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פותח על ידי קלירמאש פתרונות בע"מ -
Buoyancy-driven ventilation in a greenhouse cooled by a fogging system
Year:
2000
Source of publication :
Acta Horticulturae
Authors :
ארבל, אברהם
;
.
ברק, מוטי
;
.
שקליאר, אלכסנדר
;
.
Volume :
534
Co-Authors:
Arbel, A., Institute of Agricultural Engineering, Agricultural Research Organization, Bet-Dagan 50250, Israel
Shklyar, A., Institute of Agricultural Engineering, Agricultural Research Organization, Bet-Dagan 50250, Israel
Barak, M., Institute of Agricultural Engineering, Agricultural Research Organization, Bet-Dagan 50250, Israel
Facilitators :
From page:
327
To page:
334
(
Total pages:
8
)
Abstract:
A theoretical study was conducted to evaluate an evaporative cooling system for greenhouses in the following set-up: (a) evaporative cooling by installing uniformly distributed fogging nozzles in the space over the plant canopy; and (b) natural ventilation based on thermal effect using uniformly installed openings on the roof and on lower part of the side walls of the greenhouse. In accordance with this setup, a computer model was established in order to calculate the required ventilation opening area (on the roof and the side walls) as related to the desired conditions inside the greenhouse and to the ambient conditions. Usually, differences in temperature between inside and outside the greenhouse are used for calculating the required openings area. This computer model, however, is based on the difference in air density between inside and outside the greenhouse. Results indicate that the use of temperature difference can lead to a significant error in ventilation design. This error increases as the temperature difference decreases and the relative humidity difference increases.
Note:
Related Files :
Buoyancy
Evaporative cooling
Fog
greenhouse
Ventilation
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר מתוך כינוס
;
.
Language:
אנגלית
Editors' remarks:
ID:
29757
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:49
Scientific Publication
Buoyancy-driven ventilation in a greenhouse cooled by a fogging system
534
Arbel, A., Institute of Agricultural Engineering, Agricultural Research Organization, Bet-Dagan 50250, Israel
Shklyar, A., Institute of Agricultural Engineering, Agricultural Research Organization, Bet-Dagan 50250, Israel
Barak, M., Institute of Agricultural Engineering, Agricultural Research Organization, Bet-Dagan 50250, Israel
Buoyancy-driven ventilation in a greenhouse cooled by a fogging system
A theoretical study was conducted to evaluate an evaporative cooling system for greenhouses in the following set-up: (a) evaporative cooling by installing uniformly distributed fogging nozzles in the space over the plant canopy; and (b) natural ventilation based on thermal effect using uniformly installed openings on the roof and on lower part of the side walls of the greenhouse. In accordance with this setup, a computer model was established in order to calculate the required ventilation opening area (on the roof and the side walls) as related to the desired conditions inside the greenhouse and to the ambient conditions. Usually, differences in temperature between inside and outside the greenhouse are used for calculating the required openings area. This computer model, however, is based on the difference in air density between inside and outside the greenhouse. Results indicate that the use of temperature difference can lead to a significant error in ventilation design. This error increases as the temperature difference decreases and the relative humidity difference increases.
Scientific Publication
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