车用微小通道蒸发器一维仿真与试验

One Dimensional Simulation and Experimental Study of Vehicle Micro Channel Evaporator

摘要:

通过蒸发器制冷能力、通风阻力、蒸发器内阻一维仿真结果与试验值比较，发现制冷剂侧两相换热区、过热区、空气侧分别采用已有的换热关联式计算时，计算值与试验值吻合度较好，误差控制在5%以内.研究了百叶窗翅片的百叶窗开角、翅片间距、翅片高度以及扁管的通道宽度、通道数对蒸发器性能的影响.对蒸发器进行了结构优化，选取了一个综合性能最优的方案，使得通风阻力下降19%，蒸发器内阻下降8.4%，制冷能力提高130 W.

Abstract:

By comparing the one dimensional simulation results of the evaporator refrigeration capacity, ventilation resistance and evaporator internal resistance with the experimental values, it is found that the KewCornwell heat exchange correlation in the two phase heat exchange zone of the refrigerant side, the DitusBoeleter heat transfer correlation in the superheated area, and the Dong Junqi model in the air side are appropriate. The error is controlled within 5%. The influence of the opening angle of blinds, the spacing of fins and the height of fins, the width of the tube, the number of channels and the number of flat tubes in each process of evaporator on the performance of the evaporator are studied. According to the above analysis, the structure of the evaporator is optimized. Finally, a scheme with the best comprehensive performance is selected, which makes the ventilation resistance drop by 19%, the internal resistance of the evaporator drop by 8.4%, and the refrigeration capacity is increased by 130 W.