ISHS Acta Horticulturae 406: II IFAC/ISHS Workshop :Mathematical & Control Applications in Agriculture & Horticulture
USE OF A PHYSICALLY BASED MODEL TO MODEL THE TEMPERATURE AND HUMIDITY IN AN IMPERFECTLY MIXED VENTILATED SPACE |
| Authors: | D. Berckmans, M. De Moor |
| Abstract:
A general model concept has been developed and described in which a model based on physical laws is linked with a mathematical identification procedure to model the dynamic behaviour of the three-dimensional air flow pattern and the resulting energy and mass concentration in an imperfectly mixed fluid. The objective of this paper is to explain the concept by describing the physical meaning of the different variables and to give measurement results that confirm the value of this approach. The experimental data were obtained in a ventilated space for different values of the ventilation rate and heat supply. There were corresponding differences in the quantified air flow pattern and the resulting measured and visualised position, shape and dimensions of the well mixed zones of temperature and moisture. The advantages of attaching a physical meaning to system identification is the ease to understand the model and the fast applicability to different systems. The physically meaningful approach on the other hand makes it more difficult to realise a model based controller. | |
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