論文

査読有り 本文へのリンクあり
2016年1月15日

Advances on the semi-transparent modules based on micro solar cells: First integration in a greenhouse system

Applied Energy
  • Marco Cossu
  • ,
  • Akira Yano
  • ,
  • Zhi Li
  • ,
  • Mahiro Onoe
  • ,
  • Hidetoshi Nakamura
  • ,
  • Toshinori Matsumoto
  • ,
  • Josuke Nakata

162
開始ページ
1042
終了ページ
1051
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.apenergy.2015.11.002
出版者・発行元
Elsevier BV

© 2015 Elsevier Ltd. 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 (1.2mm diameter) sandwiched between glass plates and integrated on a greenhouse roof with 26.5° slope. The STM was 910mm long and 610mm 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 1m 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.

リンク情報
DOI
https://doi.org/10.1016/j.apenergy.2015.11.002
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84947983627&origin=inward 本文へのリンクあり
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