In Northern Europe the production of ornamental pot plants in greenhouses requires use of supplemental light, as light is a restricting climatic factor for growth from late autumn until early spring. To make this production ecologically and economically sustainable there is an urgent need for energy and cost-efficient climate control strategies that do not compromise product quality. In this paper, we present a novel approach addressing dynamic control of supplemental light in greenhouses aiming to decrease electricity costs and energy consumption without loss in plant productivity. Our approach uses weather forecasts and electricity prices to compute energy and cost-efficient supplemental light plans, which fulfils the production goals of the grower. The approach is supported by a set of newly developed planning software, which interfaces with a greenhouse climate computer. The planning algorithm is based on a new plant physiological understanding that utilizes the natural plasticity in plants to irregular light periods. The results revealed that different light control strategies using three different set points of daily photosynthesis integral (DPI) compared to a control treatment resulted in large daily variation in the distribution and duration of light periods and daily light integrals (DLI). However, plant growth and flowering was mainly affected by differences in average DLI and marginally affected by the irregular light periods and a 25% reduction in electricity use and cost was achieved without any noticeable reductions in plant quality.
|Tidsskrift||Computers and Electronics in Agriculture|
|Status||Afsendt - 2018|
Mærsk-Møller, H. M., Kjær, K. H., Ottosen, C-O., & Jørgensen, B. N. (2018). DYNALIGHT DESKTOP: A GREENHOUSE CONTROL SYSTEM TO OPTIMIZE THE ENERGY COST-EFFICIENCY OF SUPPLEMENTARY LIGHTING. Manuskript afsendt til publicering.