ISHS Acta Horticulturae 106: Symposium on Computers in Greenhouse Climate Control
A MODELLING APPROACH TO GREENHOUSE VENTILATION CONTROL |
| Authors: | T. Kozai, S. Sase, M. Nara |
| Abstract:
A computational model is developed to predict the number of air changes and air temperature in a greenhouse under natural ventilation. The core of the model consists of two equations: one for expressing the balance of motive force and the resistance of ventilator opening to the air flow, and one for heat balance. The next step would be to incorporate it as a submodel of greenhouse environment model with crop growth submodel and solar light transmission submodel in a microcomputer for greenhouse ventilation control. Results for a single-span greenhouse with continuous roof and side ventilators indicate that the number of air changes, thus, the inside air temperature varies considerably with the change of angle of ventilator opening, wind speed, wind direction, etc. The results illustrate how a model of this kind can be used in the computer control of greenhouse environment and in the design of greenhouse structure. | |
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