Saturday, June 21, 2008
The plug-in hydrogen hybrid, part 4
The problem is that you're trying to plug it in before the hydrogen generator instead of after. Put the hydrogen generator in your basement and you might have something. So here's a few calculations to find out what it is you might have.
Gasoline has an energy density of 34.8 MJ/liter, according to Wikipedia. Some math turns that into 132 MJ/gallon, to 36.6 kilowatt-hours per gallon. So if you were making the hydrogen at home from household current, your cost for the equivalent of a gallon of gasoline would work out to this:
Price of a "gas gallon equivalent" = (Cost per kilowatt-hour) * (36.6 kilowatt-hours per gallon)/(Generator Efficiency)
Don't forget to factor in the energy needed to compress the hydrogen into the generator efficiency. You'd want to generate the hydrogen and oxygen separately, since you'll need to compress it in order to carry enough hydrogen to make a difference. So if you're paying 12 cents per kilowatt-hour and your generator's total efficiency is 50% including the power needed to run the compressor, you'd be paying the equivalent of $8.78 for a gallon. By the way, you'd also be stuck with similar costs on the plug-in hydrogen hybrid, although your generator efficiency would be up because you wouldn't need to compress the hydrogen nearly as much.
Still not good, but bring the price of gas up and the efficiency up and you might have something...
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