[Stoves] new article

[ajheggie at gmail.com]

On Thu, 17 Feb 2022 at 20:15, Crispin Pemberton-Pigott
<crispinpigott at outlook.com> wrote:
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> Dear Andrew
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> I read it a carefully in places and skimmed others. The salient conclusions are that there was no significant correlation between the amount of fuel burned and the indoor PM level. There was a correlation with the opening of the door to feed fuel.  That was a finding worth doing something about.

Yes, which is why I suggested opening the door slowly and re stoking
infrequently, from my observations what comes out is often fly ash and
yes disturbing something in my ash-dusty room does register as a peak
on the meter.

This is very easily demonstrated by looking at the cobwebs ;-). I have
considered  having a simple fan powered dust filter for the room.
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> A well designed stove doesn't emit anything when the door is opened. It pulls air in. They do not say that.

I wouldn't say my Morso 11 was poorly designed (other than the air
control mechanism being susceptible to jam with ash) but even with a
chimney that draws well the air path is such that smoke does get out
when the door is opened unless there is a good flame,
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> A missing part of the study is that they didn't not related occupation of the room to PM, whether there was a stove at all, and whether it was burning.   The measured values of PM are very low.  If you are measuring and discussing peaks (which they do because the averages are not very interesting) it is worth noting that walking across a carpet can create a peak of 200 µg/m3.

I think WHO consider anything above 25 µg/m3 high.
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> For comparison outdoor PM2.5 in Ulaanbaatar peaks at 3000, even 4000.  It is much cleaner indoors than out, undermining the idea that outdoor PM is always a source of the indoor air pollution.  UK homes are really clean indoors.
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You must visit sometime :-)

Good to chat Crispin.

Andrew