Identification of Stressors Leading to Degradation of Antisoiling Coating in Warm and Humid Climate Zones
Identification of Stressors Leading to Degradation of Antisoiling Coating in Warm and Humid Climate Zones
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导致温暖和潮湿气候区防污涂层降解的应力源的识别
DOI：
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发表时间：
2020
影响因子：
3
通讯作者：
A. Kottantharayil
中科院分区：
文献类型：
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作者：
Sonali Bhaduri;Ajeesh Alath;S. Mallick;N. Shiradkar;A. Kottantharayil
我们通过实验确定了在暴露于孟买天气条件下降解疏水（接触角> 90°）防污涂层的显著应力源，其中由于灰尘沉积的损失在三个月内高达50%。在12周的现场暴露中，防污涂层的接触角由疏水性变为亲水性（接触角< 90°）。通过测试光伏（PV）模块上性能最差的涂层，全年在涂覆的PV模块上没有观察到灰尘沉积率的显著降低。在每次清洁运行后，涂覆的模块的污染损失回到零（未在未涂覆的模块中观察到），这表明涂覆的模块易于清洁。这导致比未涂覆的每周清洁模块低2.2%的污染损失。这种趋势在四个月的强降雨后发生逆转，此后，未涂覆的模块显示出比涂覆的模块更低的污染损失。通过现场暴露试验确定的应激源的特征是：1）在下雨期间频繁的自然清洁导致涂层表面上的显著磨损，并且降雨的酸性组分与涂层反应（这通过室内个体应力试验验证），以及2）频繁的手动清洁运行，这导致灰尘和水的磨损（通过室内个体应力试验验证）。频繁清理对田地的影响更为严重，因为在真实的田地条件下，压力源的组合同时起作用。还通过室内应力测试研究了UV暴露和冷凝的影响，其中UV暴露和冷凝的组合显示接触角（对于所有涂层）在统计学上显著降低。涂层C的接触角降低速率最高，使其在32 kWh/m2的UV剂量和441小时的冷凝后完全亲水。然而，在室内压力测试中，单独的压力源（紫外线照射和水浸），非常高的压力水平需要产生类似程度的降解。
We experimentally identified significant stressors that degrade the hydrophobic (contact angle > 90°) antisoiling coatings on exposure to Mumbai weather conditions, where losses due to dust deposition go up to 50% in three months. The contact angle of the antisoiling coatings changed from hydrophobic to hydrophilic (contact angle < 90°) in 12 weeks of field exposure. By testing the weakest performing coating on photovoltaic (PV) modules, no significant reduction of rate of dust deposition was observed on the coated PV module throughout the year. Soiling loss of the coated module went back to zero after every cleaning run (not seen in the uncoated module), which signifies ease of cleaning in the coated module. This resulted in a 2.2% lower soiling loss than the uncoated weekly cleaned module. This trend was reversed after four months of heavy rainfall, after which the uncoated module shows lower soiling loss than the coated module. Signatures of stressors identified by the field exposure test were: 1) rainfall—frequent natural cleaning during rain caused significant abrasion on the coated surface, and the acidic component of the rainfall reacted with the coating (which was verified by the indoor individual stress test), and 2) frequent manual cleaning runs, which lead to abrasion by dust and water (verified by the indoor individual stress test). The effect of frequent cleaning on the field was more severe, as, in real field condition, the combination of stressors acted concurrently. The effect of UV exposure and condensation was also studied by the indoor stress test, where the combination of UV exposure and condensation showed a statistically significant decrease in the contact angle (for all coatings). The rate of decrease in the contact angle was the highest for coating C, making it completely hydrophilic after 32 kWh/m2 of UV dose and 441 h of condensation. However, in indoor stress tests with individual stressors (UV exposure and water immersion), very high stress levels are required for producing a similar extent of degradation.
光伏组件玻璃盖板防污涂层的测试
DOI：
10.1109/pvsc.2018.8547272
发表时间：
2018
期刊：
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影响因子：
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作者：
Isbilir K
通讯作者：
Isbilir K