[Stoves] Another high performance stove located

Wed Nov 11 01:41:42 CST 2015

Alex:

It looks like the O2 reference value is 13% which unties one knot. See line 938.

That would be a European standard dilution if I recall it.

Your CO/CO2 ratio was 0.01% (approx.) after the adjustment at minute 11. Up and down a little bit.

I don’t have a quick way to convert the concentration to something useful for the spreadsheet because it is pre-calculated.

The gas had a density of 1.322 under ideal conditions. The EA was 65% when the CO was lowest.

The Stoichiometric air-to-oxygen demand ratio was 0.76 (I used Albasia pellets for that – close enough). Lambda at 65% EA is 1.41.

The volume of gas was therefore 7.62 cu m per kg. CO = 0.08 g/MJ of fire so that is really low. If the PM number is 33 mg/m3 (and the Reference value is 25?) the total is 251.5 mg per kg burned. At 17.2 MJ/kg that is 14.6 mg/MJ of fire.

Assuming the heat transfer efficiency to a pot (if it were cooking) was 50%, that gives 29 mg/MJNET. That is comparable to a Philips stove burning pellets, and it’s a compliment to you! I suspect most of that is ash, not from combustion. It is very obvious looking at the PM histogram that there is a peak of PM4 in the Philips’ emissions that is entirely ash.

If the PM number isn’t really 33 then redo the calc with the correct number.

So it is a really good burner, blows a bit of ash up the pipe, and produces very low CO.  Good on you.

Regards

Crispin

Crispin,

The data summary from the 15 minute test is below. There was some ups and downs associated with grate movement and primary air. I don't know the burn rate but 10Kw+/- is a reasonable guess. At its best the CO measured as low as zero and PM 21 mg/m3.

This stove is not a TLUD or a fan stove, but there is potential for fly ash to be a portion of the PM.

Alex

O2:

	10.6

%

COv:

	137

ppm

COn:

	131

mg/m³

erw. U COn:

	35

mg/m³

COn - U:

	0.096

g/m³

mStF:

	1.7

mg

mSt:

	33

mg/m³

mSt(O2):

	25

mg/m³

erw. U mSt(O2):

	9

mg/m³

mSt(O2) - U:

	0.016

g/m³

Volume:

	44.3

Nl

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