ISHS Acta Horticulturae 229: Symposium on Biological Aspects of Energy Saving in Protected Cultivation
DYNAMIC OPTIMIZATION OF THE CO2 CONCENTRATION IN GREENHOUSES: AN EXPERIMENT WITH CUCUMBER (CUCUMIS SATIVUS L.) |
| Author: | E.M. Nederhoff |
| Abstract:
In an experiment with cucumber, dynamic optimization of the CO2 concentration in greenhouses was tested. In on-line simulation calculations both the costs and the yield of CO2 enrichment were calculated. Economic data and on-line measured radiation, windspeed and window aperture were used as input data. The CO2 concentration which came out to be economically optimal, was passed as setpoint to a CO2 control programme. With optimization, CO2 is supplied selectively: at more ventilation the calculated optimal CO2 setpoint is lower and at better light conditions the setpoint is higher. Two continuous CO2 levels (300 and 500 ppm) and two treatments with optimization were compared. Optimization resulted in a high production of cucumber and a relatively low expenditure of CO2. | |
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