Electrochemically driven phase transformation for high-efficiency heat pumping

Kim, Junyoung; Mishra, Abhiroop; Braun, James E.; Groll, Eckhard A.; Rodríguez‐López, Joaquín; Ziviani, Davide

doi:10.1016/j.xcrp.2023.101369

Cited by 1 publication

(6 citation statements)

References 26 publications

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“…The low-complexity model of James et al considered only nine molecule pairs, while the more sophisticated models exclusively focused on the IPA pair. − Consequently, our results cannot be directly compared. Even for the IPA pair, comparisons are challenging due to variations in case studies. − The low-complexity model assumed complete reaction within the electrochemical cell and a constant cell efficiency. Compared with this model, our calculations result in lower COPs for most of the molecule pairs.…”

Section: Resultsmentioning

confidence: 94%

“…Previous studies ,− of electrochemical cooling consider models with different model complexity (cf. Table ).…”

Section: Resultsmentioning

confidence: 99%

“…However, the most promising working fluids identified in this study are a good basis for prospective studies that address more detailed models or experiments. James et al 17 James 19 Kim et al 20 Kim et al 21 Kim et al 22 Kim et al 23…”

Section: Discussionmentioning

confidence: 99%

“…Elevated cell temperatures increase the process pressures, subsequently reducing the evaporator's heat uptake. Consecutively, Kim et al 22 showed experimentally for IPA that condensation through composition change in the electrochemical cell is possible. In a recent model-based study, Kim et al 23 evaluated the performance of 13 molecule pairs in an electrochemical cooling process to identify decisive properties for selecting molecule pairs.…”

Section: Introductionmentioning

confidence: 99%

“…The studies mentioned above ,− show that the electrochemical cooling process’ performance is heavily dependent on the employed molecule pair. Assessing the performance capability of molecule pairs requires a certain model complexity.…”

Section: Introductionmentioning

confidence: 99%

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Indirect Electrochemical Cooling: Model-Based Performance Analysis and Working Fluid Selection

Liebl,

Bardow,

Roskosch

2024

Ind. Eng. Chem. Res.

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The rising energy demand for cooling and heating requires efficient and sustainable technologies. Vapor-compression systems represent the state of the art but suffer from downscaling limits and maintenance needs. These disadvantages may be overcome by recently proposed electrochemical processes. However, their potential has not been explored systematically. This work quantifies the thermodynamic potential of an indirect electrochemical cooling process that replaces the vapor compressor of a standard refrigeration cycle with an electrochemical cell. An equilibrium-based process model evaluates the process performance of a working fluid, depending on its composition and temperatures in the process. After screening an extensive database for possible working fluids, an electrochemical cooling process is analyzed and optimized for the coefficient of performance (COP) to operate between two heat reservoirs at 20 °C (heat source) and 35 °C (heat sink). The majority of the investigated working fluids yield smaller or similar efficiencies than vapor-compression refrigeration, with COPs between 3.0 and 4.0. However, 35 promising working fluids that achieve higher efficiencies are identified with a COP up to 9.63, corresponding to 49% of Carnot. These working fluids are worthy of further investigation as their use in the electrochemical cooling process possibly outperforms standard vapor-compression refrigeration.

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