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基于EES软件,利用分布参数法建立蒸发冷凝器仿真计算模型,并实验验证模型的准确性,选取R236fa为工质,计算分析不同管长、管径、微肋等结构参数变化对蒸发冷凝器换热性能的影响。研究表明:蒸发冷凝器的结构参数对其换热性能影响较大,在文中的研究工况下,长度为7~9m,内管外径为9~11mm,外管内径为30~36mm时,蒸发冷凝器换热效果最优。另外,微肋管的齿高、螺旋角、齿顶角变化也会影响蒸发冷凝器的换热性能,换热量随着肋高和螺旋角的增大而增大,随着齿顶角的增大而减小,本研究可为下一步蒸发冷凝器的优化设计提供参考和理论依据。
Based on the EES software, the evaporating condenser simulation calculation model was established by the distributed parameter method. The model was verified experimentally by using R236fa as working fluid. The influence of structural parameters such as tube length, tube diameter, Effect of thermal properties. The results show that the structural parameters of the evaporative condenser have a great influence on the heat transfer performance. When the length of the condenser is 7 ~ 9m, the diameter of the inner tube is 9 ~ 11mm and the diameter of the outer tube is 30 ~ 36mm, Evaporative condenser heat exchanger best. In addition, the micro-fin tube tooth height, helix angle, crest angle change will also affect the heat transfer performance of the evaporative condenser heat transfer increases with the rib height and helix angle increases, with the addendum angle Increase and decrease, this study can provide reference and theoretical basis for the optimal design of the evaporative condenser in the next step.