What is the advantage of chilled water air condition system?
One advantage of chilled water air condition system is that if the chilled water piping leaks somewhere in the building, only water is lost, and repairs only require plumbing work. In comparison, with standard air conditioning, a leak in a refrigerant line inside the building will probably require brazing, leak testing with nitrogen, evacuation of the system, and recharging with a refrigerant that is a lot more expensive than water.
Another advantage of chilled water air conditioning is that if air stops flowing through the cooling coil, the chilled water will simply return to the chiller. Since the water will not have picked up any heat, it will still be cold, and the chiller will respond by unloading and turning off. With standard air conditioning, if air stops flowing through the cooling coil, there is a possibility that liquid refrigerant will return to the compressor and damage it.