[Gasification] Gasification or Pyrolysis + Absorption Chiller for Fruit

[Art Krenzel]

David,
The number of absorption refrigerators (ACR) number in the tens of thousands in just the RV market alone today as just one example.  Virtually every RV you see on the road in the US has some form of a small ammonia based cooler/refrigerator in it.  Sales are both in the new and the retrofit markets.  ACR refrigerators have a more finite life and are subject to early failure from abuse and operations while not properly level.
Art Krenzel


Date: Fri, 15 Aug 2014 09:50:23 -0700
From: david at h4c.org
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Gasification or Pyrolysis + Absorption Chiller for Fruit


  
    
  
  
    

    

    Friends,

      

    
    On 8/14/2014 2:54 PM, Big Daddy wrote:

    
    
      
      
      
      
      
        Gentlemen,
         
        I live in the
            tropics (Puerto Vallarta), and have a very keen desire to
            power a refrigeration system from gas… I always assumed it
            would be some sort of ammonia refrigeration system, or a
            super-big version of an RV fridge. Currently, I build
            charcoal retorts and charcoal gasifiers… Just haven’t had
            time to dive into the refrigeration sciences yet.
         
        Additionally,
            there may be a way to use “waste heat” from a retort vs.
            direct flame… I just don’t have the numbers yet, but am very
            interested in this thread.
      
    
    

    I am ignorant in a vast array of subjects, including the fine points
    of the physics of refrigeration. That gives a context for my saying
    that I have heard that absorption cycle refrigerators (ACR)-- that
    is, those which are passive, using only convection to pump fluids--
    are far less efficient than technologies which rely on active
    pumping and/or compressors. ACRs are often quoted as having single
    digit efficiencies, and further that in general it is more efficient
    to generate electricity and use that to power a refrigerator;
    although of course YMMV. If this is the case, then whether the
    working fluid is ammonia/water or some other, and again speaking
    generally, one would probably use ACR where there is no electricity,
    or where there is an abundance of heat which would likely otherwise
    be wasted, etc.

    

    Or use a better ACR. Interestingly, Albert Einstein shares a number
    of patents directly and indirectly related to ACR technology with
    Leó Szilárd (another physicist, noted as a science fiction writer),
    and some say that their technologies offer better efficiencies. 

    

    But the final fly in the soup is that few ACR refrigerators are
    still manufactured, and as such while a discussion of the technology
    may be of interest, few of us have the machine shop, the knowledge
    and the skill to translate any of that into reality.

    

    

    

    d.

  


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