[Stoves] Update on new approach: Simple natural draft TLUD
Paul Anderson
psanders at ilstu.edu
Sun Sep 10 17:21:12 CDT 2017
Jock,
Seeking to understand your configuration.
1. First photo says Primary air holes @ 7/16ths. Which would be almost
8 / 16th or almost 1/2 inch. Does not look like the holes are that big.
2. You do not have a concentrator hole. Instead you have 2 concentric
rows of holes (photo 2). But does the secondary air enter UNDER the
piece through a gap, or does the secondary air only meet the gases as
the gases come out of the holes?
Looking forward to the video.
Paul
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: psanders at ilstu.edu
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 9/10/2017 4:36 PM, Jock Gill wrote:
>
>
>
> Primary air holes @ 7/16ths
>
>
>
> Vent holes. Outer ring has 33 holes of 1/4 inch. Inner rowing has 20
> holes of 5/16ths.
>
> The secondary air is pulled into the fire via the Venturi effect. Hot
> gases rising pull in the cooler, but per-heated, secondary air that
> rise between the cap can and the reactor can. Note: It appears that
> the diameter of the cap with vent holes divided by the diameter of the
> reactor can should be at least 1.6
>
>
>
> The rector can can is about 6 inches in diameter. It started life as
> a three pound Costco coffee can.
>
> The cap sits on three angle brackets that create a gap of about 3 MM
> between the top of the reactor and the cap. The secondary air enters
> through this 360 degree gap. The cap extends about 2 CM down the
> sides of the reactor can.
>
> The photo show the system as configured for my last test. Achieved
> 1,000 F in the draft can on top. Made some pretty good charcoal too.
> 450 grams of softwood pellets went for about 37:30.
>
> The performance/results can be varied by the height of, or absence of,
> the draft can. Also vent holes can be filled with bolts to reduce the
> draft. Runs times can be extended to 50 minutes, but there will be
> quite a few pellets that are not charred or are only partially
> charred. Longer run times have, not surprisingly, lower temperature
> yields.
>
> A 20 second video to follow. As you will see, this is not a
> completely smoke free set up at this stage of development. Some
> tuning appears to be required. Perhaps 1000 grams of fuel, as 450
> grams leaves most of the reactor can empty. More fuel will modify the
> draft forces. Could be good or could be bad.
>
> Thoughts? Suggestions?
>
> Cheers,
>
> Jock
>
> Jock Gill
> P. O. Box 3
> Peacham, VT 05862
>
> Cell: (617) 449-8111
>
> Extract CO2 from the atmosphere!
>
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