4.8 Article

Entropy generation minimization for charging and discharging processes in a gas-hydrate cool storage system

Journal

APPLIED ENERGY
Volume 87, Issue 4, Pages 1149-1157

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2009.07.020

Keywords

Cool storage system; Gas hydrate; Phase change ratio; Charging and discharging processes; Entropy generation minimization; Thermodynamic optimization

Funding

  1. Beijing Municipal Commission of Education [KM200710005034]
  2. Beijing Municipality Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering
  3. National Natural Science Foundation of PR China [59836232]

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Thermodynamic optimization models of gas-hydrate cool storage and cool release processes are established in this paper. The optimal temperature configuration at the sensible heat transfer stage and the optimal gas hydrate phase change rate configuration at the phase change stage in the processes of gas hydrate charging and discharging are obtained by taking entropy generation minimization as optimization objective. The optimal control strategies of the cool storage system are determined. The research results indicate that the optimal operating characteristic of the gas-hydrate cool storage system can be achieved by keeping the phase change rates uniform, which are regulated and controlled according to constant heat transfer rates in the charging and discharging processes of gas hydrate. The analysis method and the results presented in this paper can provide important guidelines for optimal design and operation of gas-hydrate cool storage system. (C) 2009 Elsevier Ltd. All rights reserved.

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