Re: [TML] Shipping Fuel Densely: Best way to do it? Rupert Boleyn 17 Jul 2017 10:52 UTC
On 17Jul2017 2201, Tim wrote: > On Mon, Jul 17, 2017 at 04:32:52PM +1200, Rupert Boleyn wrote: >> Thus a DTon (14m^3) of each has a following characteristics: >> Mass Mass of Hydrogen >> Glucose 1.540 x 14 = 21.560 0.0671 x 21.560 = 1.45 tonnes >> Fructose 1.694 x 14 = 23.716 0.0671 x 23.716 = 1.59 tonnes >> Sucrose 1.587 x 14 = 22.218 0.0648 x 22.218 = 1.44 tonnes > > Solid methane is pretty decent. Just more than 25% of its mass is > hydrogen, and it has a density just under 500 kg/m^3 at 70 K, for a > total of 1.75 tonnes hydrogen per dton. It should also be extremely > common on outer system bodies. At liquid hydrogen temperatures, its > density is slightly greater at 520 kg/m^3, for a total of 1.83 tonnes > hydrogen per dton. That does look pretty good, and cyrogenic storage in interstellar space will be pretty easy, so the temperature isn't really a problem. Note that I didn't go through all the common biological sugars, fats, and oils to see if some were better than sugar and olive oil. In fact the olive oil was a sudden thought just before I was going to hit 'send' on the sugar stats. FWIW glycerol runs at about 1.55 tonnes of hydrogen per DTon, as do many triglycerides. -- Rupert Boleyn <xxxxxx@gmail.com> Chief Assistant to the Assistant Chief