The switch to a completely renewable energy ecosystem is not complete without an intermediary between the energy generation and energy consumption side of the ecosystem. Electrochemical energy conversion devices such as fuel cells and electrolysis cells are a good candidate for this purpose A reversible solid oxide cell (ReSOC) is a high-temperature electrochemical cell that can store and generate electricity through the chemical conversion of gases such as steam, hydrogen, methane, carbon monoxide, carbon dioxide, syngas, or a combination of any of these gases. In this study, a reversible solid oxide cell stack was modeled through electrochemical and thermodynamic perspectives. The function of the stack model is to represent the performance of a ReSOC stack within a system. This performance includes re-actant and product gas stream properties, voltage, generated or consumed power, efficiencies (energy, exergy, and roundtrip), exergy destruction rate, etc. In this context, the electrochemical relations are used to model the cell performance (voltage-current density curve) in both the fuel cell and electrolysis mode of operation and the obtained performance curves are validated with experimental data in the literature. The first and second law of thermodynamics is applied to predict and characterize the energetic and exergetic performance of the stack. The variation of the energy and exergy-based performance metrics are investigated through important parameters such as operating temperature, pressure, current density, fuel utilization, and fuel flow rate in both the fuel cell and electrolysis mode of operation.
Anahtar Kelimeler: ReSOC, Modeling, Exergy, Performance analysis