Patent ID: 8105439

Claim:
A method for self-cleansing limescale accumulated on a first heat exchanger in evaporative cooling equipment, wherein the first heat exchanger includes a plurality of fins and a refrigerant pipe passing through the fins, comprising steps performed during evaporative cooling of: transporting cooling water in a water tank upwardly to a water-spraying element via a water pipe by means of a water pump; spraying the cooling water on the fins and the refrigerant pipe of the first heat exchanger, and the cooling water flowed downward along the fins being collected in the water tank; setting the water pump to operate for a first period, and then stopping the water pump; causing temperature of the fins and the refrigerant pipe to periodically rise by stopping the water pump from spraying water to the first heat exchanger for a second period, until the first heat exchanger is expanded due to thermal expansion and the limescale attached to the first heat exchanger are detached; turning on the water pump to flush the limescale and accumulated particles in the water tank by the cooling water in the water tank, and exhausting the cooling water with the accumulated particles and the limescale; and adding clean cooling water to the water tank.