An air-cooled water chiller is a crucial refrigeration system. It works by circulating a refrigerant through a closed loop. The compressor compresses the refrigerant gas, raising its temperature and pressure. This hot gas then passes through the condenser, where air cools it down, causing it to condense into a liquid. The liquid refrigerant then flows through the expansion valve and enters the evaporator. In the evaporator, the refrigerant absorbs heat from the water being cooled, turning back into a gas.