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首页> 外文期刊>Energy Conversion & Management >Numerical modeling of a concentrated photovoltaic/thermal system which utilizes a PCM and nanofluid spectral splitting
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Numerical modeling of a concentrated photovoltaic/thermal system which utilizes a PCM and nanofluid spectral splitting

机译：用PCM和纳米流体谱分裂的浓缩光伏/热系统的数值模拟

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Spectral splitting concentrated photovoltaic/thermal systems aim to utilize the full spectrum of solar radiation by thermally decoupling the photovoltaic cells from the thermal components. Liquid absorptive filters are a type of spectral splitters which (ideally) transmit only the solar spectrum that can be most efficiently converted to electricity in the photovoltaic cell, while absorbing the rest for a thermal application to achieve a much higher total solar utilization. In this paper we attempt to advance this field by investigating the potential of employing a phase change material and a nanofluid to achieve a concentrated photovoltaic/thermal system with high energetic and exergetic efficiency. The optical properties of nanofluid and phase change material in solid and liquid states were simulated based upon data from the literature. Two different phase change materials, RT25 (paraffin) and S27 () and an Ag/water nanofluid were employed as the spectral filter components, with water as a coolant. After validating the model with available data from the literature, the effect of time, glass type, phase change material type, nanofluid position, and mass flow rate were analyzed with respect to the outlet temperature and the resultant energetic and exergetic efficiencies were calculated and compared against conventional concentrated photovoltaic/thermal and nanofluid-based spectral splitting concentrated photovoltaic/thermal systems. The results revealed that by employing the combination of the phase change material and the nanofluid it was possible to reduce the photovoltaic operation temperature (by up to 30%), increase the outlet temperature (by up to 54%), and obtain a relative improvement over previous systems in terms of the total exergetic efficiency (by up to 14.9%). The S27 leads to better performance than the RT25 due to the difference in their optical properties, which shows the importance of selecting the appropriate phase change material. By locating the phase change material below the nanofluid (instead of above it), the total energy and exergy efficiencies were increased by over 11 and 7%, respectively. The concentration ratio and the liquid filter's mass flow rate were found to have the most significant impact on the performance of the spectral splitting photovoltaic/thermal system. Overall, this study is significant because it develops a new pathway towards harvesting the full spectrum of incident solar energy.
机译：光谱分离浓缩光伏/热系统的目的，通过从热部件中热解耦光伏电池来利用整个太阳辐射。液体吸收滤波器是一种谱分路器，（理想地）仅发送可在光伏电池中最有效地转换为电力的太阳光谱，同时吸收其余的用于热应用以实现更高的总太阳能利用率。在本文中，我们试图通过研究采用相变材料和纳米流体的潜力来推进该领域，以实现具有高能量和前进效率的浓缩光伏/热系统。基于来自文献的数据模拟了固体和液态状态下的纳米流体和相变材料的光学性质。两种不同的相变材料，RT25（石蜡）和S27（）和Ag /水纳米流体用作光谱过滤器组分，用水作为冷却剂。通过从文献中的可用数据验证模型后，对出口温度分析时间，玻璃型，相变材料型，纳米流体位置和质量流量的效果，并计算了所得的能量和渗出效率针对常规的浓缩光伏/热和纳米流体基光谱分裂浓缩光伏分配浓缩光伏/热系统。结果表明，通过采用相变材料和纳米流体的组合，可以将光伏操作温度（高达30％）降低，增加出口温度（高达54％），并获得相对改善在以前的系统方面，在总锻炼效率方面（高达14.9％）。由于光学性质的差异，S27导致比RT25更好的性能，这表示选择合适的相变材料的重要性。通过定位纳米流体以下的相变材料（而不是上述），总能量和漏出效率分别增加了11％和7％。发现浓度比和液体过滤器的质量流量对光谱分裂光伏/热系统的性能产生最显着的影响。总体而言，这项研究是显着的，因为它开发了利用全谱的新型事件太阳能的新途径。

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