Concept design and numerical evaluation of a highly efficient rotary electrocaloric refrigeration device

Li, Qiang; Shi, Junye; Han, Donglin; Du, Feihong; Chen, Jiangping; Qian, Xiaoshi

doi:10.1016/j.applthermaleng.2021.116806

Cited by 15 publications

(4 citation statements)

References 43 publications

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“…The simulation parameters were obtained based on the experimental results mentioned previously. Referring to the previous study 67 , deionized water was selected as the heat transfer fluid. The detailed working principles, system structures, initial and boundary conditions, and other information are presented in Supplementary Section 3 .…”

Section: Resultsmentioning

confidence: 99%

Low-k nano-dielectrics facilitate electric-field induced phase transition in high-k ferroelectric polymers for sustainable electrocaloric refrigeration

Li,

Wei,

Zhong

et al. 2024

Nat Commun

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Ferroelectric polymer-based electrocaloric effect may lead to sustainable heat pumps and refrigeration owing to the large electrocaloric-induced entropy changes, flexible, lightweight and zero-global warming potential. Herein, low-k nanodiamonds are served as extrinsic dielectric fillers to fabricate polymeric nanocomposites for electrocaloric refrigeration. As low-k nanofillers are naturally polar-inactive, hence they have been widely applied for consolidate electrical stability in dielectrics. Interestingly, we observe that the nanodiamonds markedly enhances the electrocaloric effect in relaxor ferroelectrics. Compared with their high-k counterparts that have been extensively studied in the field of electrocaloric nanocomposites, the nanodiamonds introduces the highest volumetric electrocaloric enhancement (~23%/vol%). The resulting polymeric nanocomposite exhibits concurrently improved electrocaloric effect (160%), thermal conductivity (175%) and electrical stability (125%), which allow a fluid-solid coupling-based electrocaloric refrigerator to exhibit an improved coefficient of performance from 0.8 to 5.3 (660%) while maintaining high cooling power (over 240 W) at a temperature span of 10 K.

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Section: Resultsmentioning

confidence: 99%

Low-k nano-dielectrics facilitate electric-field induced phase transition in high-k ferroelectric polymers for sustainable electrocaloric refrigeration

Li,

Wei,

Zhong

et al. 2024

Nat Commun

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“…Another advantage of EC refrigeration technology is the simplicity of its electricity-driving method. The electric field not only reorients the electric dipole in the dielectric materials by introducing the phase transitions in such materials [9] . In other words, electric field leads to hot and cold changes in certain dielectric materials.…”

Section: (2023) 012016mentioning

confidence: 99%

Highly efficient electrocaloric device based on composite materials with excellent heat transfer performance

Han

et al. 2023

J. Phys.: Conf. Ser.

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Electrocaloric (EC) cooling technology is known for its efficiency and simplicity of the electricity-driving method. However, there still are many challenges and problems, i.e., the poor heat transfer of EC materials (polymers), and the limited electrocaloric temperature change, which result in the limited cooling efficiency and/or cooling power of the EC cooling prototypes. The lack of EC device with high cooling performance poses challenging obstacles for the industrial deployment of the EC cooling technology. In this work, we demonstrated that the fabrication of P(VDF-TrFE-CFE) nanocomposites with BaZr0.2Ti0.8O3 (BZT) particles is an efficient way to improve the heat transfer of EC materials without compromising EC capability. In order to valid the positive effect of developing the EC device rather than provide a pure material study, we developed a solid-fluid coupling EC cooling machine numerically. The introduction of BZT composites allows EC refrigeration devices to exhibit a good COP while maintaining a relatively high total cooling power (>150 W) when the temperature span is 10 K. Therefore, the composites exhibit great potential of ECE for future cooling applications.

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“…Shortly after, the same team presented a complementary outcome of their rotatory electrocaloric refrigeration device. [ 90 ] This time, the target was to come up with compact and efficient devices for cooling applications where size and weight are the main priority. Hence, the rotary EC cylinder had an inner diameter of 4 mm, an outer diameter of 11.1 mm, and a height of 50 mm, and was evenly divided into two parts.…”

Section: Numerical Modelsmentioning

confidence: 99%

Electrocaloric Coolers: A Review

Torelló

Defaÿ

2022

Adv Elect Materials

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Since the discovery of giant electrocaloric effects, researchers are intensively studying electrocaloric cooling as an alternative to vapor compression systems to develop more efficient heat pumps and mitigate climate change. Endorsed by its direct use of electricity, easy‐handling, and compact design, recent advancements in the performance of electrocaloric coolers have finally displayed temperatures comparable to similar competing technologies, and the topic has regained attention and interest. In this work, the design, performance, and working principles of all electrocaloric prototypes before the year 2021 are reviewed, and hints and guidelines are given for future works to bring the development of these devices one step closer to real applications.

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Concept design and numerical evaluation of a highly efficient rotary electrocaloric refrigeration device

Cited by 15 publications

References 43 publications

Low-k nano-dielectrics facilitate electric-field induced phase transition in high-k ferroelectric polymers for sustainable electrocaloric refrigeration

Low-k nano-dielectrics facilitate electric-field induced phase transition in high-k ferroelectric polymers for sustainable electrocaloric refrigeration

Highly efficient electrocaloric device based on composite materials with excellent heat transfer performance

Electrocaloric Coolers: A Review

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