Search query: thermoeletric

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author_names: Angel R O Sousa
title: Tuning the electral conductivity of an n type organic semiconductor by means of solution doping for thermoeletric applications
year: 2020

abstract: In this paper, a general numerical methodology is developed and validated for the simulation of steady as well as transient thermal and electrical behaviors of thermoelectric generator (TEG) based air flow self cooling systems. The present model provides a comprehensive framework to advance the study of self cooling applications by combining fluid flow, heat transfer and electric circuit simulations. The methodology is implemented by equation based coupled modeling capabilities from multidisciplinary fields to capture the dynamic thermos electric interaction in TEG elements, enabling the simulation of overall heating/cooling/power characteristics as well as spatially distributed thermal and flow fields in the entire device. Experiments have been conducted on two types of self cooling arrangements to measure the device temperature, voltage and power produced by TEG modules. It was found that the computational model was able to predict the experimental results within 5% error. A parametric study was carried out using the validated model to study the effect of heat sink geometry and TEG arrangements on device temperature and power produced by the device. It was found that the power for self cooling could be maximized by proper matching of the TEG modules to the fluid mover. Although an increase in fin density results in a rise in fan power consumption, a marked increase in net power and decreases in thermal resistance are observed.
author_names: Cheng-Xian Lin

Robel Kiflemariam
title: Numerical Simulation and Validation of Thermoeletric Generator Based Self Cooling System with Airflow
venue: Energies
year: 2019

abstract: Abstract The n type and p type thermoelectric property of nanoporous SnSe assembled by hollow cage cluster is studied by First principles calculations and Boltzmann transport theory. The nanoporous SnSe presents low Shear modulus (3.16 GPa) low Shear sound velocity (925 m/s) low average sound velocity (1203 m/s) low Debye temperature (101 K) and large Gruneisen parameter (3.3) which implies that weak Sn Se atomic interactions and strong anharmonicity of the bonding arrangement. Owing to the cubic structure of nanoporous SnSe, the thermoelectric property along different direction is isotropous. For n type, the optimal ZT at 800 K is 2.25, while the highest ZT of p type is 1.81. The strong differences between n type and p type are mainly dominated by the Seebeck coefficient, which is related to the carrier effective mass. This work not only demonstrates the excellent property of nanoporous SnSe, but also provides insights to understand the transport performance of cage structure.
author_names: Donglin Guo

Chunhong Li

Kejian Li

Bin Shao

Dengming Chen

Yilong Ma

Jianchun Sun

Xianlong Cao

Wen Zeng
title: The thermoeletric performance of nanoporous SnSe assembled by hollow cage cluster
year: 2021

abstract: Panas buang pada air conditioner merupakan energy berkualitas rendah yang terbuang cuma cuma ke lingkungan, kalor yang terbuang tersebut dapat dimanfaatkan untuk memanaskan modul thermoelektik generator (TEG) akan tetapi modul tersebut perlu didinginkan pada sisi lainnya agar tercipta perbedaan temperature pada kedua sisi modul. Pada penelitian ini dilakukan eksperimen dengan memanfaatkan dua media pendingin yaitu air dan refrigerant yang keluar dari evaporator pada sebuah heat exchanger tipe liquid plate yang besrfungsi sebagai heat sink Hasil pengujian menunjukkan kinerja terbaik didapatkan pada media refrigerant dimana open circuit voltage (V oc dan Short circuit current (I sc yang dihasilkan dari 10 modul yang disusun seri adalah 9,31 Volt dan 270.8 mA dengan selisih temperature 21.08 o C, dan pada media pendingin air V oc 7,5 Volt I sc 200,2 mA dengan selisih temperature 17,5 o C Kata Kunci: Air Conditioner Thermoelectric generator media pendingin, air refrigerant
author_names: Mustafa Mustafa

Muhammad Hasan Basri

Reyhan Kiay Demak
title: VARIASI MEDIA PENDINGIN PADA THERMOELETRIC GENERATOR YANG MEMANFAATKAN PANAS BUANG AIR CONDITIONER
year: 2018

abstract: iii LIST OF FIGURES vii LIST OF TABLES viii ACKNOWLEDGMENTS ix CHAPTER 1: INTRODUCTION .1 CHAPTER 2: BACKGROUND AND LITERATURE REVIEW .3 2.1 Literature Review .3 2.2 History .4 2.2.1 Thermocouple History .4 2.2.2 TEG History .5 2.2.3 Peltier History .6 2.3 Applications .6 2.3.1 Thermocouple/TEG .6 2.3.2 Peltier .8 2.4 Thermoelectric Generator vs Peltier .10 2.4.1 Cooling .10 2.4.2 Power Generation..10 2.4.3 Thermal Breakdown..10 2.4.4 Cost .11 2.4.5 Power Generation Efficiency .11 2.5 Thermoelectric Generator vs. Photovoltaic .11
author_names: Jamison A Olsten
title: Small scale thermoeletric generator for off grid power
year: 2017

abstract: Thermoelectric converters for power generation aim at reducing CO\(_2\ emission via the conversion of a part of the low grade waste heat generated by engines, industrial furnaces, gas pipes, etc. to electricity. The recovery of waste heat from the exhaust of an automotive engine, in particular, is an attractive, albeit not very efficient way for reduction of fuel consumption. Thermoelectric converters with high overall efficiency convert heat directly into electricity without moving parts and, thus, not only decrease our reliance on fossil fuels but also actively counteract global warming. State of the art converters are simply too inefficient to be economic, partly due to expensive elementary constituents (Te, Ge, etc. On this background, Heusler compounds with C1\(_b\ structure stand out on account of their relatively low cost components and have been extensively studied as potential thermoelectric materials for high temperature power generation up to 1000 K during the last years.
author_names: Julia Krez

Benjamin Balke
title: Thermoeletric Heusler Compounds
year: 2016

abstract: This paper presents a methodology to estimate thermoelectric module (TEM) internal parameters based on particle swarm optimization (PSO) algorithm. To obtain the correct TEM representation, it is necessary a proper model identification procedure to represent the TEM operation, both in DC and other relevant frequencies. Classical methods for linear parameter estimation are not suitable for the nonlinear TEM characteristics of the proposed model. We devise a model with twenty one parameters, which represent parts of the two TEMs employed, including top, lower and middle layers and heat sinks. The TEM is excited using an electrical current signal with power spectral density of a white noise, and the temperature response is adopted as output for the PSO algorithm to make the estimation. For numerical stability and proper estimation, the white noise excitation is filtered before, to obtain a dynamically persistent signal with high and low frequencies components. Simulation results show the effectiveness of the PSO in TEM parameters estimation.
author_names: G DanielR Ojeda

Luiz Alberto Luz de Almeida

Omar A C Vilcanqui
title: Parameter identification of thermoeletric modules using particle swarm optimization
venue: 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings
year: 2015

abstract: In this paper, a fuzzy controller using thermoelectric for temperature environmental tester is developed. The new structure of fuzzy controller based temperature environmental tester is proposed and implemented to maintain a stable temperature and improve temperature change speed. In order to evaluate the efficiency, an experiment is setup to compare PID controller with our proposed controller. The experimental results, we proved that our proposed fuzzy controller has better performance than PID controller.
author_names: Gi-Hyun Hwang
title: Development of Fuzzy Controller for Temperature Environment Tester Using Thermoeletric Module
year: 2015

author_names: Tsunehiro Takeuchi
title: Thermoeletric properties of Fe 2 VAl based thin films
year: 2015

abstract: Global warming and developments of alternative energy technologies have become important issues nowadays. Subsequently, the concept of energy harvesting is rising because of its ability of transferring waste energy into usable energy. Thermoelectric devices play a role in this field since there is tremendous waste heat existing in our lives, such as heat from engines, generators, stoves, computers, etc. Thermoelectric devices can extract the waste heat and turn them into electricity. Moreover, the reverse thermoelectric phenomenon has the function of cooling which can be applied to refrigerator or heat dissipation for electronic devices. However, the energy conversion efficiency is still low comparing to other energy technologies. The efficiency is judged by thermoelectric figure of merit (ZT) defined by Seebeck coefficient, electrical conductivity and thermal conductivity. In order to improve ZT, thin film materials are good candidates because of their structural effects on altering ZT. Ca3Co4O9 thin films grown by reactive radio frequency magnetron sputtering followed by post annealing process is studied in this thesis. Structural properties of the films with the evolution of elemental ratio (Ca/Co) of calcium and cobalt have been investigated. For the investigations, three samples having elemental ratio 0.82, 0.72, and 0.66 for sample CCO1, CCO2 and COO3, respectively, have been prepared. Structural properties of the films have been investigated by X ray diffraction (XRD) th 2th and pole figure analyses. Surface morphology of the films has been investigated by scanning electron microscopic (SEM) analyses. The highly oriented and phase pure epitaxial Ca3Co4O9 thin films were obtained in the end. Mixing of ScN and CrN to obtain ScxCr1 xN solid solution thin films by DC magnetron sputtering is the other task in this thesis. Growth of ScN and CrN thin films were studied first in order to get the best mixed growth conditions. The phase shifts between ScN (111) and CrN (111) peaks were observed in mixed growth films by XRD th 2th measurements, indicating the formation of ScxCr1 xN. Surface morphology of the films were investigated by SEM. The (111) oriented ScxCr1 xN thin films with decent surface smoothness grown by DC magnetron sputtering at 600 degC in pure nitrogen with bias were developed.
author_names: K Lin
title: Thin films for thermoeletric applications
year: 2014