国立研究開発法人 国際農林水産業研究センター | JIRCAS

Effects of Side Vents and Span Numbers on Wind-Induced Natural Ventilation of a Gothic Multi-Span Greenhouse

JARQ : Japan Agricultural Research Quarterly
ISSN
00213551
書誌レコードID(総合目録DB)
AA0068709X
本文フルテキスト

In this paper, the effects of wind speed, side ventilators and span numbers on gothic type multi-span greenhouse natural ventilation were studied by numerical simulation using the Computational Fluid Dynamics (CFD) approach. The realizable k-ε model was used for the turbulence model in the simulations. The results showed that the maximum greenhouse ventilation rate was achieved when both side and roof vents were used for ventilation. Without the existence of buoyancy effect in the computations, it was found that the ventilation rate increased linearly with the external wind speed in all the cases studied. The ratio of the opening of the ventilator area to the greenhouse floor area, 9.6%, was found to be small compared to the recommended ratios of 15-25%. The results showed that a significant reduction in ventilation rate was determined as the number of spans was increased and an exponential decay explained the relationship between the ventilation rate and the number of spans.

刊行年月2004-10-01
作成者KACIRA MuratSASE SadanoriOKUSHIMA Limi
著者キーワード

CFD

greenhouse design

optimization

公開者Japan International Research Center for Agricultural Sciences
データ作成日2004-10-01
国立情報学研究所メタデータ主題語彙集(資源タイプ)Journal Article
38
4
開始ページ227
終了ページ233
DOI10.6090/jarq.38.227
権利Japan International Research Center for Agricultural Sciences
言語eng