On 24/10/2012 4:56 AM, Crispin Pemberton-Pigott wrote:
Dear Alex
Crispin,
I get ?3 kW for that burn rate. Is that correct? Ideal for single pot
cooking.
That is close to a minimum, so not ideal for focused single pot cooking.
Works well for heating and cooking together.
To develop your comment to Richard about the air flow, cover or not, I
understand from Tom Reed that the superficial velocity is the marker
for a fire occurring systematically in the hopper or not. If the air
flow through the fuel is above some limit, the heat will not rise in
the hopper. Yes?
Pellets allow for a very even or consistent flow of air with no
channeling. This does cool the pellets but at this SV (superficial
velocity), without the concurrent pellet flow, the fire would creep up
into the fuel supply, towards the air. I suppose there is an SV that
would extinguish the fire. The pressure drop across the fuel at this
burn rate is around 0.02"WC.
It may not change much at higher burn rates. There are four air
introductions, under chimney 'suction' if one is changed the others also
change. I use a funnel in funnel approach which limits the pellet column
depth for pressure drop and allows a much larger bin above. This also
buts a brake on thermal conductivity through the structures. The larger
bin could have a sealing lid. In fact I use a lid to reduce air flow,
SV, when burning wood chips.
I like SV because it allows me to throw around technical terms
superficially and not include numbers:)
Alex
Regards
Crispin
**
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