Performance of Concentrated Photovoltaic Cells Using Various Microchannel Heat Sink Designs
Performance of Concentrated Photovoltaic Cells Using Various Microchannel Heat Sink Designs
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使用各种微通道散热器设计的聚光光伏电池的性能
DOI：
10.1115/es2016-59411
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Ookawara
中科院分区：
文献类型：
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作者：
A. Radwan;Mahmoud A. Ahmed;S. Ookawara
光伏输出功率与太阳辐射成正比，与电池温度成反比。光伏温度越高，电效率越低，可能会损坏电池。为了提高发电效率并避免可能的损害，与有效的冷却技术相关联的聚光光伏系统是非常重要的。在本研究中，一种新的冷却技术，集中光伏（CPV）系统介绍了使用各种设计的微通道散热器。提出了平行流、逆流单、双层微通道以及与CPV系统集成的单层平板微通道的结构。建立了光伏层与微通道热沉集成的三维热流模型。该模型进行了数值模拟，估计太阳能电池的温度。数值结果与已有的实验和数值结果进行了验证。同时，研究了太阳能聚光比和冷却质量流量等不同运行参数对太阳能集热器性能的影响。使用不同的微通道配置的CPV的性能分析，以确定平均和本地的太阳能电池温度，泵浦功率，和温度均匀性。结果表明，微通道热沉的使用是一种非常有效的冷却技术，消除了热点的形成，显著降低了CPV的平均温度。与其他结构相比，单层平行流获得了最低的太阳能电池温度，而逆流获得了最均匀的温度分布。此外，对于给定的冷却质量流量，双层平行流微通道获得了最小的泵送功率。
The photovoltaic output power is directly proportional to the solar radiation and inversely with the cell temperature. The higher the photovoltaic temperature is, the lower the electrical efficiency is with possible damage to the cell. To improve the electrical efficiency and to avoid the possible damage, a concentrating PV system associated with an effective cooling technique is of great importance. In the present study, a new cooling technique for concentrated photovoltaic (CPV) systems was introduced using various designs of micro-channel heat sinks. The suggested configurations included parallel flow, counter flow single and double layer micro-channels, and single layer flat micro-channel integrated with CPV system. A comprehensive three-dimensional thermo-fluid model for photovoltaic layers integrated with microchannel heat sink was developed. The model was simulated numerically to estimate the solar cell temperature. The numerical results were validated with the available experimental and numerical results. In the meantime, the effects of different operational parameters were investigated such as solar concentration ratio and cooling mass flow rate. Performance analysis of CPV using different microchannel configurations was implemented to determine the average and local solar cell temperature, pumping power, and temperature uniformity. Results indicated that the use of microchannel heat sink was a very effective cooling technique which highly attained temperature uniformity, viz., eliminated the hot spots formation with a significant reduction in the average temperature of CPV. The single layer parallel flow achieved the minimum solar cell temperature while the counter flow attained the most uniform temperature distribution compared with other configurations. Furthermore, the double layer parallel flow microchannel attained the minimum pumping power for a given cooling mass flow rate.