[Stoves] K Smith Article in Energy for Sustainable Development

[Crispin Pemberton-Pigott]

Dear Paal

 

Many thanks for those details. It is not perhaps know that I forward a lot
of information to people who write to me privately so I maintain a huge
library of technical information and usually it gets use.

 

It is very important that in order to bring the stove community into the
work of thermal power engineering that we learn to talk the talk and the
emissions per unit of energy are what we have to learn to sue.

 

Thanks for your energy used figure for the test. I will be able to use the
CO2 emitted and the total energy to calculate what the fuel probably is, and
what the emissions are per MJ. Emissions per kg are not as helpful because
you cannot compare stoves using different fuels unless it is first reduced
to energy (MK or kJ are common). 

 

With this in mind, what does:

 

>PM to Cook 5L (1500      223.1

>15,000/25,000mkJ             

 

Mean? I am not sure if the mkj figure goes with the 223.1.

 

223.1 milligrams?

 

We need the emissions stated as nnn mg/MJ. That people understand. What you
do when cooking is up to you but the emissions need to be expressed in
'normal' terms. The word normal of course means different things in
different industries. Coal burning people have a really strange set of
expressions that do not match other fuels. As we have to accommodate all
sorts of fuels, even in the same stove. In order to make meaningful
comparisons, we need the common denominators across the board.

 

For example the performance of a traditional Mongolian wood stove, burning
coal, gives about 300 mg/MJ of PM 1.0. (it doesn't make any PM10 and nearly
n PM2.5 either).

 

By very slightly changing the way the stove allows the gases to exit the
combustion chamber ($1.00) and changing the way the stove is lit to
approximate a TLUD, the emissions are reduced by 80% or more! Amazing. 

 

When we compare the same stove burning wood and coal, we are not using the
metrics common in the emergent stove community nor the coal industry, but
the ones used in industry and science labs where energy is measured and
discussed. It is SO much easier now to make comparisons between ethanol,
wood, coal, paraffin, dung, peat and pellet burning stoves - or any fuel
combination. Interesting, neh?

 

Keep up the good work Paal. I have been following your work for 22 years
since I first heard about it.  It is very important that you try to
publicise the dimensions. People should not have to re-invent the "Paal"!

 

Best regards

Crispin in warm Ulaanbaatar (it was +2 today!)

 

From: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Paal wendelbo
Sent: 04 December 2010 19:17
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] K Smith Article in Energy for Sustainable Development

 

Grispin

To your infomation if Dean dont' have the exact figures by hand the TLUD-ND
I made at Stove Camp 2009 had the following settings.  

        The combustion chamber  had a diameter 150mm and was 180 h

*	55 mm free space from concentration lid up to the pot
*	105 mm hole in concentration lid
*	6 mm split between concentration lid and top of thee combustion
chamber - 4x15mm for the stand for 2nd air
*	5 five mm holes 75 mm up from the bottom on the side of the
combustion chamber 
*	5 five mm holes 25 mm up from the bottom on the side of the
combustion chamber 
*	13 five mm holes at the bottom plate for 1st air
*	15 mm space between combustion chamber an cover for preheating of
2nd.air

The combustion chamber was filled with 1kg of wood pellets and a complete 5
wbt carried out.with following result.

 

Fuel to Cook 5L 

(8 50/1500) g                   768.8

CO to Cook 5L (20)           23.0

PM to Cook 5L (1500      223.1

15,000/25,000mkJ             

Energy to Cook 5L         14,807

Time to boil 5 litres min      28.1

CO2 to Cook 5L               708.6

 

Regards Paal W 

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