AN IMMERSION COOLING SYSTEM

A cooling system for cooling of a heat generating electrical component, in particular to reduce the likelihood of overheating of electrical components or chemical breakdown of coolant fluid. The cooling system has a coolant liquid to absorb excess energy from the heat generating electrical component, the coolant liquid having an energy input threshold above which chemical breakdown of the coolant liquid occurs. A cooling module defines a volume containing the coolant liquid, wherein the heat generating electrical component is mounted within the volume and immersed in the coolant liquid. A power input is arranged to supply power into the cooling module to the heat generating electrical component, and a power regulator is provided external to the volume of the cooling module and connected to the power input so as to regulate the power supplied into the cooling module. Cooling systems are also described having coolant liquid comprising dissolved oxygen, having at least one element arranged within the volume comprising aluminium and/or aluminium oxide, and/or having a sealed volume with at least one seal which opens at a predetermined pressure or temperature corresponding to a temperature below the temperature at which the coolant liquid breaks down.