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  • JoshH129 commented on babblin5's instructable $5 Mini USB Fridge!3 years ago
    $5 Mini USB Fridge!

    Another thing I thought I might add is, you can help the cooling heatsink by polishing it to an almost mirrored finish, it should transfer the cold way better then. I'm not sure on that, but it makes sense to me. Heres my logic, If you take a mirror finish polished aluminum, brass, or copper heatsink and put it in the freezer you won't find that it has frost on it after 24 hours. But, put the same kind of heatsink that has been scuffed up slightly in the freezer for the same amount of time and 9 times out of 10 where the scuff marks are you will find frost, maybe even a thick layer of frost.Just kind of thinking out loud, but hopefully it helps. BTW Chocolate from a Hershey's candybar works pretty good to polish aluminum that isn't too pitted..

    ok not sure if anyone has thought of this, but if you have a peltier that runs on 5-12 volts you could always use two seperate USB cords and attach them both to a single peltier... This would more than likely allow you to use just one Usb at 5 volts, or use both Usb's at around 10 volts. I would imagine doing it this way would almost double your cooling effect inside, but I can guarantee you that a larger heatsink with a fan would also be needed on the heat side. On the outside to get rid of the heat more efficiently it might also be a good idea to try and incorporate some sort of a heatpipe, kind of like inside a laptop for the CPU cooler... these are just a couple of thoughts that might help if someone wanted to actually figure out how to make a way more efficient version. BTW I loved...

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    ok not sure if anyone has thought of this, but if you have a peltier that runs on 5-12 volts you could always use two seperate USB cords and attach them both to a single peltier... This would more than likely allow you to use just one Usb at 5 volts, or use both Usb's at around 10 volts. I would imagine doing it this way would almost double your cooling effect inside, but I can guarantee you that a larger heatsink with a fan would also be needed on the heat side. On the outside to get rid of the heat more efficiently it might also be a good idea to try and incorporate some sort of a heatpipe, kind of like inside a laptop for the CPU cooler... these are just a couple of thoughts that might help if someone wanted to actually figure out how to make a way more efficient version. BTW I loved the way this information was put together, I don't think I could have done it any better myself. Keep up the creativity!

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