Chrispin,
Thanks for the thoughful response.
--
Quoting Crispin Pemberton-Pigott <[email protected]>:
Dear Paul
Coal is compressed biomass.
Yes it is. And biomass is simply sunlight transformed by plants.
Let's not be simplistic about this. The Silver is a fossil fuel
burner. And coal and biomass are very distinct as fuel, regardless of
their origin from sunlight plus C and H and O and a bit more.
And your information leads me to have little interest. ($200, heavy,
high-internal heat would pyrolyze biomass in perhaps irregular ways,
nobody is using it with biomass - because it is not intended for
biomass and the Turkish users have learned that lesson well)
So, let's not get excited as if this recognition of a stove from
Turkey will alter the past, present or future of TLUD cookstoves.
TLUD stoves (as a NAME, not as a process) have characteristics that go
beyond top lit and updraft, and the name refers to devices that use
biomass, not fossil fuels.
In my opinion, the "Silver" unit is a very nice distraction from all
the work being done on biomass burning TLUDs and other
micro-gasifiers. I hope that someone spends a few years full-time
with this (and related) coal-burning technologies and makes some great
advances. But as it stands now, the discovery or re-discovery of this
Turkey product will have minimal impact on the progress needed for the
Global Alliance for Clean Cookstoves.
I can hope that someone will show that I am incorrect.
Paul
--
Paul S. Anderson, PhD
Known to some as: Dr. TLUD Doc Professor
Phone (USA): 309-452-7072 SKYPE: paultlud Email: [email protected]
Good explanation and thanks for the photos. Certainly seems like a
reasonable heater and stove.
It has problems which are easily rectified. The casting quality is really
high.
1. I will distinguish the "Silver" stove based on it being a coal burner.
It should be able to burn any really dense fuel. If it was small enough, it
might do with small pellets.
I believe the Silver is substantially larger in diameter of fuel chamber
than is John's.
It is taller and larger, for a total of about twice the maximum capacity,
however it is not the smallest model. I tested the middle-sized one for the
reason that it was the smallest one that has a round hole on top to accept a
wok.
2. In what way would the Silver NOT be accomplishing what we all seek
Price and availability are issues, plus the tweaks that will be need to make
it a super stove. It is nearly there. Rumour has it the price is in the $200
range.
...appropriate for Mongolia or even the High Veldt of South Africa where
coal is abundant
Well coal is used if far more places than that. Hundreds of millions of
people cook and heat with coal from Eastern Europe to Vietnam.
3. This Silver stove needs further study, meaning access to the devices.
We want to see and know that the top-ignited fuel does create a migrating
pyrolysis front (MPF for short, not as a name).
I don't see that micro-classifying it is important. It is just another batch
loaded TLUD. It might even work well with dung because it is large enough to
generate meaningful heat.
Much more about its emissions needs to be promptly known and, if low, be
recognized.
The emissions are about 99% lower than the baseline stove, somewhat higher
than the (cheaper) GTZ 7.5 which is the only other stove that burns in that
category.
4. Would this Silver unit function with dry biomass? If not, why not.
The main reason would be the overheating of the chamber. I suspect that as
it gets so hot there would be over-running gas generation if thermal
conductivity turns out to be too high. It is not a big issue in that it is
not advertised or intended as a wood stove anyway.
And if successful, why does it take until 2011 to recognize this, but NOT
use it with wood anywhere?
You only find what you are looking for, perhaps?
Have the 53 years of users been somehow missing such an observation?
Well it certainly was not missed in Turkey!
Other than the fuel dumping mechanism (which is integrated to the grate
shaking mechanism) there is nothing special about it. We have an issue with
it (like all batch stoves) which is that it can't be refuelled when it is
hot without creating massive smoke. It has to be cooled first. Will people
wait??
Simply turning it upside down to made a bottom lit downdraft stove would
cure that and might even reduce emissions further. This disadvantage there
is the cooking efficiency drops. For space heating it is looking like a
no-brainer.
Regards
Crispin
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