An ASPEN Plus based model is presented for an intermediate-temperature solid oxide iron–air redox
battery (IT-SOIARB) system. The model shows that the energy efficiency of the system can be as high as
83%. Furthermore, the model is used to determine the factors that affect the energy efficiency of the
battery. With air as the working
fluid, a heat exchanger and thermal storage unit are included in the
battery system to utilize effectively the heat generated from the discharge cycle in the charge cycle. The
results show that air utilization (or air mass
flow rate) plays a key role in regulating heat
flow between the
battery components.