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Performance enhancement of a thermoelectric system with improved natural convection cooling by utilizing the chimney effect

机译：通过利用烟囱效应改善自然对流冷却的热电系统性能提高

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摘要

Due to the lack of sufficient auxiliary electrical energy to drive pumps or fans, the cooling of autarkic thermoelectric systems is confined to the natural convection mechanism. This is regarded as a key weakness and inhibits an adequate overall thermoelectric system performance. In order to enhance the performance of thermoelectric generators (TEG) for powering small consumer units like self-sufficient wireless sensor nodes (WSN), this paper presents a heat exchanger concept to improve the cooling of the TEG. The concept comes without any auxiliary energy and is based on utilizing the chimney effect to improve the cooling rate of a simple fin heat exchanger. With this concept it is experimentally proven, that the electrical output power of a TEG can be enhanced up to 46,2% compared to the conventional passive cooling method with a finned heat exchanger. Furthermore, this paper presents a CFD simulation to reveal further design optimization potential for the proposed heat exchanger apparatus.
机译：由于缺乏足够的辅助电能来驱动泵或风扇，自动前缘热电系统的冷却局限于自然对流机构。这被认为是关键的弱点，并抑制足够的整体热电系统性能。为了提高热电发电机（TEG）的性能，用于为自给式无线传感器节点（WSN）提供的小消费者单元（WSN）提供动力，呈现热交换器概念，以改善TEG的冷却。该概念没有任何辅助能量，并且基于利用烟囱效应来提高简单翅片热交换器的冷却速率。利用这种概念，它在实验上证明，与具有翅片热交换器的传统的被动冷却方法相比，可以提高TEG的电输出功率高达46,2％。此外，本文提出了CFD模拟，以揭示所提出的热交换器装置的进一步设计优化电位。

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