[Stoves] Improving Thermal Efficiency (TARP-VE)

[Dean Still]

Hi Alex,

As you say, getting super clean results from a TLUD requires a prepared
fuel like good gas for a car. Tuning a TLUD or another type of stove is
straightforward under an emission hood including height of flame, air flow,
all the gas and smoke going into the flame, many  variables. We're starting
to write a book describing how to make Tier 4 stoves with "how-to"
descriptions of the designs: TLUD, Side Feed Fan, Tom Reed Fan, Natural
Draft Improved Mixing, etc. Lots of testing to do (one or two years). Great
to be bashing around in the brave new world of Super Clean. We owe a big
thanks to John Mitchell, Jacob Moss, Brenda Doroski for pushing forward
with the IWA.

Thanks Tom Reed/Ron Larson/Paul Anderson/Paal Wendelbo for starting the
technical revolution. In the lab Tier 4 is pretty easy for CO, very hard
for high power PM, and achievable with everything just right for thermal
efficiency (45%). Then into the field to see how well the stoves do in
reality!

Best,

Dean

On Sun, Jun 3, 2012 at 7:28 AM, Alex English <english at kingston.net> wrote:

> Hi Dean,
> So this begs two questions;
> 1.  How does a cook 'tune' the TLUD?
>
> I would assume that tuning means adjusting air settings for levels of
> excess air and perhaps some mixing optimization.
> With processed solid fuels, 'tuning' can  approach the same combustion
> quality territory as  liquid fuels. I can envision an engineer 'tuning' the
> design for a given homogeneous fuel, and a cook operating the TLUD stove
> according to a manual of instruction. However TLUDs are being promoted for
> use with a variety of fuels for which tuning may imply a fairly wide band,
> with more excess air.
>
> Even with wood pellet fuel I could get variable deposits ( from near zero
> to significant) on PM filters while exit gasses still looked clear and
> smoke free. Excess air and there for peak mix temperatures seemed to
> correlate well with the filter deposits.
>
> I look forward to seeing the full range of data for TLUD PM with a range
> of air settings, including during 'data blind' cooking tests where the
> operator has the average users level of instrumentation.
>
> 2.  What fuel specifications are required to get TLUD to operate
> consistently in the field at Tier 4 emissions levels?
>
> Staying tuned,
> Alex
>
>  When you use a clean stove, like a tuned TLUD, the filter stays white
> after boiling and simmering the water.
>
>>
>> Best,
>>
>> Dean
>>
>>
>
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