Pin-fins are considered as one of the best elements for heat transfer enhancement in heat exchangers. In this study, the topology of pin-fins (length, diameter, and shape) is optimized based on the entropy generation minimization (EGM) theory coupled with the constructal law (CL). Such pin-fins are employed in a heat exchanger in a sensible thermal energy storage (TES) system so as to enhance the rate of heat transfer. First, the EGM method is used to obtain the optimal length of pin-fins, and then the CL is applied to get the optimal diameter and shape of pin-fins. Reliable computational fluid dynamics (CFD) simulations of various constructal pin-fin models are performed, and detailed flow and heat transfer characteristics are presented. The results show that by using the proposed system with optimized pin-fin heat exchanger the stored thermal energy can be increased by 10.2%.
Optimization of Pin-Fins for a Heat Exchanger by Entropy Generation Minimization and Constructal Law
and Aerospace Computing (ESAC),
School of Mechanical Engineering,
P.O. Box 552,
Department of Industrial Engineering,
Parco Area delle Scienze, 181A,
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 22, 2014; final manuscript received June 25, 2014; published online March 17, 2015. Assoc. Editor: Cesare Biserni.
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Xie, G., Song, Y., Asadi, M., and Lorenzini, G. (June 1, 2015). "Optimization of Pin-Fins for a Heat Exchanger by Entropy Generation Minimization and Constructal Law." ASME. J. Heat Transfer. June 2015; 137(6): 061901. https://doi.org/10.1115/1.4029851
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