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
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