[Stoves] Wood-fired masonry heaters - training

[alex english]

Dear Crispin,
About 20 years ago i built a Condar from instructions pulled from Norbert's
MHA website. I used it for the first ever particulate tests of a Tlud
stove/burner.

I brought it to our stove camp...was it last year.

Alex



On Aug 20, 2017 11:30 AM, "Crispin Pemberton-Pigott" <
crispinpigott at outlook.com> wrote:

> Dear Alex
>
> 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.
>
> 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.
>
> 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. ‎It was originally used in Oregon (Method 41) in
> the 80's.
>
> I have one somewhere. Want to try it?
>
> Regards
> Crispin
>
> Andrew,
> 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.
>
> One of the tricks was to flatten the start up burn rate with careful
>  attention to air flow.  No surprise, but needed proof.
>
> What I haven't seen, and may be one of their problem in the trade is the
> quantification of standby (no fire) losses.
>
> Already said to much:)
> Alex
>
>
>
>
> On Aug 20, 2017 8:39 AM, "Andrew Heggie" <aj.heggie at gmail.com> wrote:
>
> On 20 August 2017 at 05:31, Crispin Pemberton-Pigott
> <crispinpigott at outlook.com> wrote:
>
> > 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.
>
>
> Crispin are the reasons for the lower emissions  explained by the fact
> the burn  in masonry heaters is hot and fast with low excess air or is
> there more to it?
>
> Andrew
>
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