Report overview
The report was signed by Cynthia, Brittany, Elise, Josh, and Graham Gipson; their team website is here and has extensive documentation. - four nested styrofoam cups were covered in various layers of bubble tape, more sytrofoam, and insulative tape were filled with an ammonium-nitrate, water mixture to create a container that remained below 10degC for 10hrs at a cost of $2.
- a good deal of heat-transfer modeling work was also listed
- compiles other potential endothermic reactions on page six of the final report
- did some thinking about zeer pots
- mentioned the GreenBox, a product made by Entropy Solutions, that can maintain a temperature from -20degC to 50degC for two to four days. The customer specifies their target temperature and ES customizes an insulation layer that will correspond to that temperature. All the materials are supposed to be eco-friendly, hence the "Green." The product is designed for shipping needs.
Comments
There was a passing comment in the paper about ammonium-nitrate being readily available but this was not expanded further. There's also no indication about the lifetime of these devices. I would presume they're one-time use; this isn't too much of a problem if they're so cheap though. There's a noticeable lack of information on the amounts of reagent used in the tests. | 
