Japan International Research Center for Agricultural Sciences | JIRCAS

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

Japan Agricultural Research Quarterly
ISSN
00213551
NII recode ID (NCID)
AA0068709X
Full text

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.

Date of issued2004-10-01
CreatorKACIRA MuratSASE SadanoriOKUSHIMA Limi
Subject

CFD

greenhouse design

optimization

PublisherJapan International Research Center for Agricultural Sciences
Dates2004-10-01
NII resource type vocabularyJournal Article
Volume38
Issue4
spage227
epage233
DOI10.6090/jarq.38.227
RightsJapan International Research Center for Agricultural Sciences
Languageeng