Vortex Generators for Passive Cooling of Rooftop Photovoltaic Systems Under Free Convection

IF 2.5 3区工程技术 Q3 ENERGY & FUELS

IEEE Journal of Photovoltaics Pub Date : 2023-08-09 DOI:10.1109/JPHOTOV.2023.3299752

Zibo Zhou;Prateek Bahl;Svetlana Tkachenko;Asavari Hari;Charitha de Silva;Victoria Timchenko;Martin A. Green

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Abstract

Decreasing the operating temperature of a photovoltaic (PV) module can increase its electrical output and longevity. This can be achieved by increasing the radiative and convective heat losses on the front or the rear module surface. In this article, we have proposed and investigated, experimentally and numerically, a passive cooling method for the rooftop PV system, which enhances convection heat flux on the module's rear surface. As the vortex generators (VGs) are attached on the surface of the roof without physical contact to the module backsheet, this technique would not void the module warranty and can be easily retrofitted on an existing rooftop system. In the absence of wind (free convection), the module is subjected to the highest temperatures, and our VG design specifically targets this worst-case scenario. Our results reveal a temperature reduction of more than 4 °C using VGs in the configuration studied. This can be translated to a significant increase in module lifespan by around 30% to 40%, thus reducing the levelized cost of electricity.

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自由对流条件下屋顶光伏系统被动冷却的涡发生器

降低光伏(PV)组件的工作温度可以增加其电力输出和寿命。这可以通过增加前部或后部模块表面的辐射和对流热损失来实现。在本文中，我们提出并研究了一种用于屋顶光伏系统的被动冷却方法，该方法可以增强组件后表面的对流热通量。由于涡流发生器(vg)安装在屋顶表面，与模块背板没有物理接触，因此该技术不会使模块保修失效，并且可以很容易地在现有的屋顶系统上进行改造。在没有风(自由对流)的情况下，模块将承受最高温度，而我们的VG设计专门针对这种最坏情况。我们的研究结果显示，在研究的配置中使用VGs可以使温度降低4°C以上。这可以转化为模块寿命的显着增加约30%至40%，从而降低了电力的平均成本。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Journal of Photovoltaics ENERGY & FUELS-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.00

自引率

10.00%

发文量

206

期刊介绍： The IEEE Journal of Photovoltaics is a peer-reviewed, archival publication reporting original and significant research results that advance the field of photovoltaics (PV). The PV field is diverse in its science base ranging from semiconductor and PV device physics to optics and the materials sciences. The journal publishes articles that connect this science base to PV science and technology. The intent is to publish original research results that are of primary interest to the photovoltaic specialist. The scope of the IEEE J. Photovoltaics incorporates: fundamentals and new concepts of PV conversion, including those based on nanostructured materials, low-dimensional physics, multiple charge generation, up/down converters, thermophotovoltaics, hot-carrier effects, plasmonics, metamorphic materials, luminescent concentrators, and rectennas; Si-based PV, including new cell designs, crystalline and non-crystalline Si, passivation, characterization and Si crystal growth; polycrystalline, amorphous and crystalline thin-film solar cell materials, including PV structures and solar cells based on II-VI, chalcopyrite, Si and other thin film absorbers; III-V PV materials, heterostructures, multijunction devices and concentrator PV; optics for light trapping, reflection control and concentration; organic PV including polymer, hybrid and dye sensitized solar cells; space PV including cell materials and PV devices, defects and reliability, environmental effects and protective materials; PV modeling and characterization methods; and other aspects of PV, including modules, power conditioning, inverters, balance-of-systems components, monitoring, analyses and simulations, and supporting PV module standards and measurements. Tutorial and review papers on these subjects are also published and occasionally special issues are published to treat particular areas in more depth and breadth.