Convective heat transfer enhancement can significantly improve the thermal efficiency in the conversion, utilization, recovery and storage of energy (in particular solar thermal). Modifying velocity field is the most direct approach to enhance convective heat transfer. However, in most cases the optimal velocity field is unknown and difficult to find even for an experienced researcher. In this paper, a predictive optimization methodology in convective heat transfer enhancement based on minimum entropy generation (MEG) principle was developed. A set of Euler’s equations were derived by the variation calculus to the Lagrange function established by governing equations, specific constraints and objective functional—total entropy generation rate. The solution of these equations resulted in the optimal velocity fields, leading to the minimum entropy generation. To validate and demonstrate the future application of this methodology to solar absorbers used to convert concentrated solar energy, the steady laminar convection heat transfer process in a two-dimensional channel with fixed heat flux boundaries was optimized for given total viscous dissipations. The numerical simulation results showed that lower value of maximum wall temperature was obtained by MEG optimization, which means cheaper and safer materials. The present work indicated that the new methodology could be a good guide in convective heat transfer enhancement design work, especially in CSP receivers.
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ASME 2011 5th International Conference on Energy Sustainability
August 7–10, 2011
Washington, DC, USA
Conference Sponsors:
- Advanced Energy Systems Division and Solar Energy Division
ISBN:
978-0-7918-5468-6
PROCEEDINGS PAPER
Convective Heat Transfer Enhancement in Solar Receivers Using Minimum Entropy Generation Optimization Available to Purchase
Qi Li,
Qi Li
Tianjin University, Tianjin, China; CNRS-PROMES, Odeillo Font-Romeu, France
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Xigang Yuan,
Xigang Yuan
Tianjin University, Tianjin, China
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Pierre Neveu,
Pierre Neveu
CNRS-PROMES; University of Perpignan, Perpignan, France
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Gilles Flamant
Gilles Flamant
CNRS-PROMES, Odeillo Font-Romeu, France
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Qi Li
Tianjin University, Tianjin, China; CNRS-PROMES, Odeillo Font-Romeu, France
Xigang Yuan
Tianjin University, Tianjin, China
Pierre Neveu
CNRS-PROMES; University of Perpignan, Perpignan, France
Gilles Flamant
CNRS-PROMES, Odeillo Font-Romeu, France
Paper No:
ES2011-54209, pp. 1967-1976; 10 pages
Published Online:
March 13, 2012
Citation
Li, Q, Yuan, X, Neveu, P, & Flamant, G. "Convective Heat Transfer Enhancement in Solar Receivers Using Minimum Entropy Generation Optimization." Proceedings of the ASME 2011 5th International Conference on Energy Sustainability. ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C. Washington, DC, USA. August 7–10, 2011. pp. 1967-1976. ASME. https://doi.org/10.1115/ES2011-54209
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