Wind-driven natural ventilation of greenhouses with vegetation

Chia Ren Chu, Ting Wei Lan, Ren Kai Tasi, Tso Ren Wu, Chih Kai Yang

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A large eddy simulation (LES) model was used to examine the wind-driven cross ventilation of gable-roof greenhouses containing vegetation. The obstruction of air flow by vegetation was described by a porous drag model in the numerical model, and the simulation results were validated using wind tunnel experiments. The numerical model was then utilised to inspect the influences of vegetation and greenhouse length (in the wind direction) on the ventilation rate. The results revealed that the diminishing effects of the vegetation, insect screen and internal friction on the ventilation rate can all be quantified by a physical-based resistance model. The driving force (the difference between windward and leeward pressures) of long, multi-span greenhouses was found to be less than that of a short, single-span greenhouse leading to a lower ventilation rate. The resistance factor of the vegetation and the insect screen depends on their porosity, while the resistance factor of the internal friction increased as the greenhouse length increased. In addition, the internal friction of multi-span greenhouses should be considered when the length of the greenhouse was greater than six times the greenhouse height.

Original languageEnglish
Pages (from-to)221-234
Number of pages14
JournalBiosystems Engineering
Volume164
DOIs
StatePublished - Dec 2017

Keywords

  • Greenhouse
  • Large Eddy Simulation
  • Porous drag model
  • Vegetation
  • Wind-driven ventilation

Fingerprint

Dive into the research topics of 'Wind-driven natural ventilation of greenhouses with vegetation'. Together they form a unique fingerprint.

Cite this