[Stoves] Fuel Testing

[CEDESOL Foundation lists]

Frank,

While it is possible that you already have seen the information Tom has 
directed you to, your comments to Crispin about the error of using the 
weight of the fuel ( in Crispin's case it was grams) as a determining 
factor in the equation to determine stove performance piques my curiosity.

So far, all of the test protocols presented internationally use the 
weight of the fuel before, and the weight of the fuel afterwards and 
left over carbon (being fuel transformed) as factors in the equations. 

What measurement are you proposing? 

How should the testing be different than the already internationally 
recognized standards and their variations?

thanks
David Whitfield

Tom Miles wrote:
> Frank,
>
> It occurred to me that this is all done for you in the SHELL FOUNDATION HEH
> PROJECT WATER BOILING TEST calculation sheet. Pick your species (from 78)
> and fuel mositure and it will give you a net heating value. There are also
> sheets for the fuel moisture. It's an excel spreadsheet abvailable at UCB
> http://ehs.sph.berkeley.edu/hem/page.asp?id=42 Or see the links at:
> http://ceihd.berkeley.edu/heh.stove_perf_eval.htm or
> http://bioenergylists.org/en/performance
>
>
> Also, study the WBT itself and the sources - Baldwin etc. for fuel
> characteristics and how they dealt with mositure in the fuel. It will take
> you through the net heating value calculation. Also look at Visser and
> Prasad's site, Cookstove.net http://cookstove.grensy.info/
>
> Tom Miles
>
>
> -----Original Message-----
> From: stoves-bounces at listserv.repp.org
> [mailto:stoves-bounces at listserv.repp.org] On Behalf Of frank at compostlab.com
> Sent: Sunday, October 01, 2006 12:05 PM
> To: stoves at listserv.repp.org
> Subject: [Stoves] Fuel Testing
>
> Dear Stovers,
>
> I'm about to present my 'introduction' formula (in Excel) for the fuels
> program.  Only thing left is running a few examples of different fuels
> through the program. 
>
> Also; There is a part I would like to add but do not know how and would like
> some help. I have the calculations for carbon densities. I think I would
> like to subtract from that the carbon needed to remove the water from the
> fuel. 
>
> My questions are: If you use dry wood to boil a pot of water and determine
> the energy produced. Then take the same type of wood and soak into it, say,
> 100 mls water and repeat the test is some of the energy in the wood reduced
> because of the water or, because the wood will dry during the fire and the
> carbon later used, it doesn't make a difference?  If some of the energy
> (carbon) in the fuel is needed to first remove the water (cooled to make
> steam) is there an estimate of the amount of carbon 'wasted' to remove a
> gram of water? Am I thinking about this in the right way?
>
> Thanks
>
> Frank
>
> www.compostlab.com
>
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