The optimization of the energy performances of a single bunch of elastocaloric elements to be employed in an experimental device

Cirillo, Luca; Farina, Adriana Rosaria; Greco, Adriana; Masselli, Claudia

doi:10.1016/j.tsep.2021.101152

Cited by 14 publications

(4 citation statements)

References 72 publications

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“…The MagnetoCaloric Effect (MCE) is a related phenomenon; thanks to a variable magnetic field (adiabatically) in the influence area of a magnetocaloric material, a temperature mutation is registered in the latter [23][24][25][26][27]. The concept is extendable to other nature fields, e.g., electrical, mechanical (stress or pressure), and applied to caloric materials [14,28,29] with coupling properties, the electrocaloric [30], elastocaloric [31,32], or barocaloric effects [33] are detectable. The employment of thermal diodes as thermal control elements and, more generally, the investigation on solid-to-solid heat transfer (SSHT) caloric systems is very recent, and it began around 12 years ago by Kitanowski and Egwolf [34].…”

Section: State Of the Artmentioning

confidence: 99%

“…If the heat transfer materials are conductive elements, to ensure a controlled heat transfer only in the desired steps of the cycle, an up-and-down motion of the caloric material is required, as visible in Figure 1a, proposed by Kitanovski and Egolf [32]. Another possibility is to design the SSHT system without any relative movements between the caloric material and the conductive elements through the concept of Thermal Diodes (TD), as visible in Figure 1b.…”

Section: Physical Phenomenon and Thermodynamic Cyclesmentioning

confidence: 99%

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A Solid-to-Solid 2D Model of a Magnetocaloric Cooler with Thermal Diodes: A Sustainable Way for Refrigerating

2023

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Solid-state caloric cooling is a viable route toward a more sustainable way of refrigerating. The refrigerants are solid-state materials with a caloric effect detectable by measuring a temperature variation through an external-field intensity change. The caloric effect could be particularized depending on the properties of the material and the type of field. Magnetocaloric is the effect occurring in ferromagnetic materials through the variation of an external field. Thermodynamically, two are the possible cycles regulating the cooling process in the system: the Active Caloric Regenerative cooling cycle and the solid-to-solid heat transfer (SSHT). The former requires the involvement of an auxiliary fluid for the heat transfer processes; in the latter, the heat transfer can be regulated by thermal diodes with the capability of changing their thermal conductivity depending on the intensity of an external field. The investigation introduced is focused on an SSHT system employing magnetocaloric materials as refrigerants and thermal diodes as the vehiculation elements. The two-dimensionality of the model allows the optimization of the dimensions of both the magnetocaloric and the thermal diode elements to achieve elevated operative frequencies. A comparison between two magnetocaloric materials was performed, Gadolinium and LaFe11.384Mn0.356Si1.26H1.52. Encouraging results on the system, suitably employable in the field of electronic circuit cooling, have been found.

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Section: State Of the Artmentioning

confidence: 99%

Section: Physical Phenomenon and Thermodynamic Cyclesmentioning

confidence: 99%

A Solid-to-Solid 2D Model of a Magnetocaloric Cooler with Thermal Diodes: A Sustainable Way for Refrigerating

2023

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“…Many are the models developed and published in open literature; most of them are one-dimensional [34]. Cirillo et al [35,36] realized a two-dimensional tool of a single bunch of EC wires based on finite-element method able to reproduce step by step the velocity and the pressure field of fluid, to predict more accurately the solid-to-fluid heat exchange. Through this tool the aspects related to the optimization of the frequency of the AeR cycle, the fluid velocity, the distance between two EC wires and their length were investigated.…”

Section: State Of the Art Of The Elastoclaoric Technologymentioning

confidence: 99%

CHECK TEMPERATURE: A Small-Scale Elastocaloric Device for the Cooling of the Electronic Circuits

Cirillo¹,

Greco²,

Masselli³

2022

IJHT

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Elastocaloric is a technology to the class of solid-state cooling based on caloric-effects have attracted great interest in recent years, representing a new and viable alternative to vapour-compression. The physical phenomenon on which elastocaloric systems are based is elastocaloric effect: a physical-thermal phenomenon manifesting in some materials called shape memory alloys where, consequently to an adiabatic variation of the intensity of an external field, a temperature variation (ΔTad), occurs. If the intensity of the field is increasing, a temperature rise is observed in the elastocaloric material; conversely, to a decreasing intensity a temperature fall corresponds. Controlling the temperature of electronic equipment is also essential and, currently, there are not elastocaloric devices specifically addressed to this application. In this context CHECK TEMPERATURE (acronym of “Controlling the Heating of Electronic Circuits: a Key-approach Through Elastocaloric Materials in a Prototype Employing them as Refrigerants of an AcTive Ultrasmall Refrigerator”) project was born: the main purpose of this project is to develop an elastocaloric device targeted on miniature scale for environmentally friendly cooling of electronic components. In this paper all the aspect concerning the development are described.

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“…[51][52][53][54][55][56][57][58][59][60][61][62][63][64] For an actual cooler or heat pump, it always operates at a finite temperature lift between the hot side (heat sink) with a temperature of T h and the cold side (heat source) with a temperature of Tc. [65][66][67][68][69][70][71][72][73][74][75][76][77] Comprehensive characterizations of the superelastic and elastocaloric effects of NiTi and NiTi-based SMAs in the desired temperature range are vital to the development of this cutting-edge technology for green heating and air-conditioning.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the temperature-dependent superelastic and elastocaloric effects of a NiTi tube under compression at 293–330 K

Cheng,

Yan,

et al. 2024

AIP Advances

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Comprehensive characterizations of the superelastic and elastocaloric effects of NiTi and NiTi-based shape memory alloys (SMA) in the operation temperature region are highly desirable for using them in elastocaloric coolers with a large temperature lift. In this article, we report the superelastic and elastocaloric effects of a commercially available superelastic polycrystalline NiTi SMA tube with an outer diameter of 5 mm and a wall thickness of 1 mm between 293 and 330 K. The NiTi tube sample was subjected to a training of 250 cycles to stabilize its superelastic and elastocaloric effects. We observed that temperature dependencies existed for both superelastic and elastocaloric effects of the NiTi tube, and stress–strain curves differed much between isothermal and adiabatic loading conditions. The largest temperature rise and temperature drop measured at 293 K under an applied strain of 3.66% and a strain rate of 0.1 s−1 during loading and unloading were 21 and 11 K, respectively. The loading conditions (loading function and holding time) also impacted the superelastic effect of the NiTi tube. We identified two major reasons for the irreversibility of the adiabatic temperature change: the hysteresis heat dissipation and the temporary residual strain after unloading, and they affected the cooling performance of the elastocaloric cooler in different ways. We investigated the dependencies of the superelastic and elastocaloric effects on the maximum applied strain and the temperature distribution on the NiTi tube during loading and unloading. The results are beneficial to the modeling of elastocaloric coolers with large temperature lifts.

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The optimization of the energy performances of a single bunch of elastocaloric elements to be employed in an experimental device

Cited by 14 publications

References 72 publications

A Solid-to-Solid 2D Model of a Magnetocaloric Cooler with Thermal Diodes: A Sustainable Way for Refrigerating

A Solid-to-Solid 2D Model of a Magnetocaloric Cooler with Thermal Diodes: A Sustainable Way for Refrigerating

CHECK TEMPERATURE: A Small-Scale Elastocaloric Device for the Cooling of the Electronic Circuits

Characterization of the temperature-dependent superelastic and elastocaloric effects of a NiTi tube under compression at 293–330 K

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