It relies on fans to force the air inside the warehouse to flow through the cooling ducts inside the box for heat exchange，Cool the air，Thus achieving the goal of reducing the storage temperature。among which，Refrigerant or refrigerant flows inside the exhaust pipe，A dry air cooler that cools the air outside the pipe through the pipe wall is called a dry air cooler；Directly exchanging heat between sprayed refrigerant liquid and air，Known as wet air cooler；Hybrid air cooler, except for cooling ducts，There is also a spray device for refrigerant。The commonly used dry air coolers in cold storage are divided into two types according to their installation positions: ceiling mounted and floor mounted