Now that’s a considerable set of criteria! I guess there’s a reason they call it an ‘innovation challenge’.
A solution/system that can meet both the refrigeration and freezing criteria (temperatures) will be tricky…but probably doable (with some very clever low-tech design/engineering).
I have one question/issue with the freezer temperature criterium: “0°F (-18°C)” this seems extreme to me (note: ‘freezing’ in Fahrenheit = 32°, which is 0° C)…is that freezing temperature correct? If so, how was this determined?
At first glance, the scalability criterium (linking of 2 units) is unclear to me – does this mean either two freezers or two fridges, or, one freezer and one fridge? This criterium may prove to be the most challenging (due to the temperature differential) of all.
The duration/time factor (week long, 24/7, with demo of 8 hour disruption to service) will add to the difficulty factor; I think some clarification of the ‘8 hour disruption to service’ is needed: disruption to what/which service? The existing grid’s electrical power feed? Why 8 hours (is this the time for fresh meat or dairy to spoil?). CLARIFY PLEASE.
How was the ‘100 liter’ storage capacity determined? Is that the total capacity (freeze and fridge) or for one module (freezer OR fridge)? Is this the estimated cold food storage space needed for a family of a given size? Just one person?
The foregoing being said, I understand most all of the criteria and their (probable) rationales for inclusion (though the ‘life time’ benchmark of 15 years will need to be hypothetical [extrapolated from the prototype demo] and/or modeled by computer simulation using the demo’s parameters).