נגישות
menu      
Advanced Search
Syntax
Search...
Volcani treasures
About
Terms of use
Manage
Community:
אסיף מאגר המחקר החקלאי
Powered by ClearMash Solutions Ltd -
Heat Transfer Coefficients of Layers of Greenhouse Thermal Screens
Year:
2022
Authors :
Barak, Moti
;
.
Haslavsky, Vitaly
;
.
Vitoshkin, Helena
;
.
Volume :
Co-Authors:

Vitaly Haslavsky
Helena Vitoshkin
Mordehai Barak
Avraham Arbel

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

The total energy saving effect of different types of greenhouse thermal/shade screens was determined by measuring and calculating the overall heat transfer coefficients (U-values) for single and several layers of screens. The measurements were carried out using the hot box method and the calculations were performed according to the ISO Standard 15099. The goal was to examine different types of materials with a wide range of thermal radiation properties using for thermal screens in combinations with a dehumidification system in order to improve greenhouse insulation. The experimental results were in good agreement with the calculated heat transfer coefficients. It was shown that a high amount of infra-red (IR) radiation can be blocked by the greenhouse covering material in combination with moveable thermal screens. Aluminum foil screen could be replaced by transparent screens, depending on shading requirements. The results indicated that using a single layer, the U-value was reduced by approximately 70% compared to covering material alone, while the contributions of additional screen layers containing aluminum foil strips could reduce the U-value by approximately 90%. It was shown that three screen layers are sufficient for effective insulation.

Note:
Related Files :
Greenhouse insulation
Heat losses
Thermal screen
U-value
Show More
Related Content
More details
DOI :
10.11159/htff22.110
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
Conference paper
;
.
Language:
English
Editors' remarks:
ID:
63185
Last updated date:
11/01/2023 17:10
Creation date:
11/01/2023 17:08
Scientific Publication
Heat Transfer Coefficients of Layers of Greenhouse Thermal Screens

Vitaly Haslavsky
Helena Vitoshkin
Mordehai Barak
Avraham Arbel

Heat Transfer Coefficients of Layers of Greenhouse Thermal Screens

The total energy saving effect of different types of greenhouse thermal/shade screens was determined by measuring and calculating the overall heat transfer coefficients (U-values) for single and several layers of screens. The measurements were carried out using the hot box method and the calculations were performed according to the ISO Standard 15099. The goal was to examine different types of materials with a wide range of thermal radiation properties using for thermal screens in combinations with a dehumidification system in order to improve greenhouse insulation. The experimental results were in good agreement with the calculated heat transfer coefficients. It was shown that a high amount of infra-red (IR) radiation can be blocked by the greenhouse covering material in combination with moveable thermal screens. Aluminum foil screen could be replaced by transparent screens, depending on shading requirements. The results indicated that using a single layer, the U-value was reduced by approximately 70% compared to covering material alone, while the contributions of additional screen layers containing aluminum foil strips could reduce the U-value by approximately 90%. It was shown that three screen layers are sufficient for effective insulation.

Scientific Publication
You may also be interested in