Hydrogen on demand

[bill25]

Whet do you think about this?

https://www.youtube.com/watch?v=T91uV___AKM

He is not claiming to use zero gas, it is just an additive through the air intake.

Biggest thing I have read is that the doubters say is you can't get more energy out of something than what you put in.

They are equating it to "water has zero energy" so the most energy you can get out of the water is the amount of electricity you use to separate it.
It seems like there are variables not being accounted for in this idea. (Chemistry is a weak topic for me)

I would argue that water has potential energy, not zero energy.

In the car example, you use the battery to separate the water. So that is the energy loss. But for the energy to be used in the engine, Hydrogen isn't the only part of the equation, there is the ignition and compression factor adding a stimulant/catalyst to the reaction so the real question is:

Is the energy loss from separation more or less that the explosive reaction where other "energies" are added as a catalyst?

So you have electrolysis (energy in) compared to compression, spark, H2 and gas to produce water, and exhaust (energy out).
There is also stability - H2O is more stable than H2 + fire.

[kevm14]

Of course you can't get more energy out than you put in. But you CAN use some energy to move existing energy around. What do I mean? Look at how a heat pump works, particularly when coupled with a geothermal heat exchange. You use some electricity to turn a compressor but the energy you put in actually allows you to pump heat into or out of the ground. That energy was already there; you are just using some electricity to pump it around to do something useful. That subtlety is interesting to me.

[bill25]

Here is the problem:

Water can be split by electrolysis into hydrogen and oxygen. The energy required to split water into hydrogen and oxygen by electrolysis or any other means is greater than the energy that can be collected when the hydrogen and oxygen recombine

it takes 282 KJ/mole to separate a mole of H from water,

The recombination of H2O during combustion is 242. There is actually a loss.

There may be other side effects though, you are combusting Hydrogen, getting that energy and also getting water vapor in the cylinder, which could cool the cylinder and make it more efficient.

So, if water injection helps MPG by having it run cooler and getting the steam effect, this would have the explosion and the steam, so would that be a double reaction?
Combustion to water and state change from water to gas?