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אסיף מאגר המחקר החקלאי
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Simulation model for buoyancy-driven ventilation for a greenhouse cooled by a fogging system
Year:
2006
Source of publication :
Acta Horticulturae
Authors :
Arbel, Avraham
;
.
Barak, Moti
;
.
Shklyar, Alexander
;
.
Volume :
719
Co-Authors:
Facilitators :
From page:
417
To page:
424
(
Total pages:
8
)
Abstract:
A feasibility study was conducted analytically, to evaluate an evaporative cooling system for greenhouses. The system combined uniformly distributed high-pressure fogging nozzles above the plant canopy with natural ventilation, based on thermal effects, with uniform openings in the roof and in the lower part of the side walls. In accordance with this setup, a computer model was established to calculate the required areas for the ventilation openings in the roof and in the side walls, as related to the greenhouse dimensions and the desired conditions in the greenhouse, and in accordance with the ambient conditions. This model is based on the difference between the air densities inside and outside the greenhouse. The results indicate that: (a) it is possible to establish conditions in the desired range during most seasons and in most parts of Israel; (b) natural ventilation based on thermal effects is very sensitive to wind disturbance; (c) the greenhouse length and/or width form a limiting factor(s); and (d) it is a complicated task to control such a system.
Note:
Related Files :
Buoyancy
Evaporative cooling
Fog
greenhouses
Ventilation
Show More
Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
Conference paper
;
.
Language:
English
Editors' remarks:
ID:
19292
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:27
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Scientific Publication
Simulation model for buoyancy-driven ventilation for a greenhouse cooled by a fogging system
719
Simulation model for buoyancy-driven ventilation for a greenhouse cooled by a fogging system
A feasibility study was conducted analytically, to evaluate an evaporative cooling system for greenhouses. The system combined uniformly distributed high-pressure fogging nozzles above the plant canopy with natural ventilation, based on thermal effects, with uniform openings in the roof and in the lower part of the side walls. In accordance with this setup, a computer model was established to calculate the required areas for the ventilation openings in the roof and in the side walls, as related to the greenhouse dimensions and the desired conditions in the greenhouse, and in accordance with the ambient conditions. This model is based on the difference between the air densities inside and outside the greenhouse. The results indicate that: (a) it is possible to establish conditions in the desired range during most seasons and in most parts of Israel; (b) natural ventilation based on thermal effects is very sensitive to wind disturbance; (c) the greenhouse length and/or width form a limiting factor(s); and (d) it is a complicated task to control such a system.
Scientific Publication
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