They use adiabatic coolers to minimize electrical cost for cooling and maximize cooling capacity. The water isn’t directly used as the cooling fluid. It’s just used to provide evaporative cooling to boost the efficiency of a conventional refrigeration system. I also suspect that many of them are starting to switch to CO2 based refrigeration systems which heavily benefit from adiabatic gas coolers due to the low critical temp of CO2. Without an adiabatic cooler the efficiency of a CO2 based system starts dropping heavily when the ambient temp gets much above 80F.

They could acheive the same results without using water, however their refrigeration systems would need larger gas coolers which would increase their electricity usage.

Yup. We recently hired a guy straight out of the HVAC-R program of our local tech school and he barely had any refrigeration knowledge. Aparently they only teach you barely enough about refrigeration to get an EPA cert and nothing beyond that.

Hell, out of the three new techs we got recently, the one who actually went to tradeschool is the least competent. If you want to get into the trades straight out of highschool you best bet is to just start with a manual labor job for a year or so so you have something to put on a resume that show you can work. After that just apply for a low level position in your trade of choice. Once you’re in your employer should be paying for you to get any certs that you need.