【Applied Energy最新原创论文】一种提高混合PV-STEG系统发电量的被动蒸发冷却策略

AEii国际应用能源 · 公众号 · · 2023-08-27 18:30

正文

原文信息：

A passive evaporative cooling strategy to enhance the electricity production of hybrid PV-STEG system

原文链接：

https://doi.org/10.1016/j.apenergy.2023.121689

Highlights

(1) 开发了一种被动蒸发冷却策略来冷却PV-STEG系统

(2) 研究了各种环境参数的影响

(3) 建立了一个三维数值模型来探索各个场的分布

摘要

光伏-热电联合发电（PV-STEG）系统可靠高效的热调节技术对保证输出性能具有重要意义。为了提高PV-STEG系统的电气性能，本文提出了一种被动蒸发冷却（PEC）技术。详细讨论了一些关键参数，如太阳聚光比、环境温度、相对湿度、空气流速和水层厚度，以综合评估对系统温度、发电量和能量转换效率的影响。研究结果表明，与未冷却的PV-STEG系统相比，采用PEC技术可以大大降低PV-STEG的工作温度。在聚光比为5的情况下，PEC技术可以实现92.09K的冷却降温。此外，系统性能在很大程度上受到环境条件的影响。

更多关于"hybrid PV-STEG system"的研究请见：

https://www.sciencedirect.com/search?qs=hybrid%20PV-STEG%20system&pub=Applied%20Energy&cid=271429

Abstr act

The dependable and efficient thermal regulation technology for combined photovoltaic-solar thermoelectric generator (PV-STEG) system is of great importance to ensure output performance. To enhance the electrical behavior of PV-STEG system, a passive evaporative cooling (PEC) technique was presented in this work. Some critical parameters such as solar concentration ratio, ambient temperature, relative humidity, air velocity, and water layer thickness were discussed in detail for a comprehensive assessment of the influence on system temperature, electricity production, and energy conversion efficiency. The obtained findings suggested that adopting PEC technology may greatly lower the operating temperature of the PV-STEG system when compared to the uncooled PV-STEG system. At the solar concentration ratio of 5, the maximum temperature reduction of 92.09 K can be achieved with the assistance of PEC technology. Furthermore, the system performance is greatly influenced by ambient conditions. For example, if the system is exposed to lower ambient temperature, lower relative humidity, and higher air velocity, it produces more electrical power. In addition, compared with other factors, the impact of the water layer thickness is quite gentle, and the temperature difference is less than 1 K. However, there also exists an optimal water layer thickness, and the specific value is 1 mm when the solar concentration ratio is 3. Moreover, compared to traditional passive fin cooling technology, this system demonstrates superior performance.

Keywords

Evaporative cooling;

PV-STEG;

Thermal regulation;

Electrical behavior.

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