Theoretical Analysis for Heat Transfer Optimization in Subcritical Electrothermal Energy Storage Systems

Peng Hu, Gao-Wei Zhang, Long-Xiang Chen and Ming-Hou Liu
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Peng Hu: Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China
Gao-Wei Zhang: Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China
Long-Xiang Chen: Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Jinjiang 362200, China
Ming-Hou Liu: Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China

Energies, 2017, vol. 10, issue 2, 1-15

Abstract: Electrothermal energy storage (ETES) provides bulk electricity storage based on heat pump and heat engine technologies. A subcritical ETES is described in this paper. Based on the extremum principle of entransy dissipation, a geometry model is developed for heat transfer optimization for subcritical ETES. The exergy during the heat transfer process is deduced in terms of entropy production. The geometry model is validated by the extremum principle of entropy production. The theoretical analysis results show that the extremum principle of entransy dissipation is an effective criterion for the optimization, and the optimum heat transfer for different cases with the same mass flux or pressure has been discussed. The optimum heat transfer can be achieved by adjusting the mass flux and pressure of the working fluid. It also reveals that with the increase of mass flux, there is a minimum exergy in the range under consideration, and the exergy decreases with the increase of the pressure.

Keywords: heat exchanger; optimum heat transfer; entransy dissipation; entropy production; exergy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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