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<p>The thermoelectric effect generates an electric voltage when there's a temperature difference between two junctions, making it promising for energy conversion applications. However, its low conversion efficiency has been a significant challenge for its technological development and practical use. This study aims to enhance the performance and efficiency of thermoelectric modules by maximizing the temperature difference across the module using a direct evaporative cooler as a heat sink. We conducted both experimental and numerical analyses to examine the effects of key parameters of the evaporative cooler on the thermoelectric module's performance. Specifically, we examined the influence of air velocity, water flow rate, and the staging of the cooling pad on the system's efficiency and power output. Our results identified the optimal conditions for these parameters: an air velocity of 2.5&#xa0;m/s, a water flow rate of 3.2&#xa0;g/s, and a three-stage cooling pad configuration. Under these optimized conditions, the thermoelectric module achieved a significant increase in performance, with a maximum power output of 37.35 W and a conversion efficiency of 6.1%. This was attained at a temperature difference of approximately 150&#xa0;°C between the hot and cold surfaces of the module.</p>

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Enhancing a thermoelectric power generation system’s efficiency from a stove’s waste heat by optimizing the heat sink temperature junction using a direct evaporative cooler

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • Bimrew Tamrat Admasu,
  • Tazebew Dires Kassie,
  • Getu Alemayehu Melas,
  • Hailemariam Mulugeta,
  • S. Nagarajan

摘要

The thermoelectric effect generates an electric voltage when there's a temperature difference between two junctions, making it promising for energy conversion applications. However, its low conversion efficiency has been a significant challenge for its technological development and practical use. This study aims to enhance the performance and efficiency of thermoelectric modules by maximizing the temperature difference across the module using a direct evaporative cooler as a heat sink. We conducted both experimental and numerical analyses to examine the effects of key parameters of the evaporative cooler on the thermoelectric module's performance. Specifically, we examined the influence of air velocity, water flow rate, and the staging of the cooling pad on the system's efficiency and power output. Our results identified the optimal conditions for these parameters: an air velocity of 2.5 m/s, a water flow rate of 3.2 g/s, and a three-stage cooling pad configuration. Under these optimized conditions, the thermoelectric module achieved a significant increase in performance, with a maximum power output of 37.35 W and a conversion efficiency of 6.1%. This was attained at a temperature difference of approximately 150 °C between the hot and cold surfaces of the module.