Abstract Humidification dehumidification (HDH) systems are robust and known to withstand a wide range of saline water without the need of complex maintenance. In this study, the closed-air open-water (CAOW) HDH arrangement is examined, which can easily be integrated with solar or other renewable resources. Also, this system is modified by incorporating heat recovery options for low performing units. The heat recovery process is executed through two approaches, (i) a mixing chamber and, (ii) by a heat exchanger. Thermal balancing through air extraction is evaluated for the basic as well as the modified cycles, particularly for high performing units. Zero, single and double extractions models are evaluated for the conventional CAOW water heated cycle. The performance of the systems is characterized into three operating regions (high, moderate and low) based on the effectiveness of the components. Based on the results of this evaluation, an operating scheme is then developed to decide where to use the conventional or the modified systems with or without extraction.

中文翻译：

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常规和改进的闭气开放式加湿除湿系统的设计策略

摘要 加湿除湿 (HDH) 系统坚固耐用，可以承受各种盐水，无需复杂的维护。在这项研究中，研究了封闭空气开放水域 (CAOW) HDH 布置，它可以很容易地与太阳能或其他可再生资源相结合。此外，该系统还通过为低性能单元加入热回收选项进行了修改。热回收过程通过两种方法执行，(i) 混合室和，(ii) 通过热交换器。通过抽气进行的热平衡针对基本循环和改进循环进行评估，特别是对于高性能装置。针对传统 CAOW 水加热循环评估零、单和双提取模型。系统的性能分为三个运行区域（高、中等和低）基于组件的有效性。根据该评估的结果，然后制定操作方案，以决定在何处使用传统或改进的系统，有或没有提取。