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electricity from waste heat?

Discussion in 'Home Power and Microgeneration' started by zenboom, Jun 15, 2005.

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  1. zenboom

    zenboom Guest

    I gather there is technology to directly generate current from temp diff
    across 2 materials.
    What would you suggest is the potential for increasing energy efficiency by
    using this, or other, technology, on the ICE , A/C etc. ?
     
  2. Dave Hinz

    Dave Hinz Guest

    Yes. Peltier and/or Zeeback (sp?) effects.
    None at all. You'll just put more thermal load on the device making the
    temperature differential, so it works harder. You'll spend more energy
    than you recover.
     
  3. Don Kelly

    Don Kelly Guest

    It has been done and is done. Look up "Peltier" and "thermocouple"
    ..
    It has its uses- I have a heater/cooler unit which I use in my car. It will
    keep a 6-pack plus a bit cool but requires a long drive to actually cool it
    down. I disconnect it when stopped as I want to be able to restart my car.

    .. You still run into thermodynamic limits and the typical efficiency is
    quite low.
     
  4. Reason

    Reason Guest

  5. If there is you could make refrigeration units that use no electricity
    and output some.
     
  6. John  P  Bengi

    John P Bengi Guest

    So far, I have only seen it used in sensor inputs for measurement technology
    but then that is where PV started originally also until somebody could count
    higher than their fingers and stacked them profusely.
     
  7. I have a Thermoelectric Generator that is Propane in, 24Vdc 7amps out,
    no moving parts, and uses 1 USGal/day. Runs on a Peltier Junction
    Pile. Not really efficent, but extremely quiet.


    Bruce in alaska
     
  8. Don Kelly

    Don Kelly Guest

     
  9. JoeSixPack

    JoeSixPack Guest

    What's the expected lifespan of the pile? Will it produce usable power from
    waste heat? Is it worth the initial investment?
     
  10. What's the expected lifespan of the pile? Will it produce usable power from
    waste heat? Is it worth the initial investment?
    [/QUOTE]

    Lifespan of the pile is basically indefinite. It will if the temperture
    differential between the hot and cold sides is big enough. Initial
    investment is very high. 240Watt/$3KUS or there abouts......


    Bruce in alaska
     
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