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פותח על ידי קלירמאש פתרונות בע"מ -
A mixing-length model of screenhouse ventilation: Momentum and energy fluxes
Year:
2018
Source of publication :
Acta Horticulturae
Authors :
טייטל, מאיר
;
.
טנאי, יוסף
;
.
כהן, שבתאי
;
.
לוקיאנוב, ויקטור
;
.
ניימן, מיכאל
;
.
Volume :
1227
Co-Authors:

Seginer, I., Technion, Haifa, Israel;

Facilitators :
From page:
241
To page:
248
(
Total pages:
8
)
Abstract:

Screenhouses have recently increased in size to an extent (several ha) that justifies modeling them as infinite structures. Accordingly, a one-dimensional mixing-length model was developed to predict vertical momentum and energy fluxes in flat-roof screenhouses. A further simplifying feature of the model is to treat solar and terrestrial radiation together as a single flux (of net radiation). Data were collected around noon in a large banana screenhouse. Momentum, sensible heat and latent heat flux profiles were determined by eddy covariance, and the flux Bowen ratio was used to close the energy balance. All flux profiles showed the characteristics expected of an infinite screenhouse, in particular, constant fluxes above the screen and discontinuities of net radiation, sensible heat and momentum across the screen. Parameter values extracted by fitting observations to the model include mixing lengths, drag coefficients and extinction coefficients of canopy and screen. © 2018 International Society for Horticultural Science. All Rights Reserved.

Note:
Related Files :
Energy profiles
Mixing-length model
momentum
screenhouse
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
39150
Last updated date:
02/03/2022 17:27
Creation date:
30/01/2019 12:15
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Scientific Publication
A mixing-length model of screenhouse ventilation: Momentum and energy fluxes
1227

Seginer, I., Technion, Haifa, Israel;

A mixing-length model of screenhouse ventilation: Momentum and energy fluxes

Screenhouses have recently increased in size to an extent (several ha) that justifies modeling them as infinite structures. Accordingly, a one-dimensional mixing-length model was developed to predict vertical momentum and energy fluxes in flat-roof screenhouses. A further simplifying feature of the model is to treat solar and terrestrial radiation together as a single flux (of net radiation). Data were collected around noon in a large banana screenhouse. Momentum, sensible heat and latent heat flux profiles were determined by eddy covariance, and the flux Bowen ratio was used to close the energy balance. All flux profiles showed the characteristics expected of an infinite screenhouse, in particular, constant fluxes above the screen and discontinuities of net radiation, sensible heat and momentum across the screen. Parameter values extracted by fitting observations to the model include mixing lengths, drag coefficients and extinction coefficients of canopy and screen. © 2018 International Society for Horticultural Science. All Rights Reserved.

Scientific Publication
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