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首页> 外文期刊>Building and Environment >Performance analysis of a novel liquid desiccant evaporative cooling fresh air conditioning system with solution recirculation
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Performance analysis of a novel liquid desiccant evaporative cooling fresh air conditioning system with solution recirculation

机译：溶液再循环的新型液体干燥剂蒸发冷却新风系统性能分析

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摘要

Liquid desiccant evaporative cooling air-conditioning (LDECAC) system, which combines both advantages of liquid desiccant and evaporative cooling technology, has a great potential to utilize low-grade heat for refrigeration and air conditioning. A novel LDECAC system is proposed to obtain lower supply air temperature and humidity ratio at the expense of less thermal energy consumption when used as a dedicated fresh air system. It consists of a liquid desiccant system with self-cycle solution at dehumidification and regeneration sides, a regenerative indirect evaporative cooler (RIDEC) and a direct evaporative cooler with adjustable by-pass flow. A parametric study on steady-state thermal performance of LDECAC system was performed based on the developed mathematical model. The performance was investigated by varying five key parameters: solution self-cycle ratio (R-s), working to intake air flow ratio (R-a), regeneration temperature, ambient air temperature and humidity ratio. The results show that the system can handle the process air to 17.9 degrees C and 9.2 g/kg with the thermal coefficient of performance of 0.56 under the design condition. The recommended value for R-s lies between 0.6 and 0.7 and that for R-a is 0.2 under the typical operating condition. The variable Rs control method is effective in response to the change of ambient air conditions. Performance comparison with the conventional LDECAC system shows that the novel system can utilize lower temperature heat source and achieve a higher thermal coefficient of performance. (C) 2017 Elsevier Ltd. All rights reserved.
机译：液体干燥剂蒸发冷却空调（LDECAC）系统结合了液体干燥剂和蒸发冷却技术的优点，具有利用低级热量进行制冷和空调的巨大潜力。提出了一种新颖的LDECAC系统，以用作专用的新鲜空气系统时，以较低的热能消耗为代价获得较低的送风温度和湿度比。它由在干燥和再生侧具有自循环溶液的液体干燥剂系统，再生式间接蒸发冷却器（RIDEC）和可调节旁路流量的直接蒸发冷却器组成。基于已开发的数学模型，对LDECAC系统的稳态热性能进行了参数研究。通过改变五个关键参数来研究性能：溶液自循环比（R-s），工作与进气流量比（R-a），再生温度，环境空气温度和湿度比。结果表明，该系统在设计条件下可以处理17.9摄氏度和9.2 g / kg的过程空气，热性能系数为0.56。在典型工作条件下，R-s的推荐值介于0.6和0.7之间，R-a的推荐值为0.2。可变的Rs控制方法对于响应周围空气条件的变化是有效的。与常规LDECAC系统的性能比较表明，该新型系统可以利用较低温度的热源并获得较高的性能热系数。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Building and Environment》 |2017年第5期|218-229|共12页
  • 作者

    Zhang Fan; Yin Yonggao; Zhang Xiaosong;

  • 作者单位

    Southeast Univ, Sch Energy & Environm, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Nanjing 210096, Jiangsu, Peoples R China|Southeast Univ, Jiangsu Prov Key Lab Solar Energy Sci & Technol, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Nanjing 210096, Jiangsu, Peoples R China|Southeast Univ, Jiangsu Prov Key Lab Solar Energy Sci & Technol, Nanjing 210096, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dehumidification; Evaporative cooling; Liquid desiccant; Recirculation; Air conditioning;

    机译：除湿;蒸发冷却;液体干燥剂;再循环;空调;

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