Thermal management of concentrator photovoltaic systems using two-phase flow boiling in double-layer microchannel heat sinks
Thermal management of concentrator photovoltaic systems using two-phase flow boiling in double-layer microchannel heat sinks
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DOI：
10.1016/j.apenergy.2019.03.017
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发表时间：
2019-05
期刊：
影响因子：
11.2
通讯作者：
A. Radwan;S. Ookawara;Mahmoud A. Ahmed
中科院分区：
文献类型：
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作者：
A. Radwan;S. Ookawara;Mahmoud A. Ahmed
太阳光集中在光伏电池上会导致电池温度大幅上升，从而导致太阳能电池的性能显著降低和不可逆衰减。为此，提出了一种基于双层微通道热沉两相流动沸腾的新型冷却方法，用于聚光光伏系统的热调节实验研究。两种不同设计的散热器，即平行和逆流配置，集成在光伏模块的背面。将乙醇和Novec-7000（标准沸点温度为78.4 °C和34 °C）作为冷却液进行检测。实验研究了模拟聚光比、冷却剂流量、冷却剂类型和热沉设计对太阳电池温度分布的影响。结果表明，两相流动沸腾显著降低了电池的最高温度，获得了均匀的太阳能电池温度分布，提高了电效率。此外，微通道热沉的流动布置影响太阳能电池温度的变化。实验结果证实，与逆流配置相比，平行流配置仅在更高的流率下实现有效冷却。这项研究的结果表明，两相流沸腾的聚光光伏系统的热管理的潜力。
Sunlight concentration on photovoltaic cells causes a substantial increase in the cells’ temperature, which leads to a significant reduction in performance and irreversible decay of solar cells. Therefore, a novel cooling method based on two-phase flow boiling in monolithic double-layer microchannel heat sinks is developed to experimentally investigate the thermal regulation of concentrator photovoltaic systems. Two different designs of heat sinks, namely parallel and counter flow configurations, are integrated on the back-side of a photovoltaic module. Ethanol and Novec-7000 with standard boiling temperatures of 78.4 °C and 34 °C are examined as coolant fluids. The influences of varying the simulated solar light concentration ratio, coolant flowrate, coolant type, and heat sink design on the solar cell temperature distribution are experimentally investigated. The results indicate that two-phase flow boiling significantly reduces the maximum cell temperature, attains a uniform solar cell temperature distribution, and improves electrical efficiency. Furthermore, the microchannel heat sink flow arrangement affects the variation of solar cell temperature. Experimental results confirm that the parallel flow configuration attains effective cooling only at higher flowrates compared to the counter flow configuration. The findings of this study demonstrate the potential of two-phase flow boiling for the thermal management of concentrator photovoltaic systems.