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首页> 外文期刊>International Journal of Heat and Mass Transfer >Influence of plate surface temperature on the wetted area and system performance for falling film liquid desiccant regeneration system
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Influence of plate surface temperature on the wetted area and system performance for falling film liquid desiccant regeneration system

机译：板面温度对降膜液体干燥剂再生系统湿润面积和系统性能的影响

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摘要

The falling film liquid desiccant air conditioning system is a promising technology. The wetted area, as a key factor affecting the system performance, is significantly influenced by the plate surface temperature. With a single channel internally heated regenerator, this paper experimentally investigated the impact of plate temperature on the wetted area and system performance, by obtaining the film area and temperature with a thermal camera. LiCl was chosen as the desiccant. By reducing the film contraction in the transverse direction, the increase of plate surface temperature could enhance the wetted area significantly, especially for the low solution mass flow rate. The growth rate of area increased from 0.0017 to 0.0022 m2/℃ when the flow rate reduced from 0.062 to 0.034 kg/s. The regeneration performance also increased with the temperature. A theoretical model with an analytical solution was developed to obtain the wetted area by describing the film contraction caused by the Marangoni effect. A good match was observed for the prediction and experimental results, with an average error of 10.8%. Furthermore, the wetted width was numerically found to also increase with the decrease of film thickness and contact angle, and its change with the solution concentration was slight. This research helps researchers and engineers to accurately predict the wetted area of falling film and to improve the heat and mass transfer performance of liquid desiccant regeneration system.
机译：降膜式液体干燥剂空调系统是一项很有前途的技术。润湿面积是影响系统性能的关键因素，其显着影响板表面温度。使用单通道内部加热的蓄热室，本文通过使用热像仪获得膜面积和温度，实验研究了印版温度对润湿面积和系统性能的影响。选择LiCl作为干燥剂。通过减小薄膜在横向上的收缩，板表面温度的升高可以显着增加润湿面积，特别是对于低溶液质量流量。当流量从0.062 kg / s降低到0.034 kg / s时，面积的增长速率从0.0017增加到0.0022 m2 /℃。再生性能也随温度而提高。通过描述由Marangoni效应引起的薄膜收缩，开发了带有解析溶液的理论模型来获得润湿区域。观察到的预测和实验结果很好的匹配，平均误差为10.8％。此外，在数值上发现润湿宽度也随着膜厚度和接触角的减小而增加，并且其随溶液浓度的变化很小。这项研究可帮助研究人员和工程师准确预测降膜的湿润面积，并改善液体干燥剂再生系统的传热和传质性能。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2013年第9期|1003-1013|共11页
  • 作者

    Ronghui Qi; Lin Lu; Hongxing Yang; Fei Qin;

  • 作者单位

    Renewable Energy Research Croup (RERC), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong;

    Renewable Energy Research Croup (RERC), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong;

    Renewable Energy Research Croup (RERC), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong;

    Renewable Energy Research Croup (RERC), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong,Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China,Graduate University of Chinese Academy of Sciences. Beijing 100190, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Falling film; Liquid desiccant regeneration; Wetted area; Plate surface temperature; Experiment; Theoretical model;

    机译：落膜;液体干燥剂再生;潮湿区域;板面温度;实验;理论模型;

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