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The Electrocaloric Effect


The Electrocaloric Effect
  • Author : Andrei Kholkin
  • Publisher : Woodhead Publishing
  • Release : 2022-06-15
  • ISBN : 0128216476
  • Language : En, Es, Fr & De
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The Electrocaloric Effect: Materials and Applications reviews the fundamentals of the electrocaloric effect, the most relevant electrocaloric materials, and electrocaloric measurements and device applications. The book introduces the electrocaloric effect along with modelling and simulations of this effect. Then it addresses the latest advances in synthesis, characterization, and optimization of the most relevant electrocaloric materials including ferroelectric materials, liquid materials, lead-free materials, polymers, and composites. Finally, there is a review of the latest techniques in measurement and applications in refrigeration and cooling. The advantages, challenges, and perspectives of the future of electrocaloric refrigeration are discussed. The Electrocaloric Effect is suitable for researchers and engineers in the disciplines of materials science, engineering, and physics. Includes comprehensive introduction to electrocaloric effect including experimental techniques to measure, model and simulate the effect Reviews the most relevant electrocaloric materials such as composites, polymers, metal oxides, ferroelectric materials, and more Touches on the design and application of electrocaloric materials for devices with potential cooling and refrigeration applications

Chip scale Cooling Devices Based On Electrocaloric Effect


Chip scale Cooling Devices Based On Electrocaloric Effect
  • Author : Haiming Gu
  • Publisher :
  • Release : 2014
  • ISBN : OCLC:894583662
  • Language : En, Es, Fr & De
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The electrocaloric effect (ECE) is a temperature and entropy change of an insulating material when there is an electric field induced polarization change. Recently, giant ECE was discovered in a series of dielectric materials, such as Polyvinylidene fluoride (PVDF) based polymers and ferroelectric ceramics. The ECE induced adiabatic temperature change in these materials can be higher than 10 K which makes them attractive because they provide the unique opportunity to explore and develop solid state cooling devices which are compact while providing high cooling power density and high efficiency compare to other cooling techniques, such as vapor compression refrigeration(VCR), thermoelectric, thermoacoustic, etc. A few ECE refrigerators have been studied in previous publications. However, the performance of those devices are still not so attractive. Besides, most of the existing works are based on simulation, and very few work has prototype demonstration.In this thesis, two types of chip scale ECE based cooling devices with more advanced configurations have been proposed, studied, and experimentally demonstrated. One is named as ElectroCaloric Oscillatory Refrigerator (ECOR), which involves solid-state plates with anisotropic thermal conductivity as regenerators. The low thermal conductivity along the temperature gradient direction can reduce the heat conduction loss thus highly improve the performance of the device. Finite volume simulation shows that the temperature span (Tspan) of the refrigerator can be as large as around 50 K. The volumetric cooling power density Pc and coefficient of performance (COP) of the refrigerator was also studied. The maximum Pc can reach to 9.2 W/cm3, while the COP remains at 6.5, which is about 45% of the Carnot efficiency.A prototype of ECOR was experimentally demonstrated. The EC module with multilayer structure was fabricated with high energy electro irradiated poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) copolymer thin film. The regenerators with anisotropic thermal conductivity was realized by cutting thin slits in stainless steel plate and then refilled with epoxy. The testing results show that a maximum value of 6.6 K Tspan was obtained when the device was working at 1 Hz and with an electric field of 100 MV/m.The second proposed device configuration is based on a rotary structure. This refrigerator involves no external regenerators. Instead, the regeneration process is realized by direct heat exchange between EC materials. The 1-D simulation results show that the Tspan of the device is nearly proportional to the number of segments in one ring (Ns), and the ECE induced adiabatic temperature change (Delta TECE). Owing to the absence of external regenerators, the Pc of this device can reach 33 W/cm3. Meanwhile, the COP of the device keeps above 8.5, which is about 60% of Carnot efficiency. 3-D finite element simulation validates the 1-D simulation results. A preliminary prototype was fabricated to demonstrate the proposed concept. About 0.8 K Tspan was obtained across the device when Delta TECE is 0.4 K.Compare with the existing ECE cooling devices, the ECOR device in this thesis involves solid state regenerator with anisotropic thermal conductivity which can highly reduce the conduction heat loss and thus improve the performance of the device. In the rotary cooling device, novel regeneration process is designed so that no external regenerators are required which also highly improve the cooling power density and efficiency of the device. The ideas of both solid state regenerator with anisotropic thermal conductivity, and the novel regeneration process are the main contributions of this thesis and will stimulate the development of high performance ECE cooling devices in the future.

Electrocaloric Materials


Electrocaloric Materials
  • Author : Tatiana Correia
  • Publisher : Springer Science & Business Media
  • Release : 2013-11-29
  • ISBN : 9783642402647
  • Language : En, Es, Fr & De
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Since the 1997 Kyoto protocol of reduction of greenhouse gas emissions, the development of novel refrigerators has been a priority within the scientific community. Although magnetocaloric materials are promising candidates, they still need a large magnetic field to induce a giant ΔT as well as powerful and costly magnets. However, in electrocaloric materials (ECMs) a temperature change may be achieved by applying or removing an electric field. Since a giant electrocaloric effect on ferroelectric thin films was reported in Science in 2006, researchers have been inspired to explore such effect in different ferroelectric thin films. This book reviews electrocaloric effects observed in bulk materials as well as recent promising advances in thin films, with special emphasis on the ferroelectric, antiferroelectric and relaxor nature of ECMs. It reports a number of considerations about the future of ECMs as a means of achieving an efficient, ecologically sustainable and low cost refrigerator.

A Study of the Electrocaloric Effect in KCl Li


A Study of the Electrocaloric Effect in KCl Li
  • Author : Victor Lawrence Taylor
  • Publisher :
  • Release : 1968
  • ISBN : CORNELL:31924004101220
  • Language : En, Es, Fr & De
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The Electrocaloric Effect of a New Kind of Impurity Mode


The Electrocaloric Effect of a New Kind of Impurity Mode
  • Author : Gaetano Lombardo
  • Publisher :
  • Release : 1971
  • ISBN : CORNELL:31924004036855
  • Language : En, Es, Fr & De
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