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Thermal analysis and optimization of a system for water harvesting from humid air using thermoelectric coolers

机译：使用热电冷却器对潮湿空气中的水进行收集的系统的热分析和优化

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摘要

Condensation of water vapor available in atmospheric air can be considered as a solution for water scarcity problem. In this paper, a comprehensive thermodynamic analysis of water production from humid air using thermoelectric coolers (TECs) is presented. The system consists of a number of thermoelectric coolers, a fan to supply the required air flow circulation, two cold and hot air channels, heat sinks and solar cells for powering the thermoelectric coolers and fan. Effects of various design parameters are investigated and discussed. The proposed design is optimized to get the maximum effectiveness which is defined as the amount of produced water per unit of energy consumption. Sensitivity analysis is used to find the optimum number of TECs, length of the channels and performance of the system at different temperatures. The resulting system is capable of producing 26 ml of water within 1 h from the air with 75% relative humidity and the temperature of 318 K by consuming only 20 W of electrical power. In addition, the annual performance and optimization of this device in three southern cities of Iran are presented based on hourly meteorological data. Finally, comparison of the present system with other air water generators indicates that the proposed design is the most energy efficient system among similar devices especially in high relative humidity.
机译：大气中可用的水蒸气的冷凝可被视为解决水资源短缺问题的一种方法。本文介绍了使用热电冷却器（TEC）对潮湿空气中的水分生产进行的综合热力学分析。该系统包括多个热电冷却器，提供所需空气流通的风扇，两个冷热通道，散热器和太阳能电池，为热电冷却器和风扇提供动力。研究和讨论了各种设计参数的影响。对提出的设计进行了优化，以获得最大的效率，该效率定义为每单位能耗的产出水量。灵敏度分析用于找到最佳的TEC数量，通道长度以及在不同温度下系统的性能。所产生的系统仅消耗20 W的电能就能在空气中1 h内以相对湿度75％和318 K的温度产生26 ml的水。此外，根据每小时气象数据，还介绍了伊朗三个南部城市中该设备的年度性能和优化情况。最后，本系统与其他空气水发生器的比较表明，所提出的设计是同类设备中最节能的系统，尤其是在相对湿度较高的情况下。

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