Dear Paul, Very usefull information, thanks. Do you happend to know what type of pyrolytic gasifiers they were using in Western Kenya? Do you have any contact point or information about ICRAF in Nairobi? Otto
Date: Wed, 24 Apr 2013 13:27:46 -0500 From: [email protected] To: [email protected] CC: [email protected] Subject: [Stoves] Energy / fuel / biochar DATA from Kenya Re: FW: REQUEST for complete sets of raw data of cookstove tests. Dear Stovers who want truth in reporting about stove efficiency. The title and abstract below seem to be a good example to illustrate what happens when stoves can use fuels other than wood and can produce charcoal (for burning or for biochar). This is not my data, and not my stove design. How do we get this type of "stove IMPACT" included into stove testing? I think the word IMPACT can carry the same weight as efficiency. "ENERGY efficiency" should be reported. "Fuel impact" might be an additional result to report. Paul "Biomass availability, energy consumption and biochar production in rural households of Western Kenya" Biomass and Bioenergy Vol 35 (2011) pp.3537-3546 Dorisel Torres-Rojas a, Johannes Lehmann a,*, Peter Hobbs a, Stephen Joseph b, Henry Neufeldt c a Department of Crop and Soil Sciences, Cornell University, 9090 Bradfield Hall, Ithaca, NY 14853, USA b University of South Wales, NSW 2052, Australia c World Agroforestry Center (ICRAF), Nairobi, Kenya Abstract Pyrolytic cook stoves in smallholder farms may require different biomass supply than traditional bioenergy approaches. Therefore, we carried out an on-farm assessment of the energy consumption for food preparation, the biomass availability relevant to conventional and pyrolytic cook stoves, and the potential biochar generation in rural households of western Kenya. Biomass availability for pyrolysis varied widely from 0.7 to 12.4 Mg ha1 y1 with an average of 4.3 Mg ha1 y1, across all 50 studied farms. Farms with high soil fertility that were recently converted to agriculture from forest had the highest variability (CV ¼ 83%), which was a result of the wide range of farm sizes and feedstock types in the farms. Biomass variability was two times lower for farms with low than high soil fertility (CV ¼ 37%). The reduction in variability is a direct consequence of the soil quality, coupled with farm size and feedstock type. The total wood energy available in the farms (5.3 GJ capita1 y1) was not sufficient to meet the current cooking energy needs using conventional combustion stoves, but may be sufficient for improved combustion stoves depending on their energy efficiency. However, the biomass that is usable in pyrolytic cook stoves including crop residues, shrub and tree litter can provide 17.2 GJ capita1 y1 of energy for cooking, which is well above the current average cooking energy consumption of 10.5 GJ capita1 y1. The introduction of a first-generation pyrolytic cook stove reduced wood energy consumption by 27% while producing an average of 0.46 Mg ha-1 y-1 of biochar. Paul S. Anderson, PhD aka "Dr TLUD" Email: [email protected] Skype: paultlud Phone: +1-309-452-7072 Website: www.drtlud.com _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] 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://stoves.bioenergylists.org/
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