It barely produces enough power to overcome internal friction and stirring the air by the flywheel.
If the energy required to warm the water is not enough to charge a phone, then an attempt to retrieve a very small portion lost via steam and warm air will do even less.
It's okay to ask the question if you are ready for a tough love answer:
What a waste!
Instead of plugging in an electric kettle to heat the water, plug in a USB wall-wart.
Your efficiency will be a couple of orders of magnitude greater.
The wall wart will be much cheaper than the motor that is probably not available and would probably not work anyway.
-------------------- Ohm's law
Not just a good idea; It's the LAW!
Why then do you have low RPM electric motors on amazon. The Stirling does two resolutions (piston axis going around) per second about 120 rpm. In link above you got 10 rpm motor. My question is why can't you power it?
Even piston steam engine at one time power both machinery and factory's electricity. Piston engines are lower rpm then turn steam engines and yet back then they produce electricity. I have a link the modern marvels episode that got me interested in doing this project.
ok, how much work is being done, by spinning that "flywheel" ? (from your link originally posted ... I couldn't open your YT link). It looks like you're using the heat from the coffee cup to spin a flywheel, which you can easily stop with your hand (= not much work done).
"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
WEll go ahead and spend your money and find out the hard way.
Those motors are gear-motors. The motor turns much faster than 200 RPM but the gear train reduces the RPM at the output shaft.
It is often quite difficult to drive those motors from the shaft end.
With the higher ratio reductions (lower shaft speed) it may be impossible to turn the shaft manually without damaging the gears.
I did some looking for you.
Not usable but as an example, I found a 24 Volt motor that turns at 3500 RPM.
At 120 RPM this motor will generate 24 Volts x 120RPM/3500RPM = 0.82 Volts.
If you can find turns slower or that is rated for more voltage, you may get something that will theoretically work.
For example, if you can charge at 5 volts, look for a 3500 RPM motor rated for 3500RPM/120RPM x 5 Volts = 146 Volts.
Good luck with that in hobby motors.
Get a wall wart to charge you phone.
If you want to charge with heat energy, use a thermo-pile.
You can make that yourself with copper and iron wire.
-------------------- Ohm's law
Not just a good idea; It's the LAW!
Admittedly, copper and iron may not be the best choice of materials, although it will work. You may need a couple of thousand junctions to get a usable voltage. There are better choices of materials.
Look here and spend a few hours researching thermo-couples on the Omega site. Omega Site, thermo-couples
Look at the voltage per junction for the various types of thermo-couples.
Then check the price of bulk extension wire and make a selection.
For DIY you can make homebrew TCs out of extension wire.
Your time will be better spent in this direction.
-------------------- Ohm's law
Not just a good idea; It's the LAW!
Let me change gears with you beyond the obvious problems with using a Stirling engine I own run on this power.
The concept that I am really after is can you make a stirling engine work using the process that occurring in the following video. (this is concept and as I can see from my "knowledge" I don't have an engineering degree. I a simply looking at this from a point of view of someone with has a hobby for engines.
The link above shows a hot coffee heated by metal reacting to heat being moved around in sand. Sand deep enough traps different temperatures depending on the time of day. My theory is can you make a stirling engine where you use the process used in Turkish coffee to make a stirling engine that powered by geothermal temperatures. The temperature difference would then generate movement and thus "electricity". This is my idea.
The Stirling does two resolutions (piston axis going around) per second about 120 rpm. In link above you got 10 rpm motor. My question is why can't you power it?
Is that even a serious question? Have you taken Physics 101 yet? The linked motor is rated at 10 W input power; you're not going to get 10 W out of a cup of coffee for more than about 8 seconds, and that's if you're able to suck ALL the heat out of the coffee, which ain't going to happen.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!
in that video the person seems to be very careful with not touching the sand ... 'cause it's very hot ? And you don't know if they've cropped out most of the heating ?
You Have to put some much energy into the cup to make the water boil. Yes, you're working with more surface area than just the bottom of the cup.
Now you mention geo-thermal. Sure, a much higher temperature difference than you've been talking about. Not sure a Stirling engine would be more efficient than traditional geo-thermal.
"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.
