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קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Air-flow patterns and heat fluxes in roof-ventilated multi-span greenhouse with insect-proof screens
Year:
2004
Authors :
טייטל, מאיר
;
.
Volume :
122
Co-Authors:
Shilo, E., Hebrew University of Jerusalem, Fac. Agric., Food Environ. Qual. S., Seagram Ctr. for Soil and Water Sci., Rehovot 76100, Israel
Teitel, M., Agricultural Engineering Institute, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Mahrer, Y., Hebrew University of Jerusalem, Fac. Agric., Food Environ. Qual. S., Seagram Ctr. for Soil and Water Sci., Rehovot 76100, Israel
Boulard, T., INRA-PSH Avignon, Site Agroparc, 84914, Avignon Cedex 9, France
Facilitators :
From page:
3
To page:
20
(
Total pages:
18
)
Abstract:
Experiments were performed in a semi-commercial, roof-ventilated, four-span greenhouse with insect-proof screens over its openings, to determine the air-flow patterns, heat fluxes and ventilation rates. The ventilation rate in leeward ventilation increased with wind velocity. A comparison between ventilation rates measured by the tracer gas and energy-balance methods showed good correlation between the two. An indication of the influence of outside wind direction on the ventilation rates and air-flow patterns was observed. The direction of air flow within the greenhouse at plant level was nearly opposite to that of the external wind. Both the mean and turbulent latent heat fluxes through the roof openings were much larger than the sensible heat fluxes. Both the sensible and latent turbulent heat fluxes had high values when the roof openings were opened, and then decayed with time. Their directions at the level of the openings were from the greenhouse towards the outside and at plant level they generally followed the direction of the ambient wind. © 2003 Elsevier B.V. All rights reserved.
Note:
Related Files :
Air flow
greenhouse
Heat flux
Insect-proof screens
Insecta
Ventilation, greenhouse ecosystem
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.agrformet.2003.09.007
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
21473
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:44
You may also be interested in
Scientific Publication
Air-flow patterns and heat fluxes in roof-ventilated multi-span greenhouse with insect-proof screens
122
Shilo, E., Hebrew University of Jerusalem, Fac. Agric., Food Environ. Qual. S., Seagram Ctr. for Soil and Water Sci., Rehovot 76100, Israel
Teitel, M., Agricultural Engineering Institute, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Mahrer, Y., Hebrew University of Jerusalem, Fac. Agric., Food Environ. Qual. S., Seagram Ctr. for Soil and Water Sci., Rehovot 76100, Israel
Boulard, T., INRA-PSH Avignon, Site Agroparc, 84914, Avignon Cedex 9, France
Air-flow patterns and heat fluxes in roof-ventilated multi-span greenhouse with insect-proof screens
Experiments were performed in a semi-commercial, roof-ventilated, four-span greenhouse with insect-proof screens over its openings, to determine the air-flow patterns, heat fluxes and ventilation rates. The ventilation rate in leeward ventilation increased with wind velocity. A comparison between ventilation rates measured by the tracer gas and energy-balance methods showed good correlation between the two. An indication of the influence of outside wind direction on the ventilation rates and air-flow patterns was observed. The direction of air flow within the greenhouse at plant level was nearly opposite to that of the external wind. Both the mean and turbulent latent heat fluxes through the roof openings were much larger than the sensible heat fluxes. Both the sensible and latent turbulent heat fluxes had high values when the roof openings were opened, and then decayed with time. Their directions at the level of the openings were from the greenhouse towards the outside and at plant level they generally followed the direction of the ambient wind. © 2003 Elsevier B.V. All rights reserved.
Scientific Publication
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