[Stoves] Energy / fuel / biochar DATA from Kenya Re: FW: REQUEST for complete sets of raw data of cookstove tests.

[Otto Formo]

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: psanders at ilstu.edu
To: stoves at lists.bioenergylists.org
CC: biochar at yahoogroups.com
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:  psanders at ilstu.edu   Skype: paultlud  Phone: +1-309-452-7072
Website:  www.drtlud.com
      

    
  


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