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Optimal design and dispatch of phosphoric acid fuel cell hybrid system with direct heat recovery through coupled calculation and artificial intelligence-based optimization

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  • Kim, Hyerim
  • Kim, Tong Seop

Abstract

A phosphoric acid fuel cell (PAFC) is the first-generation of modern fuel cells that can use waste heat in various ways. This study presents a PAFC hybrid system with direct heat recovery. Direct heat recovery uses PAFC cooling water as the working fluid for the steam turbine, simplifying the system and improving performance. The PAFC in this hybrid system acts as a power generator and evaporator. The hybrid system operates in power generation mode (mode_pg) and combined heat and power mode (mode_chp). The overall behavior of the hybrid system was analyzed using a coupled calculation method. Under mode_pg, the electric power and efficiency of the hybrid system were 37.0 % and 10.5 % higher, respectively, than those of a conventional system. The thermal power and CHP efficiency in mode_chp were 35.7 % and 8.8%p higher, respectively, than those of a conventional system. The optimal dispatch was obtained using an artificial intelligence-based optimization framework that considered two scenarios. As a result, the optimal demand was 25.8 % higher when the hybrid system with the optimal dispatch was used. In addition, the economic and environmental indices were 7.3 % and 6.8 % lower, respectively, than the conventional system, highlighting the feasibility and eco-friendliness of the hybrid system.

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  • Kim, Hyerim & Kim, Tong Seop, 2024. "Optimal design and dispatch of phosphoric acid fuel cell hybrid system with direct heat recovery through coupled calculation and artificial intelligence-based optimization," Energy, Elsevier, vol. 312(C).
    • Handle: RePEc:eee:energy:v:312:y:2024:i:c:s0360544224032201
    DOI: 10.1016/j.energy.2024.133444
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