(1998) Fluid Dynamics Simulation of A Naturally Ventilated Multi-span Greenhouse



Journal: The Korean Society of Agricultural Engineers Vol.40 p.31~38
 
Author: In-Bok Lee, Ted H. Short




Abstract

  In spite of the large amount of commercial use of natural ventilation, little information and data were available on full scale multi-span greenhouse designs since direct measurement of air flow velocities and natural ventilation rates was very difficult and expensive. There expecially was interest in computational fluid dynamics(CFD) numerical techniques to analyze air distributions in agricultural structures as well as air quality and thermal conditions. A CFD numerical technique, FLUENT V4.4, was used to predict natural ventilation rates, airflow distributions, temperature distributions, and static pressure distributions in a naturally ventilated four and one-half span, double polyethylene commercial greenhouse at Quailcrest Farm near Wooster, Ohio. The natural air exchange rates were predicted to be 0.86 and 0.54 volume change per minute (A.C./min) respectively when the wind speed of 2.5 m/s came from west and east. The CFD results indicated that the CFD numerical technique could be a powerful tool for evaluating the relative performance of alternative greenhouse designs and internal airflow and thermal distribution patterns.



Keywords: computational fluid dynamics(CFD), greenhouse wentilation, multispan greenhouse, natural ventilation


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