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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysing the transport phenomena of novel dew-point evaporative coolers with different flow configurations considering condensation
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Analysing the transport phenomena of novel dew-point evaporative coolers with different flow configurations considering condensation

机译：考虑凝结的不同流动配置分析新型露点蒸发冷却器的运输现象

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摘要

This paper entails a study on the transport phenomena of a novel dew-point evaporative cooler with counter-flow closed-loop configuration, a potential alternative to the conventional mechanical vapor compression system. In contrast to the conventional indirect evaporative cooler and the regenerative indirect evaporative cooler, the proposed novel dew-point evaporative cooler is capable of achieving the simultaneous goals of pre-cooling, energy recovery and dehumidification. The novel dew-point evaporative cooler is classified as either type 1 or type 2 based on the relative flow direction between the water and the supply air. A two-dimensional computational fluid dynamics model is judiciously developed and employed to conduct a comparative study which evaluates the performance of the conventional indirect evaporative cooler vis-a-vis both novel type 1 and novel type 2 configurations. Experimental data is then employed to validate the predictive accuracy of the mathematical model. The distributions of both temperature and humidity ratio are plotted for a typical case of the novel cooler incorporating both flow configurations and considering the effects of moisture condensation. Additionally, the impacts made by key parameters on the cooling performance under condensation state are analyzed by using three evaluation indexes, namely, latent efficiency, wet-bulb efficiency, and enlargement coefficient. By regulating several operating parameters, the variations of the three evaluation indexes are plotted via the proposed numerical model. Key results from this study revealed that the novel type 1 flow configuration is capable of achieving the highest latent and wet-bulb efficiencies, and enlargement coefficient. It is also observed that the relative flow direction between the water and the supply air exerts a stronger influence on the cooler performance compared to the changes of the water mass flow rate.
机译：本文需要研究新型露点蒸发冷却器的新型露点蒸发冷却器的运输现象，其具有传统机械蒸汽压缩系统的潜在替代方案。与传统的间接蒸发冷却器和再生间接蒸发冷却器相反，所提出的新型露点蒸发冷却器能够实现预冷却，能量回收和除湿的同时进球。基于水和供应空气之间的相对流动方向，新型露点蒸发冷却器被归类为1型或型2。二维计算流体动力学模型明智地开发并用于进行比较研究，该研究评估常规间接蒸发冷却器Vis-Vis的性能，包括两种新型1和新型2型配置。然后采用实验数据来验证数学模型的预测精度。绘制温度和湿度比的分布对于包含流量配置的新型冷却器的典型情况并考虑水分凝结的影响。另外，通过使用三种评估指标，即潜伏的效率，湿灯泡效率和放大系数来分析由缩合状态下的缩合状态下的缩小性能下的关键参数对冷却状态的影响。通过调节若干操作参数，通过所提出的数值模型绘制三个评估指标的变化。本研究的关键结果显示，新型1型流动配置能够实现最高的潜伏和潮湿的效率和扩大系数。还观察到，与水质量流速的变化相比，水和供应空气之间的相对流动对冷却器性能的影响力较强。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|120991.1-120991.17|共17页
  • 作者

    Yangda Wan; Zhifeng Huang; Alexander Son; Xin Cui; Kian Jon Chua;

  • 作者单位

    Department of Mechanical Engineering National University of Singapore. 9 Engineering Drive I Singapore 117575 Singapore;

    Department of Mechanical Engineering National University of Singapore. 9 Engineering Drive I Singapore 117575 Singapore;

    Department of Mechanical Engineering National University of Singapore. 9 Engineering Drive I Singapore 117575 Singapore;

    Institute of Building Environment and Sustainable Technology School of Human Settlements and Civil Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China;

    Department of Mechanical Engineering National University of Singapore. 9 Engineering Drive I Singapore 117575 Singapore;

  • 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

    Novel dew-point evaporative cooler; Counter-flow; Cooling performance; Condensation;

    机译：新型露点蒸发冷却器;反流;冷却性能;缩合;

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