[Stoves] Calc. void space and pellet particle density

Boll, Martin Dr. boll.bn at t-online.de
Mon Mar 10 14:55:29 CDT 2014


Frank,

An important idea aside this topic is, that  the void-space, especially within thick fuel-layers, makes a lot of resistance for the air-flow in TLUDs, sometimes too small, sometimes too high.

Therefore I think 
- that primary-air should be added strictly separated from secondary-air. 
- The primary-air should be given with a relatively high air-pressure, and then exactly down-rated e.g. by a rotameter, or in low-tech by squeezing the elastic inlet-tube with a screw-clamp.

By that, the relatively small difference of pressure-loss caused by the down-burning stack, would nearly make no change of the primary-air amount per time.

-Possibly, by that,  the good-burnable particle size (pellets, wood-slices, rough-saw-dust) could be of wider range; and further:
My guess/hope behind that is, to be able to burn "Hackschnitzel" ( of different size within one batch!) in an appropriate manner.
- ( = the stuff from shredding wood and branches ) I think that is as well what Dean Still intends to reach.

How to get this "high"-pressure will be another interesting topic.

Regards
Martin

P.S. Other side questions questions about void-space to think about:
What air-speed is necessary to make charcoal-glow within the TLUD-stack sufficient to gas-out continuously?
What air-speed is necessary to make charcoal-flow so hot, to reach and continue self-incending temperature of wood?





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