Ok cost efficiancy...
Gasoline or hydrogen...
In terms of making it yourself...
I as in ME, must be able to do it.
Here and now...Not as in a oilshiejk.
Ordinary 95o gasoline is 14.33swe kr/L
ca... little over 2$ PER LITRE...
If my calc is correct thats about 8$/g
If you are going to make hydrogen yourself you are going to use electricity from nuclear, gas, solar, wind, coal, etc (As I stated before.)
So if you are buying energy for $0.09 /kWh, you are only going to get back whatever your efficiency is in your electrolysis. Industrial methods which
include heating to high pressure some hundreds of degrees centigrade are not feasible in your home.
You will (if you are lucky) obtain something nearing 50% efficiency. So right off the bat you are paying 18 cents per kWh. This doesn't include
storage, the materials needed, the chemicals used (for efficiency). Nor does it include the burning of hydrogen and conversion to mechanical or
- - - Let's say you are working under ideal conditions:
You are going to use 4 kWh to initially change 1 litre of water to 1358 litres of hydrogen. It's going to cost about $0.40 (sort of) but alas, you
have your 1358 litres of hydrogen gas now.
Now we check the energy density of hydrogen:
Hydrogen, gas (MJ/L) 0.01005
x1358 = 13.6MJ
Gasoline (petrol) (MJ/L) 34.2
So, you did your fancy hydrolysis and ended up with 13.6MJ for all the work you did. Now times your costs by 3 to get the same out of a litre of
Even under perfect conditions it is costing you $1.20, and we haven't even factored in efficiency loss, catalysts cost, etc.
I think your costs are going to be in fact a lot higher. At least x2.
You see, a "gram" of gasoline is arbitrary. It means nothing without an energy equivalent.
You can search out other threads where myself and others on the forum have debated the feasibility of hydrogen alternatives. And there are many smart
people working on the same in the "mainstream". Even BMW.
But if you truly think it's as easy as dipping two electrodes into water and suddenly you have unlimited hydrogen power for the rest of your life, you
really need to stop listening to whoever you are getting your information from.
edit on 17-11-2013 by boncho because: (no reason