For anyone that doesn´t know:
As far as I can tell, grcooling is a form of immersion cooling, utilizing a "standard" 1-phase cooling liquid.
This is correct, we use an oil based dielectric coolant, which is much more cost effective than a two phase cooling approach. Two phase cooling fluids typically cost about $200 per gallon, while oil based liquid coolants are orders of magnitude cheaper. We can handle rack densities of over 100 KW per rack, with a cooling overhead energy use of about 3%. We can achieve this in any climate on the globe. If you can find me flat level ground, Available Power, communications and a roof, I can build you one of the most efficient, cost effective data centers on the planet. Please see below a link to a youtube video of what our cooling units typically look like in action.
https://www.youtube.com/watch?v=6IX9U2zaI_II would be happy to answer any questions.
Cheers,
Brandon