[Stoves] cook stoves for Cameroon

Otto Formo terra-matricula at hotmail.com
Tue Sep 16 02:39:02 CDT 2014




Dear Paul and Huck,
 
I find this issue a bit od and out of "topic".
Why is suddenly WOOD such a "hot topic", when the most interesting part is FUEL, Solid or Liquid from any type of biomass?
 
Producing charcoal or any other liquid fuel, you can not SKIP the processing part, consuming energy as well.
This is also called a "Life circle" for a product (biomass fuel) - see energy forestry.
 
Gasifier units; read
"Micro Kilns", utilizing the charcoal from wood or any other dry biomass for cooking, will be more energy and fuel efficient, compared to traditional made charcoal.
  
Because you are utillizing the energy content in the biomass for cooking, while producing charcoal,  wheter you test the other way or another. 
Have a Nice day. 
 
Otto
 
Date: Mon, 15 Sep 2014 23:25:02 -0500
From: psanders at ilstu.edu
To: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] cook stoves for Cameroon


  
    
  
  
    Huck,

      

      Crispin wrote:

      Thus ‘gasifiers’ are getting rated as if they do
          not consume fuel that is actually consumed.
      Crispin's point is that wood that is turned into charcoal is no
      longer wood.   THAT is true.    But there are two ways to state
      the efficiency:    Fuel efficiency and Energy efficiency.   
      Charcoal that is created is no longer wood.   But it is a fuel
      made from wood that was transformed.    And it typically represent
      25% to 35% of the energy that is in the dry weight of the wood.  

      

      You indicated that the area is reasonably wooded.   So it is not a
      case of scarcity of wood.   

      

      If the created charcoal is put into the soil as biochar, then that
      energy content is no longer available.

      

      You as the project leader and with your personnel can make the
      decision about how to read the numbers in the reports on stove
      efficiency (of fuel or of energy).

      

      Paul

      

      Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD  
Email:  psanders at ilstu.edu   
Skype: paultlud      Phone: +1-309-452-7072
Website:  www.drtlud.com
      On 9/15/2014 10:45 PM, Crispin Pemberton-Pigott wrote:

    
    
      
      
      
      
        Dear
            Huck
         
        Just
            one quick point:
         
        “The gasifier, as I understand it, is more
            efficient and has lower emissions.”
         
        
          
            
              It depends on the test method and the
                  metrics. It is fashionable to use the GACC-WBT and
                  that test does not report fuel consumption, it reports
                  the fuel mass equivalent of the energy consumption,
                  treating charcoal left over as unburned raw fuel
                  (meaning it says the wood was not consumed).
            
          
           
          Thus ‘gasifiers’ are getting rated as if they
              do not consume fuel that is actually consumed. When you
              assess the performance be sure you are clear on how the
              method calculates performance and what the metrics are.
              You may want to measure ( and weigh) fuel needed per
              cooking cycle rather than use any calculated numbers from
              a complex test protocol.
           
          For evaluation of performance I recommend the
              CSI-WHT which is a water heating test (no boiling) and a
              measure of the raw fuel needed per replication of the
              cooing cycle. It is used by the WB in the Clean Stove
              Initiative in Indonesia. Documentation (some anyway) is
              available.
           
          Regards
          Crispin in Tamil Naidu
           
        
      
      

      
      

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