Regenerative cooling using elastocaloric rubber: Analytical model and experiments

Sebald, Gaël; Komiya, Atsuki; Jacques, Jean; Coativy, Gildas; Lebrun, Laurent

doi:10.1063/1.5132361

Cited by 29 publications

(13 citation statements)

References 51 publications

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“…A design based on uniaxial deformation of rubber stripes with a crankshaft was tested, but no cooling effect was achieved due to poor heat transfer and large frictional heating 30 . More recently, a regenerative heat pump was developed 31 , which uses oscillatory stretching of a NR pipe with an oscillating fluid flow through it and an externally superimposed axial temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

Elastocaloric heat pump with specific cooling power of 20.9 W g–1 exploiting snap-through instability and strain-induced crystallization

et al. 2021

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Conventional refrigeration relies on hazardous agents, contributing to global warming. Soft, cheap, biodegradable solid-state elastocaloric cooling based on natural rubber offers an environmental friendly alternative. However, no such practical cooler has been developed, as conventional soft elastocaloric designs are not fast enough to ensure adiabaticity.In this work, we combine snap-through instability with strain-induced crystallization and achieve a sub-100 ms quasi-adiabatic cycling which is 30 times faster than previous design.Negligible heat exchange in expansion/contraction stages combined with the latent heat of phase transitions result in a giant elastocaloric crystallization effect. The rubber-based all-soft heat pump enables a specific cooling power of 20.9 W/g, a heat-flux of 256 mW/cm 2 , a coefficient of performance of 4.7 and a single-stage temperature span between hot and cold reservoirs of 7.9 K (full adiabatic temperature change of rubber membrane exceeding 23 K).The pump permits a compact all-soft voltage-actuated setup, opening up the opportunity of a viable plug-in-ready cooling device.

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Section: Introductionmentioning

confidence: 99%

Elastocaloric heat pump with specific cooling power of 20.9 W g–1 exploiting snap-through instability and strain-induced crystallization

et al. 2021

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“…In that respect, most of the fluidic models for MC devices have been validated experimentally, as seen in Table 2. With respect to EC devices, only two models were validated experimentally: the model of Gong et al 136 and that of Plaznik et al 134 Only the model of Sebald et al was validated for the case of eC devices 170 . Figure 12 shows the validation of this eC system model.…”

Section: Numerical Implementationmentioning

confidence: 99%

“…B, Numerical results using the same parameters of the system of A. Reproduced from Ref. 170, with the permission of AIP Publishing…”

Section: Numerical Implementationmentioning

confidence: 99%

Caloric devices: A review on numerical modeling and optimization strategies

2021

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Summary The discovery of giant caloric effects and further investigation on device systems that can compete with current heat management technologies in terms of efficiency have led to a major increase in modeling investigations. These models have been crucial in designing the most efficient, cheap, and robust setups with reliable performances. One example is the modeling of magnetic refrigerators and heat pumps that has been used in the optimization of critical geometrical parameters of magnetocaloric regenerators. In this paper, we review the model components of caloric heat pump and refrigerator systems, including field generation, heat transfer, caloric effects, fluid dynamics, and loss mechanisms. We also review the optimization strategies used so far, which are based on sensitive analysis, brute force approaches, statistical learning, and genetic algorithms. The analysis is applied to magnetocaloric, electrocaloric, elastocaloric, and barocaloric systems.

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“…1 Among elastocaloric materials, elastomers are of interest due to their elastocaloric effect being triggered by small stress values (a few MPa) and the associated significant temperature variations which can reach 14 K. [6][7][8][9] In addition, they are cheap materials. For these reasons, the use of elastomers in solid-state cooling systems is gaining widespread interest in several scientific communities, 9,10 and strongly motivates studying the elastocaloric effect of various elastomers.…”

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confidence: 99%

“…This melt processability can be advantageous for making complex hermetic systems at lab scale for testing elastocaloric devices such as regenerative systems incorporating a fluid. 10 Previous investigations have brought to light the strain-induced crystallization (SIC) of crosslinked and thermoplastic polyurethanes (TPU) using calorimetry and X-ray diffraction (XRD). [20][21][22][23][24] The main objective of this work is to evidence the reversible SIC of the TPU chosen for this study by the aforementioned techniques and the second aim is to study the elastocaloric effect of TPU by stretching the samples rapidly at 1600%.s -1 and measuring the temperature variation.…”

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confidence: 99%

Elastocaloric properties of thermoplastic polyurethane

Coativy

Haissoune

Seveyrat

et al. 2020

Applied Physics Letters

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Very few studies have explored the elastocaloric effect of elastomers other than natural rubber (NR). The aim of the present article is thus to evalute the elastocaloric properties of a thermoplastic polyurethane (TPU) in terms of microstructural characteristics and thermoelastic coupling. Calorimetric measurements showed two successive peaks at 240 K and 282 K, attributed to respectively the crystallization and melting of soft segments. X-ray diffraction indicated that TPU exhibited a fully reversible strain-induced crystallization (SIC) at room temperature. Thermomechanical experiments performed at different elongations revealed a minimum adiabatic temperature variation of about -8 K after retraction of a sample initially elongated at λ=5. This is comparable to NR performances. However, for cycles carried out between λ=1 and λ=5, tensile stress/elongation curves showed a non-elastic behavior of TPU.A pseudo-elastic response was obtained for cyclic elongation when unloading was incomplete, in our case when λ was between 3 and 5. The recorded peak-to-peak temperature variation decreased from 4.5 K to 3.3 K when the number of cycles was increased to 5000. Despite that the issue of fatigue resistance for TPU needs to be adressed, this work opens new perspectives for studying the elastocaloric properties of various polyurethanes (whether crosslinked or thermoplastic) as well as other materials with a tendency for strain-induced crystallization, such as polychloroprene, hydrogenated acrylonitrile butadiene rubber and others.

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Regenerative cooling using elastocaloric rubber: Analytical model and experiments

Cited by 29 publications

References 51 publications

Elastocaloric heat pump with specific cooling power of 20.9 W g–1 exploiting snap-through instability and strain-induced crystallization

Elastocaloric heat pump with specific cooling power of 20.9 W g–1 exploiting snap-through instability and strain-induced crystallization

Caloric devices: A review on numerical modeling and optimization strategies

Elastocaloric properties of thermoplastic polyurethane

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