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  • Question About Cold Retaining Metal

    From Johnathan Standridge@21:1/5 to All on Fri May 19 00:18:02 2017
    replying to Ed Ruf, Johnathan Standridge wrote:
    Everyone is debating how long any metal will stay cold, but I wonder, will copper leach out into the drink, and if so, is that really safe? Just to be on the safe side, I'd say iron or someone said porcelain. Personally, I'd love to see someone make some neat porcelain drink coolers.

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  • From lucid@21:1/5 to lucid on Sun Aug 6 03:18:02 2017
    replying to AlWahrabi, lucid wrote:
    eriment--it's the phase change from solid to liquid that makes ice a good
    source of cooling. MBush>>
    Yes, I understand that frozen water (ice) would be
    may want to look into peltier chips?

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  • From timewethink@21:1/5 to All on Tue Aug 9 14:45:03 2022
    Not sure if you will see this reply considering the age of the thread, but I have a follow-up question to you reply: I recently bought two types of Arctic Ice brand freezer blocks, one freezes at 28.4ºF one freezes at 5ºF, would it be better to use one
    of each, so the state change occurs at different times as the contents warm (say over 2 days) or 2 of the same, so that the state change occurs at the same time but takes more energy?

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  • From dlzc@21:1/5 to timewethink on Tue Aug 9 08:06:35 2022
    Dear timewethink:

    On Tuesday, August 9, 2022 at 7:45:05 AM UTC-7, timewethink wrote:
    I recently bought two types of Arctic Ice brand freezer blocks,
    one freezes at 28.4ºF one freezes at 5ºF, would it be better to
    use one of each, so the state change occurs at different times
    as the contents warm (say over 2 days) or 2 of the same, so
    that the state change occurs at the same time but takes more
    energy?

    Your insulation system is unlikely to perform well with 5°F "ice". So mostly that one gets shot first, with a much higher heat rate from ambient. Contents are colder... 'extra' cold does not buy you any better food protection.

    Maximize insulation, minimize temperature difference.

    I also had a crappy "cool bag" that I somehow thought was "water proof". The ice was melting, and the water was dripping out the bottom... so it could not conduct / convect heat to the walls of the "cool bag". One bag of ice lasted for almost a day,
    and food was cold the entire time. Don't get that with the typical styrofoam cooler.

    David A. Smith

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  • From Mattismoore@21:1/5 to All on Fri Jun 30 21:02:26 2023
    Water saturated with gelatin.

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