Solar humidification–dehumidification desalination system based on hollow fiber membrane is a promising method to produce drinkable water from brine due to its abilities for low primary energy consumption and pollution prevention for the liquid seawater droplets. As operating conditions change with temporal weather conditions, a dynamic model of this desalination system is developed and experimentally validated in this study. Transient performance is investigated and a regulation strategy is proposed. It is found that the startup time can be reduced substantially by decreasing the mean pore diameter, porosity of the membrane, solar collector area, and volume of the seawater in the storage tank, and increasing the packing fractions of the humidifier. The specific freshwater production (SWP) rate at the equilibrium state grows with longer mean pore diameter, higher porosity of the membrane, more solar collector areas, and less packing fractions of the humidifier. SWP is basically constant with different volumes of the seawater in the storage tank. Variations of solar radiation cause the low freshwater production and high energy consumption especially in the morning and afternoon. Utilizing our model, the hour-by-hour adjustment is also established. The accumulated water production in 1 day can be increased by 13.5% and the energy consumption can decrease by over 23% based on decreasing flow rates of the seawater in the morning and increasing flow rates of the cooling water in the afternoon. The proposed dynamic model will be helpful for the daily regulation of the seawater desalination system and a better performance can be realized.

中文翻译：

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基于中空纤维膜的太阳能加湿除盐系统的瞬态性能

基于中空纤维膜的太阳能加湿除湿系统由于具有低一次能源消耗和防止液态海水滴落的能力，因此是一种从盐水中生产饮用水的有前途的方法。由于运行条件随时间天气条件而变化，因此开发了该淡化系统的动态模型，并在本研究中进行了实验验证。研究了瞬态性能并提出了一种调节策略。已经发现，通过减小平均孔径，膜的孔隙率，太阳能收集器的面积以及储罐中海水的体积，并增加加湿器的填充率，可以大大减少启动时间。平衡状态下的特定淡水生产（SWP）速率随着平均孔径越长，膜的孔隙率越高，太阳能收集器面积越大，加湿器的填充分数越少而增加。对于储罐中不同体积的海水，SWP基本上是恒定的。太阳辐射的变化导致淡水产量低和能源消耗高，尤其是在早晨和下午。利用我们的模型，还可以建立每小时调整。根据早晨海水流量的减少和下午冷却水流量的增加，一天中的累积水产量可以增加13.5％，能耗可以减少23％以上。