上海交通大学学报

上海交通大学学报（自然版）

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水平管降膜蒸发器的管束列数优化数值模拟

杨丽1，王文1，白云飞2   

  1. (1. 上海交通大学 机械与动力工程学院， 上海 200240；2. 烟台荏原空调设备有限公司， 山东 烟台 265500)
  • 收稿日期:2009-04-24 修回日期:1900-01-01 出版日期:2010-01-29 发布日期:2010-01-29

Column Arrangement Optimization on Horizontal Tube Bundles of Falling Film Evaporators

YANG Li1,WANG Wen1,BAI Yunfei2   

  1. (1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Yantai Ebara Air Conditioning Equipment Company, Yantai 265500, Shangdong, China)
  • Received:2009-04-24 Revised:1900-01-01 Online:2010-01-29 Published:2010-01-29

摘要： 基于分布参数方法，对大型制冷系统中水平管降膜蒸发器的换热特性进行管束列数优化数值模拟，计算了饱和液态制冷剂HFC134a在水平铜管束外的流动蒸发换热特性，并考虑不同降膜管束列数和蒸发器中的满液管排数对蒸发器换热特性的影响，提出采用质流场均匀性因子来评价降膜蒸发器的换热性能.结果表明：在满液管排数一定的情况下，降膜蒸发器的管束布置列数越少，则降膜传热管外干斑面积越小；质流场均匀性因子越大，蒸发器换热特性越好.

关键词: 降膜, 蒸发, 管束, 数值模拟

Abstract: An analysis about optimizing the column arrangement of horizontal tube bundles in falling film evaporators was carried out with numerical simulation by distributed parameters in large compression refrigeration systems. In this simulation, the model considered the evaporation heat transfer performance on horizontal copper tube bundles with liquid refrigerant HFC134a. The impacts of some factors, such as the column number of falling film tube bundle and the number of flooded tube row on the evaporator performance were analyzed. In addition, a parameter of uniformity factor of mass flow field was set up to evaluate the heat transfer performance of evaporators. The results indicate that the less the column number of the falling film tube bundle is arranged, the less the dry patches on falling film tube surfaces, the greater the uniformity factor of mass flow field and the better the heat transfer performance of evaporators under the same flooded tube rows.