Dear Frank "The starting fuel and, especially, the ending fuel has a lot of room for error. If we ran a cord of wood through Paul's TLUD without stopping the error percent at the ends would be much smaller than when we just run a few Kg of fuel. That's my point."
Hmmm....well my point is that if you do that with a cord of wood, you will not get anything lie a representative emissions profile. The greater part of PM and CO do not come from the long term burn. This is an important consideration. Have a look at the two charts I sent yesterday. The vast majority is emitted when starting. After a while there are nearly no particles emitted if the fuel is a batch process. If it is continuous, like pushed sticks, or continuously added pellets, that is a different story. So how you set up the test can give very different results from the same stove. Running stove for a very long time that will, in use, not be run for a long time, means very incorrect evaluations. You get my drift? There is a strong belief in European testing circles that the emissions from fuel are inherent in the material being burned - that when it is burned they are 'released'. This is obviously incorrect. The black smoke belching from a poorly adjusted diesel engine has nothing to do with the diesel. So testing should represent actual use especially in terms of the starting cycle and the operating parameters such as cooking a pot of beans or frying in a wok. For space heating that means (in most cases) an ignition cycle, a refuelling cycle and a dying fire phase. It is easy to add sections together afterwards in any combination such as 1 ignition, 3 refuelling and 1 drying fire. That is typical of some cities in winter months. During spring the cycle might be 1 ignition and 1 dying fire. Running the stove for 16 or 20 hours only tells us something when a change is made (like adding fuel). It is all about profiles and capturing the emissions and performance during each repeatable segment. Regards Crispin _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address Stoves mailing list to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/ [email protected] http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
