The production of electricity never hinders the crop

The element that distinguishes a greenhouse from other buildings is the transparency of the roof, determined by the need to use sunlight as an indispensable fuel for photosynthesis. When greenhouses become photovoltaic it is evident that a portion of light is subtracted from the crop

The element that distinguishes a greenhouse from other buildings is the transparency of the roof, determined by the need to use sunlight as an indispensable fuel for photosynthesis. When greenhouses become photovoltaic it is evident that a portion of light is subtracted from the crop, but it is equally evident that the various types of plants have different needs in the growth and maturation process.

Sunlight is rarely excessive for crops, but it is equally true that a correct modulation of the quantity can be beneficial; in fact it is important to identify the "compensation light intensity" which in herbaceous plants C4 is 8-25, in cultivated herbaceous species C3 is instead 8-15 with a light saturation between 200 and 600 watts per m2.

Compared to humans, plants have a different sensitivity to light, in fact only a fraction of the light visible to the human eye contributes to their growth (photosynthesis), i.e. light with a wavelength between 400 and 700 nm, which is the PAR (Photosynthetically Active Radiatio) zone.

About 45% of the total radiation of sunlight is the so-called PAR zone.

Therefore the daily light that crops need is determined by the DLI (Daily Light Integral) where the DLI = PPFD (μmol / m2) x 3,600 (s / h) x photoperiod (hours / day), so we can imagine the behavior of photons as if they were droplets of water. The instantaneous light level in μmol / mq s is the number of droplets collected in one square meter of surface per second. In the same way, however, we can consider the number of total droplets that fall in a day or in 18 hours of light, measuring the water level in the evening, calling it the 'daily integral of light' μmol / m2 day.

Therefore, our work in the last decade has developed taking into account these factors that have conditioned the design development of photovoltaic greenhouse structures.

To deepen the topic

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mastermas

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Calculate the DLI (Daily light integral) of the greenhouse you have in mind. Starting from the Italian geographical area concerned and knowing the limiting factors, in terms of the reduction of light radiation determined by the structure and material chosen as roofing, you can calculate the DLI of your project.

Energy green house photovoltaic rooftop solar
Naturae Plena

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