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Thermal Management Systems and Waste Heat Recycling by Thermoelectric Generators—An Overview

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Thermal Management Systems and Waste Heat Recycling by Thermoelectric Generators—An Overview energies Review Thermal Management Systems and Waste Heat Recycling by Thermoelectric Generators—An Overview Sadeq Hooshmand Zaferani 1 , Mehdi Jafarian 2, Daryoosh Vashaee 3,4 and Reza Ghomashchi 1,5,6,* 1 School of Mechanical Engineering, University of Adelaide, Adelaide 5005, Australia; [email protected] 2 Centre for Energy Technology, School of Mechanical Engineering, University of Adelaide, Adelaide 5005, Australia; [email protected] 3 Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27606, USA; [email protected] 4 Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27606, USA 5 ARC Research Hub for Graphene Enabled Industry Transformation, University of Adelaide, Adelaide 5005, Australia 6 Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide 5005, Australia * Correspondence: [email protected] Abstract: With the fast evolution in greenhouse gas (GHG) emissions (e.g., CO2, N2O) caused by fossil fuel combustion and global warming, climate change has been identified as a critical threat to the sustainable development of human society, public health, and the environment. To reduce GHG emissions, besides minimizing waste heat production at the source, an integrated approach should be adopted for waste heat management, namely, waste heat collection and recycling. One solution to enable waste heat capture and conversion into useful energy forms (e.g., electricity) is Citation: Hooshmand Zaferani, S.; employing solid-state energy converters, such as thermoelectric generators (TEGs). The simplicity of Jafarian, M.; Vashaee, D.; thermoelectric generators enables them to be applied in various industries, specifically those that gen- Ghomashchi, R. Thermal erate heat as the primary waste product at a temperature of several hundred degrees. Nevertheless, Management Systems and Waste thermoelectric generators can be used over a broad range of temperatures for various applications; for Heat Recycling by Thermoelectric example, at low temperatures for human body heat harvesting, at mid-temperature for automobile Generators—An Overview. Energies exhaust recovery systems, and at high temperatures for cement industries, concentrated solar heat 2021, 14, 5646. https://doi.org/ exchangers, or NASA exploration rovers. We present the trends in the development of thermoelectric 10.3390/en14185646 devices used for thermal management and waste heat recovery. In addition, a brief account is presented on the scientific development of TE materials with the various approaches implemented to Academic Editor: Amir Pakdel improve the conversion efficiency of thermoelectric compounds through manipulation of Figure of Merit, a unitless factor indicative of TE conversion efficiency. Finally, as a case study, work on waste Received: 2 August 2021 heat recovery from rotary cement kiln reactors is evaluated and discussed. Accepted: 1 September 2021 Published: 8 September 2021 Keywords: energy conversion; waste heat recovery; thermoelectric generators; thermal management Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. 1. Introduction Global warming and the resulting climate change can be traced back to human activi- ties, industrial processes, and the resultant greenhouse gases (GHGs) emissions [1,2]. The primary source of GHGs emissions is the application of fossil fuels for energy production. Copyright: © 2021 by the authors. Therefore, one of the ways to reduce the emission of GHGs is to consume less fossil fuel. Licensee MDPI, Basel, Switzerland. However, this is only feasible if the energy is generated and used efficiently, i.e., having the This article is an open access article minimum energy loss and recycling the energy loss, which usually comes as waste heat. distributed under the terms and According to a recent study conducted by the Lawrence Livermore National Laboratory [3], conditions of the Creative Commons more than 68% of the generated energy is lost as waste heat, Figure1. However, amongst Attribution (CC BY) license (https:// the energy generation sectors, the majority of the rejected energy (waste heat) in the United creativecommons.org/licenses/by/ States belongs to electricity generation (24.2%), in comparison with the other sectors, in- 4.0/). Energies 2021, 14, 5646. https://doi.org/10.3390/en14185646 https://www.mdpi.com/journal/energies Energies 2021, 14, x FOR PEER REVIEW 2 of 20 Energies 2021, 14, x FOR PEER REVIEW 2 of 20 Energies 2021, 14, 5646 amongst the energy generation sectors, the majority of the rejected energy (waste heat)2 of in 20 the United States belongs to electricity generation (24.2%), in comparison with the other amongst the energy generation sectors, the majority of the rejected energy (waste heat) in sectors, including transportation (22.3%), industrial (13.5%), residential (4.17%), and com- the United States belongs to electricity generation (24.2%), in comparison with the other mercial (3.29%), as illustrated in Figure 1. sectors,cluding including transportation transportation (22.3%), (22.3%), industrial industrial (13.5%), (13.5%), residential residential (4.17%), (4.17%), and commercial and com- mercial(3.29%), (3.29%), as illustrated as illustrated in Figure in1 Figure. 1. Figure 1. Energy flow diagram of the US energy production and consumption. Source: Lawrence Livermore National Laboratory [3]. FigureFigure 1. 1. EnergyEnergy flow flow diagram diagram of of the the US energy production and consumption. Source: Source: Lawrence Lawrence Livermore Livermore National National Laboratory [3]. Laboratory [3]. It may take many years until renewable energies reach a position where they can fully replace fossil fuels. Consequently, other intermediate technologies are required to ItIt may may take manymany yearsyears until until renewable renewable energies energies reach reach a position a position where where they they can fullycan reduce carbon output (e.g., CO ) and increase the efficiency of the existing energy-gener- fullyreplace replace fossil fossil fuels. fuels. Consequently, Consequently, other other intermediate intermediate technologies technologies are required are required to reduce to ating technologies during this transition period. In this regard, Figure 2 illustrates the reducecarbon carbon output output (e.g., CO(e.g.,2) andCO ) increase and increase the efficiency the efficiency of the of existingthe existing energy-generating energy-gener- electricity generation from fuel energies (Figure 2a) and renewable energy sources (Figure atingtechnologies technologies during during this transition this transition period. peri In thisod. regard,In this Figureregard,2 illustratesFigure 2 illustrates the electricity the 2b) in the US, which are projected up to 2050. It is anticipated that a greater role for re- electricitygeneration generation from fuel from energies fuel (Figureenergies2a) (Figure and renewable 2a) and renewable energy sources energy (Figure sources2b) (Figure in the newable energy sources will satisfy future energy demand, as clearly demonstrated in 2b)US, in which the US, are which projected are up projected to 2050. up It is to anticipated 2050. It is thatanticipated a greater that role a for greater renewable role for energy re- Figure 3. newablesources willenergy satisfy sources future will energy satisfy demand, future asenergy clearly demand, demonstrated as clearly in Figure demonstrated3. in Figure 3. Figure 2. Electricity generation from selected energy resources, (a) fuel energies and (b) clean energies [4]. Figure 2. Electricity generation from selected energy resources, (a) fuel energies and (b) clean energies [4]. Figure 2. Electricity generation from selected energy resources, (a) fuel energies and (b) clean energies [4]. Energies 2021, 14, x FOR PEER REVIEW 3 of 20 Energies 20212021,, 1414,, 5646x FOR PEER REVIEW 3 of 20 Figure 3. Application of renewable energies in the future [4]. Figure 3. Application of renewable energiesenergies in the future [[4].4]. The forecast in Figure 3 is based on the trend of rapid deployment of clean energy The forecast in Figure 33 is is basedbased onon thethe trendtrend ofof rapidrapid deploymentdeployment ofof cleanclean energyenergy technologies, which is encouraging. Such growth in the renewable energy industry is ex- technologies, which which is is encouraging. encouraging. Such Such growth growth in inthe the renewable renewable energy energy industry industry is ex- is pected to show its impact on the projected CO emission in the electric power sector, as pectedexpected to toshow show its itsimpact impact on onthe the projected projected COCO emission2 emission in the in the electric electric power power sector, sector, as exhibited in Figure 4. As shown in this figure, the average CO emissions decrease with exhibitedas exhibited in Figure in Figure 4. As4. Asshown shown in this in thisfigure, figure, the theaverage average CO COemissions2 emissions decrease decrease with time. withtime. time. FigureFigure 4. 4. Energy-relatedEnergy-related CO2 emissions by the energy sector [[4].4]. Figure 4. Energy-related CO emissions by the energy sector [4]. The reduction in CO emission is related to energy harvesting from the environment The reduction in CO22 emission is related to energy harvesting from the environment The reduction in CO2 emission is related to energy harvesting from the environment byby
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