scholarly journals Solid-state cooling by elastocaloric polymer with uniform chain-lengths

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Shixian Zhang ◽  
Quanling Yang ◽  
Chenjian Li ◽  
Yuheng Fu ◽  
Huaqing Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Conformational Changes ◽  
Room Temperature ◽  
Entropy Change ◽  
Cooling Device ◽  
Elastocaloric Effect ◽  
Adiabatic Temperature Change ◽  
Cooling Devices ◽  
Chain Lengths ◽  
Solid State Cooling

AbstractAlthough the elastocaloric effect was found in natural rubber as early as 160 years ago, commercial elastocaloric refrigeration based on polymer elastomers has stagnated owing to their deficient elastocaloric effects and large extension ratios. Herein, we demonstrate that polymer elastomers with uniform molecular chain-lengths exhibit enormous elastocaloric effects through reversible conformational changes. An adiabatic temperature change of −15.3 K and an isothermal entropy change of 145 J kg−1 K−1, obtained from poly(styrene-b-ethylene-co-butylene-b-styrene) near room temperature, exceed those of previously reported elastocaloric polymers. A rotary-motion cooling device is tailored to high-strains characteristics of rubbers, which effectively discharges the cooling energy of polymer elastomers. Our work provides a strategy for the enhancement of elastocaloric effects and could promote the commercialization of solid-state cooling devices based on polymer elastomers.

scholarly journals Giant room temperature elastocaloric effect in metal-free thin-film perovskites

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Cheng Li ◽  
Yu Hui Huang ◽  
Jian-Jun Wang ◽  
Bo Wang ◽  
Yong Jun Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Room Temperature ◽  
Entropy Change ◽  
Stress Change ◽  
Chemical Doping ◽  
Metal Free ◽  
Organic Ferroelectrics ◽  
Potential Applications ◽  
Unit Stress

AbstractSolid-state refrigeration which is environmentally benign has attracted considerable attention. Mechanocaloric (mC) materials, in which the phase transitions can be induced by mechanical stresses, represent one of the most promising types of solid-state caloric materials. Herein, we have developed a thermodynamic phenomenological model and predicted extraordinarily large elastocaloric (eC) strengths for the (111)-oriented metal-free perovskite ferroelectric [MDABCO](NH4)I3 thin-films. The predicted room temperature isothermal eC ΔSeC/Δσ (eC entropy change under unit stress change) and adiabatic eC ΔTeC/Δσ (eC temperature change under unit stress change) for [MDABCO](NH4)I3 are −60.0 J K−1 kg−1 GPa−1 and 17.9 K GPa−1, respectively, which are 20 times higher than the traditional ferroelectric oxides such as BaTiO3 thin films. We have also demonstrated that the eC performance can be improved by reducing the Young’s modulus or enhancing the thermal expansion coefficient (which could be realized through chemical doping, etc.). We expect these discoveries to spur further interest in the potential applications of metal-free organic ferroelectrics materials towards next-generation eC refrigeration devices.

scholarly journals Waste Tire Rubber-based Refrigerants for Solid-state Cooling Devices

2020 ◽  
Vol 38 (7) ◽  
pp. 769-775
Author(s):  
Nicolau Molina Bom ◽  
Érik Oda Usuda ◽  
Mariana da Silva Gigliotti ◽  
Denílson José Marcolino de Aguiar ◽  
William Imamura ◽  
...  
Keyword(s):  
Solid State ◽  
Tire Rubber ◽  
Waste Tire ◽  
Cooling Devices ◽  
Waste Tire Rubber ◽  
Solid State Cooling

Negative/Positive Electrocaloric Effect in Single-Layer Pb(ZrₓTi1–x )O₃ Thin Films for Solid-State Cooling Device

2020 ◽  
Vol 67 (4) ◽  
pp. 1769-1775
Author(s):  
Sankar Prasad Bag ◽  
Xu Hou ◽  
Jingtong Zhang ◽  
Shuanghao Wu ◽  
Jie Wang
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Single Layer ◽  
Cooling Device ◽  
Electrocaloric Effect ◽  
Solid State Cooling

Thermal Transport in Nanostructured Solid-State Cooling Devices

2005 ◽  
Vol 127 (1) ◽  
pp. 108-114 ◽  
Author(s):  
Deyu Li ◽  
Scott T. Huxtable ◽  
Alexis R. Abramson ◽  
Arun Majumdar
Keyword(s):  
Thermal Conductivity ◽  
Solid State ◽  
Nanostructured Materials ◽  
Thermal Transport ◽  
Experimental Studies ◽  
Phonon Transport ◽  
Peltier Effect ◽  
Cooling Devices ◽  
Low Dimensional ◽  
Solid State Cooling

Low-dimensional nanostructured materials are promising candidates for high efficiency solid-state cooling devices based on the Peltier effect. Thermal transport in these low-dimensional materials is a key factor for device performance since the thermoelectric figure of merit is inversely proportional to thermal conductivity. Therefore, understanding thermal transport in nanostructured materials is crucial for engineering high performance devices. Thermal transport in semiconductors is dominated by lattice vibrations called phonons, and phonon transport is often markedly different in nanostructures than it is in bulk materials for a number of reasons. First, as the size of a structure decreases, its surface area to volume ratio increases, thereby increasing the importance of boundaries and interfaces. Additionally, at the nanoscale the characteristic length of the structure approaches the phonon wavelength, and other interesting phenomena such as dispersion relation modification and quantum confinement may arise and further alter the thermal transport. In this paper we discuss phonon transport in semiconductor superlattices and nanowires with regards to applications in solid-state cooling devices. Systematic studies on periodic multilayers called superlattices disclose the relative importance of acoustic impedance mismatch, alloy scattering, and crystalline imperfections at the interfaces. Thermal conductivity measurements of mono-crystalline silicon nanowires of different diameters reveal the strong effects of phonon-boundary scattering. Experimental results for Si/SiGe superlattice nanowires indicate that different phonon scattering mechanisms may disrupt phonon transport at different frequencies. These experimental studies provide insight regarding the dominant mechanisms for phonon transport in nanostructures. Finally, we also briefly discuss Peltier coolers made from nanostructured materials that have shown promising cooling performance.

Large and reversible elastocaloric effect near room temperature in a Ga-doped Ni–Mn–In metamagnetic shape-memory alloy

2017 ◽  
Vol 10 (01) ◽  
pp. 1740007 ◽  
Author(s):  
Juan-Pablo Camarillo ◽  
Christian-Omar Aguilar-Ortiz ◽  
Horacio Flores-Zúñiga ◽  
David Ríos-Jara ◽  
Daniel-Enrique Soto-Parra ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Room Temperature ◽  
Entropy Change ◽  
Martensitic Transition ◽  
Ferromagnetic Shape Memory Alloy ◽  
Temperature Changes ◽  
Elastocaloric Effect ◽  
Magnetocaloric Materials ◽  
Ferromagnetic Shape Memory

We report a giant elastocaloric effect near room temperature in a polycrystalline Ga-doped Ni–Mn–In ferromagnetic shape-memory alloy. The elastocaloric effect has been quantified by measuring both isothermal stress-induced entropy changes and adiabatic stress-induced temperature changes. A reproducible maximum entropy change, [Formula: see text] 25 [Formula: see text][Formula: see text][Formula: see text], upon cycling across the martensitic transition was obtained by application of a compressive stress of 100[Formula: see text]MPa. The corresponding maximum amount of cooling, [Formula: see text][Formula: see text]K, was measured when this stress was rapidly removed. These values are comparable with those reported for giant magnetocaloric materials, which are induced by application and release of a high magnetic field. Therefore, the studied material is a good candidate to be used in solid-state refrigeration devices based on the elastocaloric effect.

scholarly journals Reversible barocaloric effects over a large temperature span in fullerite C60

2020 ◽  
Vol 8 (39) ◽  
pp. 20354-20362 ◽  
Author(s):  
Junning Li ◽  
David Dunstan ◽  
Xiaojie Lou ◽  
Antoni Planes ◽  
Lluís Mañosa ◽  
...  
Keyword(s):  
Solid State ◽  
Room Temperature ◽  
Large Temperature ◽  
Low Pressures ◽  
Solid State Cooling

Giant reversible barocaloric effects at low pressures in a wide temperature span near room temperature in C60 for solid-state cooling.

Solid State Cooling Based on Elastocaloric Effect in Latex Rubber

2016 ◽  
Vol 845 ◽  
pp. 73-76 ◽  
Author(s):  
Evgeny V. Morozov ◽  
Dmitriy S. Kuchin ◽  
Victor V. Koledov ◽  
Vladimir G. Shavrov
Keyword(s):  
Solid State ◽  
Tensile Force ◽  
Relative Deformation ◽  
Self Heating ◽  
Elastocaloric Effect ◽  
Elastocaloric Cooling ◽  
Periodic Exposure ◽  
Thermodynamic Processes ◽  
Solid State Cooling ◽  
Latex Rubber

The elastocaloric effect (ECE) in latex rubber is experimentally investigated under periodic exposure to tensile force. ECE is measured as a function of elongation and frequency of cycles up to 4 Hz. It was found three ranges of the cycle frequencies in which the different thermodynamic processes were demonstrated: elastocaloric cooling, self-heating and decrease of ECE. The maximal measured value of ECE in latex rubber reached 14 K at relative deformation of the sample equal to 700% at frequencies from 0.1 Hz to 0.3 Hz. Also, the possibility of the practical use of latex rubber for elastocaloric based cooling is discussed.

Sign in / Sign up

Export Citation Format

Share Document