Novel thermal switch based on magnetic nanofluids with remote activation

Puga, Joel B.; Bordalo, Bernardo D.; Silva, Daniel J.; Dias, Madalena M.; Belo, João H.; Araújo, João P.; Oliveira, J. C. R. E.; Pereira, A. M.; Ventura, J.

doi:10.1016/j.nanoen.2016.11.031

Cited by 46 publications

(33 citation statements)

References 31 publications

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“…Nevertheless, the argument was made that a heat pump based on only Peltier modules could perform better than one that combined micro‐Peltier modules with a magnetocaloric material. The first experimental evaluation of this proposition was performed in 2017 by Puga et al, who utilized a ferrofluidic thermal switch. The motion of the ferrofluid was driven in one direction by the magnetic field and in the other by gravity.…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

349

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

349

156

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“…A passive thermal switch has no energy consumption and requires less maintenance, and thus is generally preferred to an active switch. Such a high‐performance thermal switch has tremendous potential in solid‐state refrigeration, adiabatic demagnetization refrigerator, waste heat scavenging, and several other specific thermal circuits …”

Section: Introductionmentioning

confidence: 99%

A Passive Thermal Switch with Kirigami‐Inspired Mesostructures

Heo

Bao

et al. 2019

Adv Eng Mater

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The objective of this work is to design a passive thermal switch with Kirigami-inspired architected materials composed of bilayer hinges and to analyze thermomechanical and thermal performance at the ON/OFF states based on a composition of materials and geometry of metamaterials. Analytical models are constructed to determine the thermal deformation and heat transport of the metamaterial, followed by finite element-based simulations. A two-step design approach À i) selection of multi-materials and ii) geometric modification of mesostructures provides a robust method for the design of a passive thermal switch with Kirigami-inspired metamaterials. The mesostructures designed have potential as a passive thermal switch enabling to engineer a large thermal deformation, a small thermal resistance, and a sizable thermal switch ratio. With a systematic approach, this work demonstrates that Kirigami structures with multi-materials can be potentially used for a tool of thermal transport.

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“…Nanofluids [29], made of high thermal conductivity nanoparticles suspended in a fluid, display enhanced thermal properties and are more effective in heat removal. In particular, magnetic nanofluids, besides offering enhanced thermal conductivities, can be externally redirected to specific areas on demand by just applying small magnetic fields [2,27]. Thus, they can be moved into localized hot spots where they can absorb heat that is then released at a far away location after the field is removed.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous work [2], the authors reported a novel magnetically-actuated thermal switch (MATS) relying on the mechanical motion of permanent magnets to move a magnetic nanofluid between two surfaces at different temperatures. Such apparatus allowed the realization of heat transference between hot and cold sides with a remote operation ( Fig.…”

Section: Introductionmentioning

confidence: 99%