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Questions on phase change heat/cooling?

Charis

Charis

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I'm not quite sure how to phrase my question but here goes and hopefully everyone understands what I'm actually asking.

I've been looking into the various phase change heat/cooling shipping packs and panels like the Phase 22 panels at Josh's Frogs and some of the Cryo Paks that other supply stores sell. Does anyone have a clear, easy to understand tutorial on how these work? I don't really understand how to compare the various types to decide which are the best for my needs.
And I'd be happy for any recommendations on where to buy them that anyone has as well.
Thanks!
 
Phase change panels (phase 22) work by absorbing and/or releasing heat to keep the package within a specific temperature range. The temperature range is determined by the material that the PCM panel is made of. For example, if the panel is designed to keep things at 75F, it will start absorbing heat if the temp is above that, and the panel will turn liquid. If the temp drops below that, the PCM panel starts releasing the stored energy, and turns solid. I use them a lot by themselves, and sometimes with a heat or cool pack. I'm not sure that is the best explanation but hopefully it helps a little.
 
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