Shu-Ngwa Asa’a , Giacomo Bizinoto Ferreira Bosco , Nikoleta Kyranaki , Arvid van der Heide , Hariharsudan Sivaramakrishnan Radhakrishnan , Jef Poortmans , Michael Daenen
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However, little to no work has been done to assess the light scattering properties of the existing PV module structural materials such as the glass, encapsulants and the transparent backsheet. This work therefore investigates the light scattering behaviour of c-Si PV module materials through haze and Hortiscatter measurements. 18 samples with the structural layout of glass/encapsulant/encapsulant/back cover (glass or transparent polymer backsheet), applying different commercial encapsulants, were manufactured and tested experimentally. Light in the photosynthetic spectrum was used in the optical characterization of the samples. Furthermore, the impact of UV degradation on the haziness was also tested and the uniformity of the light distribution was further assessed to obtain the Hortiscatter. The findings indicated that (i) Transparent backsheets increased the light diffusivity. (ii) UV degradation reduced the light scattering of most of the PV materials. (iii) For the haziest transparent backsheet sample, the distribution of the transmitted light increased with the incidence light angle and reduced with increasing wavelength in the visible spectrum (iv) Highest haze and Hortiscatter values of up to 80% and 84% respectively were obtained for a sample with glass/TPO/TPO/transparent backsheet layout. 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引用次数: 0
摘要
在农业光伏(AV)系统中,提高透射光在作物冠层的漫射率仍然是一个理想的目标。这是因为漫射光能提高光分布的均匀性,并能更深入地穿透紧凑的作物冠层,从而提高光合作用率和作物产量。目前在温室和开放式园艺系统中使用的方法包括散射膜、散射玻璃和光散射涂层。虽然这些方法都很有效,但将它们与光伏组件结合应用于 AV 温室和其他 AV 农业实践中的情况仍相对未知。然而,几乎没有人对现有光伏组件结构材料(如玻璃、封装材料和透明背板)的光散射特性进行过评估。因此,这项工作通过雾度和 Hortiscatter 测量来研究晶体硅光伏组件材料的光散射行为。制造并实验测试了 18 个样品,其结构布局为玻璃/封装材料/封装材料/后盖(玻璃或透明聚合物背板),并使用了不同的商用封装材料。在样品的光学表征中使用了光合光谱光。此外,还测试了紫外线降解对朦胧度的影响,并进一步评估了光分布的均匀性,以获得 Hortiscatter。研究结果表明:(i) 透明背板增加了光的扩散性。(ii) 紫外线降解降低了大多数光伏材料的光散射。(iii) 对于雾度最大的透明背板样品,透射光的分布随入射角度的增加而增加,并随可见光谱波长的增加而减少 (iv) 采用玻璃/TPO/TPO/透明背板布局的样品获得的最高雾度和 Hortiscatter 值分别高达 80% 和 84%。(v) 雾度和 Hortiscatter 值有助于优化 AV 应用的光伏组件材料清单。
Assessing the light scattering properties of c-Si PV module materials for agrivoltaics: Towards more homogeneous light distribution in crop canopies
Increasing the diffusivity of transmitted light at crop canopies in agrivoltaic (AV) systems remains a desired objective. This is because diffuse light increases the uniformity of light distribution and penetrates deeper into compact crop canopies thereby enhancing the photosynthesis rate and crop yields. Current approaches in greenhouses and open horticultural systems involve the use of diffusing films, diffuse glass, and light diffusing coatings. While these methods are effective, their combination with photovoltaic (PV) modules in AV greenhouses and other AV farming practices remain relatively unknown. However, little to no work has been done to assess the light scattering properties of the existing PV module structural materials such as the glass, encapsulants and the transparent backsheet. This work therefore investigates the light scattering behaviour of c-Si PV module materials through haze and Hortiscatter measurements. 18 samples with the structural layout of glass/encapsulant/encapsulant/back cover (glass or transparent polymer backsheet), applying different commercial encapsulants, were manufactured and tested experimentally. Light in the photosynthetic spectrum was used in the optical characterization of the samples. Furthermore, the impact of UV degradation on the haziness was also tested and the uniformity of the light distribution was further assessed to obtain the Hortiscatter. The findings indicated that (i) Transparent backsheets increased the light diffusivity. (ii) UV degradation reduced the light scattering of most of the PV materials. (iii) For the haziest transparent backsheet sample, the distribution of the transmitted light increased with the incidence light angle and reduced with increasing wavelength in the visible spectrum (iv) Highest haze and Hortiscatter values of up to 80% and 84% respectively were obtained for a sample with glass/TPO/TPO/transparent backsheet layout. (v) Haze and Hortiscatter values could help in optimising the PV module bill of materials for AV applications.
期刊介绍:
Solar Energy welcomes manuscripts presenting information not previously published in journals on any aspect of solar energy research, development, application, measurement or policy. The term "solar energy" in this context includes the indirect uses such as wind energy and biomass