• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (16): 156-161.doi: 10.3901/JME.2016.16.156

• 可再生能源与工程热物理 • 上一篇    下一篇

考虑制冷剂两相分配不均的微通道蒸发器压降模型

黄翔超1,2   

  1. 1. 特灵空调系统(中国)有限公司博士后工作站 上海 200051;
    2. 上海交通大学动力工程及工程热物理博士后流动站 上海 200240
  • 出版日期:2016-08-20 发布日期:2016-08-20
  • 作者简介:

    黄翔超,男,1981年出生,博士。主要研究方向为制冷空调系统仿真,换热器设计及优化等。

    E-mail:xiangchao.huang@trane.com

Microchannel Evaporator Pressure Drop Model with Considering Refrigerant Maldistribution

HUANG Xiangchao1,2   

  1. 1. Trane Air Conditioning Systems (China) Co,.Ltd. Postdoctoral Work Station, Shanghai 200051;
    2. Power Engineering and Engineering Thermo-physics Postdoctoral Research Station, Shanghai Jiao Tong University, Shanghai 200240
  • Online:2016-08-20 Published:2016-08-20

摘要:

制冷剂两相分配不均是影响微通道蒸发器压降特性的重要因素,为了准确预测制冷剂两相分配不均影响下的微通道蒸发器压降,开发了新的微通道蒸发器压降模型。模型考虑了从微通道蒸发器进口管到出口管的所有局部和沿程压力损失,引入了简化的微通道管进口干度分布函数来计算微通道蒸发器内各微通道单管的进口状态,提出一种考虑制冷剂两相分配不均的流路压降平衡的仿真算法来迭代求解出微通道蒸发器的压降。该模型适用于制冷剂在蒸发器进口为两相状态(进口干度小于0.45),制冷剂在集流管内质流密度小于764 kg/m2s的条件。模型的仿真结果能较好符合制冷剂在微通道蒸发器中的流量和温度分布趋势,并且与微通道蒸发器压降的试验数据误差小于8%。

关键词: 仿真模型, 两相分配, 压降, 微通道蒸发器

Abstract:

Refrigerant maldistribution is an important factor to influence pressure drop characteristic of microchannel evaporator, so a new pressure drop model of microchannel evaporator is proposed for accurately predicting the pressure drop influenced by refrigerant maldistribution. This model considers all the local and frictional pressure losses from the inlet to outlet of microchannel evaporator, imports simplified quality distribution function to calculate the inlet state of each microchannel tube, and presents a flow path pressure drop balance algorithm to iterate microchannel evaporator pressure drop. This model can be applied to the condition that evaporator inlet is two-phase condition (inlet quality is less than 0.45) and refrigerant mass flux inside inlet header is less than 764 kg/m2s. It is shown that the model results can meet the real condition of flow rate and temperature distribution trend of refrigerant inside microchannel evaporator, and the deviation with evaporator pressure drop test data is less than 8%.

Key words: pressure drop, simulation model, two phase distribution, microchannel evaporator