Articles
TEMPERATURE AND AIRFLOW PREDICTIONS FOR MULTI-SPAN NATURALLY VENTILATED GREENHOUSE
Article number
578_16
Pages
141 – 152
Language
English
Abstract
Natural ventilation system alternatives were evaluated using a computational fluid dynamics (CFD) numerical model.
Wind speed and direction, side vent opening size and location were studied with respect to airflow patterns and temperature distributions.
Side vent opening size was shown to strongly affect the air temperatures in the greenhouse for a west wind while having little influence on an east wind.
It was predicted that a low side vent at plant height would result in the best temperature and airflow patterns for both wind directions.
For a high side vent located 2.5m above floor and a west wind of 2 5m/s, 59% of the incoming air through the side vent was predicted to move out through the first roof vent opening and result in very high inside air temperatures.
Wind speed and direction, side vent opening size and location were studied with respect to airflow patterns and temperature distributions.
Side vent opening size was shown to strongly affect the air temperatures in the greenhouse for a west wind while having little influence on an east wind.
It was predicted that a low side vent at plant height would result in the best temperature and airflow patterns for both wind directions.
For a high side vent located 2.5m above floor and a west wind of 2 5m/s, 59% of the incoming air through the side vent was predicted to move out through the first roof vent opening and result in very high inside air temperatures.
Publication
Authors
T.H. Short, I. Lee
Keywords
computational fluid dynamics, CFD, greenhouse ventilation, natural ventilation, aerodynamic models, controlled environment agriculture
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