The effect of thermal conditions on CO2 distribution in a greenhouse

An experiment was conducted to determine the extent to which the distribution of CO₂ depended on the thermal conditions within a greenhouse. The CO₂ levels and the change in the horizontal temperature gradient were measured throughout the greenhouse. The appropriate level of CO₂ and the concentrated mass of CO₂ were analyzed at predetermined points to verify the relation between CO2 and temperature to establish whether a constant distribution existed throughout the facility. As a result, when using the membrane system, the CO₂ concentrations external and internal to the greenhouse were measured to be 380~440 ppm and 1020 ppm, respectively. The efficiency of the membrane system was shown to be about 268%. The highest CO₂ concentration was about 1000 ppm near the floor, where the temperature was the lowest. In contrast, at a height of 2.50 m, where the temperature was the highest, the CO₂ concentration was the lowest at about 400~500 ppm.

Tropical Agricultural Research Vol. 26 (4): 714 – 720 (2015)