A CFD evaluation of naturally ventilated, multi-span, sawtooth greenhouses

M. Kacira, T. H. Short, R. R. Stowell

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


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 languageEnglish (US)
Pages (from-to)833-836
Number of pages4
JournalTransactions of the American Society of Agricultural Engineers
Issue number3
StatePublished - May 1998


  • Computational fluid dynamics
  • Fluent
  • Greenhouse cooling
  • Natural ventilation
  • Sawtooth greenhouse

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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