Jock (and especially Michael):
I conclude from this mode of operation, that very little char is obtained
in their normal mode of operation. I’d be interested in how much char they
could get from a maximum single charge (that might be 10 pounds?), if they
stopped operation when the pyrolysis front had traveled to the bottom. If not
20%, something is wrong.
One of their answers to questions at their web site discouraged use of
existing fire pits. I think the answer should depend a lot more on the size of
the existing fire pit. I’d guess that an existing fire pit of 15 “ diameter
would work fine.
Ron
On Jan 14, 2014, at 3:03 PM, Jonathan P Gill <[email protected]> wrote:
> Ron,
>
> Please see a few notes inserted below.
>
> On Jan 14, 2014, at 4:29 PM, Ronal W. Larson <[email protected]>
> wrote:
>
>> Jock et al
>>
>> 1. Answering Michael first - if no char, I wouldn’t call it a TLUD. But I
>> think there will be.
>
> It is fundamentally a TLUD, but one optimized for attractive flames and the
> least amount of end-user maintnance. The current unit, with a 13 inch
> diameter to the combustion chamber, holds a few pounds of pellets. Every 20
> - 30 minutes more pellets are added from the top. This way they can get as
> much flame viewing time as they want.
>
>>
>> 2. To Jock. 40 lbs for five hours says they aren’t interested in cooking.
>> Which is OK if you want a campfire with char output. This looks somewhat
>> like what Kelpie says she likes - based on the Japanese approach to
>> char-making. Forget about the lost energy.
>
> Their current model burns all of the biomass and all of the charcoal down to
> the least amount of mineral ash to create the least amount of residue for the
> end-user. But this might change. Actually they appear to have a way to use
> it for some sort of cooking.
>
>>
>> If they got 10 pounds of char out, then the 30 pounds (about 13.5
>> kilos) of wood at 15 MJ/kilo gave up about 200 MJoules. or 40 MJ/hour or
>> about 11 kW. The solar concentrator discussed recently on this list by Dr.
>> Seifert is probably less than about 1 kW - and that boils rapidly.
>
> The maker was unaware of the clean stove initiative until I spoke with him
> this afternoon. So it is not reasonable to burden him with clean stove
> requirements at this time. He is aiming at a north American market for fire
> pits. I know I want to get one. It will make an excellent compare and
> contrast with my iCan TLUDs
>
>>
>> 3. I am not being critical. There may be a market here - but not for the
>> majority of this list’s customers. Nice looking flame, but I’d rather see
>> the secondary air holes a little bit lower to get some draft. And then some
>> control on primary air. They could probably get 15 hours without much
>> different a look.
>
> I posted this as a related use of TLUD technology, not because I thought it
> had any direct bearing on the Clean Stove work that motivates most on this
> list. But you never know. Cross pollination is a critical aspect of
> creativity.
>
> Best,
>
> Jock
>
>
>>
>> Ron
>>
>>
>>
>> On Jan 14, 2014, at 1:19 PM, Michael Wittman <[email protected]>
>> wrote:
>>
>>> Do you end up with any char after the burn is over?
>>>
>>> Thanks, Michael Wittman
>>>
>>> On Jan 14, 2014, at 11:47 AM, Jonathan P Gill wrote:
>>>
>>>> Friends,
>>>>
>>>> Talk about your basic TLUD design, this is one for sure. 5 hours on 40 lbs
>>>> of wood pellets?
>>>>
>>>> http://www.northerntool.com/shop/tools/product_200609534_200609534?cm_mmc=Google-pla-_-Outdoors-_-Firepits%20%2B%20Patio%20Heaters-_-15624&ci_src=17588969&ci_sku=15624&gclid=CNO2-Ly9-7sCFa9lOgod1B8AdA
>>>>
>>>> Cheers,
>>>>
>>>> Jock
>>>>
>>>>
>>>> Jock Gill
>>>> P.O. Box 3
>>>> Peacham, VT 05862
>>>>
>>>>
>>>>
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>>>>
>>>
>>
>
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