ISHS Acta Horticulturae 170: Greenhouse Construction and Covering Materials
INFLUENCE OF DIFFERENT GLAZING MATERIALS ON THE LIGHT TRANSMISSIVITY OF GREENHOUSES |
| Author: | H. Bredenbeck |
| Abstract:
Since October 1982 the light transmissivity of three nearly identical greenhouses has been measured at the Institut für Technik in Gartenbau und Landwirtschaft in Hannover. The greenhouses are covered with single glass, double glass and double acrylic (Stegdoppelplatte, Plexiglas, 16 mm). The glasses are 0.6 m wide, while the Stegdoppelplatte of 1.2 m needing less construction parts in the roof area. Before fixing, the Stegdoppelplatte was treated with a 5% SUN-CLEAR solution. The measurements are taken every 10 minutes by KIPP & ZONEN solarimeters and recorded by a micro computer controlled data acquisition system. The transmissivity of the single-glass-covered house was about 55% in winter and about 60% in summer, compared with the measured outside radiation. Values of the double-glass-covered house were about 42% in winter and 49% in summer. The transmissivity of the Stegdoppelplatte ranged from 60 to 64%. There was no significant differences between winter and summer. It was also noticed, that no water was dropping down from the roof onto the plants. This was one effect of the SUNCLEAR treatment. The results show in general, that it is possible to raise the light transmissivity of greenhouses by using a special treated plastic material. | |
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