Precautions for air cooler selection:
A: Air cooler frosting: When the working temperature of the air cooler is lower than zero or lower than the air dew point, frost begins to form, and the frost thickness reaches a certain level, which will cause the heat transfer of the air cooler to decrease. The coefficient decreases, the thermal resistance increases, and the wind resistance increases, which affects the heat exchange of the air cooler, so defrosting should be carried out.

What are the precautions before the operation of refrigeration equipment?