[Stoves] Top lit updraft combustors

[Norbert Senf]

Thanks, Steven. That's great.

Our experience with domestic-scale cordwood in masonry heaters (50 lb
batches @20% moisture) is that the "boiling of water" or latent heat loss
is typically in the 13% range, using the Condar spreadsheet HHV
calculation   heatkit.com/docs/condar.PDF

On Mon, Dec 18, 2017 at 11:24 AM, Law, Steven (MOECC) <Steven.Law at ontario.ca
> wrote:

> Hello all,
>
>
>
> I have finally completed a proper study of reporting efficiency using LHV
> and HHV. It was much more complicated than I thought it would be, and now I
> know why this is such a mess!
>
>
>
> Just remember that HHV is always less than LHV, and anything above 100% is
> WRONG and cannot possibly conserve energy or mass and is therefore
> unscientific.
>
>
>
> When an LHV efficiency from Europe is 90% (which is actually a reasonable
> number), the HHV efficiency is a maximum of 84% or usually less, depending
> on the moisture content of the wood fuel and is more typically 75-80%. This
> is important, HHV efficiency is extremely dependent on fuel moisture
> whereas LHV is less so, but only for non-condensing boilers.
>
>
>
> Again, this is for non-condensing combustion devices, because when you
> throw in high efficiency condensing heat recovery all the numbers get
> screwy and LHV no longer applies. Everything has to be re-done for
> condensing boilers and only HHV can be used, I will repeat LHV cannot be
> used for anything where condensation of the flue gas occurs in the heat
> recovery device!
>
>
>
> I think I have a proper engineering calculation procedure mapped out to
> deal with all of the above issues and I will begin to roll this out a
> little bit at a time since I need to review it again before sending
> anything out. It is a scientific method that is based on conservation of
> mass and energy and I hope that this new calculation procedure will help to
> solve some current problems in the industry.
>
>
>
> Best regards, Steven
>
-- 
Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com
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