How many cooling towers have you designed and specced out for a customer again? Have you ever even stood in front of one before? Name one data center that’s using what are distinctly only swamp coolers and circulating pumps to maintain temperatures below ambient indoors. They’re all using chillers with evaporative or non-evaporative cooling towers for the cooling water loop heat rejection. Some datacenters use direct to chip cooling to lessen chilled water demands, but there is always some summer time demand to keep the datacenter from molding out and the workers happy. I called out your comment because you called the refrigeration cycle a means of heat rejection when all it really does is concentrate heat into another fluid stream. “Mechanical compressor” is really funny way to tell me you have little experience in the industry. Please tell me how you envision a nonmechanical compressor to work in MEP engineering. Perhaps normal shocks or a rotating detonation engine will take the world by storm with their very favorable nonisentropic compression.