湿冷预冷是采用风幕柜机械制冷、蓄积冷量的方法得到0.5℃的冷水，然后通过换热器使风幕柜内空气与冷水进行直接接触的热、质交换，获得接近冰点温度的高湿空气，再经强制通风用这高湿空气来冷却物料，冷却速度比常规空气冷却方法快1倍以上;

　　保鲜效果好，能同时提供高湿、低温而利于果菜贮藏的综合条件;可以有效地抑制生物体的呼吸作用和微生物的繁殖，防止物料在冷藏期间失水萎蔫，有利于保持果菜的新鲜程度;适用于多数果菜的预冷和风幕柜储藏保鲜，果菜对湿冷预冷方法的适应率高于空气冷却、冷水冷却和真空冷却方法;

　　湿冷系统采用间接冷却方法，具有蓄冷作用，可降低制冷机组装机容量，电能消耗低;湿冷保鲜风幕柜造价低，产品可随进随出，使用方便。

　　湿冷系统目前主要用于果菜的预冷和短期保鲜贮藏(1～2周)，鱼、肉的微冻保鲜，要实现长期保鲜，还需设紫外线照射等其它杀菌消毒的辅助手段。

　　真空预冷就是将果菜放在真空风幕柜预冷室内，用真空泵抽真空，造成一个低压环境，使果菜内部水份得以蒸发，由于吸收蒸发潜热，果菜自身被冷却。
 

　　Wet cooling is used in refrigeration, the amount of accumulation of cold air curtain display cabinet mechanical cold water of 0.5 DEG C, and then through the heat exchanger, the air curtain of air and cold water tank direct contact heat and mass exchange, get close to the freezing temperature of the humid air, and then by the forced ventilation with high humidity air cooling material, cooling faster than the conventional air cooling method is 1 times faster;

　　The preservation effect is good, can also provide comprehensive conditions of high humidity and low temperature for fruit and vegetable storage; can effectively inhibit the respiration of organisms and the reproduction of microorganisms and prevent dehydration during storage and wilting, is conducive to maintain the freshness of fruits and vegetables; pre cooling and air curtain cabinet storage for the majority of fruit and vegetable, fruit and vegetable to adapt to the cold cooling method was higher than that of air cooling, water cooling and vacuum cooling method;

　　Humidicold system using indirect cooling method, with cold storage function, can reduce the refrigeration unit installed capacity, low power consumption; cold fresh air curtain has the advantages of low cost, the product can be used conveniently.

　　Humidicold system is mainly used for fruit and vegetable pre cooling and short-term storage (1~2 weeks), micro freezing fresh fish and meat, to achieve long-term preservation, aid needs to be provided with ultraviolet radiation and other disinfection.

　　Vacuum precooling is to put fruits and vegetables in the pre cooling room of vacuum air curtain cabinet, vacuum pump is used to vacuum, resulting in a low pressure environment, so that the moisture in the fruit and vegetable can evaporate. Because of absorbing the latent heat of evaporation, the fruit and vegetable are cooled themselves.