Sharpe, Peter et Lubitz, William. 2025. « Measurements and simulation of internal fan-driven airflow in a commercial greenhouse ». Communication lors de la conférence : CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025).
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Résumé
Increasingly in large scale commercial greenhouses, internal fans are deployed as a tool to help optimize growing conditions. Fans are typically mounted near the ceiling in a grid pattern with the flow direction parallel to crop rows. Fans are typically run at a constant speed, full time. The resulting airflow helps regulate temperature, and humidity, distribute carbon dioxide, and aid in plant transpiration. This study examines a specific fan type and spatial configuration in a seven-meter-tall 2.6-hectare Venlo style greenhouse, with a mature crop of vertically grown vine tomatoes. Ultrasonic air velocity measurements in three dimensions were taken at prescribed locations for comparison with the CFD simulation. In addition, the fan’s output was also measured in a refined grid pattern to better understand it’s flow pattern, and to establish the necessary input flow pattern used in a CFD simulation. The simulation uses the k-e turbulence closure model, representing a domain for a repeating section of the greenhouse, and accounts for momentum losses due to the crop, as a porous media, as well as the surrounding support structure and the end walls perpendicular to the airflow direction. The side walls of the repeating domain are given a paired cyclic boundary condition. The results of the simulation are compared with the measurements, and suggestions for refinement and improvement are made. Also, a preliminary look how light abatement curtains may impact the overall flow pattern is presented.
| Type de document: | Communication (Communication) |
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| Informations complémentaires: | Progress in Canadian Mechanical Engineering, Volume 8. Co-chairs: Lucas A. Hof, Giuseppe Di Labbio, Antoine Tahan, Marlène Sanjosé, Sébastien Lalonde and Nicole R. Demarquette. |
| Date de dépôt: | 18 déc. 2025 14:39 |
| Dernière modification: | 18 déc. 2025 14:39 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32171 |
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