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SE—Structures and Environment: A Strategy for Greenhouse Climate Control, Part I: Model Development

✍ Scribed by M. Trigui; S. Barrington; L. Gauthier

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
226 KB
Volume
78
Category
Article
ISSN
0021-8634

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✦ Synopsis

This paper presents an algorithm developed to predict the dynamic ambient greenhouse air conditions which optimize net pro"ts for the production of a greenhouse tomato crop. Pro"ts are equated to the crop yield value less the energy costs for heating and dehumidi"cation and the CO injection cost. The climatic conditions considered are CO level, temperature, relative humidity and incident radiation. These are varied dynamically for every time interval spanning the harvesting period.

The algorithm has two sub-programs. For sets of selected internal climatic parameters, the "rst calculates crop yield, and the second calculates energy costs (heating and dehumidi"cation) with reference to predicted exterior climatic conditions (solar radiation, temperature, wind velocity and relative humidity). These two algorithms are then used to predict the particular set of climatic parameters, adjusted for each time interval over the harvesting period, that will maximize the crop yield value less the energy costs.

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