[Stoves] Request for help on TLUD operating data

[Crispin Pemberton-Pigott]

Dear Ron

 

I will send you the files separately. They are old but demonstrate the
principles. You can zoom the charts I think.

 

There is a small misunderstanding about the way the EA is calculated in a
chemically balanced manner.  The O2 content of the other gases is needed to
provide a substitute for the number ‘21’ or ’20.945’ in the EA formula.

 

I have been told several times this approach is novel. What it gives is the
actual oxygen availability in the fire that was present at any certain time.
This is calculated as if the oxygen came from air, even if it did not. The
normal calculation is quite misleading and was not really make for wood
burning. The formula used in the Testo (which is a good machine) is
incorrect. Calculating it wrong means getting the wrong advice on what to do
to perfect a burner.

 

The files are much too large to post to the list.

 

I have a small comment on your combustion formula from another message. It
is that the burning is not making CO2 (much) it is making CO and if the burn
does make CO2 it is reduced to CO (mostly) in the char bed. This affects
your calculated number of moles.

 

            4.  Do I understand that between the red and yellow vertical
lines that CO/CO2 is greater than 2%?  How large might that get?

 

The CO/CO2 ratio can reach 30% but more to the point I have tested stoves
that had a CO(EF)[O2=0%] of 130,000 ppm. That can only be reached in a stove
with heat driving the reaction, not from a fire. I can explain later if it
is important. None of these stoves are trying to make a high CO gas, they
are trying to burn it so it is not all that relevant a point. Don’t worry.

 

We look for stoves that can average below 2% CO/CO2 and some are well below
1%. Not all are TLUD’s remember. There is a crossdraft stove I have
mentioned before that is cleaner than all TLUD’s seen to date. It can also
be refuelled so I think there is a future in tilting the TLUD community 90°
in that direction.

 

:) 

Crispin

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