[Stoves] Lowering emissions

[Crispin Pemberton-Pigott]

Dear Frank

Hey, that is a good idea too.

How about this: get the void volume with sand and then place all the pieces 
of wood end to end and get a total length.

There must be a relationship between the total length of all the pieces and 
the volume.  I would not be surprised if the relationship was quite 
predictable within a few %.

Peter Coughlin, can you comment on the statistical implications of this 
approach?

Regards
Crispin

----- Original Message ----- 
From: "frank" <frank at compostlab.com>
To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
Sent: Wednesday, January 03, 2007 1:08 PM
Subject: Re: [Stoves] Lowering emissions


Crispin and others,

One way I tried was to wet wood with water and coat with #30 sand.
Worked somewhat. I calibrated with weight of sand per unit area. Powders
did not work.
So I do not have a good method. I think it would be a useful measurement
if someone can think of a good way to test it.  But think we can work
around that with 1) particle size - void space ratio for ball or block
shaped particles, 2) diameter of long particles (sticks) - void space
ratio etc. The choice of the two methods to pick from could be based on
an agreeable length to width ratio value. As you say it gets complicated!

Frank






Crispin Pemberton-Pigott wrote:

>Dear Frank
>
>I have another question you might have some thoughts on.
>
>How can I measure the surface area of a selection of firewood, compared 
>with
>its volume?
>
>Your sand method will find the volume.  An important number is the ratio of
>area to volume: M^2/M^3.
>
>Ideas anyone?
>Crispin