| 摘要: |
| 通过建立均相流模型，对四种制冷剂重力再循环蒸发器进行理论分析，并搭建重力再循环制冷系统实验台，在不同工况下对实验结果与理论计算结果进行对比。以R404A为例，在保温体内空气温度从0 ℃下降到-25 ℃情况下，传热系数的理论值与实验值的偏差从15.91%逐渐减小到3.01%，制冷量的理论值与实验值的偏差从14.43%逐渐减小到2.07%。保温体内空气温度越低，偏差的幅度越小，重力再循环制冷系统的运行状态和理论运行状态较吻合。应用该模型对四种制冷剂运行状态进行预测，预测结果显示，相比于其他三种制冷剂，在液柱高度较低的情况下，R407C的传热系数和制冷量最大。 |
| 关键词: 再循环蒸发器 对比 理论分析 实验研究 |
| DOI： |
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| 基金项目:天津市高等学校科技发展基金计划重点项目（160024）资助。 |
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| Theoretical Calculation and Experimental Research of Four Refrigerants on Gravity Recirculation Evaporator |
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Ruan Jianwen, Zang Runqing, Zhao Dong, Sun Zhili
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| (Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Refrigeration Engineering Research Center of Ministry of Education, Tianjin Refrigeration Engineering Technology Center) |
| Abstract: |
| The homogeneous phase flow model was established to analyze gravity recirculating evaporators in the condition that four kinds of refrigerants are used respectively. The experimental device of gravity recirculating refrigeration system was set up, and the experimental results were compared with the theoretical calculation results under different working conditions. Taking R404A as an example, when the air temperature in heat insulation decreased from 0 ℃ to -25 ℃, the deviation of the experimental value from the theoretical value of the heat transfer coefficient lowers from 15.91% to 3.01% gradually. The deviation of the experimental value from the theoretical value of the cooling capacity decreases from 14.43% to 2.07%. The lower the air temperature in heat insulation is, the smaller the deviation becomes, which indicates that the running state of the gravity recirculating refrigeration system is in better agreement with the theoretical operating state in lower temperature. This model was used to predict the running states of the four refrigerants. And it shows that comparing with the other three refrigerants, the heat transfer coefficient and cooling capacity of the R407C are the highest when the supplying height is in a relatively low level. |
| Key words: gravity recirculation evaporator comparison theoretical analysis experimental research |
