HVAC in chiller refers to the heating, ventilation, and air conditioning system used in chillers. Chillers are large, industrial cooling systems that use a refrigerant to cool air or liquid. The HVAC system in a chiller is responsible for controlling the temperature, humidity, and air quality of the environment. It consists of a compressor, condenser, evaporator, and expansion valve, which work together to cool the air or liquid. The HVAC system also helps to maintain the desired temperature and humidity levels in the environment, ensuring the optimal performance of the chiller.