hydro update at Mill Pond
Flo REALLY likes the pipe !
There seem to be two different ways to build a hydro generator. The first involves maths (not our strong point) to predict how a generator will behave when installed and then buy kit to match (can be very expensive). The second is more of a tinkerers approach, building something that works for a purpose, suits a budget with the skills/resources available. Our approach is very much the latter, with a few sums thrown in.
When water enters the pipe, the suction causes a large vortex, sucking air into the pipe, causing the pipework to shake loudly and vibrate. We need to find a solution to this and build a screen of some-kind prevent plants and animals from being sucked down the pipe. Ensuring that the pipe contains only water is essential to maximise the force to turn a turbine.
We are trying to calculate the force with which water in a 20m 160mm diameter pipe with a head of 1.4m can turn a propeller of some kind. Does anyone fancy marking our homework? or any wisdom much appreciated.
Google says this equation will help
F=APV2
Here goes .. our solution is ....
P = water density (g/cm3) = 1g/cm2
A = surface area of the pipe (m2) (surface area = Οr2) = 0.2m2
V = water velocity (m/s) = gravity (9.8m/s) x height (1.4m) = 13.72 m/s
F = 0.2 x 1 x 188 = 37.6 N
or 3.8Kg of pushing power
I wonder what that could turn. Looks possible https://www.amazon.co.uk/Gearless-Permanent-Generator-Alternators-WithBase/dp/B08RNLLL37/ref=asc_df_B08RNLLL37?tag=bingshoppinga-21&linkCode=df0&hvadid=80264476830278&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583863996982965&th=1
So much water, we seem to have lost an island, though the swans aren't budging!
We'd like to be able to generate power from the water but it's not a straightforward process, or cost effective to do. We'd want to do the work ourselves but the information tends to be all for big hydrogeneration with a high head, while we have a very small project with low head, but consistent all year round flow that can be managed. Feels like it should be simple but after 12 years we still haven't cracked what we need to do. Maybe next year...
#microgeneration #hydropower #renewablepower #hydroelectric