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Experimental study of thermal performance improvement of a solar air flat plate collector through the use of obstacles: application for the drying of ‘yellow onion’
Author(s) -
AhmedZaid A.,
Messaoudi H.,
Abenne A.,
Le Ray M.,
Desmons J. Y.,
Abed B.
Publication year - 1999
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/(sici)1099-114x(19991010)23:12<1083::aid-er498>3.0.co;2-y
Subject(s) - thermal , nanofluids in solar collectors , heat exchanger , thermal efficiency , solar energy , photovoltaic thermal hybrid solar collector , thermal energy , mechanical engineering , process engineering , nuclear engineering , engineering , meteorology , materials science , chemistry , thermodynamics , electrical engineering , physics , organic chemistry , combustion
In the solar air flat plate collector, the insufficiency of the thermal exchange between the fluid and the absorber obliges the user to enhance their optimization. This low thermal exchange does not allow these systems to obtain their best performance or the best thermal efficiency. In our experimental study, which consists of a solar energy simulation, we have sought to improve the efficiency–temperature rise couple of the flat plate solar collector by considering several types of obstacles disposed in rows in the dynamic air vein of the collector. Thus, we have proceeded to the application of the best two systems (WDL1 and TL) for drying an agricultural product (Yellow Onion). By comparing with the collector without obstacles (WO), the thermal transfers and, consequently, the output temperature ( T OC ) and the collector efficiency ( η ) are clearly improved. The drying times obtained with the proposed systems are very interesting. The heat quantities obtained in the case of WDL1 are very important compared with the collector WO. However, the entry to the drying cupboard of this high temperature ( T OC ) in the vicinity of the solar midday must be limited to the maximal value demanded by the considered product. Copyright © 1999 John Wiley & Sons, Ltd.