基于GO/PI/PTFE复合薄膜的热空气吹掠型太阳能界面蒸发效率实验研究

EXPERIMENTAL STUDY ON EVAPORATION EFFICIENCY OF HOT AIR BLOWING TYPE SOLAR INTERFACE USING GO/PI/PTFE COMPOSITE FILMS

为了提高太阳能界面蒸发的蒸发效率,从改变结构设计和光热材料两个方面出发,设计了一种热空气吹掠型太阳能界面蒸发装置。该蒸发装置利用平板型太阳能空气集热器产生的高温空气吹过蒸发表面,加速界面蒸发;同时利用氧化石墨烯的性能优势,制备了氧化石墨烯/聚酰亚胺/聚四氟乙烯膜(GO/PI/PTFE)复合薄膜作为光热材料,以提高装置蒸发效率。最后通过实验对该蒸发装置的性能进行分析验证。研究结果表明:制备得到的GO/PI/PTFE复合薄膜具有更强的光吸收能力,且亲水性能更佳。在蒸发表面吹入速度为4 m/s、温度为65℃的热空气,太阳辐照度为1000 W/m^(2)的条件下,在1800 s时,采用GO/PI/PTFE复合薄膜但无热风吹掠的蒸发装置对应的蒸发速率为1.22 kg/(m^(2)·h),与纯水蒸发装置相比,蒸发速率提高了3.2倍,蒸发效率提高了59.5%;热空气吹掠型太阳能界面蒸发装置的蒸发效率为88.0%,高于纯水蒸发装置和无热空气吹掠的蒸发装置,与纯水蒸发装置相比,其蒸发速率提高了5.5倍,蒸发效率提高了68.0%。热空气吹掠可以提高蒸发量,进而提高蒸发装置的蒸发效率。研究结果可为后续提高热空气吹掠型太阳能界面蒸发装置蒸发效率的研究提供理论依据和实验基础。

In order to improve the evaporation efficiency of solar interface evaporation,this paper designs a hot air blowing solar interface evaporation device from two aspects:changing the structural design and photothermal materials.The evaporation device utilizes high-temperature air generated by a flat panel solar air collector to blow over the evaporation surface and accelerate interfacial evaporation.Meanwhile,utilizing the performance advantages of graphene oxide,a composite film of GO/PI/PTFE is prepared as a photothermal material to improve evaporation efficiency of device.Finally,the performance of the evaporation device is analyzed and verified through experiments.The research results show that the prepared GO/PI/PTFE composite film has stronger light absorption ability and better hydrophilicity.Under the conditions of blowing hot air with a speed of 4 m/s and a temperature of 65℃into the evaporation surface,and a solar irradiance of 1000 W/m^(2),at 1800 s,the evaporation rate corresponding to the evaporation device with GO/PI/PTFE composite film but without hot air blowing is 1.22 kg/(m^(2)•h).Compared with the pure water evaporation device,the evaporation rate is increased by 3.2 times and the evaporation efficiency is improved by 59.5%.The evaporation efficiency of the hot air blowing solar interface evaporation device is 88%,which is higher than that of pure water evaporation devices and non hot air blowing evaporation devices.Compared with pure water evaporation devices,the evaporation rate is increased by 5.5 times and the evaporation efficiency is improved by 68.0%.Hot air blowing can increase the evaporation capacity,thereby improving the evaporation efficiency of the evaporation device.The research results can provide theoretical and experimental basis for further research on improving the evaporation efficiency of hot air blowing solar interface evaporation devices.