Enhancing heat recovery efficiency in chimney exhaust systems using thermoelectric generators – Thermal modeling and parametric analysis

Obeida Farhat , Mahmoud Khaled , Jalal Faraj , Khaled Chahine , Farouk Hachem , Cathy Castelain
{"title":"Enhancing heat recovery efficiency in chimney exhaust systems using thermoelectric generators – Thermal modeling and parametric analysis","authors":"Obeida Farhat ,&nbsp;Mahmoud Khaled ,&nbsp;Jalal Faraj ,&nbsp;Khaled Chahine ,&nbsp;Farouk Hachem ,&nbsp;Cathy Castelain","doi":"10.1016/j.uncres.2025.100148","DOIUrl":null,"url":null,"abstract":"<div><div>The rising demand for sustainable energy solutions has made the utilization of waste heat from industrial processes a priority. Thermoelectric generators present an effective method for recovering and converting waste heat into useable electrical energy, therefore enhancing energy efficiency and sustainability. This study presents a parametric study of thermoelectric generators for waste heat recovery from heating chimney exhaust. In order to investigate the impact of placing the thermoelectric generators at different locations, simplified thermal resistance modeling was performed. Performance metrics demonstrate that the positioning of the thermoelectric generator site can bring about major improvements including thermal resistance, generated power, temperature of water heated, and energy conversion efficiency, which ranged from 0.57 % to 5.6 %, depending on thermoelectric generators configuration and operating parameters. By positioning thermoelectric generators on the exterior walls of the exhaust pipe, close to the heat source, a significant amount of electrical power—up to 37.67 W—could be produced. Additionally, a parametric analysis was conducted on important operating parameters: the mass flow rate and input temperatures of the exhaust gas and water. The application of 6 different cases showed that Case 5 of thermoelectric generator modules, with ṁ<sub>g</sub> = 0.25 kg/s, T<sub>g,i</sub> = 390 °C, ṁ<sub>w</sub> = 0.3 kg/s and T<sub>w,i</sub> = 20 °C, was the optimal condition, based on observations. The results demonstrate notable advancements in power production and energy recovery, and includes clear recommendations for future research that will bring about a shift in the direction of sustainable industrial operations.</div></div>","PeriodicalId":101263,"journal":{"name":"Unconventional Resources","volume":"6 ","pages":"Article 100148"},"PeriodicalIF":0.0000,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Unconventional Resources","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666519025000147","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

The rising demand for sustainable energy solutions has made the utilization of waste heat from industrial processes a priority. Thermoelectric generators present an effective method for recovering and converting waste heat into useable electrical energy, therefore enhancing energy efficiency and sustainability. This study presents a parametric study of thermoelectric generators for waste heat recovery from heating chimney exhaust. In order to investigate the impact of placing the thermoelectric generators at different locations, simplified thermal resistance modeling was performed. Performance metrics demonstrate that the positioning of the thermoelectric generator site can bring about major improvements including thermal resistance, generated power, temperature of water heated, and energy conversion efficiency, which ranged from 0.57 % to 5.6 %, depending on thermoelectric generators configuration and operating parameters. By positioning thermoelectric generators on the exterior walls of the exhaust pipe, close to the heat source, a significant amount of electrical power—up to 37.67 W—could be produced. Additionally, a parametric analysis was conducted on important operating parameters: the mass flow rate and input temperatures of the exhaust gas and water. The application of 6 different cases showed that Case 5 of thermoelectric generator modules, with ṁg = 0.25 kg/s, Tg,i = 390 °C, ṁw = 0.3 kg/s and Tw,i = 20 °C, was the optimal condition, based on observations. The results demonstrate notable advancements in power production and energy recovery, and includes clear recommendations for future research that will bring about a shift in the direction of sustainable industrial operations.

Abstract Image

利用热电发电机提高烟囱排气系统的热回收效率。热建模和参数分析
对可持续能源解决方案不断增长的需求使得利用工业过程中的废热成为一个优先事项。热电发电机提供了一种有效的方法来回收废热并将其转化为可用的电能,从而提高能源效率和可持续性。本文对利用热电发电机回收烟囱加热余热进行了参数化研究。为了研究不同位置放置热电发电机的影响,进行了简化的热阻建模。性能指标表明,热电发电机场地的定位可以带来重大的改进,包括热阻,产生的功率,加热水的温度和能量转换效率,范围从0.57%到5.6%,取决于热电发电机的配置和运行参数。通过将热电发电机放置在排气管的外壁上,靠近热源,可以产生大量的电能,最高可达37.67 w。此外,还对重要的运行参数:质量流量、废气和水的输入温度进行了参数化分析。6个不同工况的应用表明,观察结果表明,工况5中,ṁg = 0.25 kg/s, Tg,i = 390°C, ṁw = 0.3 kg/s, Tw,i = 20°C为最佳工况。研究结果表明,在电力生产和能源回收方面取得了显著进展,并为今后的研究提出了明确的建议,这些建议将向可持续工业运作的方向转变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
CiteScore
4.10
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信