Abstract
A computational fluid dynamics (CFD) program, Fluent V4, was used to predict natural ventilation rates and airflow patterns of a multi-span sawtooth greenhouse for various roof and side vent openings and outside wind speeds. Predicted rates were found to be both well above and well below a standard volumetric air exchange rate of l.0 A.C. min-1. The maximum and most acceptable ventilation rates were obtained with the combined use of a windward side vent and leeward roof vents on all multi-span sections. Ventilation rates ranged from 1.4 to 4.01 A.C. min-1 for the best two-span case and 0.14 to 2.0 A.C. min-1 for the similar four-span case for outside wind speeds of 0. 5 and 2.0 m s-1, respectively. Predicted ventilation rates ranged from 0.17 to 0.7 A.C. min-1 when no side vent was used and the roof vents were fully open.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 833-836 |
| Number of pages | 4 |
| Journal | Transactions of the American Society of Agricultural Engineers |
| Volume | 41 |
| Issue number | 3 |
| State | Published - May 1998 |
| Externally published | Yes |
Keywords
- Computational fluid dynamics
- Fluent
- Greenhouse cooling
- Natural ventilation
- Sawtooth greenhouse
ASJC Scopus subject areas
- Agricultural and Biological Sciences (miscellaneous)