Paper 1: Volume 4 No.3 December 2005 Edition
The
Effect of Vent Configuration and Insect Screens on
Greenhouse Microclimate
T.
Bartzanas1,
N. Katsoulas1
, C. Kittas1, T. Boulard2 and M. Mermier3
1University of
Thessaly
, Department of Agriculture Crop Production and Rural Environment,
Fytokou St. N.
Ionia
Magnisias
38446
,
Greece
2INRA-URIH
400, Route des Chappes, BP 167, 06903 Sophia Antipolis, France
3INRA
d'Avignon; Unité de Bioclimatologie, Site Agroparc, 84914, Avignon Cedex
9, France
Abstract
The influence of insect screens and vent configurations on airflow and
temperature patterns in an arched plastic covered greenhouse used for
cultivating tomatoes was analysed using a commercial computational fluid
dynamics (CFD) code. The numerical model was first validated against
experimental measurements which were carried out in an equivalent
greenhouse incorporating continuous side openings. Measurement data
included the three Cartesian components of air velocity, determined by
means of a sonic anemometer, and the spatial distribution of air
temperature measured using a fast response temperature sensor. The
experimental data were used to define proper and realistic boundary
conditions for use in the numerical model. Numerical results predicted a
gradual increase of air temperature and a decrease of air velocity as the
porosity of the tested insect screen was reduced. It was found that vent
configuration affects the ventilation rate and the climate distribution
inside the greenhouse.
Key words: CFD,
ventilation rate, tunnel greenhouse, insect screens, vent configuration,
airflow, temperature distribution, experimental verification.
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IJV Volume 4 No 3
Contents
Paper
1: Vent Configuration
Paper
2: Passive Cooling
Paper
3: Post Occupancy
Paper
4: Hybrid Ventilation
Paper
5: Bioclimate
Paper
6: Human Factors
Paper
7: CFD Reliability
Paper
8: Wind Pressure
Paper 9: Similarity
Concept
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