[Stoves] air for gazification

[frank at compostlab.com]

Thanks again A. D. Karve,

When I test water going through soil to make sure there is enough drainage we
use hydraulic conductivity in units of cm/sec. Is there an 'air conductivity'
term for air going through a packed material? and isn't cm/sec more
appropriate for a measure for determining the optimum flow through the raw
fuel to the primary burn? That would save a lot of calculating ie. no concern
of the cm2 area of the cross section of the raw fuel and the volume one gram
of air would take up at STP.  

The oxygen/nitrogen ratio of air is the same at sea level as it is high in the
mountains - just less of it. So if a stove is designed to produce a working
flow of, say, 0.4 cm/sec at sea level. To use the stove at high elevations the
fuel would need be packed in with fuel having more void space to get an
increased flow of, say, 0.6 cm/sec to do the same thing. At least that is how
I am thinking about it today. But I want to use units most others are using. 

Thanks
Frank

  


On Tue, 19 Jun 2007 09:07:28 +0530, adkarve wrote
> In the case of water, the flow rate through a pump is refered to as litres
> per second. It refers to the amount of water delivered at the pump outlet.
> Also in the case of biogas, we refer to litres per hour, when we 
> refer to biogas flowing through a biogas burner. The distance 
> travelled by the water or by the gas are not mentioned. Yours
> A.D.Karve
> ----- Original Message -----
> From: frank <frank at compostlab.com>
> To: Discussion of biomass cooking stoves <stoves at listserv.repp.org>
> Sent: Tuesday, June 19, 2007 12:56 AM
> Subject: Re: [Stoves] air for gazification
> 
> > Stovers,
> > Now I am wondering is g/sec is even a flow rate? Don't we need a
> > distance and time? I'm a little slow at this : ) If so I think this
> > should read cm/sec in the report.
> >
> > But I do like the idea of reporting grams O2/cm/sec or grams air/cm/sec.
> > That way we can calculate the carbon from the fuel converting to CO2 and
> > the heat produced (?) on the raw fuel surface.
> >
> > Thanks
> > Frank
> > .
> >
> >
> >
> > >And this is directly relevant to Frank's question
> > >
> > >
> > >
> > >>But once again I run into problems with the units. The flow rate for the
> > >>primary air is reported as [ Primary air flow(g/sec) ]???? Typical
> numbers
> > >>are
> > >>0.4 to 0.9 g/sec.
> > >>
> > >>
> > >
> > >
> > >
> > >>Is there any way to convert g/sec to cm/sec? And what are the grams they
> > >>are
> > >>referring to? Is it the rate fuel is being oxidized? Or carbon (and
> carbon
> > >>products) going to the secondary??
> > >>
> > >>
> > >
> > >Thanks
> > >Crispin
> > >
> > >
> > >_______________________________________________
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> > >http://info.bioenergylists.org
> > >
> > >
> > >
> > >
> > >
> >
> > --
> > Frank Shields
> > Soil Control Lab
> > 42 Hangar way
> > Watsonville, CA  95076
> > (831) 724-5422 tel
> > (831) 724-3188 fax
> > frank at compostlab.com
> > www.compostlab.com
> >
> >
> >
> >
> > _______________________________________________
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--
Frank Shields
Soil Control Lab
42 Hangar Way
Watsonville, CA  95076
(831) 724-5422tel
(831) 724-3188fax
www.compostlab.com
www.greenrooflab.com