苹果压差预冷包装箱开孔优化与能耗分析

Opening Optimization and Energy Consumption Analysis of Apple Differential Pressure Pre-cooling Package

建立红富士苹果压差预冷数学模型,采用CFD软件对其进行数值模拟,对比4种开孔直径(20、30、40、50 mm)下冷却效果与预冷能耗的差异。结果表明,在包装箱进出口压差一致的前提下,随着开孔直径的增加,预冷时间逐渐减少,同时预冷能耗逐渐增加,增幅达到16.75%。故在考虑压差预冷最佳时间时不可忽略预冷能耗。预冷的均匀程度与开孔直径没有明显的函数变化关系,但随着开孔直径变化,最大的不均匀程度变化率达到17.37%。故综合考虑预冷时间、预冷能耗、预冷均匀程度等因素,可以得到最佳的包装箱开孔直径为40 mm。

The simulation models of differential pressure pre-cooling for red Fuji apple are established. The model are numerically simulated using CFD software, and the differences in the cooling effects of the four opening diameters are compared. The results show that keep the uniform pressure drop at the inlet and outlet of the box, with the increase of the opening diameter, the pre-cooling energy is gradually reduced while the pre-cooling energy consumption is gradually increased, and the increase rate reaches 16.75%. Therefore, the pre-cooling energy consumption cannot be ignored when considering the pressure differential pre-cooling optimal time. The uniformity of the pre-cooling is not significantly related to the diameter of the opening, but as the diameter of the opening changes, the biggest rate of change in theTherefore, considering the influence of pre-cooling time, pre-cooling energy consumption, and pre-cooling uniformity, the optimal box opening diameter should be 40 mm.