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Design of Flat-Plate Dehumidifiers for Humidification-Dehumidification Desalination Systems

机译：加湿除湿淡化系统平板除湿机的设计

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摘要

Flat-plate heat exchangers are examined for use as dehumidifiers in humidification-dehumidification (HDH) desalination systems. The temperature and humidity ratio differences that drive mass transfer are considerably higher than in air-conditioning systems, making current air-conditioning dehumidifier designs and design software ill-suited to HDH desalination applications. In this work a numerical dehumidifier model is developed and validated against experimental data. The model uses a logarithmic mass transfer driving force and an accurate Lewis number. The heat exchanger is subdivided into many cells for high accuracy. The Ackermann correction takes into account the effect of noncondensable gases on heat transfer during condensation. The influence of various heat exchanger design parameters is thoroughly investigated and suitable geometries are identified. Among others, the relationship between heat flow, pressure drop, and heat transfer area is shown. The thermal resistance of the condensate layer is negligible for the investigated geometries and operating point. A particle-embedded polymer as a flat-plate heat exchanger material for seawater operation substantially improves the heat flux relative to pure polymers and approaches the performance of titanium alloys. Thus, the use of particle-embedded polymers is recommended. The dehumidifier model can be applied in design and optimization of HDH desalination systems.
机译：已检查平板热交换器是否用作加湿-除湿（HDH）脱盐系统中的除湿器。驱动传质的温度和湿度之比大大高于空调系统，这使得当前的空调除湿机设计和设计软件不适合HDH脱盐应用。在这项工作中，开发了一个数字除湿器模型，并根据实验数据进行了验证。该模型使用对数传质驱动力和精确的Lewis数。换热器可细分为多个单元以实现高精度。阿克曼校正考虑了冷凝过程中不可冷凝气体对传热的影响。彻底研究了各种热交换器设计参数的影响，并确定了合适的几何形状。其中，示出了热流，压降和传热面积之间的关系。对于所研究的几何形状和工作点，冷凝层的热阻可以忽略不计。嵌入颗粒的聚合物作为用于海水操作的平板式换热器材料，相对于纯聚合物，其热通量显着提高，并接近钛合金的性能。因此，建议使用颗粒嵌入的聚合物。该除湿器模型可应用于HDH脱盐系统的设计和优化。

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  • 来源
    《Heat Transfer Engineering》 |2013年第9期|543-561|共19页
  • 作者

    MARTIN SIEVERS; JOHN H. LIENHARD V;

  • 作者单位

    Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA;

    Address correspondence to Professor John H. Lienhard V, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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