The general principle of water chiller operation is the application of temperature rise or decrease in the material state's physical transition (from solid, liquid to gas and vice versa). Precisely, the process of matter changing from a solid to a liquid then to a gaseous form will capture the environment’s heat, causing the surrounding air to lose heat and cool.   The reverse transformation (from a gas to a liquid to a solid) will exude heat. These two processes are carried out continuously in the chiller, forming a closed cycle.