Re: Quick calculations
"Yes, but we're not talking about material phases, are we?"
Actually, I thought you were when you stated;
"123MJ in every Kg of hydrogen *gas*."
I merely pointed out that it wouldn't matter if it was a solid brick of hydrogen, it would still have roughly the same amount of energy available for the same chemical reaction.
"How do you propose to release energy from hydrogen ions? You can't burn them, you know."
Uh, once you get the hydrogen out with the electrolytic cell it will burn just fine, that's the point. Ions have little to do with it and perhaps this and this will help clear things up. I think you're confused between what the kids are doing and another process as the only heat and pressure that these kids need is in the combustion chamber of the tiny engine they have.
Also, I didn't say it was efficient and I agree on that point. In fact I was probably being a bit generous saying the generator efficiency was 20% as it is probably less considering the engine likely isn't optimized for running on hydrogen who knows how good the electrical side is or its condition. I will say the amount of energy used to break those bonds is about 123 MJ per kilogram which, not so coincidentally, is exactly what comes out. The fact that inefficiency exists in the system means it isn't perpetual motion or "free energy" and is why it will take putting more energy than that into the electrolytic cell to get the hydrogen and only 20% or less will come out of the generator. Let's be honest they probably aren't using rare and expensive metals in their electrolytic cell so in total the process efficiency might be as high as 10% on a good day. Overall that's pretty poor since from the numbers I put above it's right on par with a 63 amp hour 12 volt car battery. In the long run, AC@18:35 has it right, it's an experiment, an interesting way of learning for these kids and if it's all there is then it's certainly better than nothing.