刘伟, 杨洲, 段洁利, 等. 蓄冷式冷藏箱降温过程的数值模拟及试验验证[J]. 华南农业大学学报, 2019, 40(4): 119-125. DOI: 10.7671/j.issn.1001-411X.201810001
    引用本文: 刘伟, 杨洲, 段洁利, 等. 蓄冷式冷藏箱降温过程的数值模拟及试验验证[J]. 华南农业大学学报, 2019, 40(4): 119-125. DOI: 10.7671/j.issn.1001-411X.201810001
    LIU Wei, YANG Zhou, DUAN Jieli, et al. Numerical simulation and experimental verification of cooling process in cool storage refrigerator[J]. Journal of South China Agricultural University, 2019, 40(4): 119-125. DOI: 10.7671/j.issn.1001-411X.201810001
    Citation: LIU Wei, YANG Zhou, DUAN Jieli, et al. Numerical simulation and experimental verification of cooling process in cool storage refrigerator[J]. Journal of South China Agricultural University, 2019, 40(4): 119-125. DOI: 10.7671/j.issn.1001-411X.201810001

    蓄冷式冷藏箱降温过程的数值模拟及试验验证

    Numerical simulation and experimental verification of cooling process in cool storage refrigerator

    • 摘要:
      目的  研究蓄冷式冷藏箱降温过程中的温度变化速率和温差。
      方法  采用CFD模拟软件对冷藏箱内流场进行非稳态数值模拟;建立包括冷藏箱内部和外部环境在内的三维耦合模型;分析蓄冷式冷藏箱降温过程中贮藏室内温度场分布规律;得出贮藏室内横截面和纵截面流场分布图。基于所建立的模型,研究不同风机风速、回风道面积和冷条初始温度对贮藏室流场的影响。
      结果  模拟结果表明,冷藏箱可以在8 min内将贮藏室温度从16 ℃降低到0 ℃,正对回风道的区域温度较低,其他区域温度分布比较均匀。模拟结果与试验结果比较吻合,贮藏室温度变化平均绝对误差为0.68 ℃,温度分布平均绝对误差为0.29 ℃。提高风机风速,增大回风道面积,降低冷条初始温度可以缩短降温的时间,贮藏室温度变化速率随着降温时间逐渐减小;贮藏室内的温差随风速的增加而减小,随回风道面积的增大和冷条初始温度的降低而增大。
      结论  该研究结果可为蓄冷式冷藏箱降温参数的优化设计提供一定的参考。

       

      Abstract:
      Objective  To study the temperature change rate and temperature difference during the cooling process of cool storage refrigerator.
      Method  CFD simulation software was used to simulate the unsteady flow field in the refrigerator. A three-dimensional coupling model including the internal and external environment of the cooler was established. Distribution of temperature field in the storage room was analyzed during the cooling process of cool storage refrigerator. The flow distribution diagrams of cross and longitudinal sections in the storage room were obtained. Based on the established model, the effects of different fan speed, return duct area and initial temperature of cold strip on the flow field in the storage room were studied.
      Result  The simulation results showed that the refrigerator could reduce the temperature of the storage room from 16 ℃ to 0 ℃ within eight minutes. The temperature in the area directly opposite to the outlet duct was relatively lower, and the temperature distribution in other areas was more uniform. The simulation results were in good agreement with the experimental results. The average absolute error of temperature change in the storage room was 0.68 ℃, and the average absolute error of temperature distribution was 0.29 ℃. The cooling time could be shortened by increasing the fan speed and increasing the return duct area, or by decreasing the initial temperature of the cold strip. The rate of temperature change in the storage room decreased with the cooling time. The temperature difference in the storage room decreased with the increase of the fan speed and increased with the increase of the return duct area and the decrease of the initial value of the cold strip temperature.
      Conclusion  The research results provide references for optimizing cooling parameters of cool storage refrigerator.

       

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