[Stoves] Equipment required for testing stoves

Tue Dec 4 15:14:52 CST 2012

Paul,

I like the vase. And having a pot of water on top collecting 'energy' as the
WACW cools seems like a great method of measuring energy loss during the
cooling that can be added on to the values determined from a ground and
tested WACW. Wonder if that would work - Crispin? 

Frank

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Paul Olivier
Sent: Tuesday, December 04, 2012 12:41 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Equipment required for testing stoves

Frank,

Getting an accurate dry weight of biochar is indispensable in being able to
sell it.
If we douse the biochar with water, then we no longer have an accurate
measurement of dry weight.
Also biochar right out of the gasifier contains valuable heat that could be
used in keeping food warm.

Therefore I designed a terracotta vase to contain the hot biochar.
A pot placed on top of the vase prevents oxygen from entering.
The vase shown in the drawing below can hold six liters of biochar.
This is the volume of rice hull biochar produced in my 150 gasifier.
https://dl.dropbox.com/u/22013094/150%20Gasifier/Terrecotta%20Vase/Drawing/T
erracotta%20Vase.pdf

Thanks.
Paul Olivier

On Wed, Dec 5, 2012 at 3:20 AM, Frank Shields <frank at compostlab.com> wrote:

Hi Crispin,

Weighing the fuel when removed (hot and burning) and dry weight after
soaking with water, draining (screen) and drying is not a convenient
procedure to determine moisture left -and prone to error - but only method I
can think of at the moment.
Water puts out a fire by taking away its heat. So wondering if there is
another method that could be used? Combination nitrogen gas and pieces of
steel in a tumbler? Must be some way besides water.

Frank

Frank Shields
Control Laboratories, Inc.
42 Hangar Way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
www.biocharlab.com

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Crispin Pemberton-Pigott
Sent: Tuesday, December 04, 2012 11:26 AM
To: Stoves
Subject: Re: [Stoves] Equipment required for testing stoves

Dear Frank

You are on the right track, in my view. The assumed energy for the wood and
char is a major source of imprecision in the test.

As for quenching with water: unfortunately we need to know the residual
moisture content of the fuel 'as removed'. That varies a lot depending on
the stove type. Quenching it with nitrogen is an alternative.

Regards
Crispin
-----Original Message-----
From: "Frank Shields" <frank at compostlab.com>
Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org>
Date: Tue, 4 Dec 2012 10:19:39
To: 'Discussion of biomass cooking stoves'<stoves at lists.bioenergylists.org>
Reply-To: Discussion of biomass cooking stoves
        <stoves at lists.bioenergylists.org>
Subject: [Stoves] Equipment required for testing stoves

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