[Stoves] Air power Re: Burning saw dust in TLUD stove

[Richard Stanley]

Good thinking Crispin. 
I still debate the need for constant thickness flywheel though. You could use that same cnc flame to cut a fat ring and tack it onto periphery of a thinner disk . Agree on the water leak and baffle cost  issue but as I think about it, one could use sand or some of that ready aggregate such as is being ground on sitem probably with very few baffles needed...I challange that becasue it seems the 170 Kgs worth of flywheels  could be made up locally greatly cuttiing costs of shipping the raw machine .high shipping costs mean that nobody wins except for the transport  agent 
 The sheer flywheel weight must works against shipping cost, unless you have an aid emergency releif operation at play.  
Clever stuff in all though. Congrads on your design work.  
Richard 

On Jan 18, 2011, at 7:03 PM, Crispin Pemberton-Pigott wrote:

> Dear Richard and Kevin and Robert
>  
> I found the description confusing. I also thought that he was describing a top lit updraft stove with some air provided from below.
>  
> There is a company in Turkey called SILVER that makes TLUD stoves and has been doing so since 1958. I am in fact reprocessing a test done in December on one of them, not the smallest version. It peaks three times at 24 kW during the burn. It behaves badly and needs better secondary air which I found easy to add. They it was really good.  I think they had never had a test done before, certainly not one with gases and PM.  Lots of potential with small modifications.
>  
> So TLUD is not all that new I guess. It keeps getting rediscovered because it is a good system at least for some applications. In UB not being able to refuel it until it is nearly out is a major disadvantage.
>  
> Richard re the crusher:
> >…but why such an investment in thickness across the full diameter of the flywheel.
>  
> Cost, strength and no machining. It is CNC flame cut. The mounting flange and handle holes are drilled later but that’s all.
>  
> >Wouldnt it be far better to thin out the inside and fatten up the outside.
>  
> Then it would have to be cast. No way.
>  
> The MV squared rule  has me thinking that you want the maximum percentage of available mass at the largest radius where it is moving the fastest...There is a far more elegant way to say that eh ?  
>  
> Elegance means efficacious simplicity, not necessarily least quantity of material.
>  
> >Did anyone think about making up a water tight ring chamber  with lots of baffles for filling with water as the mass ?
>  
> Yes. Too expensive and will definitely leak after it is dropped a few times. Unrepairable in the field.
>  
> >…easier on the hands when you hit  really solid bits of rock concrete or steel rbar...etc.  
>  
> The hands feel nothing. The 2 x 85 kg flywheels crush anything in their path. It will crush tombstone granite to 5mm chips. I have seen it crush road spalls with a Treton Impact value of 8 which is too hard for a commercial crushing operation. The rocks explode 3 metres into the air when they finally yield!
>  
> > Now don'tchya just love this kind of armchair defacto critique ?
>  
> That is where many good ideas come from. Most fields of engineering (including stoves) are filled with ‘thou shalts’ and ‘shalt nots’. Many an off the wall comment inspires a new direction, unrestrained by the ‘obscuring dust of acquired knowledge’.
>  
> The machine was developed by Nigel and Yours Truly P-P in 1995 after two years of theoretical work and chasing up one failed avenue. The plan was to increase income and limit eye and hand injuries while still operating manually. There are a few hundred of them around.
>  
> Institutional stove projects (there is one coming up in Namibia) need aggregate for bases and slabs and this is one way to cut transport costs a lot. I like the fact the money goes to labour rather than imported equipment, maintenance and fuel.
>  
> Regards
> Crispin
>  
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