Short term, Light weight, Low volume Refrigeration Design

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Bland67
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Hello Guys,

This is my first time posting here - just wondering if anyone has some insight on a project that I am working on. I want to be able to temperature control an insulated shoe box sized volume at ~5 degrees Celsius for about 20 minutes. The main constraints are that I would need the temperature control system to be lightweight (<1kg) and occupy only a small fraction of the shoe box volume.

Any ideas would be welcomed! I would rather not just throw a block of dry ice in the container, though.

Brandon
 
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Bland67 said:
lightweight (<1kg) and occupy only a small fraction of the shoe box volume.
Bland67 said:
just throw a block of dry ice in the container
You've about optimized it.