Exploring the dynamic characteristics of thermoelectric generator under fluctuations of exhaust heat

被引：14
|
作者：
Luo, Ding [1 ]
Yan, Yuying [2 ]
Chen, Wei-Hsin [3 ,4 ,5 ]
Cao, Bingyang [1 ]
机构：
[1] Tsinghua Univ, Dept Engn Mech, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China
[2] Univ Nottingham, Fac Engn, Univ Pk, Nottingham NG7 2RD, England
[3] Natl Cheng Kung Univ, Dept Aeronaut & Astronaut, Tainan 701, Taiwan
[4] Tunghai Univ, Res Ctr Smart Sustainable Circular Econ, Taichung 407, Taiwan
[5] Natl Chin Yi Univ Technol, Dept Mech Engn, Taichung 411, Taiwan
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2024年 / 222卷
基金：
中国国家自然科学基金;
关键词：
Thermoelectric generator; Dynamic characteristics; Waste heat recovery; Exhaust heat; ENGINE; MODEL; OPTIMIZATION; PERFORMANCE; EFFICIENCY; CYCLE;
D O I：
10.1016/j.ijheatmasstransfer.2023.125151
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The thermoelectric generator is a potential candidate to recover waste heat from exhaust gas. Regarding the fluctuations of exhaust heat in practical situations, this paper adopts a transient fluid-thermal-electric multiphysics model to investigate the dynamic performance of the thermoelectric generator. Results show that the fluctuation of exhaust temperature has a greater influence on the dynamic characteristics than the fluctuation of exhaust mass flow rate. The dynamic performance of the thermoelectric generator benefits from a decrease in exhaust heat, but suffers when the exhaust heat is in an upward trend. Compared with the constant power and efficiency values of 4.96 W and 2.49 %, the average power and efficiency of the thermoelectric generator show a notable increase of 5.50 % and 70.61 % respectively during a step decrease in exhaust mass flow rate. Similarly, under a linear decrease, the mean power and efficiency experience a rise of 6.04 % and 45.05 % respectively. Besides, periodic exhaust heat can effectively amplify the dynamic output performance, especially for conversion efficiency. When subjected to a sin wave of exhaust mass flow rate, the efficiency experiences a 15.58 % improvement. This work offers a comprehensive understanding of the dynamic characteristics exhibited by the thermoelectric generator employed for waste heat recovery.
引用
收藏
页数：12
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