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Integration of concentrated multi-junction solar cells with small-scale organic rankine cycle

机译：小型有机朗肯循环集中多结太阳能电池集成

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In this paper, concentrated photovoltaic system using multiple (four) multi-junction solar cells with a refractive system for a single point focus Fresnel lens was developed to achieve high performance in terms of optical efficiency, uniformity (Peak average ratio value) and compactness. Geometric concentration ratio, F-number, focal length and height of homogenizer were investigated showing that at Geometric concentration ratio of 400x, F-number of 1.12, focal length of 632.5 mm and height of homogenizer of 50 mm, the concentrated photovoltaic achieves an optical efficiency and Peak average ratio value of 79.6% and 1.52 respectively. Active cooling was simulated in order to ensure effective operation of the multi-junction solar cells (operating temperature 110 degrees C) and to investigate the potential of exploiting the heat generated in the cells to operate an Organic Rankine Cycle to maximize the overall solar energy conversion efficiency. An Organic Rankine Cycle system with a target 1 kW power output is studied at different operating conditions and working fluid in order to be integrated with the Concentrated Photovoltaic Thermal system. Various configurations for integrating the Concentrated Photovoltaic Thermal units with the Organic Rankine Cycle working at various operating conditions and working fluids were investigated. Results showed that the integrated system with surface area of 16.8 m2, Organic Rankine Cycle system using R245fa can produce 6.17 kW of electricity with overall energy conversion efficiency of 46.57%. The developed system has the potential to provide the required electricity for buildings in Saudi Arabia which enjoys abundant solar radiation.
机译：在本文中，开发了使用多个（四个）多结太阳能电池的浓缩光伏系统，以实现单点聚焦菲涅耳透镜的折射系统，以在光学效率，均匀性（峰值平均值值）和紧凑性方面实现高性能。研究了几何浓度比，均质器的F数，焦距和高度，显示在几何浓度比为400x，f数为1.12，焦距为632.5mm，均化器的高度为50mm，浓缩的光伏达到光学效率和峰值平均值值分别为79.6％和1.52。模拟了主动冷却，以确保多结太阳能电池的有效操作（操作温度<110℃）并研究利用电池中产生的热量的电位，以操作有机朗肯循环，以最大化整体太阳能能量转换效率。在不同的操作条件和工作流体上研究了具有目标1kW功率输出的有机朗肯循环系统，以与浓缩的光伏热系统集成。研究了用于将浓缩光伏热单元与在各种操作条件下工作的有机朗朗循环集成的各种配置。结果表明，具有16.8平方米，使用R245FA的有机朗肯循环系统的综合系统可以产生6.17kW的电力，整体能量转换效率为46.57％。发达的系统有可能为沙特阿拉伯建筑提供所需的电力，这享有丰富的太阳辐射。

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