GLASSHOUSE WITH CLOSED COVER AND VENTILATION SYSTEM FOR AIR TREATMENT

This glasshouse was originally designed by the Technical University of Delft in co-operation with the glasshouse company Hordijk B.V. A ventilation system with evaporative cooling and air ducts was tested in a small glasshouse compartment at the IMAG in Wageningen.
After succesful results, a large scale (1400 m2) prototype of the glasshouse was built at the GCRS in 1989. The potential advantages of this glasshouse are: high light transmission, less air exchange and consequently higher CO2 levels, reduction of pests (and consequently chemicals) by filtering ventilation air, improved humidity control.
During the first years the experiments were designed to optimize the ventilation system (sound level, ventilation capacity, air ducts, evaporative cooling) and the control-algorithms.
Based on these results the ventilation system was altered and one single unit was tested by the TFDL.

The air ducts were replaced by polystyrene channels.
The maximum ventilation capacity is about 85 m3.m-2.h-1, which, combined with the evaporative cooling system, has proven to be sufficient for realizing an acceptable indoor climate.
The incoming air is now being filtered through a 100 micron filter system to prevent entering of insects.

European Seminar New Technologies for the Rational Use of Energy in Greenhouse Horticulture in Northern Europe

J.C. Bakker

https://doi.org/10.17660/ActaHortic.1992.312.15