[Digestion] Accurate Biogas Yeild

[Vianney Tumwesige]

Thank you Paul for the insight. Let me know whenever you post an example
(and the spreadsheet calculator) on the lovely Biogas wiki.

Have a great day, Love your Albert Einstein quotations

On Tue, Nov 23, 2010 at 6:49 AM, Paul Harris <paul.harris at adelaide.edu.au>wrote:

>  G’day Vianney et al,
>
>
>
> I think it was mentioned in this list not that long ago that a “floating
> drum” storage offers a good, simple way of measuring gas production. You
> just record the change in height of the drum and volume of gas = area *
> height (area of a circle = pi Dsquared/4 or pi Rsquared and there are 1000
> litres in a cubic metre). If you want more accuracy use a small diameter
> drum with greater height to get the necessary capacity. Pressure and volume
> of any gas are related by p1v1=p2v2, where p is pressure, v is volume and 1
> represents the initial conditions and 2 is the final conditions. Mass and
> volume are related by density, where Density = Mass/Volume and the density
> of biogas is about 1.18 kg/m3. The easiest way to develop the pressure
> needed for burners etc is to add weight to the drum (bigger diameter – more
> weight, since Pressure = kg*9.8/sq.metres) and if you measure “pressure” in
> mm of water you need to know Pressure (Pa) = 9.8 *Height (mm).  I think that
> should let you calculate anything you need and I hope you understand the
> “useful” metric units I have used. I will put an example (and possibly a
> spreadsheet calculator!) on the biogas wiki.
>
>
>
> Happy Digesting,
>
> HOOROO
>
>
>
> Mr. Paul Harris, Room S116b, Waite Main Building Faculty of Sciences, The
> University of Adelaide, Waite Campus, PMB 1, Glen Osmond SA 5064 Ph    : +61
> 8 8303 7880      Fax   : +61 8 8303 4386
> mailto:paul.harris at adelaide.edu.au <paul.harris at adelaide.edu.au>
> http://www.adelaide.edu.au/directory/paul.harris
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> *From:* digestion-bounces at lists.bioenergylists.org [mailto:
> digestion-bounces at lists.bioenergylists.org] *On Behalf Of *Vianney
> Tumwesige
> *Sent:* Monday, 22 November 2010 5:41 PM
>
> *To:* For Discussion of Anaerobic Digestion
> *Subject:* [Digestion] Accurate Biogas Yeild
>
>
>
> Hello AD friends,
>
>
> Hope everyone is fine. Back to business, how would you measure the biogas
> yield of a system? LPG is measure in Kg and the user can tell how much gas
> he consumes. Biogas being stored in a volume (liters or cubic meters) makes
> it hard to relate to pressure (of the biogas).  Have you been able to find a
> system pressure system good for Africa?
>
> Thanks
>
> --
> Vianney Tumwesige
>
> Director - Green Heat (U) Ltd  [image: Picture]
> P.O. Box 10235
> Kampala-Uganda
> 256 (0) 71 237 9889
>
>
> "The more people are self sufficient in cooking fuel, the more personal and
> financial freedom they have." - Emma Casson
>
>
>
>  <http://trustvianney.wordpress.com/>
>
>
>
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> for more information about digestion, see
> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>
>
>


-- 
Vianney Tumwesige
Director - Green Heat (U) Ltd  [image: Picture]
P.O. Box 10235
Kampala-Uganda
256 (0) 71 237 9889

"The more people are self sufficient in cooking fuel, the more personal and
financial freedom they have." - Emma Casson


 <http://trustvianney.wordpress.com/>
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