[Stoves] [MHAtech] Re: Top lit updraft combustors

[Ronal W. Larson]

Tom,  and ccs (and adding Kirk Harris - who has reported some high energy-in-char numbers)

	

	1.  Can you clarify what you mean by ”similar gasifiers?   I certainly agree that 25% energy capture in Norbert’s system would be hard - but I don’t think he is calling his present heating approach a “gasifier”

 	2,  I think/hope Kirk is over 25% char by weight (over 30+% energy) char for his TLUDs.  The numbers I have been citing are only TLUDs - which would be a major shift for Norbert.  Stopping a “burn” to maximize char needs a name.
	
Ron


> On Dec 18, 2017, at 5:15 PM, Tom Miles <tmiles at trmiles.com> wrote:
> 
> Similar Gasifiers get 15%-20% yields. I would question 25% or more. 
> 
> T R Miles Technical Consultants Inc.
> tmiles at trmiles.com <mailto:tmiles at trmiles.com>
> Sent from mobile. 
> 
> On Dec 18, 2017, at 6:50 PM, Norbert Senf <norbert.senf at gmail.com <mailto:norbert.senf at gmail.com>> wrote:
> 
>> On Mon, Dec 18, 2017 at 6:22 PM, Ronal W. Larson <rongretlarson at comcast.net <mailto:rongretlarson at comcast.net>> wrote:
>> 	[RWL:  I sometimes hear of reverse flow in chimneys.  Not  to worry in your systems?
>> 
>> It can be an issue with cold starts, but is not a safety concern because there will be noxious smoke, which is obvious. There are various workarounds/fixes for this
>> In normal operation, the heater is warm, and will keep powering the chimney draft long after the fire is out until all the heat is sucked out of the mass.
>> During the charcoal phase, when the thermal mass has been heated, chimney draft is never an issue.
>> 
>> This is quite the opposite of "airtight" stoves that you fill with wood and then turn down for an overnight burn. During the middle-of-the-night charcoal phase, draft can get low and house depressurization can cause a reversal and CO spillage. 
>> 
>> 	[RWL:  No - medium .  I almost never varied a percentage point from 25% by weight (multiply by about 30/18 to get energy).  But we hear 30% by weight sometimes (low temperature char).
>> 
>> Thanks, interesting to know what a good number for yield would be ...............N
>> 
>> -- 
>> Norbert Senf
>> Masonry Stove Builders
>> 25 Brouse Road, RR 5
>> Shawville Québec J0X 2Y0
>> 819.647.5092
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