Abstract

The influence of internal heat sources on temperature distribution during the operation of thermoelectric generators (TEG) is investigated. Taking into account various factors affecting the temperature regime, including internal heat sources, a multilevel model of a two-stream TEG has been developed, which allows one to calculate the temperature distribution and the integral characteristics of the generator. The calculations were carried out using the PHOENICS program package; as a result, the dependences of the electrical characteristics and the temperature drop on the junctions on the load resistance, speed, and coolant temperature were obtained. A comparison is made with the corresponding indicators in the absence of internal heat sources. It is concluded that the influence of internal heat sources on the temperature drop and electric power increases with decreasing load resistance. Thus, in the maximum power mode, which corresponds to the ratio of the load resistance to the internal resistance of the module m = 1.15, the temperature drop decreases by 3.5–4.0%, while that at m = 0.01 is by 7.5–8.5%. TEG power in maximum power mode decreases by 7.5–8.0%. Studies have shown that the influence of internal heat sources on the characteristics of the TEG is more substantial when the flow rate in the heat exchangers is lower. The greatest decrease in the values of indicators due to the influence of internal sources was observed at v = 0.2 m/s and amounted in maximum power mode to 5.5–6.0% for the temperature difference and 12–13% for power. The results obtained indicate that the influence of internal sources on the characteristics of TEGs is significant enough, which implies that the most accurate estimates of the thermal and electrical performance of TEGs can be made only by taking into account the effect of internal heat sources on the temperature distribution in TEGs.

中文翻译：

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内部热源对热电发电机运行特性的影响研究

摘要

研究了热电发电机（TEG）运行期间内部热源对温度分布的影响。考虑到影响温度状态的各种因素，包括内部热源，已开发了两级TEG的多级模型，该模型可以计算出温度分布和发电机的整体特性。使用PHOENICS程序包进行计算；结果，获得了电气特性和结点温度下降对负载电阻，速度和冷却液温度的依赖性。在没有内部热源的情况下，与相应的指标进行比较。结论是，内部热源对温度下降和电功率的影响随着负载电阻的减小而增加。因此，在最大功率模式下，其对应于模块的负载电阻与内部电阻之比m = 1.15，温度下降幅度为3.5–4.0％，而m = 0.01的温度下降幅度为7.5–8.5％。最大功率模式下的TEG功率降低7.5–8.0％。研究表明，当热交换器中的流量较低时，内部热源对TEG特性的影响会更大。由于内部来源的影响，指标值的最大下降出现在v= 0.2 m / s，在最大功率模式下，温差为5.5–6.0％，功率为12–13％。所得结果表明，内部热源对TEGs特性的影响足够显着，这意味着只能通过考虑内部热源对TEGs的影响才能对TEGs的热和电性能进行最准确的估算。 TEG中的温度分布。