Advances on the semi-transparent modules based on micro solar cells: First integration in a greenhouse system
Advances on the semi-transparent modules based on micro solar cells: First integration in a greenhouse system
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DOI：
10.1016/j.apenergy.2015.11.002
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发表时间：
2016-01-15
期刊：
影响因子：
11.2
通讯作者：
Nakata, Josuke
中科院分区：
文献类型：
--
作者：
Cossu, Marco;Yano, Akira;Nakata, Josuke
球形微电池是一种半透明光伏（PV）技术，有助于提高温室系统的可持续性。以前的原型在实验室条件下进行了测试，但尺寸不适合温室屋顶应用。在这项工作中，一个新的原型已经开发和测试的真实的温室屋顶。半透明光伏组件（STM）由4800个球形硅微电池（直径1.2 mm）夹在玻璃板之间组成，并集成在26.5度坡度的温室屋顶上。STM长910 mm，宽610 mm，以匹配温室框架的尺寸。覆盖有微单元的STM区域的百分比为2.3%，考虑到金属导体，达到9.7%。细胞密度为2个细胞cm（-2），半透明区域的测量垂直光透射率为73%。原型的特性进行了比较与传统的平面多晶硅组件（CPM）。在太阳光入射角较宽的情况下，组件转换效率稳定在0.2%左右。当从距离屋顶超过1米的距离观察时，微电池从未完全遮蔽入射太阳光，使遮蔽水平保持在9.7%。STM的屈服因子略高于CPM，因为球形单元的各向同性性质，其能够使用天空入射和地面反射的辐射用于能量生产，而不管模块斜率如何。原型STM是有前途的温室屋顶应用，其性能可以通过提高转换效率来改善。(C)2015爱思唯尔有限公司版权所有。
The spherical micro-cells are a semi-transparent photovoltaic (PV) technology which can contribute to improve the sustainability of greenhouse systems. Previous prototypes were tested in laboratory conditions, but the size was not suitable for the greenhouse roof application. In this work, a new prototype has been developed and tested on a real greenhouse roof. The semi-transparent PV module (STM) was composed by 4800 spherical silicon micro-cells (1.2 mm diameter) sandwiched between glass plates and integrated on a greenhouse roof with 26.5 degrees slope. The STM was 910 mm long and 610 mm wide to match the size of the greenhouse framework. The percentage of the STM area covered with micro-cells was 2.3%, reaching 9.7% considering the metallic conductors. The cell density was 2 cells cm(-2) and the measured perpendicular light transmissivity of the semi-transparent area was 73%. The characteristics of the prototype were compared with those of a conventional planar multi-crystalline silicon module (CPM). The module conversion efficiency was steadily around 0.2% over wide incident sunlight angle. The micro-cells never completely eclipse the incident sunlight when observed from more than 1 m distance from the roof, keeping the eclipsing level at 9.7%. The yield factor of the STM was slightly higher than the CPM because of the isotropic properties of the spherical cells, which are able to use both the sky-incident and the ground-reflected irradiation for energy production, irrespective of the module slope. The prototype STM is promising for greenhouse roof applications and its performance can be improved by increasing the conversion efficiency. (C) 2015 Elsevier Ltd. All rights reserved.