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: [email protected] [mailto:[email protected]] 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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