THE INFLUENCE OF REAL TIME FILTERING STRATEGIES ON OPTIMAL CO₂ CONCENTRATION FOR A GREENHOUSE LETTUCE CROP – REFEREED PAPER –

Mathematical models of a lettuce crop and of CO₂ loss from a greenhouse have been developed into a form suitable for maximizing grower income by optimizing CO₂ concentration.
Analytical relationships for the optimal CO₂ concentration were set up as a function of incident radiation, ventilation rate and the ratio of lettuce price to CO₂ cost.
The effect of various real time sampling and filtering strategies on the daily dynamic optimal CO₂ concentrations are assessed.
Backward moving averages of time windows of up to 30 min are compared.
Correlation between the patterns of incident radiation and those of optimal CO₂ concentration are investigated by phase unwrapping and spectral methods.
Sensitivity analysis of optimal CO₂ concentrations to perturbations in ventilation rate are discussed.

IV International Symposium on CO2 in Protected Cultivation

Z. Chalabi, D. Critten

https://doi.org/10.17660/ActaHortic.1990.268.12