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Dear Alex</div>
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Standby: I understand that now they have either automated or manual shut-off of all air entry when the fire is done. Once that happens there is a negative pressure throughout the system and the gas flow stops. The heat continues to radiate and convect from
the thermal mass, be it stones or bricks. </div>
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Norbert is the head of the MHA technical committee and is a big advocate of the Condar PM measurement system which he has shown definitively gives results with only a fifth of the uncertainty of the EPA dilution tunnel system. </div>
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For measuring modern clean stoves, this is a significant difference. I can't say a significant 'advance' because the Condar is older than the dilution tunnel method. ýIt was originally used in Oregon (Method 41) in the 80's.</div>
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I have one somewhere. Want to try it?</div>
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Regards </div>
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Crispin </div>
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<div>Andrew,</div>
<div dir="auto">Norbert Snef, who used to read this list, is the guy to answer your question. I would just point out that he and others involved took a technical approach. All ideas had to be tested and produce data that proved the improvement was valid. From
what I understood few did. However I seem to recall that this approach did generate an evolution of the designs that had lowest emissions, over what must be close to three decades of testing.</div>
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<div dir="auto">One of the tricks was to flatten the start up burn rate with careful attention to air flow. No surprise, but needed proof.</div>
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<div dir="auto">What I haven't seen, and may be one of their problem in the trade is the quantification of standby (no fire) losses. </div>
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<div dir="auto">Already said to much:)</div>
<div dir="auto">Alex</div>
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<div class="gmail_quote">On Aug 20, 2017 8:39 AM, "Andrew Heggie" <<a href="mailto:aj.heggie@gmail.com">aj.heggie@gmail.com</a>> wrote:<br type="attribution">
<blockquote class="quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
On 20 August 2017 at 05:31, Crispin Pemberton-Pigott<br>
<div class="quoted-text"><<a href="mailto:crispinpigott@outlook.com">crispinpigott@outlook.com</a>> wrote:<br>
<br>
> They are developing clean-burning wood-fired home heating and baking systems operating on the retained heat principle. They have emissions per kg or MMBtu well below current EPA targets. There is a lot to be learned from them about this application of bioenergy.<br>
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Crispin are the reasons for the lower emissions explained by the fact<br>
the burn in masonry heaters is hot and fast with low excess air or is<br>
there more to it?<br>
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Andrew<br>
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