Solar irradiation consists of direct (unobstructed, parallel) light and diffuse (scattered, not parallel) light.įresnel optics split these two components, focusing the direct light and transmitting the diffuse light virtually unaltered.īy substantially reducing the direct light component with Fresnel optics, the heat load in the greenhouse and the irradiation reaching the crop can be considerably reduced.įurthermore, usable energy can be generated from the focused direct light, offering an attractive alternative for conventional energy sources.ĭuring the present study, a transparent pyramid-shaped concentrator was designed and constructed based on a flat Fresnel lens of 30×30 cm and a focal length of 30 cm.

These issues can be tackled simultaneously by use of Fresnel concentrating optics, that can be readily installed in the greenhouse. When the solar irradiation is high, two important concerns for greenhouse growers are: 1) options to control the irradiation on the crop, and 2) the high heat load generated in the greenhouse. Smitįresnel lenses, concentrating solar energy, energy system, greenhouse, heat-load reduction ISHS Acta Horticulturae 1296: International Symposium on Advanced Technologies and Management for Innovative Greenhouses: GreenSys2019 A concentrating solar system to reduce greenhouse heat load and generate energy A concentrating solar system to reduce greenhouse heat load and generate energy

Solarcell heated greenhouse