真空冷却是在真空下水分快速蒸发的预冷技术，可用于食品尤其适于叶类蔬菜的冷却。
Vacuum cooling is a rapid evaporative cooling technique under vacuum, which can be applied to specific foods and in leafy vegetables.
为了节约能源，当制冷系统采用水冷冷冻水机组+自由冷却系统时，有制冷、预冷、自由冷却三种运行模式。
In order to save energy, when refrigeration system using water frozen water units + free cooling system, have refrigeration, precooling, free cooling three operating mode.
果蔬差压通风预冷包装箱的开孔大小及包装箱两侧的压差是影响预冷速度、冷却均匀性的重要参数。
The vent hole size and the pressure drop are the important parameters which affect cooling rate and cooling uniformity in pressure pre-cooling of fruit and vegetable.
针对气体车间制氮装置预冷空气温度过高的问题，提出了利用冷媒水降低预冷空气温度的措施及工艺改造方案，并对空气冷却器的工艺计算做了较详细的介绍。
Since the pre cooling air temperature of nitrogen unit is too high, the measure and process design scheme for using the refrigerant water to reduce the pre-cooling air temperature are recommended.
并以某小型涡喷发动机为例，沿飞行轨迹计算分析了射流预冷却对发动机性能的影响。
Taking the certain small scaled turbojet as an example, the influence by mass injection and pre-cooled engine was calculated and analyzed along fly trajectory.
介绍了空气预冷系统的不同流程以及喷淋式、塔板式、填料式冷却塔，分析了其优缺点；
The paper describes the different processes relating to air precooling systems and cooling towers of spray type, perforated plate type and packed type with their advantages and deficiencies analyzed.
介绍了空气预冷系统的不同流程以及喷淋式、塔板式、填料式冷却塔，分析了其优缺点；
The paper describes the different processes relating to air precooling systems and cooling towers of spray type, perforated plate type and packed type with their advantages and deficiencies analyzed.
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