Πλοήγηση ανά Συγγραφέα "Boulard, T."
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Air flow and associated sensible heat exchanges in a naturally ventilated greenhouse
Boulard, T.; Papadakis, G.; Kittas, C.; Mermier, M. (1997)In order to investigate the three-dimensional nature of the air flow within the greenhouse, a three-dimensional sonic anemometer was used for the direct measurement of air and heat exchange inside the greenhouse and through ... -
Air flow, temperature and humidity patterns in a greenhouse tunnel
Boulard, T.; Wang, S.; Haxaire, R.; Kittas, C.; Papadakis, G.; Mermier, M. (1999)Air distribution and climatic heterogeneity in greenhouses interfere with plants activity and influence largely crop activity and more particularly transpiration and photosynthesis. This is particularly true for the tunnel, ... -
CLOSYS: Closed system for water and nutrient management in horticulture
Marcelis, L. F. M.; Dieleman, J. A.; Kittas, C.; De Groot, F.; Buschmann, C.; Van Loon, A.; Boulard, T.; Brajeul, E.; Kocsanyi, L.; Garate, A.; Wieringa, G. (2006)The EU project CLOSYS aimed at developing a CLOsed SYStem for water and nutrients in horticulture. The main objective was to control water and nutrients accurately such that pollution is minimized and crop quality enhanced. ... -
Convective and ventilation transfers in greenhouses, Part 1: the greenhouse considered as a perfectly stirred tank
Roy, J. C.; Boulard, T.; Kittas, C.; Wang, S. (2002)In this paper, the characterization and modelling of the most relevant convective transfers contributing to the elaboration of the greenhouse climate are reviewed. Convective transfers include heat and mass transfers between ... -
Convective and ventilation transfers in greenhouses, part 2: Determination of the distributed greenhouse climate
Boulard, T.; Kittas, C.; Roy, J. C.; Wang, S. (2002)In this paper, the characterisation and modelling of the most relevant convective transfers contributing to the description of the distributed greenhouse climate are studied in detail. After a brief review of the equations ... -
Effect of vent arrangement on windward ventilation of a tunnel greenhouse
Bartzanas, T.; Boulard, T.; Kittas, C. (2004)The effect of ventilation configuration of a tunnel greenhouse with crop on airflow and temperature patterns was numerically investigated using a commercial computational fluid dynamics (CFD) code. The numerical model was ... -
The effect of vent configuration and insect screens on greenhouse microclimate
Bartzanas, T.; Katsoulas, N.; Kittas, C.; Boulard, T.; Mermier, M. (2005)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 ... -
Effect of vent opening and insect screens on greenhouse microclimate distribution
Kittas, C.; Katsoulas, N.; Bartzanas, T.; Boulard, T.; Mermier, M. (2006)The objective of this work was to experimentally investigate the influence of vent type (side, roof or both) and of an anti-aphid insect screen on airflow and temperature distribution of a mono span greenhouse round arch ... -
Effect of Vent Openings and Insect Screens on Greenhouse Ventilation
Katsoulas, N.; Bartzanas, T.; Boulard, T.; Mermier, M.; Kittas, C. (2006)The objective of this work was to experimentally investigate the influence of vent type (side, roof or both) and of an anti-aphid insect screen used to prevent insect intrusion on the ventilation rate of a round arch with ... -
Experimental and modelling analysis of pesticide fate from greenhouses: The case of pyrimethanil on a tomato crop
Katsoulas, N.; Boulard, T.; Tsiropoulos, N.; Bartzanas, T.; Kittas, C. (2012)The distribution of a pesticide on target and non-target elements of a greenhouse, and its fate after application, was studied. The experiments were performed in a round arched greenhouse with vertical side walls containing ... -
Experimental results and spatial simulation of climate in a greenhouse with insect screens
Bartzanas, T.; Fidaros, D.; Boulard, T.; Katsoulas, N.; Kittas, C. (2011)Aim of the present paper was to present, analyze and compare detailed experimental data and CFD simulation results in a greenhouse equipped with insect screens. The studied greenhouse was a round arch type with vertical ... -
Greenhouse ventilation rates through combined roof and side openings: An experimental study
Kittas, C.; Papadakis, G.; Boulard, T. (1997)A simple statistical relation between the ventilation rate of a greenhouse and its roof and side openings was proposed and tested on experimental data. This relation combines thermal buoyancy and wind effects as driving ... -
THE IMPACT OF INSECT SCREENS AND VENTILATION OPENINGS ON THE GREENHOUSE MICROCLIMATE
Kittas, C.; Katsoulas, N.; Bartzanas, T.; Mermier, M.; Boulard, T. (2008)The objective of this work was to experimentally investigate the influence of vent type (side, roof, or both) and of anti-aphid insect screens on airflow, air temperature, and air vapor pressure deficit distribution in a ... -
Influence of an insect screen on greenhouse ventilation
Kittas, C.; Boulard, T.; Bartzanas, T.; Katsoulas, N.; Mermier, M. (2002)The influence of an insect screen on ventilation rate was experimentally investigated in a multispan glass-covered greenhouse equipped with a continuous roof vent, located at the University of Thessaly near volos in the ... -
Natural ventilation of a greenhouse with ridge and side openings: Sensitivity to temperature and wind effects
Kittas, C.; Boulard, T.; Papadakis, G. (1997)An air exchange rate model of a Mediterranean greenhouse with ridge and side openings combining temperature and wind effects as driving forces of the natural ventilation was developed and tested on experimental data. it ... -
Natural ventilation performance of six greenhouse and tunnel types
Boulard, T.; Feuilloley, P.; Kittas, C. (1997)The physical basis of natural ventilation is reviewed and the ventilation performance examined of six different greenhouse and tunnel types equipped with either roof or side, or both roof and side vents. Altogether, sixteen ... -
Numerical simulation of the airflow and temperature distribution in a tunnel greenhouse equipped with insect-proof screen in the openings
Bartzanas, T.; Boulard, T.; Kittas, C. (2002)An analysis of the ventilation process in a tunnel greenhouse equipped with an insect-proof screen in the side openings was performed with the use of a commercial computational fluid dynamics (CFD) package (CFD2000(R)). ... -
Numerical simulation of the airflow and temperature patterns in a greenhouse equipped with insect-proof screen in the openings
Bartzanas, T.; Kittas, C.; Boulard, T. (2002)An analysis of the ventilation process in a tunnel greenhouse equipped with an insect-proof screen in the side openings was performed with the use of a commercial computational fluid dynamics (CFD) package (CFD2000®). The ... -
Pressure field and airflow at the opening of a naturally ventilated greenhouse
Boulard, T.; Kittas, C.; Papadakis, G.; Mermier, M. (1998)Direct estimation of airflow at the vent opening by means of differential pressure measurements were performed in a twin-span greenhouse equipped with a continuous vent at the gutter. Application of Bernoulli's equation ... -
QUANTIFICATION OF THE VENTILATION OF A GREENHOUSE WITH A ROOF OPENING
Kittas, C.; Draoui, B.; Boulard, T. (1995)Measurements of air exchange rates were performed in situ in a glasshouse equipped with a continuous roof opening. These measurements were carried out using the decay rate method with N2O as tracer gas. Simultaneously, ...