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Thread: Homemade Drink Cooler/Warmer?

  1. #11
    Vendor - Qube colin's Avatar
    Join Date
    Dec 2006
    Quote Originally Posted by Sleepyz0mby View Post
    im thinkin temp control with the Qube thats adjustable from the front end? ...

    auto climate control for your beverage? sounds sweet

    glad to see it looks like your Qubes are getting off to a good start
    Thanks, I'm pretty excited for this part of the project! I'm going to print your shipping label in a few minutes!

    Quote Originally Posted by monkers View Post
    iv done some research on them for other purposes.. i cooler that large you might want to consider attaching a heat sink to the side ur not using. As far as i understand a thermoelectric cooler only transfers a maximum or Xwatts of heat from one side to the other, that means that there is a maximum difference that the temperature is going to be on either side is going to be your Xwatts.

    so for example if your trying to keep a drink cold, and your absorbing 10watts of heat on the cold side then your adding 10 watts of heat (drink naturally absorbing heat from the air) to the hot side this will just build up and eventually the hot side will be so hot that the difference is not going to keep you drink cold... unless.. you transfer the heat energy into the air, via a heatsink (and fan)

    iv got a small 40w one and when turned on it get too hot on the hot side to touch within second (without a heatsink)

    another thing is they are really inefficient so it will draw alot of current.

    theres also some stuff on them developing a very high frequency vibration under stress and if not secured under pressure can slowly destroy themselves

    hope this helps.
    feel free to correct me if im wrong.
    Thanks for the information! I will definitely put a heatsink on the opposite side of the Peltier that I'm using. I will also make sure it is secured really damn well! I don't think I can fit a fan in there, though. That might be a problem!

    Quote Originally Posted by OldSpark View Post
    Peltiers are inefficient.
    They do not like thermal/power shocks (the need delays etc).
    They are usually powered with modulated DC for longetivity (and soft starts etc).
    They usually have a maximum 20C differential. For more, they are sandwiched.
    Heatsinks are used on both sides. (ok, so one is a coldsink)

    For heating, resistors are better.

    Usually the cheapest way to get a controller is to buy a small cooler pack. (The output cold be boosted.)
    It makes sense that resistors are better for heating, but cooling is a high requirement too. If I wanted to just heat, I could use a simple coffee pot heater element or something. The cooling is what is going to be cool about this. I got the idea (sorta) from the Dodge Avenger, there's a cooler box above the glove box and it seems so awesome! For the record, I could never buy a controller! I'm strictly DIY so I'd definitely have to do it myself Plus I have a product that is already capable of controlling it!

  2. #12
    Constant Bitrate BassBinDevil's Avatar
    Join Date
    Nov 2004
    Vancouver Island, B.C.
    If possible, find a way to get the coldest possible air to that heatsink. Peltier coolers generate a limited temperature differential, so the cooler the hot side can be kept, the cooler the cold side will be. (Koolatron says 22 to 25 degrees C is typical of their coolers.) I used a Mobicool can cooler (about 20 watts, 22 degree C rated) at work, and in the winter months it would get a can of pop frosty cold, but in hot weather all it could manage was "cool". I've been thinking of scavenging the Peltier cooler from a Koolatron "pro trucker" cooler (maybe 40 to 55 watts?) and turning that into a can cooler. Preferably one that holds several cans if not a six pack.

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