Abstract: A method for energy optimisation between computing modules and a greenhouse, other building or industrial process equipment to be heated, including the steps placing a mobile unit at a site of the greenhouse, other building or industrial process equipment to be heated, including one or more computing modules, a cooling arrangement for cooling the computing modules including one or more closed-loop coolant circuits having an immersion enclosure and a pump; arranging the computing modules in the immersion enclosure of each of the one or more coolant circuits; and filling the immersion enclosure with liquid coolant to at least partially immerse the computing modules in the liquid coolant, performing computing tasks with the computing modules whereby heat is generated; and guiding the generated heat away from the computing modules towards the greenhouse, other building or industrial process equipment to be heated by means of immersion cooling with the liquid coolant.