EXPERIMENTAL APPARATUS
The solar greenhouse
A semi-cylindrical 176 m: greenhouse (8 × 22 m) with a double skin extruded
polycarbonate cover was constructed with an east-west oriented ridge for maximum solar gains in winter. It was then equipped with an auxiliary air
heating system (20 kW) and a 20 vol h-1 active ventilation system, both
activated by thermostats to keep the inside air temperature within preset
limits.