System efficiency and power: the bridge between the device and system of a thermoelectric power generator,Energy & Environmental Science

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System efficiency and power: the bridge between the device and system of a thermoelectric power generator
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-08-11 , DOI: 10.1039/d0ee01640c
Kang Zhu _{1,

2,

3,

4,

5} , Biao Deng _{1,

2,

3,

4,

5} , Pengxiang Zhang _{1,

2,

3,

4,

5} , Hee Seok Kim _{6,

7,

8,

9} , Peng Jiang _{10,

11,

12,

13,

14} , Weishu Liu _{1,

2,

3,

4,

5}

Affiliation

The thermoelectric efficiency formula (η_max), derived by Ioffe, provides a direct connection between the material dimensionless figure of merit ZT and the maximum efficiency of transformation of heat into electricity in an ideal device with fixed terminal temperatures. However, for a thermoelectric power generator (TEG) system made for practical use, it could meet diverse temperature scopes and heat transfer conditions, making the terminal temperatures floating rather than fixed. Here, we define the optimized system efficiency and power output based on an analytical model that provides a connection between the device and the system by considering constant material properties and varying thermal circumstances. It is found that the dimensionless cold side thermal resistance f_c has a larger inhibiting effect on the system performance than its hot side counterpart f_h, suggesting more thermal management efforts should be placed on the cold side. Furthermore, a general system level design strategy is proposed to obtain the engineering leg length and the aspect ratio by considering the condition of external thermal resistance, output power and voltage match. As an example, a predicted 2–3 times enhancement was experimentally confirmed in a room temperature TEG device.

中文翻译：

系统效率和功率：热电发电机的设备和系统之间的桥梁

热电效率公式（η_最大），通过约飞衍生，提供优点的材料无量纲之间的直接连接ZT在具有固定终端温度的理想设备中，将热量转化为电能的最大效率。但是，对于实际使用的热电发电机（TEG）系统，它可以满足各种温度范围和传热条件，从而使终端温度浮动而不是固定。在这里，我们基于分析模型定义了优化的系统效率和功率输出，该分析模型通过考虑恒定的材料属性和变化的热环境来提供设备与系统之间的连接。发现无量纲的冷端热阻f _c比热端热阻f _h对系统性能的抑制作用更大。，建议应将更多的热管理工作放在寒冷的一面。此外，提出了一种通用的系统级设计策略，通过考虑外部热阻，输出功率和电压匹配的条件来获得工程支脚的长度和纵横比。例如，在室温TEG设备中实验确认了预计的2-3倍增强。

更新日期：2020-10-14

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