H134a was the refrigerant. (I was somehow expecting something else with centrifguals.)
Curious if anyone has ever done central cooling whether for multiple buildings or even just one building where they send out liquid refrigerant and have a suction line as the return. I suppose the cost of refrigerant would make this costly especially if there is a leak but it would give the benefit of the liquid to gas state change (think steam heat vs. hot water) so less to pump around and maybe less wasted cooling along the way. Could such a thing even work?
PS: I knew they operated compressor-type chillers before I went there but still would have been more interested in absorption chillers as making cold with heat is, well, cool.