[Stoves] New Kirk Harris stove

[nganga liambai]

Good day Ron,
Your analysis of Kirk' 3 hour TLUD below is impressive and motivating. However, I have found it rather too advanced in some essential aspects, Is there some specific literature you can prescribe in this regard to help.
Nganga.

 
 
  On Fri, Jun 12, 2020 at 1:53, Ronal Larson<rongretlarson at comcast.net> wrote:   List:   
 1.  I list myself as a cc, because I’ve stopped receivinging recent stove list material - for unknown reason (even though Andrew assures me I’m still a list member).  Please list me as a cc if you respond to this.
 2. This is about the new stove that Kirk talked about a few days ago - and Tom Miles gave this backup from the stove archive site:  http://stoves.bioenergylists.org/files/harris_3_hour_tlud_06_04_20.pdf<https://click.api.drift.com/click/baa65bd9-95ed-4749-af2e-86ac72890cf2?u=http%3A%2F%2Fstoves.bioenergylists.org%2Ffiles%2Fharris_3_hour_tlud_06_04_20.pdf%3Fd_utk%3D2c66a24b-c042-4db9-905e-b77c486b8996&h=96c42694cdbd72a4e1f2c4732c6fdebd>	You’ll need to look that over to see what I talk about below.	 3.   To help with my present interest (with Kevin McLean) in stoves using corn cobs, I’ve now talked for several hours with Kirk about his new design.  My main purpose in this note is to have others look closely at what Kirk has told us.  I know if no other TLUD that comes anywhere close to handling 3 hours of use - and with super emphasis on combined char-making, efficiency and clean burns.   Will be tested as soon as virus conditions improve.
 4.  The first new idea I see here is that the center of pyrolysis gas combustion moves upward as the power level increases. Anyone seen that principle before? Kirk has a very wide range of possible power levels - probably a turn down ratio (TDR) greater than 10 - bigger range than my home electric range.   Of course not natural draft, but a natural draft version using his principles seems likely to get better than TLUD's usual TDR < 2. The lowest power level is accommodated with a set of relatively small holes just above the maximum fuel level.  There is some preheating of that secondary air. Average power levels (an incredible 5-6 kW) are predominantly handled a few inches further up for the pyrolysis gas volume that is too large to be handled by the “low power" holes.  This by the excess gasses seeing some restriction - by striking a central "blunt body”.  As these “average” gases flow outward, they create (via Venturi principles) a lower pressure regime that further encourages mixing.  For me, two new ideas. As power level is further increased( by adjusting blower speed and/or location), these larger gases that could not be combusted by the first two means meet the outer most secondary air gases that are being forced inward at another diameter restriction location.  Also, for me,  a new idea.
 5.    Another new idea: Above these three meetings of the two gas streams there are further radii changes supported by a central column - that I haven’t seen before.   Again, used to get more clean combustion and improved efficiency.  (And all planchas need effciency help.)
 6.  The way he is handling the fan/blower seems new.   All focused on primary air control.  His secondary air is all natural draft.
 7.     Kirk has come up with this at his own expense.  To help a group interested in adding charcoal- making to plancha type cooking.  There are several theses in here for someone able to instrument this for the numerous interesting pressure and turbulence variations that Kirk has included.
Kirk - thanks for all this new work (and please correct what I have gotten wrong here).   (I think Kirk already holds the world record for cleanliness - I hear that testers are sure it can’t be as clean as he has already proven he can get.)
Ron

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