Heat Transfer in Nanostructures for Solid-State Energy Conversion

2001 ◽  
Vol 124 (2) ◽  
pp. 242-252 ◽  
Author(s):  
G. Chen ◽  
A. Shakouri
Keyword(s):  
Heat Transfer ◽  
Solid State ◽  
Energy Conversion ◽  
State Energy ◽  
Energy Transport ◽  
Quantum Wires ◽  
Energy Conversion Efficiency ◽  
Phonon Transport ◽  
Device Development ◽  
Conversion Technologies

Solid-state energy conversion technologies such as thermoelectric and thermionic refrigeration and power generation require materials with low thermal conductivity but good electrical conductivity and Seebeck coefficient, which are difficult to realize in bulk semiconductors. Nanostructures such as superlattices, quantum wires, and quantum dots provide alternative approaches to improve the solid-state energy conversion efficiency through size and interface effects on the electron and phonon transport. In this review, we discuss recent research and progress using nanostructures for solid-state energy conversion. The emphasis is placed on fundamental issues that distinguish energy transport and conversion between nanoscale and macroscale, as well as heat transfer issues related to device development and property characterization.

Understanding Thermoelectrics Through Carrier and Phonon Transport

2021 ◽  
Vol 30 (10) ◽  
pp. 13-15
Author(s):  
Kyung Tae KIM
Keyword(s):  
Power Generation ◽  
Solid State ◽  
Energy Conversion ◽  
State Energy ◽  
Waste Heat ◽  
Phonon Transport ◽  
Peltier Effect ◽  
Research Issues ◽  
Technological Research ◽  
Active Cooling

Solid state energy conversion using thermoelectric (TE) phenomena has attracted great interest in power generation by using waste heat and active cooling/heating from electricity. Since first observation of the Seebeck and Peltier effect in the early 1820s, the TE phenomena has been applied in limited fields due to difficulties during the last two centuries in controling performance, which is related to both the carrier and the phonon transport behaviors. This article briefly introduces not only technological research issues for universal use of thermoelectrics but also the latest strategy for applications from the viewpoint of materials.

Chemically exfoliated nanosilicate platelet hybridized polymer electrolytes for solid state dye sensitized solar cells

2015 ◽  
Vol 39 (11) ◽  
pp. 8602-8613 ◽  
Author(s):  
Karuppanan Prabakaran ◽  
Smita Mohanty ◽  
Sanjay Kumar Nayak
Keyword(s):  
Solar Cells ◽  
Solid State ◽  
Solar Energy ◽  
Energy Conversion ◽  
Polymer Electrolytes ◽  
Dye Sensitized Solar Cells ◽  
Energy Conversion Efficiency ◽  
Dye Sensitized ◽  
Solar Energy Conversion Efficiency ◽  
Sensitized Solar Cells

Exfoliated MMT nanoplatelet incorporated PEO/PVdF–HFP electrolyte and TiO2/ZnO photoanode based DSSCs showed an improved solar energy conversion efficiency of about 3.8%.

scholarly journals Solid State Energy Conversion Energy Alliance (SECA)

2011 ◽  
Author(s):  
Daniel Hennessy ◽  
Rodica Sibisan ◽  
Mike Rasmussen
Keyword(s):  
Solid State ◽  
Energy Conversion ◽  
State Energy

scholarly journals Solid State Energy Conversion Energy Alliance (SECA)

2011 ◽  
Author(s):  
Daniel Hennessy ◽  
◽  
Rodica Sibisan ◽  
Mike Rasmussen ◽  
◽  
...  
Keyword(s):  
Solid State ◽  
Energy Conversion ◽  
State Energy

Improved Stability of Unsealed Quasi-Solid-State Dye-Sensitized Solar Cell Using Poly(3,4-Ethylenedioxythiophene) Film as Layer Electrolyte

2010 ◽  
Vol 663-665 ◽  
pp. 852-856
Author(s):  
Suthida Vivekaphirat ◽  
Chaiyuth Saekung ◽  
San H. Thang ◽  
Atchana Wongchaisuwat ◽  
Marisa Arunchaiya
Keyword(s):  
Solid State ◽  
Energy Conversion ◽  
Polymer Electrolyte ◽  
Energy Conversion Efficiency ◽  
Composite Polymer Electrolyte ◽  
Composite Polymer ◽  
Dye Sensitized ◽  
Additional Layer ◽  
Improved Stability ◽  
Pedot Layer

Quasi-solid/solid polymer electrolytes have been the subject of extensive research for an alternative of liquid electrolyte for dye-sensitized solar cells (DSSCs) because of their advantages such as alleviated leakage, lower environmental impact and ease of device fabrication. In this work, the performance of the unsealed quasi-solid-state DSSCs based on composite poly (ethylene oxide) (PEO) electrolyte and N719 dye-sensitizer was examined on aging under atmospheric condition. The energy conversion efficiency of DSSC using the composite PEO electrolyte was 5.62 % under sun simulated light, AM 1.5 (100 mW cm-2) but gradually decreased to 0.95 % on aging for 90 days. An additional layer of poly(3,4-ethylenedioxythiophene) (PEDOT) electrolyte was incorporated with the composite polymer electrolyte for DSSC fabrication. The PEDOT layer was prepared by electrochemical polymerization of bis-ethylenedioxythiophene (bis-EDOT) and characterized by Raman spectroscopy and cyclic voltammetry. It was found that the energy conversion efficiency of DSSC based on the composite polymer electrolyte incorporated with PEDOT layer was 5.57 % and gradually decreased to 1.76 % under the same aging condition. Thus an additional layer of PEDOT electrolyte provided an improved stability of DSSC.

scholarly journals Advanced Energy Conversion Technologies. Numerical Study on Radiation-Convection Heat Transfer.

2000 ◽  
Vol 26 (2) ◽  
pp. 180-186
Author(s):  
HIROSHI TANIGUCHI ◽  
TOSHIAKI OHMORI ◽  
MISAO IWATA ◽  
NORIO ARAI ◽  
KENJI HIRAGA ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Conversion ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Conversion Technologies

Atomistic Visualization of Ballistic Phonon Transport

2007 ◽  
Author(s):  
Neil Zuckerman ◽  
Jennifer R. Lukes
Keyword(s):  
Heat Transfer ◽  
High Frequency ◽  
Energy Transport ◽  
Imaging Techniques ◽  
Phonon Transport ◽  
Dynamics Simulation ◽  
Short Time Scale ◽  
Ballistic Phonons ◽  
Short Time ◽  
Phonon Focusing

Heat transfer in solid materials at short time scales, short length scales, and low temperatures is governed by the transport of ballistic phonons. In anisotropic crystals, the energy carried by these phonons is strongly channeled into well-defined directions in a phenomenon known as phonon focusing. Presented here is a new molecular dynamics simulation approach for visualizing acoustic phonon focusing in anisotropic crystals. An advantage of this approach over experimental phonon imaging techniques is that it allows examination of phonon propagation at selected modes and frequencies. The spatial, mode, and frequency dependence of ballistic energy transport gained with this approach will be useful for understanding heat transfer issues in high frequency electronics and short time scale laser-material interactions.

Finite Time Thermodynamics: Realizability Domain of Heat to Work Converters

2019 ◽  
Vol 44 (2) ◽  
pp. 181-191 ◽  
Author(s):  
M. A. Zaeva ◽  
A. M. Tsirlin ◽  
O. V. Didina
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Finite Time ◽  
Heat Engine ◽  
Energy Conversion Efficiency ◽  
Maximum Power ◽  
Working Fluid ◽  
Finite Time Thermodynamics

Abstract From the point of view of finite time thermodynamics, the performance boundaries of thermal machines are considered, taking into account the irreversibility of the heat exchange processes of the working fluid with hot and cold sources. It is shown how the kinetics of heat exchange affects the shape of the optimal cycle of a heat engine and its performance, with a focus on the energy conversion efficiency in the maximum power mode. This energy conversion efficiency can depend only on the ratio of the heat transfer coefficients to the sources or not depend on them at all. A class of kinetic functions corresponding to “natural” requirements is introduced and it is shown that for any kinetics from this class the optimal cycle consists of two isotherms and two adiabats, not only for the maximum power problem, but also for the problem of maximum energy conversion efficiency at a given power. Examples are given for calculating the parameters of the optimal cycle for the case when the heat transfer coefficient to the cold source is arbitrarily large and for kinetics in the form of a Fourier law.

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