Martin,
Where would you place the rotometer? Most fans / blowers create
back-pressure (and back flows) that do not go to the fuel stack?
I do not have experience with nor possession of a rotometer. For this
I also need guidance. It would be nice to include this in the
experiments at Aprovecho Stove Camp this summer. And there we can
also do experiments with different layers of fuels.
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 5/7/2013 2:22 AM, Boll, Martin Dr. wrote:
Paul,
I do not expect to get much energy, but the performance would be interesting.
Even if there is different rate of mixture in different layers of the TLUD, you
could get different outputs, and do that in mind the needs of the
cooking-proceedure.
Upper layer charcoal, to get ignition without smoke, than fuel with few
charcoal as space-filler, than charcoal with (one have to experiment the rate
of fuel/charcoal) fuel-bits, possibly a sort of raw saw-dust. And at the bottom
just some charcoal to finish without smoke.
If you allow only the amount air liters per minute to pass the rotameter and so the TLUD-primary (naturally you have to separate primary from secondary.air)
you know exactly the rate of air. You have to calculate the free space in order
to get the real air-speed in this area.
I think even if that is naturally not the true surface-speed on the fuel, it is
a good number to deal with.
Even if you don't have the right number, you could calculate from one
good-working TLUD to another which has a different Square-flat.
Mind: The high of the fuel stack does not count, because the flow-rate is
limited by the rotameter and not by the fuel-stack, because you work with a
relatively high pressure and the flow is limited by the high resistance
regulated by the rotameter.
Little bit in hurry-.
Regards
Martin
Am 07.05.2013 um 04:35 schrieb Paul Anderson <[email protected]>:
Martin,
Concerning "space fillers", I and probably others have put wood chips and small
pieces into TLUDs where there is otherwise too much space between the main biomass fuel
pieces. Yes, the chips do pyrolyze.
But my point is that making small pieces of biomass for filler can be
difficult. But using char pieces from previous TLUD batches is very easy.
But just do not expect to get much energy from the charcoal filler, because it
has already been pyrolyzed.
Concerning your comment/question about measuring the flow of primary air, it is
not sufficient to measure characteristics of the fan/blower/pump because the
holes in the bottom of the TLUD are intentionally small and the fuel is
intended to (expected to) block some of the flow. What is needed is to
measure the flow INSIDE the fuel cylinder, such as in the bottom 2 cm of fuel.
But how to do that?
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 5/6/2013 3:56 PM, Boll, Martin Dr. wrote:
TLUD-ers turn it as you want;
Charcoal as space-filler means __somehow__ that "mixed fuel" is used in a TLUD. From
that aspect it is a "hybrid-fuelled" TLUD.
Change the ratio of the "hybrid-fuelled" TLUD to: wood-pieces as space-filler
(by charcoal-packing). Run this different mixture and look.
Who did this already? Interesting to hear about.
- It would be as well interesting to know the difference in performance between
test-runs with natural draft and with forced air.
Even by that different ratio, the burn can be stopped after outgassing, to get
as final result charcoal.
- Hybrid-fuelled TLUDs would get probably a better quality of resulting
charcoal ( Frank, mentioned that as important difference for bio-char)
P.S. We could stop guessing about the amount of more or less _primary air_
(caused by the minimal pressure of a fan or natural draft in different-dense
TLUD-packages), and make an exact air-dosage by a rotameter, or less expansive
and simpler by an aquarium-air-pump.
Martin
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