Abstract Solar steam generation has become the most promising solar-thermal applications in recent years. Scientists often focus on the search for superior materials, efficient structures, while ignoring the use of residual heat from the water at the bottom. In this paper, a membrane distillation system that utilizes residual heat was added in a new solar house of a domestic hot water and drinking water supply system in the first place. The pDA-rGO-PTFE membrane as an excellent evaporator was characterized in solar steam generation system, which possesses good hydrophilicity capacity and high intrinsic absorption properties. And at the optimal concentration of 20 mg/mL, the evaporation rate and efficiency of pDA-rGO-PTFE membrane could reach up 1.45 kg·m−2·h−1 and 93.8% respectively in one sun (one sun = 1kw·m−2). The PTFE membrane as a separator was applied in a membrane distillation system. Under average 0.66 sun in the natural environment, the average evaporation rate of a new solar house could reach about 1.10 kg·m−2·h−1, and there is an additional 0.71 kg·m−2·h−1 membrane permeation flux by the residual heat. In addition, the new solar house showed an excellent durability and desalination ability, the ions rejection rations of the collected condensate water were close to 99.8%. Hence, we conclude that further ideas of a new solar house were provided for solving water scarcity, domestic water consumption and the application of solar steam generation in the future.

中文翻译：

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利用余热促进蒸汽逸出的高效太阳能蒸汽发生系统

摘要 太阳能蒸汽发电已成为近年来最有前景的太阳能热应用。科学家们往往专注于寻找优质材料、高效结构，而忽略了利用底部水的余热。本文首先在生活热水和饮用水供应系统的新太阳房中增加了利用余热的膜蒸馏系统。pDA-rGO-PTFE膜作为一种优良的蒸发器，在太阳能蒸汽发生系统中具有良好的亲水性和较高的内在吸收性能。并且在20 mg/mL的最佳浓度下，pDA-rGO-PTFE膜的蒸发率和效率分别达到1.45 kg·m−2·h−1和93.8%，在一个太阳下（一个太阳= 1kw·m −2)。聚四氟乙烯膜作为隔膜应用于膜蒸馏系统。在自然环境中平均0.66日照下，新建太阳房的平均蒸发量可达1.10 kg·m−2·h−1左右，另外还有0.71 kg·m−2·h−1的膜渗透通量通过余热。此外，新型太阳能房屋还表现出优异的耐用性和脱盐能力，收集的冷凝水的离子截留率接近99.8%。因此，我们得出结论，为解决水资源短缺、生活用水和未来太阳能蒸汽发电的应用，提供了新的太阳能房屋的进一步想法。余热增加了 0.71 kg·m-2·h-1 膜渗透通量。此外，新型太阳能房屋还表现出优异的耐用性和脱盐能力，收集的冷凝水的离子截留率接近99.8%。因此，我们得出结论，为解决水资源短缺、生活用水和未来太阳能蒸汽发电的应用，提供了新的太阳能房屋的进一步想法。余热增加了 0.71 kg·m-2·h-1 膜渗透通量。此外，新型太阳能房屋还表现出优异的耐用性和脱盐能力，收集的冷凝水的离子截留率接近99.8%。因此，我们得出结论，为解决水资源短缺、生活用水和未来太阳能蒸汽发电的应用，提供了新的太阳能房屋的进一步想法。