| 摘要: |
| 本文为了研究不同因素对白萝卜差压预冷的效果，引入了Pearson相关系数以及正交试验法，计算得到白萝卜差压预冷过程中温度和均匀度二者相关度较高，Pearson相关系数绝对值为0.875。基于正交试验法，以降温速率和冷却均匀度为评价指标，计算并分析可得：对降温速率的影响程度由大到小依次为孔隙率、送风温度、开孔率、风速；对冷却均匀度的影响由大到小依次为送风温度、孔隙率、风速、开孔率。正交试验结果表明：送风温度越小、风速和开孔率及孔隙率越大，降温速率越大；送风温度和孔隙率越大、风速和开孔率越小，均匀度越小。实验的优化预冷条件为：送风温度为3 ℃、风速为0.32 m/s、包装箱开孔率为0.08、孔隙率为0.48。 |
| 关键词: 差压预冷 温度均匀度 降温速率 正交试验法 白萝卜 |
| DOI： |
| 投稿时间：2017-07-14
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| 基金项目: |
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| Effect of Different Factors on Differential Pressure Pre-cooling of White Radish |
| Shen Jiang,Wu Dongxia,Li Shuai |
| (Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce) |
| Abstract: |
| To study the effect of different factors on the differential pressure pre-cooling of white radish, we use the Pearson correlation coefficient and the orthogonal experimental method. The absolute value of the Pearson correlation coefficient between temperature and uniformity in differential pressure pre-cooling of white radish was 0.875, and the two were strongly correlated. Based on the orthogonal experimental method, taking cooling rate and cooling uniformity as evaluation indexes, the degree of influence on the cooling rate in decreasing order is porosity, air supply temperature, opening rate, and wind speed; the degree of influence on cooling uniformity in decreasing order is air supply temperature, porosity, wind speed, and opening rate. The orthogonal test results show that the smaller the air supply temperature, the greater the wind speed, opening rate, and porosity, and the greater is the cooling rate；the greater the supply air temperature and porosity, the smaller the wind speed and opening rate, and the smaller is the uniformity. The optimized experimental precooling conditions are as follows: the air supply temperature is 3 ℃, the wind speed is 0.32 m/s, the packing box opening rate is 0.08, and the porosity is 0.48. The application of the orthogonal test method and the reference of Pearson correlation coefficient improve the efficiency of the experiment and the accuracy of variable analysis. |
| Key words: differential pressure pre-cooling temperature uniformity cooling rate orthogonal experimental method white radish |
