What is the working principle and function of Orchard Fan？

Under normal circumstances, the temperature of nature is decreased with the rise of height, but in early spring "reverse cold" conditions when frost occurs, in a certain height range the temperature is increased with the rise of height. This phenomenon is called "inversion phenomenon".  Under the condition of temperature inversion, the air temperature is about 3℃ ~ 5℃ higher than the ground temperature at a height of 7 ~13 meters above the ground.  

Orchard frost fan is a kind of purpose built big fan supported from the ground 10 meters above height with steel tube.  When frost occurs, start the special big fan. The above higher temperature of air continuously blows to the lower low temperature area of fruit tree, so that the upper and lower air are mixed warming to improve the ground temperature, and avoid the temperature around fruit tree drop below 0℃.  At the same time, because of the large power of fan disturbing air near ground, the formed microzone airflow blows away moisture, reduces the formation of dew, and prevents from the frost or ice. Even a slight frost is formed, the formed microzone airflow, due to orchard fan disturbing air again near ground at defrosting period, can reduce the defrosting speed, so as to reduce primary and secondary cold injury of the fruit bud.