The water supply of the nozzle is repeatedly switched on and off at a high enough frequency, ensuring that the desired cooling intensity is directly proportional to the duty cycle. The water pressure does not need to be changed; thus, the nozzle design can be perfectly optimized for a very narrow supply-pressure range to guarantee a homogenous, constant spray pattern, without any trade-off between an extension of the control-range and good spray pattern uniformity. Further optimizations with regard to droplet size and speed (and therefore impact), and robustness against clogging and scaling can be achieved without compromise.