Food freezing process during freeze，Release of heat of an exothermic process is actually inhomogeneous，Therefore, the cooling equipment cold freezing process is not uniform for an。

The freezing process of food consists of 3 stages：

1.cooling phase：Since the temperature of the food is higher than 0 ° C down to about 0 ° C；

2.ice crystal formation stage：The temperature of the food of about 0 ° C down to about -5 ° C；

3.Freeze cooling stage：The temperature of the food down to -5 ° C -15 ° C approximately。

in 3 stages of food freezing，2Large amount of cooling required for the stage，At this stage the equipment room with frozen should all put into operation，while in stages 1 and 3，Per unit time due to less heat load，It may be appropriate to reduce wind speed，Reduce the amount of wind，In order to achieve the purpose of energy access。Frozen using conventional chiller is only one speed，Can not adjust，If the cooling fan is equipped with a two-speed or variable speed motor，Wind cycle can be adjusted frozen，So as to save energy。