Abstract
To improve the efficiency of the energy conversion, a novel coupling model comprising a solid oxide fuel cell (SOFC), a thermoradiative cell (TRC) with sub-bandgap and non-radiative losses, and a regenerator is proposed. The waste heat from the SOFC is utilized by the TRC to produce extra power. Considering the main irreversible losses inside the coupling model, mathematical expressions for power and efficiency are derived, along with revealing the performance characteristics. Numerical calculation results illustrate that the maximum power output density (MPOD) and corresponding efficiency of the coupled model are 0.94 Wm−2 and 41%, respectively, which are improved by 68% and 14%, respectively, compared to a single SOFC. Furthermore, the influences of parameters such as non-radiative losses, temperature, and bandgap are investigated. The optimal operating regions for power output density, efficiency, and current are determined. Finally, compared with the MPODs of the SOFC-based coupled models, the SOFC-TRC can more effectively utilize the waste heat released from the SOFC. This study may provide some new ideas for the waste heat utilization of SOFC.
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