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The Electrocaloric Effect

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The Electrocaloric Effect

The Electrocaloric Effect Book
Author : Andrei Kholkin,Oleg V. Pakhomov,Alexander A. Semenov,Alexander Tselev
Publisher : Woodhead Publishing
Release : 2022-06-15
ISBN : 9780128216477
Language : En, Es, Fr & De

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Book Description :

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

A Study of the Electrocaloric Effect in KCl Li

A Study of the Electrocaloric Effect in KCl Li Book
Author : Victor Lawrence Taylor
Publisher : Unknown
Release : 1968
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download A Study of the Electrocaloric Effect in KCl Li book written by Victor Lawrence Taylor, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

The Electrocaloric Effect of a New Kind of Impurity Mode

The Electrocaloric Effect of a New Kind of Impurity Mode Book
Author : Gaetano Lombardo
Publisher : Unknown
Release : 1971
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download The Electrocaloric Effect of a New Kind of Impurity Mode book written by Gaetano Lombardo, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Electrocaloric Materials

Electrocaloric Materials Book
Author : Tatiana Correia,Qi Zhang
Publisher : Springer Science & Business Media
Release : 2013-11-29
ISBN : 364240264X
Language : En, Es, Fr & De

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Book Description :

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.

Chip scale Cooling Devices Based On Electrocaloric Effect

Chip scale Cooling Devices Based On Electrocaloric Effect Book
Author : Haiming Gu
Publisher : Unknown
Release : 2014
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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.

A Review of the Electrocaloric Effect in PMN xPT Ceramics

A Review of the Electrocaloric Effect in PMN xPT Ceramics Book
Author : Zachary J. Fifer,Schreyer Honors College
Publisher : Unknown
Release : 2009
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download A Review of the Electrocaloric Effect in PMN xPT Ceramics book written by Zachary J. Fifer,Schreyer Honors College, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Investigation of Electrocaloric Effects in Ferroelectric Substances

Investigation of Electrocaloric Effects in Ferroelectric Substances Book
Author : Gordon G. Wiseman
Publisher : Unknown
Release : 1968
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Investigation of Electrocaloric Effects in Ferroelectric Substances book written by Gordon G. Wiseman, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Electrocaloric Effect in Ferroelectric Relaxors

Electrocaloric Effect in Ferroelectric Relaxors Book
Author : Florian Le Goupil
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Electrocaloric Effect in Ferroelectric Relaxors book written by Florian Le Goupil, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Investigations of the Electrocaloric Effect in the Polycrystalline 0 9Pb Mg sub 1 3 Nb sub 2 3 O sub 3 0 1PbTiO sub 3 Relaxor Ferroelectric

Investigations of the Electrocaloric Effect in the Polycrystalline 0 9Pb Mg  sub   1 3  Nb  sub   2 3   O  sub  3  0 1PbTiO  sub  3 Relaxor Ferroelectric Book
Author : Marko Vrabelj
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Investigations of the Electrocaloric Effect in the Polycrystalline 0 9Pb Mg sub 1 3 Nb sub 2 3 O sub 3 0 1PbTiO sub 3 Relaxor Ferroelectric book written by Marko Vrabelj, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Electrocaloric Effect of Ferroelectrics and Relaxors

Electrocaloric Effect of Ferroelectrics and Relaxors Book
Author : Yangbin Ma
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Electrocaloric Effect of Ferroelectrics and Relaxors book written by Yangbin Ma, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Metrology of the Electrocaloric Effect Based on an Infrared Imaging Technique

Metrology of the Electrocaloric Effect Based on an Infrared Imaging Technique Book
Author : Maciej Konstanty Rokosz
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Metrology of the Electrocaloric Effect Based on an Infrared Imaging Technique book written by Maciej Konstanty Rokosz, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Frequency Dependent Electrocaloric EC Effect of Polymer Blends

Frequency Dependent Electrocaloric  EC  Effect of Polymer Blends Book
Author : Mudassar Shehzad
Publisher : LAP Lambert Academic Publishing
Release : 2014-12-02
ISBN : 9783659633966
Language : En, Es, Fr & De

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Book Description :

P(VDF-TrFE) is a normal ferroelectric/ or copolymer, while P(VDF-TrFE-CTFE) is a relaxor ferroelectric / or terpolymer. The Frequency dependent antiferroelectric-like behavior and Electrocaloric Effect of the former two polymer blends were estimated. It showed very interesting results which has been described on the basis of FTIR, XRD and Frequency dependent Dielectric Constant in this book in detail. The enhancement in the Electrocaloric effect (ECE) with the operational frequency is attributed to the antiferroelectric to paraelectric transition of polyemer blends. Finally the butterfly curves observed with heating and cooling cycles which depict the phenomenon of refrigeration. The change in entropy with the operational frequency showed that we can increase the performance of an electrocaloric (EC) refrigerator by lowering its operating frequency.

Thermal Hysteresis and Electrocaloric Effect in Ba1 xZrxTiO3

Thermal Hysteresis and Electrocaloric Effect in Ba1 xZrxTiO3 Book
Author : Anonim
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Thermal Hysteresis and Electrocaloric Effect in Ba1 xZrxTiO3 book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Indirect Measurement of the Electrocaloric Effect

Indirect Measurement of the Electrocaloric Effect Book
Author : James Scott Young
Publisher : Unknown
Release : 2012
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

In August 2011 at the International Symposium on Integrated Functionalities in Cambridge, a whole session was devoted to the electrocaloric effect, which is undergoing a modest renaissance. Surprisingly, the various reports showed that the indirect method of measuring cooling (described in the following sections) did not usually agree with the direct method (actually measuring temperature change with a thermometer). However, there was no obvious systematic error: sometimes the indirect temperature change was larger and sometimes smaller. The discrepancies were beyond the experimental errors. The majority of the present thesis is dedicated to careful reexamination of some of the assumptions made in the indirect method, both during measurement and in the subsequent data analysis that leads to inferred temperature changes. Experimentally, I conclude that the most serious systematic error is likely to be the unwarranted assumption that polarization and field measurements, recorded in hysteresis loops that are traced within a millisecond or less, are all taken at the same temperature. In reality, the experience of the material during such loops is neither isothermal nor adiabatic. Other systematic errors relate to data analyses and are discussed in detail. In some ways, therefore, this thesis has a negative flavour. But it is not designed to criticise prior work. Rather, it is intended to discriminate between reliable experimental procedures and those less convincing. This is a line of research with important technology transfer possibilities, and hence the numerical values of electric cooling must be unusually reliable if we are to avoid unwise capital investment as a country.

Electrocaloric Cooling

Electrocaloric Cooling Book
Author : Gunnar Suchaneck
Publisher : Unknown
Release : 2017
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

The electrocaloric effect describes a reversible temperature change in dielectric materials submitted to an applied electric field. Adiabatic polarization raises their temperature, and adiabatic depolarization lowers it, analogous to temperature changes that occur when a gas is compressed or expanded. For refrigerator application, the reverse Brayton cycle is currently the most promising for practical implementation. The electrocaloric effect provides a large material efficiency. However, existing refrigerator prototypes lack from the absence of efficient heat switches for thermal linkage to the load and the heat sink. Cooling power densities of a few W/cm2 and temperature spans in the order of 20 K (in regeneration systems) are achievable at a cycle time of 100 manuscript.