For most foods, cold storage can not prevent food from spoilage as can storage, dehydration or frozen storage, but can only slow down the deterioration speed of food. Therefore, it is actually a storage technology with relatively weak effect. However, not all foods can prolong the shelf life under cold storage conditions. For example, some tropical and subtropical fruits and some vegetables will suffer from chilling injury if stored at 3 ~ 10 ℃ above their freezing point, and the aging rate of bread will accelerate at low temperature.
Cold storage is a method to preserve the frozen food under the cold storage temperature (often above the freezing point).
Especially for fruits and vegetables, it is mainly to delay their life metabolism and maintain their freshness.Generally, the refrigeration temperature is - 1 ℃ ~ 8 ℃.
The cold storage with this temperature is often called high-temperature cold storage. By reducing the rate of biochemical reactions and changes caused by microorganisms, refrigeration can prolong the shelf life of fresh food and processed products.
Cooling fan as a kind of cold storage evaporator. The cooling fan is the equipment that outputs the cooling capacity in the refrigeration system, mainly composed of cooling coil and axial fan. The axial fan of the cooling fan is responsible for the forced convection circulation of the cold storage fan and the air in the cold storage through the forced action to achieve the purpose of cold storage refrigeration. Cold storage fan is mostly a complete set of equipment consisting of axial flow fan and cooling ducts. Cooling fan according to the way used to cool the air can be divided into dry, wet and mixed dry and wet three. Among them, the refrigerant or refrigerant carrier in the flow of the exhaust pipe, through the wall of the tube to cool the air outside the tube is called dry chiller; to spray the refrigerant carrier liquid directly and the air for heat exchange, called wet chiller; hybrid chiller in addition to cooling the exhaust pipe, there is a refrigerant carrier spray device.
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