This required pushing the RIGID compressor's speed higher than I would like to see it sustained at indefinitely. But with that said, current draw was not unreasonable, and compressor discharge temperature was still comfortable, well within the manufacturer's spec.
These test results were done with the evaporator coil wrapped in about 1-2" of loose fiberglass insulation, stuck inside a plastic bag to act as a vapor barrier. Nothing very sophisticated, and judging by a few frost spots I was seeing on the outside, far from perfect.
|Test Data (Click on Image to Enlarge)|
Based on these preliminary tests, I would think it safe to say that a -85°C bio-storage freezer could be built utilizing this technology, while still allowing a good margin of extra temperature capability.
It wouldn't be a very big bio-freezer, but it would certainly be the smallest ever built for this temperature range, and definitely the smallest AutoC version in existence. Of course if someone would like to challenge this assertion, I would be thrilled to hear from you, and see what you have created and/or discovered. Now I just need to get to work and create one myself based on the CryoSPRITE technology used in this first prototype.