Electrical energy generated by photovoltaic modules mounted inside the roof of a north-south oriented greenhouse

A. Yano, A. Furue, M. Kadowaki, T. Tanaka, E. Hiraki, M. Miyamoto, F. Ishizu, S. Noda

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Four amorphous-silicon photovoltaic (PV) modules were arranged in an arch formation at the northern end of the Gothic-arch style roof of a north-south oriented greenhouse. Two were attached to the inner surface of the east roof with tilt angles of 20° (PV1) and 28° (PV2). The other two were attached to the inner surface of the west roof with tilt angles of 20° (PV3) and 28° (PV4). Each module (832 mm × 412 mm) was lightweight (0.42 kg) and flexible with rated power of 24 W and the efficiency of 7%. The total area of PV1-PV4 was 1.7 m2, which corresponded to 1.5% of the roof area. During seven months, PV1-PV4 generated 71.6 MJ in total. Modules with lower tilt angle generated more energy. West-roof mounted modules generated more energy than was generated by east-roof mounted modules because the greenhouse was oriented 7.03° from true north-south. Yearly generated energy was calculated by assuming cloudless skies. The PV3 unit generated the maximum energy of 119.4 MJ y-1. These results show that the low tilt-angle module generates more electrical energy when it is mounted inside the roof of a north-south oriented greenhouse.

Original languageEnglish
Pages (from-to)228-238
Number of pages11
JournalBiosystems Engineering
Volume103
Issue number2
DOIs
Publication statusPublished - Jun 2009

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Food Science
  • Animal Science and Zoology
  • Agronomy and Crop Science
  • Soil Science

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