TECHNICAL
technology eliminates any infrastructure for the dielectric liquid. Instead, the liquid is circulated by natural means and does not leave the immersion system. The liquid circulates by the heat generated by the IT equipment and water-cooled convection drives, which means that the primary circulation is completely driven by the thermal expansion of the liquid and gravity. The only requirement for heat rejection is any common liquid coolant infrastructure. This approach enables immersion cooling to be both climate independent (free cooling up to 48 degrees Celsius) and fully heat reuse ready (more than 98% energy transformed into hot water). Each system comes with a smart sensor- based monitoring and management control system, which supports common datacentre management protocols e.g. MODBUS, OCP-UA and RESTful. Enclosed and Self-Contained The focus is on compute, as IT is at the basis of every platform or datacentre. All other aspects of a server, rack, cooling or even power system only facilitate the IT. Immersion cooling allows for a shift in focus from cooling to compute. The self- contained approach allows for a much deeper level of integration than any other rack or liquid solution. Everything required to facilitate and manage IT like power and data connectivity is integrated and fully manageable. Each PNC tank is equipped with two integrated heat exchangers. Left and right. Both heat exchangers require a water feed and a return connection. Integrated power distribution is used
Multiple immersion cooling tank deployment in their packaging
Immersion cooling platforms Immersion cooling platforms such as Perpetual Natural Convection (PNC) and Direct Forced Convection (DFC) not only optimise cooling efficiency but also align with global green initiatives. By minimising energy consumption and utilising environmentally friendly fluids, immersion cooling technology contributes significantly to reducing the carbon footprint of the datacentre. The PNC platform offers ultra-low energy overhead (circa 100W overhead out of 44kW capacity per tank) and is the most efficient immersion cooling solution on the market. The DFC platform is designed for enhanced thermal performance and scalability, with high power cooling exceeding 2kW per processor. PNC Platform The PNC tank allows for twenty-four 1U 21” wide servers to be integrated, with two additional switches, and the solution is designed to meet the demand for high density compute both on a system and server level. The 21” wide server space allows OEMs and integrators flexibility to design innovative servers utilising the full potential of sustainable datacentre cooling. The ensured high quality of the immersion technology is facilitated by the purity of the dielectric fluid, the lack of moving parts and the fact that everything in touch
with the fluid has been thoroughly tested and certified before commissioning. No air is ever mixed into the fluid in the system and the lid is closed by default, since a closed lid improves the effectiveness of the thermodynamic process. This prevents oxygen from reacting with the fluid. The thermal stability of the fluid is also guaranteed by liquid quality and extensive safety mechanisms which are integrated into the cooling tanks. Natural Convection Flow Passive circulation of the single-phase dielectric fluid is where this technology is unique and ground-breaking. The PNC
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Volume 46 No.4 DECEMBER 2024
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