Department of Mechanical Engineering, Atma Malik Institute of Technology and Research, Shahapur, Thane, 421603, Maharashtra, India.
Department of Mechanical Engineering, Velammal Engineering College, Chennai, 600 066, Tamil Nadu, India.
Environ Sci Pollut Res Int. 2024 Jan;31(3):4764-4778. doi: 10.1007/s11356-023-31428-1. Epub 2023 Dec 18.
This work focuses on meeting the growing demand in solar energy conversion for small-scale applications. In this regard, experimental and CFD research has been done to examine the thermal performance (energy and exergy efficiencies) of a dish collector (reflector and receiver) system with different receiver models. In this work, receivers with uniform absorber cavity areas having cylindrical and hemispherical shapes were modeled for length-to-diameter ratios (L/D) of 1.5, 1, and 0.75. The modeled receivers having coil tube configurations concerning the geometrical shape of the models were tested with two different materials of aluminum and copper. The performance of the receiver models was compared by experimental and CFD methods for the average solar direct normal irradiations of 860 W/m by the dish reflector area of almost 12 m. The supplied average heat flux by the dish reflector was 7 kW/m at the absorbing area of the cavity receivers. The energy and exergy efficiencies from the experimental and CFD analyses on the models were determined based on the cavity surface temperature distribution of receiver walls, and heat gain for different mass flow rates by the heat transfer fluid water. The receiver with copper material and L/D ratio of 0.75 has been found as the optimized one among all other models with the maximum obtained energy and exergy efficiencies of 73.64 and 7.31% when water is used as the heat transfer fluid. The performance of the optimized receiver model was also validated with a few other heat transfer fluids such as SiC + water nanofluid and therminol VP1.
这项工作专注于满足小型应用太阳能转换日益增长的需求。在这方面，已经进行了实验和 CFD 研究，以检查具有不同接收器模型的碟形集热器（反射器和接收器）系统的热性能（能量和火用效率）。在这项工作中，对具有圆柱形和半球形均匀吸收腔面积的接收器进行建模，长度与直径比（L/D）分别为 1.5、1 和 0.75。针对模型的几何形状，对具有盘管管配置的模型接收器进行了测试，采用了两种不同的材料，即铝和铜。通过实验和 CFD 方法对接收器模型的性能进行了比较，碟形反射器的平均太阳直接法向辐照度为 860 W/m，碟形反射器的面积几乎为 12 m。腔接收器的吸收面积上的碟形反射器提供的平均热通量为 7kW/m。根据腔壁接收器的腔表面温度分布以及不同质量流量下的传热流体水的热增益，从模型的实验和 CFD 分析中确定了能量和火用效率。对于所有其他模型，使用铜材料和 L/D 比为 0.75 的接收器被发现是优化的，当使用水作为传热流体时，获得的最大能量和火用效率分别为 73.64%和 7.31%。还使用其他几种传热流体（例如 SiC+水纳米流体和 therminol VP1）对优化后的接收器模型的性能进行了验证。
