Evaluation of New PCM/PV Configurations for Electrical Energy Efficiency Improvement through Thermal Management of PV Systems
Evaluation of New PCM/PV Configurations for Electrical Energy Efficiency Improvement through Thermal Management of PV Systems
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DOI：
10.3390/en14144130
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发表时间：
2021-07
期刊：
影响因子：
3.2
通讯作者：
A. Ahmad;H. Navarro;Saikat Ghosh;Yulong Ding;J. N. Roy
中科院分区：
文献类型：
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作者：
A. Ahmad;H. Navarro;Saikat Ghosh;Yulong Ding;J. N. Roy
晴天时，光伏组件的温度可高于环境温度35℃，功率损耗高达- 0.65%/℃，严重影响光伏组件的性能和电效率。为了降低和控制光伏面板温度，科学界提出了不同的策略和创新方法，其中之一是采用相变材料（PCM）进行被动冷却。但是，几何形状、绝缘、相变温度、环境温度、太阳辐射等因素对光伏组件输出功率和效率的影响还需要进一步优化研究。因此，目前的工作旨在研究几种系统配置和不同的pcm (RT42， RT31和RT25)，并通过计算流体动力学（CFD）工具比较有和没有绝缘的系统。最终目标是优化和控制光伏组件的温度，并评估其系统效率和发电量。结果表明：与矩形PCM容器相比，即使在PCM的熔化温度低于平均环境温度的情况下，在PV温度变化可以忽略不计的情况下，梯形1的冷却性能也明显更好。此外，研究表明，与没有保温箱相比，在PCM容器中安装保温箱会增加所需的PCM数量，并且增加的数量取决于PCM的类型。新提出的PV/PCM系统配置在高峰时段的效率和发电量分别提高了17%和14.6%。
Photovoltaic modules during sunny days can reach temperatures 35 °C above the ambient temperature, which strongly influences their performance and electrical efficiency as power losses can be up to −0.65%/°C. To minimize and control the PV panel temperature, the scientific community has proposed different strategies and innovative approaches, one of them through passive cooling with phase change materials (PCM). However, further investigation, including the effects of geometric shape, insulation, phase change temperature, ambient temperature, and solar radiation on the PV module power output and efficiency, needs further optimization and research. Therefore, the current work aims to investigate several system configurations and different PCMs (RT42, RT31, and RT25) and compare the system with and without insulation through computational fluid dynamic (CFD) tools. The final goal is to optimise and control the temperature of PV modules and evaluate their system efficiency and energy generation. The results showed that compared with a rectangular shape of the PCM container, the trapezoid-one exhibits a considerably better cooling performance with a negligible variation of the PV temperature, even when the melting temperature of the PCM was lower than the average ambient temperature. Moreover, the study showed that having insulation in the PCM container increases the amount of PCM needed, compared with no insulation case, and the increased amount depends on the PCM type. The newly proposed PV/PCM system configuration shows an efficiency and power generation enhancement of 17% and 14.6%, respectively, at peak times.