Effect of large temperature difference on drag coefficient and Nusselt number of an ellipsoidal particle in compressible viscous flow

Ruddlesden‐Popper‐type perovskite Sr3Fe2O7−δ for enhanced thermochemical energy storage

“…3 Fe 2 O 7-δ and SrFeO 3-δ is close to each other, but the reduction degree Δδ of Sr 3 Fe 2 O 7-δ has been greatly improved with the value of 0.79, while that of SrFeO 3-δ is only 0.27. And the reduced oxygen release is also greater for Sr 3 Fe 2 O 7-δ , due to the associated oxygen release being 1623.7 and 1410.2 μmol/g, respectively.…”

“…31 The specific heat capacities of Sr 3 Fe 2 O 7-δ and SrFeO 3-δ were measured to be 0.627 and 0.558 J/(g C) at 25 C, thus Sr 3 Fe 2 O 7-δ and SrFeO 3-δ will store a total heat of $363 and 406 kJ/kg in a solar heating process (Figure 8C). The densities of the samples were also measured and corresponding densities of 4.1416 and 4.3548 g/cm 3 were obtained for SrFeO 3-δ and Sr 3 Fe 2 O 7-δ , respectively. The volumetric heat storage density of the layered Sr 3 Fe 2 O 7-δ is 402.51 kg/dm 3 (Figure 8B), which will reduce the number of tanks used to store TCES media by 15.5% compared to SrFeO 3-δ thus reducing the cost.…”

“…To date, due to the intermittency of renewable energy and the characteristic “duck curve” caused by the mismatch between capacity and energy demand, 1,2 an energy storage technology with rapid response and flexible peak regulation without additional environmental pollution in the process of use is attractive. Solar energy is the most abundant renewable energy and solar power generation technology can be divided into photovoltaic (PV) and concentrated solar power (CSP) 3 . CSP can be combined with efficient energy storage system to overcome the discontinuity of solar energy and achieve 24‐h electricity supply 4 …”

“…Solar energy is the most abundant renewable energy and solar power generation technology can be divided into photovoltaic (PV) and concentrated solar power (CSP). 3 CSP can be combined with efficient energy storage system to overcome the discontinuity of solar energy and achieve 24-h electricity supply. 4 Energy storage technologies for CSP can be divided into sensible, latent and thermochemical energy storage, which use temperature change, phase change and chemical reaction of the material to store heat, respectively.…”