Torsional refrigeration by twisted, coiled, and supercoiled fibers

Wang, Run; Fang, Shaoli; Xiao, Yicheng; Gao, Enlai; Jiang, Nan; Li, Yaowang; Mou, Linlin; Shen, Yanan; Zhao, Wubin; Li, Sitong; Fonseca, Alexandre F.; Galvão, Douglas S.; Chen, Mengmeng; He, Wenqian; Yu, Kaiqing; Lu, Hongbing; Wang, Xuemin; Qian, Dong; Aliev, Ali E.; Li, Na; Haines, Carter S.; Liu, Zhong‐Sheng; Mu, Jiuke; Wang, Zhong; Yin, Shougen; Lima, Márcio Dias; An, Baigang; Zhou, Xiang; Liu, Zunfeng; Baughman, Ray H.

doi:10.1126/science.aax6182

Cited by 160 publications

(110 citation statements)

References 40 publications

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“…Solid‐state cooling including electrocaloric (EC) cooling, thermoelectric cooling, and elastocaloric cooling have gained increasing attention for compact cooling where the currently ubiquitous vapor compression cycle technology is too bulky, inefficient, and employs an ozone‐depleting coolant. [ 1–4 ] Among the different solid state cooling technologies, the EC cooling could achieve high cooling Δ T and high coefficient of performance. [ 5–7 ]…”

Section: Figurementioning

confidence: 99%

Self‐Actuating Electrocaloric Cooling Fibers

Wang

Meng

Zhang

et al. 2020

Advanced Energy Materials

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Solid‐state cooling fibers comprising an electrocaloric polymer, poly(vinylidene fluoride‐trifluoroethylene‐chlorofluoroethylene) terpolymer, spray‐coated on a conductive fiber core electrode, and a coaxially coated single‐walled carbon nanotubes outer electrode are reported. The fiber coolers can be less than 160 µm thin and more than 8 cm long. Measured cooling ΔT of the EC fibers is 0.7 °C at an electric field of 100 V µm−1 applied between the electrodes. The fiber coolers are flexible; 2000 cycles of repeated bending to a 2.5 mm curvature radius do not significantly degrade the cooling ΔT. Self‐actuated bending of the fibers is observed during the EC operation, which allows the EC fibers to move heat from one location to another without any additional driving mechanisms such as electromagnetic motors, pumps, or electrostatic actuation that are commonly used in conventional coolers. The self‐actuating EC fibers represent the first ever active cooler in a thin fiber form factor.

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Section: Figurementioning

confidence: 99%

Self‐Actuating Electrocaloric Cooling Fibers

Wang

Meng

Zhang

et al. 2020

Advanced Energy Materials

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“…In general, the active elastocaloric regenerator can be loaded in tension or compression, each of which has some pros and cons concerning the elastocaloric cooling. Although very interesting, other loading modes such as bending [67] or torsion [68] will not be considered here since they cannot provide a homogenous strain distribution over the porous structure. Homogenous strain distribution that results in homogenous distribution of the eCE is the first precondition of an efficient active elastocaloric regenerator.…”

Section: Tension Vs Compressionmentioning

confidence: 99%

Elastocaloric Cooling: State-of-the-art and Future Challenges in Designing Regenerative Elastocaloric Devices

Kabirifar

Žerovnik

Ahčin

et al. 2019

SV-JME

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The elastocaloric cooling, utilizing latent heat associated with martensitic transformation in shape-memory alloys, is being considered in the recent years as one of the most promising alternatives to vapour compression cooling technology. It can be more efficient and completely harmless to the environment and people. In the first part of this work, the basics of the elastocaloric effect (eCE) and the state-of-the-art in the field of elastocaloric materials and devices are presented. In the second part, we are addressing crucial challenges in designing active elastocaloric regenerators, which are currently showing the largest potential for utilization of eCE in practical devices. Another key component of elastocaloric technology is a driver mechanism that needs to provide loading for active elastocaloric regenerators in an efficient way and recover the released energy during their unloading. Different driver mechanisms are reviewed and the work recovery potential is discussed in the third part of this work.

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“…Another type of transitions with caloric effects is offered by mechanocaloric effects, [ 6 ] which can be pronounced in the materials that exhibit high sensitivity to external stress fields, such as a uniaxial stress (the elastocaloric effects, eCE), [ 7,8 ] a hydrostatic pressure (the barocaloric effect, BCE), [ 9–11 ] or a combination of different stresses. [ 12 ]…”

Section: Introductionmentioning

confidence: 99%

Giant and Reversible Barocaloric Effect in Trinuclear Spin‐Crossover Complex Fe₃(bntrz)₆(tcnset)₆

et al. 2021

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A giant barocaloric effect (BCE) in a molecular material Fe3(bntrz)6(tcnset)6 (FBT) is reported, where bntrz = 4‐(benzyl)‐1,2,4‐triazole and tcnset = 1,1,3,3‐tetracyano‐2‐thioethylepropenide. The crystal structure of FBT contains a trinuclear transition metal complex that undergoes an abrupt spin‐state switching between the state in which all three FeII centers are in the high‐spin (S = 2) electronic configuration and the state in which all of them are in the low‐spin (S = 0) configuration. Despite the strongly cooperative nature of the spin transition, it proceeds with a negligible hysteresis and a large volumetric change, suggesting that FBT should be a good candidate for producing a large BCE. Powder X‐ray diffraction and calorimetry reveal that the material is highly susceptible to applied pressure, as the transition temperature spans the range from 318 at ambient pressure to 383 K at 2.6 kbar. Despite the large shift in the spin‐transition temperature, its nonhysteretic character is maintained under applied pressure. Such behavior leads to a remarkably large and reversible BCE, characterized by an isothermal entropy change of 120 J kg−1 K−1 and an adiabatic temperature change of 35 K, which are among the highest reversible values reported for any caloric material thus far.

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Torsional refrigeration by twisted, coiled, and supercoiled fibers

Cited by 160 publications

References 40 publications

Self‐Actuating Electrocaloric Cooling Fibers

Self‐Actuating Electrocaloric Cooling Fibers

Elastocaloric Cooling: State-of-the-art and Future Challenges in Designing Regenerative Elastocaloric Devices

Giant and Reversible Barocaloric Effect in Trinuclear Spin‐Crossover Complex Fe₃(bntrz)₆(tcnset)₆

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Torsional refrigeration by twisted, coiled, and supercoiled fibers

Cited by 160 publications

References 40 publications

Self‐Actuating Electrocaloric Cooling Fibers

Self‐Actuating Electrocaloric Cooling Fibers

Elastocaloric Cooling: State-of-the-art and Future Challenges in Designing Regenerative Elastocaloric Devices

Giant and Reversible Barocaloric Effect in Trinuclear Spin‐Crossover Complex Fe3(bntrz)6(tcnset)6

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Product

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Giant and Reversible Barocaloric Effect in Trinuclear Spin‐Crossover Complex Fe₃(bntrz)₆(tcnset)₆