[Stoves] RE: Charcoal Stoves - measuring CO

[Crispin at newdawn.sz]

Dear Nordica

Thanks for the comprehensive description.

I read this a couple of times and want to clarify something:

>CO and PM "to cook" is the average of cold and
>hot start mass emission added to
>simmer.

So you actually get a cold start emission and a hot start emission and 
average them to yield a warm start (sort of) to rate the stove, then add the 
simmer which is presumed to be identical for both starts.  This is a 
reasonable rating method. and perhaps we could adopt it.  At least we are 
aware of how you are reporting it.

I wonder what we with CO meters can do to get a meaningful comparison here, 
particularly regarding CO produced during a cook. There is no way we are 
going to get particulate totals in the field - not at least for some time. 
The CO can be very useful to designers and we want to post meaningful 
figures.  Since you started reporting CO produced during a cook and the move 
towards a published standard (or target) we should get some agreement on how 
to get that number from a CO/CO2 meter.

As basically your computer is adding up a large number of CO and CO2 
readings, I don't see a problem doing the same things with a longer 
interval, say 1 or 2 minutes.

It is possible for one person to write down the CO, the fuel mass, the water 
mass and temperature every 2 minutes, though it is a struggle to do it every 
minute for more than 5 minutes!  There is a lot of hopping around when doing 
that in the field.

If I cold start and take readings every 2 minutes for the next roughly 1 
hour and 15 minutes, then do a hot start with readings every 2 minutes, that 
should provide information accurate enough to make a realistic comparison 
with your testing, agreed?

The two starts would be averaged and the simmer CO summed to get a total 
which gives a rating for the combination of the device+operator+fuel.

Best regards
Crispin



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