ISHS Acta Horticulturae 287: II International Symposium on Protected Cultivation of Vegetables in Mild Winter Climates
DYNAMIC OPTIMIZATION OF NIGHT TEMPERATURE IN RELATION TO CLIMATE CONTROL IN GREENHOUSE |
| Author: | G.N. Mavrogianopoulos |
| Abstract:
The primary objective of this study is to provide a biological model for a new design of the greenhouse environmental control. Here are presented biological submodels that form base for optimization of temperature and CO2 in a greenhouse. First is discussed a model that describes their relation between light intensity and gross photosynthesis of single leaves. Second, a simple light distribution model is combined with the model of leaf photosynthesis in order to calculate crop photosynthesis in relation to CO2 concentration and radiation in the greenhouse. Next, a rough estimation of crop respiration is given that is required for the calculation of CO2 and the night and day temperature influence on the production. It is also estimated the energy consumption by the heating system that is required for calculation of the cost of heating. In addition an optimization of the night temperature is proposed through a maximization of the difference between yield (in economic terms) and heating cost. | |
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