[Stoves] Stoves Digest, Vol 97, Issue 3

[Norbert Senf]

Geoff, it all depends on your definition of "emissions".

In dense urban settings, the focus is often on particulate matter (PM)
emissions. If you only look at PM, even a certified domestic woodstove
("double burner"), is going to have many, many times higher PM emissions
than a modern diesel lorry with a mandatory diesel particulate filter. Or
even without a particulate filter.

We (Masonry Heater Association) have done quite a few stove particulate
measurements over the years. The current EPA limit in the U.S. for
certified stoves is 4.5 grams of PM per hour, going down to 2.5 in a few
years. This is a standardized laboratory measurement, and field trials in
New Zealand have demonstrated that field numbers tend to be about 3X
dirtier.

On pellet stoves, we've measured an average of around 1 gram PM per kilo of
dry fuel, which also seem to be the lower limit. For cordwood in domestic
masonry heaters (high mass heat storing appliance with a fixed, optimized,
burn rate) the lower limit seems to be around 0.5 g/kg PM.

The g/h and g/kg units are equal when the burn rate is 1 kg/h, which is the
average burn rate in the US for domestic stoves.

Norbert

On Tue, Sep 4, 2018 at 2:00 PM, <stoves-request at lists.bioenergylists.org>
wrote:

> Message: 1
> Date: Tue, 4 Sep 2018 14:01:29 +1000
> From: Geoff Thomas <wind at iig.com.au>
>
> I find it hard to credit that a double burning wood stove emits three
> times more than a lorry, - unless the Lorry is turned off, - then perhaps.
> However, the main thing is that if the heat is provided by electricity,
> mostly generated by coal, then the coal emissions will be as bad as the
> lorry when running, coal generally achieving 30+ percent efficiency, the
> wood stove conspicuously more than that, - just the burning of the smoke
> gas is 30%, besides, the coal stays in the ground, whereas the wood would
> otherwise break down and return it?s  carbon dioxide to the atmosphere if
> not burned, so a wood fire is essentially carbon neutral, whereas coal
> fired electricity is certainly not.
> That a soul less electric heater is not as nice as a wood fire is an extra
> feel good for the wood fire carbon neutral enthusiast.
>
> Of course the wood fire should be certified double burning, - smog issues
> to one side it will give out much more heat than the illegal one, so use
> less wood, - wood is not cheap, so it is to the benefit of the stove owner
> to have a compliant stove in the long run, - not enforcing regulations by
> the Govt bodies is the culprit in this situation, possibly Climate deniers
> are influential in those govt bodies, - that sort of insanity should be
> treated by putting those govt. officials to work - in a Coal mine.
>
> Geoff Thomas.
>



-- 
Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com
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