Experimental analysis and exergetic assessment of the solar air collector with delta winglet vortex generators and baffles

Autor: Ali Sari, Meisam Sadi, Mohammad Mohammadiun, Hamid Mohammadiun, Ghobad Shafiei Sabet
Rok vydání: 2020
Předmět:
Zdroj: Journal of Thermal Analysis and Calorimetry. 145:867-885
ISSN: 1588-2926
1388-6150
DOI: 10.1007/s10973-020-10298-6
Popis: To increase the efficiency of solar air collectors (SACs), the combined effects of baffles and delta winglet vortex generator (DWLVG) on the performance of SAC have been investigated. An experimental setup has been made, and numerical simulation is carried out in Ansys Fluent. The numerical investigation is validated by the experimental study and focused on the number of baffles as well as the number and the height of DWLVG. The results show that the SAC with no baffles and DWLVG has the lowest efficiency with the maximum value of 13%, while for SAC with six baffles and three pairs of DWLVG, the efficiency reaches up to 20%. The exergy analysis of three cases, SAC without baffles and DWLVG, SAC with six baffles without DWLVG, and SAC with six baffles and three pairs of DWLVG, shows that the maximum exergy efficiency of the SAC is 30.44% and occurs when the height ratio and the number of DWLVG pairs are 0.5 and 3. The results show that for SAC with six baffles and three pairs of DWLVG, the energy and exergy efficiency improve 7.4% and 12% on an average basis compared to the typical flat plate SAC, respectively. This improvement in thermal and exergy efficiency is due to the implementation of DWLVG which produces more turbulence and eliminates the vortices generated at the corners of SAC.
Databáze: OpenAIRE
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