<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1256">
<meta content="text/html; charset=utf-8">
</head>
<body>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
Dear Norbert</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
<br>
</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
The readings were matched several times. I had not done a calculation of the total mass per kg. I think we can assume the EA was low. The highest I ever measured was 17 g/m^3 which was for a stove claimed to be 'improved'. That level was temporary, not sustained.
The worst baseline stove measurement was about 8g/m^3 (undiluted).</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
<br>
</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
We normalize to 0% O2 in all cases but I can't guarantee that JICA did. I recall they use 11% or thereabouts. The fact that people use different normalizations is why we always use 0% (undiluted for all reports).</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
<br>
</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
Obviously the coal has nothing to do with these terrible numbers. The same coal in a crossdraft stove produces so little PM it is hard to detect it against the background ýeven when the background is low. </div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
<br>
</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
In some respects the approach to improving ambient air quality is confused with misconceptions. </div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
<br>
</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
Regards </div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
Crispin </div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
<br>
</div>
<div style="width:100%; font-size:initial; font-family:Calibri,'Slate Pro',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; background-color:rgb(255,255,255)">
<br>
</div>
<br>
<div>
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">Andrew:</div>
<div class="gmail_quote">Yes, I was thinking about this after our previous exchange.<br>
</div>
<div class="gmail_quote">I'd guess there is no fan on your device. It should be easy to check if there is a flow through the<br>
</div>
<div class="gmail_quote">intake orifice.<br>
</div>
<div class="gmail_quote">It should behave more like a smoke detector - the air has some degree of "cloudiness"<br>
</div>
<div class="gmail_quote">and it doesn't matter if the air is moving or still.<br>
</div>
<div class="gmail_quote">With a dilute mixture and measurement of individual or cumulative scattered light "hits" on a
<br>
</div>
<div class="gmail_quote">sensor, it is related to particle concentration in the air which is unchanged by velocity.<br>
<br>
</div>
<div class="gmail_quote">For the dilution scheme that I described, I had forgotten about this. You'd actually need to<br>
</div>
<div class="gmail_quote">add a small fan if you wanted to try this approach, in order to establish a flow that can be diluted.<br>
</div>
<div class="gmail_quote"><br>
</div>
<div class="gmail_quote">Crispin:<br>
</div>
<div class="gmail_quote">Earlier you mentioned a flue gas measurement of 30,000,000 ug/m3 PM in Ulaanbaatar. That converts to roughly<br>
</div>
<div class="gmail_quote">350 g/kg, or more than 1/3 of your fuel leaving the stack as PM (normalized to 13% O2), way off the map of anything I<br>
</div>
<div class="gmail_quote">have ever seen or hear of. I'm not really familiar with coal or high fly ash, so can't hazard a guess - seems almost impossible.<br>
<br>
</div>
<div class="gmail_quote">Norbert<br>
</div>
<div class="gmail_quote"><br>
</div>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex">
<div>Message: 2<br>
Date: Thu, 13 Sep 2018 09:30:53 +0100<br>
From: Andrew Heggie <<a href="mailto:aj.heggie@gmail.com">aj.heggie@gmail.com</a>><br>
To: Discussion of biomass cooking stoves<br>
<<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.<wbr>org</a>><br>
Subject: Re: [Stoves] Personal Particulate Monitor<br>
<br>
I've made the subject a bit more appropriate, comments below:<br>
<br>
<br>
</div>
(snip)<br>
<div>> I doubt whether the flow speed through it would affect the particle concentration, ie if you<br>
> put a sampling tube on it.<br>
<br>
This confuses me somewhat, surely to measure concentration one needs<br>
to know how much air is passing the sensor and then count the light<br>
reflected off particles. or is there another way of knowing a<br>
concentration? I thought perhaps it assumed the fan drew a fixed<br>
volume per second and then the reflections were counted and calculated<br>
as a mass in that volume. If a restriction from a tube reduces the<br>
flow then a smaller volume passes but the sensor still counts the now<br>
lesser number of reflections, giving a lower reading??<br>
><br clear="all">
</div>
</blockquote>
</div>
<br>
-- <br>
<div class="gmail_signature">Norbert Senf<br>
Masonry Stove Builders<br>
25 Brouse Road, RR 5<br>
Shawville Québec J0X 2Y0<br>
819.647.5092<br>
<a href="https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.heatkit.com&data=02%7C01%7C%7C245efb9649404a1bf1b908d619aa2f07%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636724616050367720&sdata=vaO1X9Lxc8TYlQJyLulXkMxkzNPWDcnnVXkJ%2Bv2jZdk%3D&reserved=0" originalsrc="http://www.heatkit.com" shash="DY7MN3Kzt2VpSU9h+TcSCcL32Mifd56EHHNbeQiqs46TSqcSvy+w4UgJr9Q9WqIjnQugGiRueJvoTwL2Q0/V27UITYuvSmlLqTIBPq9ejhi9kH4enjy3TMuzuMMoOIudIqb8Eexytzs8TBW0co5zkxCibPjL7Le6EpRzD4jjoDU=" target="_blank">www.heatkit.com</a></div>
</div>
</div>
</div>
</body>
</html>