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Peltier junction

Discussion in 'Electrical Engineering' started by Skenny, Sep 7, 2006.

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  1. Skenny

    Skenny Guest

    How effective are peltier junctions?
    Would it be possible to attach one to an aluminum plate, place it in the
    dog's house and keep him cool in 90 and above weather?
     
  2. Probably not powerful enough. The standard 40mm square one used
    in food coolers/warmers pumps about 50-60W depending on supply
    voltage. It consumes about the same power as it pumps, making
    it much less efficient than a fridge or aircon heat pump.
     
  3. Skenny

    Skenny Guest

    Thats what I was thinking too.
    Does anyone have any ideas about cooling dog (or pet's) house during hot
    summer days?
    I know this sounds like a joke, but Im serious.
    A small AC unit would probably work, but I was thinking it would work too
    good, since it would be cooling a very small space. Also, pet hair would
    tend to stop up the filter and evaporator fins.
     
  4. no_one

    no_one Guest

    how about attaching Peltier cooler directly to Dog's primary heat exchanger
    (i.e. tongue)? Tie wrap or velcro seem like a good fit!

    Just kidding
     
  5. Skenny

    Skenny Guest

    My dog would chew it up. I think he could even destroy titanium steel..
    LOL
     
  6. krw

    krw Guest

    This is a *DUMB* idea.
    Peltiers are horribly inefficient and you have to dump the heat
    somewhere (close). The poor dog shouldn't be left outside if it's
    that hot.
     
  7. Beachcomber

    Beachcomber Guest

    An wall array of multiple Peltier junctions would work, but as stated
    above would not be as electrically efficient as conventional
    evaporator-compressor cooling. You would also need to find a source
    of them at acceptable cost.

    One advantage of Peltiers though is that they do not require the
    starting amps that a hvac motor would need.

    You could conceivably power them from a low voltage solar array (12 to
    48 VDC) on top of the doghouse (It would have to be pretty big!).
    Thus, the more sun on a hot day, the more power available for cooling.

    From my own experiments with Peltier junctions, I've noticed that they
    will produce a condensate (dirty water) dripping from the cooling
    plate, just like a regular air conditioner. Take this into account
    with your design.

    Beachcomber
     
  8. Since dogs cool by evaporation from tongue, it's not clear to
    me that just cooling the air will be as beneficial as it is
    to humans. A dog's idea of comfort might be quiet different,
    e.g. low humidity might be much more important.

    Anyway, what about starting with an old but working fridge?
    Take the door off and build out the front to whatever size
    you need for the kennel. It would need to be very well insulated
    and the entrance would need some type of draft barrier (but not
    air-tight or you'll suffocate the pet). Protect the rear
    condensor, compressor and electrical from rain, and make sure
    you run the thing via a GFI. Thermostat will need changing to
    one with a suitable range, e.g. 21C.
     
  9. Forget the peltier's, how about an evaporation unit. You could make a frame
    and cover it with sacking doubled over and rig a solar powered pump to keep
    it wet. A simple sump with a ball valve for the supply.
     
  10. Skenny

    Skenny Guest

    Arent evaprative coolers less effiecent in high humidity?
    I know we tried at our plant using evaporative coolers, they were big bulky
    fans blowing through a paper type media that was wetted by a pump from a
    sump at the bottom. It had to be attached to a water supply to keep the sump
    filled. They didnt work too good though, and after some research (from us
    maintenenace people), we found that the humidity level in our area of the
    globe made the coolers almost not work at all.
    The machine operators complained about them not working, so now they are
    setting in our way at our maintenance shop. (unplugged and pushed in a
    corner.)
    This also goes back to one poster's comment about a dog not sweating, but
    using his tounge to cool. So maybe humidity wouldnt be a factor? Or maybe
    the condensation inside the dog house would be.
    I think that it is an engineer's passion to make things work, and for the
    sake of discussion (such as this newsgroup), any idea, no matter how stupid
    it may sound, is playground material for an engineer.
     
  11. Yup, sure are but it would improve things for the dog I imagine.
    That and some good insulation with low velocity high volume air transfer.
    Perhaps on consideration make a very well insulated kennel under a shade
    roof with the air treatment plant detached ?
     
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