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פותח על ידי קלירמאש פתרונות בע"מ -
A study of the overall heat transfer coefficient of greenhouse cladding materials with thermal screens using the hot box method
Year:
2009
Source of publication :
Polymer Testing
Authors :
לוי, אהרון
;
.
קשתי, יוסי
;
.
Volume :
28
Co-Authors:
Geoola, F., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Kashti, Y., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Levi, A., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Brickman, R., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Facilitators :
From page:
470
To page:
474
(
Total pages:
5
)
Abstract:
A laboratory guarded hot box was designed and constructed to investigate the overall heat transfer coefficient, U (W m-2 K-1), of different greenhouse polyethylene plastic films with or without thermal screens. Tests were made on plastic films, in both dry and wet (in the presence of condensation) states, with or without thermal screens, as functions of wind velocity and temperature difference. It was found that the overall heat transfer coefficient U increases with increase in temperature difference. For a given temperature difference, the U value increases as the wind velocity increases. The condensation phenomena favored the plastic film, since its U value was always less than that of the corresponding dry film. It was found that using a thermal screen would reduce the U value by about 30%, an energy saving of about 30%. © 2009 Elsevier Ltd. All rights reserved.
Note:
Related Files :
A-thermal
Cladding material
greenhouses
Overall heat transfer coefficient
Plastic films
Temperature differences
U value
Wind velocities
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.polymertesting.2009.02.006
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23005
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:56
Scientific Publication
A study of the overall heat transfer coefficient of greenhouse cladding materials with thermal screens using the hot box method
28
Geoola, F., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Kashti, Y., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Levi, A., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Brickman, R., Institute of Agricultural Engineering, ARO, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
A study of the overall heat transfer coefficient of greenhouse cladding materials with thermal screens using the hot box method
A laboratory guarded hot box was designed and constructed to investigate the overall heat transfer coefficient, U (W m-2 K-1), of different greenhouse polyethylene plastic films with or without thermal screens. Tests were made on plastic films, in both dry and wet (in the presence of condensation) states, with or without thermal screens, as functions of wind velocity and temperature difference. It was found that the overall heat transfer coefficient U increases with increase in temperature difference. For a given temperature difference, the U value increases as the wind velocity increases. The condensation phenomena favored the plastic film, since its U value was always less than that of the corresponding dry film. It was found that using a thermal screen would reduce the U value by about 30%, an energy saving of about 30%. © 2009 Elsevier Ltd. All rights reserved.
Scientific Publication
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