On 7/17/2017 6:52 AM, Rupert Boleyn wrote:
> 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.
>

	One of the unusual items about water is that freezing it makes it less dense
than the liquid form. So you need to keep it at about 4 degrees centigrade for
maximum efficiency.

	So cyrogenic storage of Sucrose (for example), may improve the hydrogen density
as well.

--
         Thomas Jones-Low
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