Power generation of annular thermoelectric generator with silicone polymer thermal conductive oil applied in automotive waste heat recovery
Power generation of annular thermoelectric generator with silicone polymer thermal conductive oil applied in automotive waste heat recovery
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DOI：
10.1016/j.energy.2023.128400
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发表时间：
2023
期刊：
影响因子：
9
通讯作者：
Wen-lu Yang;Wenchao Zhu;Banghua Du;Han Wang;Lamei Xu;C. Xie;Ying Shi
中科院分区：
文献类型：
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作者：
Wen-lu Yang;Wenchao Zhu;Banghua Du;Han Wang;Lamei Xu;C. Xie;Ying Shi
环形温差发电器(ATEG)与排气管的形状相匹配。为了提高汽车ATEG的发电效率，提出了一种利用有机硅聚合物基导热油来传递排气热量的方案。基于这一概念，设计了一种新型同心管式换热器。在考虑温度梯度、温度依赖性和流体阻力特性的基础上，建立了新系统的有限元模型。通过数值模拟研究了排气参数、热油参数和换热器结构对热电性能的影响。结果表明，与传统的ATEG相比，新发电机的最大输出功率增加了15.2%，同时最佳热电模块面积减少了19%。随着热油质量流量的增加，净功率呈现先增大后减小的趋势。热油质量流量可以根据排气参数的波动实时调整，以实现峰值净输出功率。最后，通过参数分析和推导，得到了换热器无量纲直径与总直径、排气参数与最佳热油质量流量之间的最佳拟合关系。
The annular thermoelectric generator (ATEG) matches the shape of the exhaust pipe. To improve the power generation efficiency of the ATEG in automobiles, a scheme is proposed to use a silicone polymer-based thermal conductive oil to transfer heat from the exhaust. Based on this concept, a new type of concentric tube heat exchanger is designed. A finite element model of the new system is established by considering temperature gradients, temperature dependence, and fluid resistance characteristics. Numerical simulations are performed to investigate the effects of exhaust parameters, thermal oil parameters, and heat exchanger structure on thermoelectric performance. The findings demonstrate a 15.2% increase in maximum output power of the new generator compared to a conventional ATEG, accompanied by a 19% decrease in the optimal thermoelectric module area. Furthermore, the net power first increases and then decreases with increasing thermal oil mass flow rate. The thermal oil mass flow rate can be adjusted in real-time based on fluctuations in exhaust parameters to achieve peak net output power. Finally, optimal fitting relationships between the heat exchanger dimensionless diameter and the total diameter, as well as between exhaust parameters and the optimal thermal oil mass flow rate, are obtained through parameter analysis and derivation.