[Stoves] ***SPAM*** Re: Fwd: [tluds] update on the TLUD

[Harris, Kirk]

Ron,

-The setup was quite primitive.  I had a wand which I pushed through a 
hole in the side of the stove and held in place.  First we left the wand 
outside the stove to get a reading of atmospheric pressure.  A better 
technique would be to attach a probe in place and run a tube out of the 
stove to which the sensor is attached. This would be much more stable.  
We tried to hold the sensor tip perpendicular to the flow of gasses to 
get only the static pressure.  The system needs improvement, but we did 
get some basic results.  Sam attached the probe to the sensor that 
measures the pressure in the tubes above the test hood where all the 
sensors are located, so we could read out the results on the computer. 
The sensor has sensitivity to .001 inches of water column.

-Any predictions?  Knowing the pressure is important in commercial and 
industrial burners, so wouldn't it be important in a TLUD.  For a 
natural draft stove, the initial pressure difference is provided by 
buoyancy.  This extends throughout the entire stove.  Once the gasses 
are moving, it is possible for pressure variations to occur in distinct 
locations within the stove.  Forced air can enhance buoyancy.  I predict 
that once we understand how pressure varies in TLUDs we will be able to 
design better TLUDs.

The pressure of the flame gasses at the outside can be measured, but the 
actual pressure which the wood gas would be without the air adding its 
pressure would be difficult to measure.  Any measuring device placed in 
the gas flow will change the flow and so change the pressure.  We 
thought about shielding a portion of the gas with a shield that allows 
the gas to expand as it would without the shield, and then measuring the 
pressure of that.  We could probably get an approximation.

Kirk H.



On 3/26/2021 8:25 AM, Ronal Larson wrote:
> Kirk and two lists
>
> Yours below is a very important message - on pressure differences in a 
> char-making stove.
>
> Can you give more on the way pressure was measured?   From the top, 
> bottom  or side?   Size of piping?    Any chance to measure radially, 
> etc.   Can or has this been done at different power levels?  Any 
> similar data for temperatures at the 4 measurement spots?
>
>
> I think the pressures at the center of your stove (above atmospheric) 
> are not too important - there is little material there and little 
> motion.  It was good to see lower pressure higher up.
>
> There are probably some readers of this who can relate pressures and 
> power levels and temperatures.  A prediction?
>
> You have one absolute (positive) pressure at the canter.  Any chance 
> at the outside where the greatest flow is occurring?
>
> Ron
>
>
>
>> Begin forwarded message:
>>
>> *From: *"Kirk Harris" <gkharris316 at comcast.net 
>> <mailto:gkharris316 at comcast.net>>
>> *Subject: **[tluds] update on the TLUD*
>> *Date: *March 23, 2021 at 12:11:50 PM MDT
>> *To: *"tluds at Biochar.groups.io <mailto:tluds at Biochar.groups.io>" 
>> <tluds at Biochar.groups.io <mailto:tluds at Biochar.groups.io>>
>> *Reply-To: *tluds at Biochar.groups.io <mailto:tluds at Biochar.groups.io>
>>
>> All,
>>
>> Attached is a write-up on the stove I have been experimenting with 
>> over the last several years.  I tried to put it on the stove 
>> discussion list, but it was flagged as spam and so it must have ended 
>> up in every ones spam folder.
>>
>> Kirk H.
>>
>>
>>
>> -- 
>> This email has been checked for viruses by AVG.
>> https://www.avg.com <https://www.avg.com/>
>>
>>
>> -=-=-=-=-=-=-=-=-=-=-=-
>> Groups.io <http://Groups.io> Links: You receive all messages sent to 
>> this group.
>> View/Reply Online (#103): 
>> https://Biochar.groups.io/g/tluds/message/103 
>> <https://Biochar.groups.io/g/tluds/message/103>
>> Mute This Topic: https://groups.io/mt/81557543/3503653 
>> <https://groups.io/mt/81557543/3503653>
>> Group Owner: tluds+owner at Biochar.groups.io 
>> <mailto:tluds+owner at Biochar.groups.io>
>> Unsubscribe: 
>> https://Biochar.groups.io/g/tluds/leave/9337411/3503653/827832023/xyzzy 
>> <https://Biochar.groups.io/g/tluds/leave/9337411/3503653/827832023/xyzzy> 
>> [rongretlarson at comcast.net <mailto:rongretlarson at comcast.net>]
>> -=-=-=-=-=-=-=-=-=-=-=-
>>
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20210326/d8baa848/attachment.html>