[Stoves] Biogas backpack

[Ronald Hongsermeier]

Dear Crispin,

On 09.01.2012 19:02, Crispin Pemberton-Pigott wrote:
>
> Dear Ron
>
> Good to hear from you in the new year.
>
> *>*I think you misunderstood the article. The bag is only for 
> transport and temporary storage. They take the empty (and some dung) 
> to a biogas producer, get it filled and go home to cook with it. It is 
> supposed to be about a day's cookin' worth.
>
> I am with David House |www.completebiogas.com |on this one: it is a 
> portable digester with nothing but gas in it! J
>
> He writes, “It's actually a gas bag, not a digester. Even so, it's an 
> excellent innovation, and a worthy addition to the armamentarium, 
> wherever it can serve as a means of transport in connection with a 
> large digester near any large population.
>
> And as well, from my point of view, it's also a bit ironic, since the 
> very sturdy bag, selling for ~$US38, could actually /be/ a digester if 
> it had two additional pipes (an inlet and an outlet), and further that 
> since it's about a cubic meter in volume, it would produce about a 
> cubic meter of gas every day, if fed and kept warm.”
>
That may well be, but, not having seen the bag, it may well need some 
additional features apart from two pipes. You'd have to get solid 
materials in and out, etc. Also, I think that his proviso: "...wherever 
it can serve as a means of transport ... large digester ... any large 
population." is overwrought. When compared with walking 10 km with 20 or 
more kg on your head, a 3kg bag is gonna add up to 30 € pretty quick. 
I'm not dissing the idea of making a digester of that size, just have 
the impression from the relative clause that he is degrading the 
usefulness of the idea unnecessarily.



> I think David is working on a bag digester himself. The transport of 
> gas is interesting. If it turned out to be attractive as a cooking 
> fuel (and delivery system) the users would perhaps be convinced to 
> install their own systems. I am not convinced that a minibus would 
> accept the gas ‘package’ without fear or charge.
>
I think they limited the size to keep it a relatively manageable size.
>
> It is a lot lighter than a load of wood and the walking distance might 
> be less. I wonder if a tire on a rim might be as good, and could be 
> pumped by hand. Will a tire hold a useful volume of gas if hand pumped?
>
Even if the walking distance was more, one would not have the same 
fatigue. i think you'd have to work pretty hard to compress a whole m^3 
into anything like a regular tire-- and a tractor tire with rim would be 
more taxing to manage than a load of firewood on one's head. ;-) If this 
was done in cooperation with schools, they could even get the transport 
with larger school children on the way home from school, delivery before 
school, pick up the bag and go home after school. hoping you're doing well.

regards,
ron
w
h


> Regards
>
> Crispin
>
>
>
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