Passive freezing desalination driven by radiative cooling
Passive freezing desalination driven by radiative cooling
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DOI：
10.1016/j.joule.2022.10.009
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发表时间：
2022-11
期刊：
影响因子：
39.8
通讯作者：
Xin Huang;Jyotirmoy Mandal;Jin Xu;A. Raman
中科院分区：
文献类型：
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作者：
Xin Huang;Jyotirmoy Mandal;Jin Xu;A. Raman
面对气候变化，水资源日益稀缺，这引发了人们对寻找低碳强度的方法从盐碱地生产淡水的浓厚兴趣。传统的膜和热海水淡化技术需要大量的能源投入，随着盐度的增加，这可能会变得令人望而却步。或者，太阳能海水淡化是一种发展良好的被动蒸发方法，但在季节和地理上受到太阳辐射的限制。在这里，我们提出并演示了一种被动的方法来实现一种更具热力学吸引力的相变，这种相变也可以实现海水淡化：冻结。我们开发了一种系统，它使用被动辐射冷却到最终的热沉，外层空间，冻结和淡化咸水。实验证明，经过两个辐射制冷冷冻淡化阶段后，被动式海水淡化从37.3g/L盐水降至1.88g/L，回收率为50%；17.5g/L盐水，被动海水淡化至0.7g/L，回收率为65%。我们的结果突出了利用未开发的热力资源用于水技术的潜力。
Increasing water scarcity in the face of climate change has driven significant interest in finding low-carbon-intensity ways of generating fresh water from saline sources. Conventional membrane and thermal desalination techniques require large energy inputs that can become prohibitive as salinity increases. Alternatively, solar desalination is a well-developed passive evaporative approach but is limited seasonally and geographically by solar insolation. Here, we propose and demonstrate a passive approach to a more thermodynamically attractive phase change that can also enable desalination: freezing. We develop a system that uses passive radiative cooling to the ultimate heat sink, outer space, to freeze and desalinate salt water. We experimentally demonstrate the passive desalination of 37.3 g/L salt water to 1.88 g/L after two radiative cooling-driven freezing desalination stages with 50% recovery and 17.5 g/L salt water to 0.7 g/L with 65% recovery. Our results highlight the potential of harnessing untapped thermodynamic resources for water technologies.