Quote:
Originally Posted by Stubby79
3.82 gallons of CNG @250 bar to equal the 33.40 kwh.
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Where did you get that data from ?
Quote:
Originally Posted by Stubby79
you have 26.23 kwh in your tank. (~2.3kwh/litre @ 250 bar - or 9.2 watt-hours per litre at 1 bar vs the 8.8 watt-hours per litre of our original math.
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Your equation is thus:
26,23 kWh = 11,35 litre x 2,3 kWh/litre @ 250 bar
26,23 kWh = 11,35 litre x 0,0092 kWh/litre (@1 bar) x 250 bar
26,23 kWh = 26,105 kWh so doesn't match, but it's close
Calculating it another way:
1 GGE = 3,587 m³ @ "standard conditions" (=250 bar ?)
33,4 kWh = 3,587 m³ @ 250 bar
33,4 kWh = 3587 liter @ 250 bar
33,4 kWh = 11,35 liter @ 250 bar x 316,0352
33,4 kWh/316,0352 = 11,35 liter @ 250 bar
0,1056 kWh = 11,35 liter @ 250 bar
11,35 liter x 0,0093 kWh/l @ 250 bar
That last calculation seems wrong (perhaps because standard conditions doesn't mean 250 bar ?) but I got a number of 0,0093 kWh which seems to be close to the 0,0092 kWh I got from the above calculation, so that may be the right number (it also almost matches the 9,2 watt you also calculated).
Recalculating:
11,35 litre x 0,0093 kWh/litre (@1 bar) x 250 bar = 26,388 kWh
So that's even worse than with 0,0092 kWh; with 0,00925 it gives:
11,35 litre x 0,00925 kWh/litre (@1 bar) x 250 bar = 26,246 kWh
That seems to be about the right figure ?
It would mean that natural/bio gas is about 3,083x more energy rich than hydrogen.