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“ By reducing heat rejection, it’ s almost what’ s termed as free cooling,” Stephen explains.“ Because you have the immersion environment, all the heat is being taken away by the dielectric fluids, and then you just need to cool down the dielectric fluids with a cooling loop.
“ Additionally, because of the high temperatures of operating, you don’ t need to do any kind of refrigeration activity, you don’ t need to use any water to accelerate the cooling process. This means you dramatically decrease the amount of energy you use, both from a cooling side, but also now your servers don’ t have fans in them anymore. So even on the IT side, you’ re saving a lot of power.” Traditional cooling methods often require substantial amounts of water for evaporative cooling. By reducing water consumption, Castrol hopes to address a growing concern for data centre operators, particularly in regions where water scarcity is an issue.
“ Liquid cooling, specifically immersion cooling, has a benefit of energy saving up to 30 % and water consumption reduction of about 80 %,” Sung quantifies, based on the company’ s research.“ So, in the long run, it adds a reduction of the total cost of ownership for data centre owners.”
Beyond operational efficiency, Castrol is also considering the entire lifecycle of its cooling fluids. Chris explains:“ At Castrol, we’ ve got a circularity strategy where we can collect our fluids at the end of their lifecycle and reprocess them into fresh fluids, making that a more sustainable solution.”
142 July 2025