These water-bearing ceilings work just like regular air conditioning units, except that there is a heat exchanger in between and the water in the ceiling is cooled only slightly below 20 °C. However, the surface area is larger. I also know this from industrial buildings. But it has not proven effective and, to my knowledge, has not been built for years. The problem is the humidity. Everything condenses on the ceiling. This could be kept within limits if new water did not constantly enter the room, because:
-ventilation is done alongside (someone in the office is always too cold)
-public traffic ensures air exchange (doors opening and closing)
-ventilation system runs
Unlike a normal split unit, no condensate is discharged, so the moisture input is essentially a one-way street.