Passive 2-phase immersion cooling is not the same as mineral oil cooling. Mineral oil is not very efficient compared to passive 2-phase immersion cooling, because it requires noisy and power hungry oil pumps and oil filters in addition to a secondary cooling loop with heat exchangers and water-pumps.
Mineral oil also doesn’t allow high density deployments, because heatsinks are still required. Heat sinks still need to be assembled to boards, and in worst case thermal grease needs to be cleaned up and replaced by expensive indium foil in order to avoid the oil from becoming milky. Oil in general is extremely messy, while with 2-phase immersion fluids boards come out dry.
Mineral oil is also flammable and will require compliance with government regulations and approval by fire departments, as well as specialty insurance. The working fluids we use in passive 2-phase immersion cooling systems are non-flammable, eco-friendly and the fluids are reusable for 30 years.
Oil cooling is a single phase heat transfer process (= it never changes from liquid to vapor phase), while the magic of the passive 2-phase immersion cooling process comes from evaporation.
Oil cooling does not eliminate the time consuming and expensive mechanical structure, it introduces new points of failure.
You’ll find some more info in this blog here and in the FAQ here.
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