[Stoves] ToolBox

[Frank Shields]

Dear Crispin,

 

Not sure where to start but I am going to suggest a very different approach
to determine efficiencies. 

1) We need to eliminate variables in the Fuel  if we are ever to get
control. 

2) Variables pertaining to HHV to LHV are uncontrollable as we do not know
if heat between the two (condensation) may be used in the task (if I am
understanding this correctly). 

3) Moisture (and other constituents) in the fuel used when testing a stove
is controlled with a classification system of the fuels. Using such-n-such
fuel we get..

4) Guessing if something is torrefied wood or char is too great a variable
to be guessing.

5) All the testing required should be on-site and easy when following the
fuel energy.

 

So my suggestion is to forget all the water (moisture, HHV, LHV condensation
etc). Forget ash and everything except Carbon.  

So we follow the Carbon. (nice to have hydrogen but that starts much less
than carbon energy in biomass and goes to nothing as it chars).

 

Efficiency is:  Carbon used / Task completed. 

 

We need an on-site test to determine carbon in starting fuel and fuel
remaining in stove. Never done this but thinking one could squelch  left
over fuel after the first task, grind it and place a known weigh in a
container where oxygen is drawn through to get complete combustion. The
gasses drawn through 1N NaOH to collect for the CO2 calculation (titration)
or CO2 meter. 

 

Using more elaborate testing in a lab the Carbon used could be converted to
dry fuel, received fuel, truck loads anything else. 

 

Frank

 

 

Thanks 

 

Frank Shields

 

BioChar Division

Control Laboratories, Inc. 

42 Hangar Way

Watsonville, CE  95076

 

(831) 724-5422 tel

(81) 724-3188 fax

 <mailto:frank at biocharlabs.com> frank at biocharlabs.com

www.controllabs.com

 

 

 

 

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Crispin Pemberton-Pigott
Sent: Monday, April 22, 2013 7:48 AM
To: 'Discussion of biomass cooking stoves'
Subject: Re: [Stoves] FW: REQUEST for complete sets of raw data of cookstove
tests.

 

Dear Jim and Anyone watching

 

I won't have time to dig through the messages on this thread that were in
limbo. If something is really important to someone, ask again.

 

With regard to the char remaining and the wood that has been burned on one
end (fuel left over from tests) Harold Annegarn and I have a proposal for
how to deal with stoves that can use fuel remaining from a previous burn. In
principle, the test should be started with the fuel left over from a
previous test. In other words a cooking task that is replicated a number of
times in which the fuel left over goes into the stove for the subsequent
task provides an opportunity to measure (quite accurately) the raw fuel
drawn from the pile.

 

Any charcoal that is not being discarded and all partially burned, dried,
blackened stoves that are claimed to be useable fuel, not discarded, should
be used. If new fuel is needed (which it will be) then that new fuel is raw
fuel.  It becomes quite a simple matter to measure how much new fuel is
required for each identical replication of a task.

 

The issue is discussed in the attached document in '1. Replications'.

 

A number of definitions are provided in the subsequent sections that are
useful for discussing tests and efficiencies.

 

Importantly, if a stove cannot use any of the fuel remaining (an example
might be a TLUD wood burner that makes a high % of char) the energy in the
remaining fuel cannot legitimately be counted as cooking fuel - because it
can't be used in that stove for cooking.

 

It then becomes and easy matter to determine the raw fuel consumption per
cycle for that task.

 

Regards

Crispin

 

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