[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

 

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