Solar radiation distribution inside a greenhouse with south-oriented photovoltaic roofs and effects on crop productivity

摘要: Abstract This study assessed the climate conditions inside a greenhouse in which 50% of roof area was replaced with photovoltaic (PV) modules, describing solar radiation distribution and variability temperature humidity. The effects shading from PV array on crop productivity were described tomato, also integrating natural supplementary lighting powered by energy. Experiments performed an east–west oriented (total 960 m 2 ), where south-oriented roofs completely covered multi-crystalline silicon total rated power 68 kWp. system reduced availability 64%, compared to situation without (2684 MJ m −2 yearly basis). followed north–south gradient, more energy sidewalls decreasing towards center span, except winter, it similar all plant rows. reduction under plastic covers respectively 46% 82% basis. Only 18% observed rows farthest cover span. lighting, exceeding produced array, not enough affect production, whose revenue lower than cost for heating lighting. is useful choosing most suitable crops designing greenhouses attitude both production.