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A platform for research: civil engineering, architecture and urbanism
Heating of Cold Wall with Confluent Jets in Large Space Enclosures: Application in Greenhouse Premises
A parametrical investigation has been carried out to explore the velocity and temperature behaviour of wall confluent jets (WCJ) when used to heat and ventilate a test room, which mimics a greenhouse. This study assessed how the outdoor air temperature and supply air temperature affect the velocity and temperature profiles of the WCJ. The study also evaluated how WCJ can be used to eliminate film-wise condensation on greenhouse enclosure surfaces. Constant current anemometers (CCA) and T-type thermocouples were used to measure air velocity and temperature of the WCJ, air and surface temperature in the cooling chamber and test room. This study found that the supply air temperature affects the magnitude of the WCJ’s temperature in each region but the pattern (shape) of the dimensionless temperature is unaffected. The study also showed that both magnitude and pattern of the dimensionless temperature profiles are unaffected by the outdoor air temperature in all regions of the WCJ. The dimensionless velocity profiles under isothermal and non-isothermal were similar, but the magnitude of the profiles increased as the supply air temperature increased in the merging and impinging regions of the WCJ. WCJ formed a boundary layer of warm fluid on the nearby wall; thus, can be used to reduce condensation on the inner surfaces of the greenhouse enclosure.
Heating of Cold Wall with Confluent Jets in Large Space Enclosures: Application in Greenhouse Premises
A parametrical investigation has been carried out to explore the velocity and temperature behaviour of wall confluent jets (WCJ) when used to heat and ventilate a test room, which mimics a greenhouse. This study assessed how the outdoor air temperature and supply air temperature affect the velocity and temperature profiles of the WCJ. The study also evaluated how WCJ can be used to eliminate film-wise condensation on greenhouse enclosure surfaces. Constant current anemometers (CCA) and T-type thermocouples were used to measure air velocity and temperature of the WCJ, air and surface temperature in the cooling chamber and test room. This study found that the supply air temperature affects the magnitude of the WCJ’s temperature in each region but the pattern (shape) of the dimensionless temperature is unaffected. The study also showed that both magnitude and pattern of the dimensionless temperature profiles are unaffected by the outdoor air temperature in all regions of the WCJ. The dimensionless velocity profiles under isothermal and non-isothermal were similar, but the magnitude of the profiles increased as the supply air temperature increased in the merging and impinging regions of the WCJ. WCJ formed a boundary layer of warm fluid on the nearby wall; thus, can be used to reduce condensation on the inner surfaces of the greenhouse enclosure.
Heating of Cold Wall with Confluent Jets in Large Space Enclosures: Application in Greenhouse Premises
Environ Sci Eng
Wang, Liangzhu Leon (editor) / Ge, Hua (editor) / Zhai, Zhiqiang John (editor) / Qi, Dahai (editor) / Ouf, Mohamed (editor) / Sun, Chanjuan (editor) / Wang, Dengjia (editor) / Choonya, Gasper (author) / Larsson, Ulf (author) / Moshfegh, Bahram (author)
International Conference on Building Energy and Environment ; 2022
Proceedings of the 5th International Conference on Building Energy and Environment ; Chapter: 202 ; 1925-1933
2023-09-05
9 pages
Article/Chapter (Book)
Electronic Resource
English
Experimental study , Parametric study , Wall confluent jets , Greenhouse heating and ventilation system , Constant current anemometers Engineering , Building Physics, HVAC , Fire Science, Hazard Control, Building Safety , Sustainable Architecture/Green Buildings , Renewable and Green Energy , Environment, general
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