【摘要】 采用分布参数法建立水平管降膜蒸发器管束换热模型,模拟计算了水平管降膜蒸发器不同管程布置下换热管干斑分布和平均降膜因子,并进行比较分析;并在下进上出的管程布置形式下研究了制冷剂流量、管间距、满液区排管数对蒸发器换热性能的影响。本文的研究为水平管降膜蒸发器的设计提供理论指导,促进其在制冷空调领域的推广应用。更多还原

【Abstract】 A theoretical thermodynamic model with distributed parameters was developed for simulating the falling film heat transfer performance,and in this model the effect of film breakdown( or dry patch) is considered. In this simulation,the distribution of dry patch,average falling film factor is obtained,and the effect of the tube bundle layout,refrigerant mass flow rate,tube pitch,the flooded tube row amount is also analyzed. This study is a contribution for the design of horizontal falling film evaporators and promote their application in the field of refrigeration and air conditioning.更多还原