[Stoves] Thermal efficiency
Crispin Pemberton-Pigott
crispinpigott at gmail.com
Tue Apr 17 17:24:02 CDT 2012
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20120418/26db1a67/attachment.html>
More information about the Stoves
mailing list