[Stoves] Thermal efficiency

Alex English alex.w.h.english at gmail.com
Tue Apr 17 17:30:14 CDT 2012


What was the fuel?
On 2012-04-17 6:24 PM, "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
wrote:

> Dear Friends****
>
> ** **
>
> We have been conducting a series of thermal efficiency tests on three
> stoves, more than 50 altogether, and I am sharing a consistently good
> result from two of them. Here is one:****
>
> ** **
>
> Thermal Efficiency****
>
> 66.7%****
>
> 67.1%****
>
> 67.1%****
>
>  ****
>
> 67.6%****
>
>  ****
>
> ** **
>
> That was achieved at about 2 kW power level.****
>
> ** **
>
> The other was at a similar level:****
>
> ** **
>
> Thermal efficiency****
>
> 73.0%****
>
> 71.3%****
>
> 70.8%****
>
>  ****
>
> 69.9%****
>
>  ****
>
> ** **
>
> I am pretty sure I have not seen this for a high power level before. Very
> low power can achieve high efficiencies but it is not a very useful heat.
> With these two we are seeing 1.4 kW absorbed into the pot. Pretty
> impressive.****
>
> ** **
>
> I will ask permission to share the data for what will be 69 tests in all.*
> ***
>
> ** **
>
> One set involved repeating a test done in another country with a similar
> though not identical protocol. The result was within 2.3% so the approaches
> are getting comparable results. Given that the fuel was not identical,
> altitude difference and not exactly the same pot, the difference is
> negligible.****
>
> ** **
>
> Other lab (recalculated to correct a minor error)****
>
> 69.4%****
>
> 69.4%****
>
> ** **
>
> SeTAR Lab with a slightly smaller pot and 1.1 litres less water in it****
>
> 66.7%****
>
> 67.1%****
>
> 67.1%****
>
>  ****
>
> 67.6%****
>
>  ****
>
> ** **
>
> It is nice to see this performance level achieved consistently. We are
> seeing a consistent performance variation with pot diameter: bigger is
> better.****
>
> ** **
>
> Regards****
>
> Crispin****
>
> ** **
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
>
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://www.bioenergylists.org/
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20120417/c7c2fc3f/attachment.html>


More information about the Stoves mailing list