System dynamics and metrics of an electrochemical refrigerator based on the Brayton cycle

Rajan, Aravindh; Yee, Shannon K.

doi:10.1016/j.xcrp.2022.100774

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…The EBC is more feasible than TREC because the isothermal processes require good heat transfer performance of reactors [11]. In the previous study, the authors preliminarily investigated the performance of the EBC systems based on a two-dimensional model coupling mass transfer and electrode kinetics, showing that the performance of EBC was very promising to compete with existing TRECs, especially in terms of thermal efficiency [12].…”

Section: Fig 1 Schematic Of the Ebc Systemmentioning

confidence: 99%

The energy storage/release density and net energy density of the electrochemical Brayton cycle: A thermodynamic derivation

Chen,

Xu,

Deng

et al. 2024

Preprint

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The power density and thermal efficiency of the electrochemical Brayton cycle (EBC) have been addressed through the conservation of energy. However, it remains a gap to determine the energy density of charging and discharging processes, a crucial aspect tied to energy storage/release density in EBC systems with integrated energy storage. This study derives the energy storage/release density and net energy density of the ideal EBC system, confirming key parameters including the change in state of charge ΔSOC and the dimensionless figure of merit αqv/cv (α: temperature coefficient, qv: specific charge, cv: specific heat) are confirmed. The theoretical energy storage/ release density approximates 10 W h L -1 , and the net energy density is expected to reach 1.0 W h L -1 . This study provides a valuable framework for assessing the energy storage performance of EBC systems.

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Section: Fig 1 Schematic Of the Ebc Systemmentioning

confidence: 99%

The energy storage/release density and net energy density of the electrochemical Brayton cycle: A thermodynamic derivation

Chen,

Xu,

Deng

et al. 2024

Preprint

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“…The efficiency of these conversions is dependent on the Seebeck temperature coefficient (α), which is proportional to the molar entropy (Δ S ) of the system: a larger Δ S of the redox couple leads to a larger temperature change per mole of electrons transferred. These electrochemical heat engines can be used to harvest waste heat from thermal energy generation, − and electrochemical refrigerators provide a cooling method that can avoid the use of volatile coolants, − which can contribute to atmospheric pollution (hydrofluorocarbons, currently the most common coolant in vapor compression systems, have a global warming potential of up to 2000 times that of CO 2 when leaked). , To improve the efficiency of TRECs, an electrolyte with a large and reversible entropic change is required . So far, most TRECs have used simple salts as electrolytes, relying on electrochemical changes in solvation entropy, with ferri/ferrocyanide (FCN 4–/3– ) being the most promising choice.…”

Section: Introductionmentioning

confidence: 99%

Tunable Electrochemical Entropy through Solvent Ordering by a Supramolecular Host

Xia,

Rajan,

Surendranath

et al. 2023

J. Am. Chem. Soc.

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An aqueous electrochemically controlled host− guest encapsulation system demonstrates a large and synthetically tunable redox entropy change. Electrochemical entropy is the basis for thermally regenerative electrochemical cycles (TRECs), which utilize reversible electrochemical processes with large molar entropy changes for thermogalvanic waste-heat harvesting and electrochemical cooling, among other potential applications. A supramolecular host−guest system demonstrates a molar entropy change of 4 times that of the state-of-the-art aqueous TREC electrolyte potassium ferricyanide. Upon encapsulation of a guest, water molecules that structurally resemble amorphous ice are displaced from the host cavity, leveraging a change in the degrees of freedom and ordering of the solvent rather than the solvation of the redox-active species to increase entropy. The synthetic tunability of the host allows rational optimization of the system's ΔS, showing a range of −51 to −101 cal mol −1 K −1 (−2.2 to −4.4 mV K −1 ) depending on ligand and metal vertex modifications, demonstrating the potential for rational design of high-entropy electrolytes and a new strategy to overcome theoretical limits on ion solvation reorganization entropy.

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Thermo-electrochemical modeling of thermally regenerative flow batteries

Cai,

Qian,

et al. 2024

Applied Energy

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System dynamics and metrics of an electrochemical refrigerator based on the Brayton cycle

Cited by 6 publications

References 22 publications

The energy storage/release density and net energy density of the electrochemical Brayton cycle: A thermodynamic derivation

The energy storage/release density and net energy density of the electrochemical Brayton cycle: A thermodynamic derivation

Tunable Electrochemical Entropy through Solvent Ordering by a Supramolecular Host

Thermo-electrochemical modeling of thermally regenerative flow batteries

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