Pyroelectric and dielectric energy conversion – A new view of the old problem

Poprawski, Wojciech; Gnutek, Z.; Radojewski, J.; Poprawski, R.

doi:10.1016/j.applthermaleng.2015.07.031

Cited by 15 publications

(17 citation statements)

References 43 publications

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“…Pyroelectric effect refers to the change of spontaneous polarization caused by temperature fluctuation in some polar materials. [2][3][4]28,29] The detailed explanation can refer to the schematic diagram of working mechanism of a pyroelectric generator in Figure 2. [29] Many electric dipoles are superimposed to form spontaneous polarization (Ps) perpendicular to the flat surface pyroelectric material, the stable spontaneous polarization within the pyroelectric material will attract nearby light particles with positive or negative charges.…”

Section: Pyroelectric Effectmentioning

confidence: 99%

Recent Advances in Pyroelectric Materials and Applications

Ding

Bowen

et al. 2021

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As one important subclass of piezoelectric materials, pyroelectric materials have caused increasing attention owing to the unique pyroelectric effect induced by spontaneous polarization, showing broad promising application prospects due to various electrical responses induced by time‐dependent temperature variation. This review systematically introduces the pyroelectric effect and evaluation of pyroelectric materials and follows by analyzing and concluding the novel properties corresponding to four kinds of main pyroelectric materials. The emphasis of this review focuses on several significant and practical applications of pyroelectric materials in thermal energy harvesting from the external environment, pyroelectric sensing, and imaging, even some electrochemical applications including hydrogen generation, wastewater treatment, sterilization, and disinfection. Finally, the development direction of pyroelectric materials, potential challenges and opportunities in the future are all discussed and proposed. Through systematical conclusion and analysis of the latest research progress in the recent two decades, this review may provide significant guide and inspiration in the development of pyroelectric materials.

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Section: Pyroelectric Effectmentioning

confidence: 99%

Recent Advances in Pyroelectric Materials and Applications

Ding

Bowen

et al. 2021

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132

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“…where 𝛾 is the pyroelectric coefficient, 𝜂 C the Carnot cycle efficiency, C V the specific heat of the unit volume, and T h temperature of the heat source. [79] The conversion efficiency for high performance pyroelectric materials could reach a few percent of the Carnot cycle efficiency. With solar energy conversion to the electricity as an example, assuming the amplitude of temperature change at 10 K, the pyroelectric conversion efficiency only reaches ≈0.3%.…”

Section: Thermal Energy Harvesting With Pyroelectric and Temperature Dependent Dielectric Effectsmentioning

confidence: 99%

“…[ 78 ] When 0.5Z pryo T h η c <<1, with Z pyro representing a temperature dependent factor determined by the pyroelectric coefficient, dielectric permittivity and specific heat, the energy conversion efficiency for the cycle in an energy converter can be estimated by Equation ( 1 ) below

where γ is the pyroelectric coefficient, η C the Carnot cycle efficiency, C V the specific heat of the unit volume, and T h temperature of the heat source. [ 79 ] The conversion efficiency for high performance pyroelectric materials could reach a few percent of the Carnot cycle efficiency. With solar energy conversion to the electricity as an example, assuming the amplitude of temperature change at 10 K, the pyroelectric conversion efficiency only reaches ≈0.3%.…”

Section: Ferroelectrics For Energy Harvestingmentioning

confidence: 99%

Enabling Distributed Intelligence with Ferroelectric Multifunctionalities

et al. 2021

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Distributed intelligence involving a large number of smart sensors and edge computing are highly demanded under the backdrop of increasing cyber-physical interactive applications including internet of things. Here, the progresses on ferroelectric materials and their enabled devices promising energy autonomous sensors and smart systems are reviewed, starting with an analysis on the basic characteristics of ferroelectrics, including high dielectric permittivity, switchable spontaneous polarization, piezoelectric, pyroelectric, and bulk photovoltaic effects. As sensors, ferroelectrics can directly convert the stimuli to signals without requiring external power supply in principle. As energy transducers, ferroelectrics can harvest multiple forms of energy with high reliability and durability. As capacitors, ferroelectrics can directly store electrical charges with high power and ability of pulse-mode signal generation. Nonvolatile memories derived from ferroelectrics are able to realize digital processors and systems with ultralow power consumption, sustainable operation with intermittent power supply, and neuromorphic computing. An emphasis is made on the utilization of the multiple extraordinary functionalities of ferroelectrics to enable material-critical device innovations. The ferroelectric characteristics and synergistic functionality combinations are invaluable for realizing distributed sensors and smart systems with energy autonomy.

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“…Heat pipe pyroelectric system with energy harvesting technology is similar to heat pipe TEG system. However, pyroelectric devices are more suitable where the temperature of the heat source changes over time [17,18]. The TEG system seems to be suitable because the heat source of this study is less temperature change with time.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of Heat Exchangers for Waste Heat Recovery from a Billet Casting Process

Kang

Kim

2019

Energies

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The application of the thermoelectric generator (TEG) system to various industrial facilities has been explored to reduce greenhouse gas emissions and improve the efficiency of such industrial facilities. In this study, numerical analysis was conducted according to the types and geometry of heat exchangers and manufacture process conditions to recover waste heat from a billet casting process using the TEG system. The total heat absorption increased by up to 10.0% depending on the geometry of the heat exchanger. Under natural convection conditions, the total heat absorption increased by up to 45.5%. As the minimum temperature increased, the effective area increased by five times. When a copper heat exchanger of direct conduction type was used, the difference between the maximum and minimum temperatures was significantly reduced compared to when a stainless steel heat exchanger was used. This confirmed that the copper heat exchanger is more favorable for securing a uniform heat exchanger temperature. A prototype TEG system, including a thermosyphon heat exchanger, was installed and a maximum power of 8.0 W and power density of 740 W/m 2 was achieved at a hot side temperature of 130 • C. The results suggest the possibility of recovering waste heat from billet casting processes.

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Pyroelectric and dielectric energy conversion – A new view of the old problem

Cited by 15 publications

References 43 publications

Recent Advances in Pyroelectric Materials and Applications

Recent Advances in Pyroelectric Materials and Applications

Enabling Distributed Intelligence with Ferroelectric Multifunctionalities

Heat Transfer Characteristics of Heat Exchangers for Waste Heat Recovery from a Billet Casting Process

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