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ihatereddit53 t1_iwrdcqd wrote

Reply to comment by Alis451 in Overhyping hydrogen as a fuel risks endangering net-zero goals by filosoful

Why cant u take the hydrogen atoms out of water? Then all you need for fuel is... water... and whatever crazy machine that can grab the hydrogen

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_Bl4ze t1_iwru7bn wrote

Electrolysis. Not a very crazy machine, but also not very efficient though.

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Alis451 t1_iwry9vy wrote

> Then all you need for fuel is... water...

water is super heavy and not very hydrogen dense, much unlike hydrocarbons, you are now back to the too heavy thing you are trying to prevent. also adding an electrolysis device TO the vehicle won't exactly... work. especially when you are trying to harvest green energy, from you know... solar/wind/etc. power plants.

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ihatereddit53 t1_iwrz6cs wrote

I mean, is water heavier than gasoline? How would it be different? Are we just talking efficiency like the other person? Because if so then its not the tech itself but that the tech needs to advance enough to be viable in that situation - still a propaganda article from a person with an agenda.

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Alis451 t1_iws0fmv wrote

> I mean, is water heavier than gasoline?

very much

>Hydrogen is measured by the kilogram. 1 kilogram is 1 gallon of gasoline equivalent (gge).

>It takes 3 gallons of water to make 1 kg of hydrogen

Water is 3.79 kg per gallon
Gasoline is 2.567 kg per gallon

water x3 = 11.37 kg of water to equal an equivalent amount of hydrogen energy as 2.567 kg of gasoline

or nearly 5 times the fuel weight

Usual Capacity is ~12 gallons of gas, so ~30kg (x5 = 150kg and a 36 gallon tank to hold it) basically trucking around a whole extra fat person 120kg = ~250 lbs, again not accounting for the electrolysis equipment, and the base energy you need to actually perform said electrolysis while on a vehicle.. it starts adding up fast.

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ihatereddit53 t1_iws2hc2 wrote

Soooo efficiency? Like i said?

Edit: and listen i appreciate the math and for sure i think u know what youre talking about but really its not usually the case that things are impossible, just that the right scenario hasnt been thought of and the technology hasnt caught up to the idea

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