The present study proposes a new type of sorber bed, a stationary thin film microgroove-based absorber for oscillatory waste-heat-driven sorption heat transformers, which operate on a temperature swing sorption process. Although this study focuses on sorption heat transformers, the present sorber bed can be used for other temperature swing sorption applications such as carbon capture, atmospheric water harvesting, and desalination. As a proof of concept for this idea, a microgrooved aluminum substrate is fabricated. The substrate is coated with AlO/TiO layers using plasma enhanced atomic layer deposition and magnetron sputtering physical vapor deposition to enhance wetting and confine the solution within the microgrooves. Contact angle and capillary rise measurements are performed for three different salts: LiBr, LiCl, and CaCl, demonstrating the microgrooves’ wettability. A custom-built gravimetric large pressure jump setup is used to experimentally measure the water uptake of the sorbent. It is shown that a specific cooling power of up to seven times that of experimental data available in the literature can be obtained. The effect of crystallization on the sorption dynamic for the three mentioned salts is also investigated. It is shown that the present sorber bed demonstrates the capability to handle crystallization.

中文翻译：

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用于吸附热转换器的固定薄膜微槽吸附反应器：表面改性、吸附动力学和结晶


本研究提出了一种新型吸收器床，这是一种基于固定薄膜微槽的吸收器，用于振荡废热驱动的吸附热转换器，其在变温吸附过程中运行。尽管本研究重点关注吸附热转换器，但目前的吸附床可用于其他变温吸附应用，例如碳捕获、大气水收集和海水淡化。作为这一想法的概念证明，我们制造了微槽铝基板。使用等离子体增强原子层沉积和磁控溅射物理气相沉积在基板上涂覆 Al2O/TiO 层，以增强润湿并将溶液限制在微槽内。对三种不同的盐进行接触角和毛细管上升测量：LiBr、LiCl 和 CaCl，证明了微槽的润湿性。定制的重力大压力跳跃装置用于实验测量吸附剂的吸水量。结果表明，可以获得高达文献中实验数据七倍的比冷却功率。还研究了结晶对上述三种盐的吸附动力学的影响。结果表明，本吸附床具有处理结晶的能力。