共查询到19条相似文献,搜索用时 156 毫秒
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可改善平面接收器能流均匀性的太阳能碟式聚光器设计 总被引:1,自引:0,他引:1
《光学学报》2020,(9)
为了改善平面接收器的能流均匀性,针对抛物碟式聚光器,提出一种重新优化布置各镜面单元的改进方法,并设计了一种新型非成像碟式聚光器。建立平面接收器目标区域内能流均匀化的优化模型,联合运动累加光线跟踪方法和遗传算法优化碟式聚光器。研究优化的聚光器与抛物碟式聚光器的聚焦能量分布,分析平面接收器上局部聚光比、非均匀因子、峰值聚光比及拦截效率指标。最后讨论了新型聚光器的应用价值,并展示了优化的新型碟式聚光器在平面型金属盘管接收器上的能流均匀化效果。结果表明,非成像碟式聚光器的能流均匀化效果最优异,能将非均匀因子从3.62~4.22显著减小到0.18~0.25,峰值聚光比从24737~37245降低到1722~2055。研究结果不仅能为太阳能平面接收器能流均匀化提供一种新的方法,还能为现有抛物碟式聚光器的改进提供新的思路。 相似文献
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旋转抛物面聚光器焦面能流分布的有限元分析 总被引:3,自引:3,他引:0
提出一种计算太阳能聚光器聚光焦斑能流密度分布的新方法。在考虑太阳形状、聚光器表面形状误差、跟踪误差、接收器位置误差、漫反射及接收器遮挡作用等各项光学误差和影响因素的基础上,结合旋转抛物面聚光器的光学特性,采用有限元法对焦面能流密度分布进行计算,并与文献中的结果进行比较,证明了该方法的正确性和可行性。同时又对半球形接收器和圆柱形接收器进行了实例计算,结果表明该方法不受聚光器或接收器面型的限制,算法简单,通用性也较强,从而为系统的优化设计和能流密度的测量奠定基础。 相似文献
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从原理上设计了一种反射聚焦式太阳能集热装置,利用凹面反射镜和菲涅耳透镜技术,将正射和反射的阳光大部投射到大球状透射镜上,再折射聚焦到位于球心中央的小球形吸热器中,将其中工质聚焦加热,变为高温流体,输入储热器;储热器预置多个接口,可同时吸收其他各套吸热器,或锅炉等排出的高温流体. 相似文献
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基于相同参数抛物镜面旋转阵列的太阳能槽式聚光器聚焦特性研究 总被引:1,自引:0,他引:1
提出了一种基于相同抛物镜面单元旋转阵列的低成本新型槽式聚光器。采用光线跟踪方法建立了该聚光器的光学分析模型,并详细研究了镜面焦距(f)、镜面宽度、平面接收器位置、旋转阵列半径(R1)和旋转阵列数量(N)等关键参数对其聚光性能的影响规律,为其设计与应用提供了重要依据。研究结果表明:新型槽式聚光器能很好地汇聚太阳光能,并且它不同于传统抛物槽式聚光器将平行光汇聚于某点,而是有所“分散”地进行汇聚,具备实现平面接收器上均匀聚焦能流分布的潜力;聚焦光斑的合理接收位置会随旋转阵列半径的改变而变化,通常接收器位于旋转阵列半径的一半位置是合适的,但要获得最小聚焦光斑则需将其下移150~200 mm;聚焦光斑宽度随镜面编号呈指数增大关系,特别是当镜面宽度较大且旋转阵列半径较小时;旋转阵列半径越大或镜面宽度越小,聚焦能流分布越集中且峰值聚光比越大(算例中已达到50),此时聚焦能流基本呈高斯分布特征。此外,采用较小旋转阵列半径可降低接收器的安装高度并改善能流均匀性。在算例中,当f=8000 mm、R1=4000 mm、N=5且接收器位于1830 mm位置时,聚焦光... 相似文献
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为了解决太阳光经传统菲涅尔聚光镜聚光后太阳能电池接收面上的光强分布不均匀问题,设计了一种环带式菲涅尔聚光镜。根据菲涅尔环带设计方法,把接收面划分为与之对应的环带,使光线在经过菲涅尔聚光镜的表面环带后进入相应的接受面环带,减少了光能损失并提高了光强分布均匀性。给出了在350 nm ~760 nm波段范围内太阳张角角度为0.54°、口径200 mm、高宽比为0.65、聚光比为400的菲涅尔聚光系统设计实例,通过Tracepro模拟并分析了菲涅尔聚光镜的光学能力。结果表明:在接收面尺寸相同的情况下与参数相同的的传统匀光菲涅尔聚光镜相比,此环带菲涅尔透镜光斑能量分布均匀性达到75%。 相似文献
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We designed a high-efficiency dispersive mirror based on multi-layer dielectric meta-surfaces. By replacing the secondary mirror of a dome solar concentrator with this dispersive mirror, the solar concentrator can be converted into a spectrum-splitting photovoltaic system with higher energy harvesting efficiency and potentially lower cost. The meta-surfaces are consisted of high-index contrast gratings (HCG). The structures and parameters of the dispersive mirror (i.e. stacked HCG) are optimized based on finite-difference time-domain and rigorous coupled-wave analysis method. Our numerical study shows that the dispersive mirror can direct light with different wavelengths into different angles in the entire solar spectrum, maintaining very low energy loss. Our approach will not only improve the energy harvesting efficiency, but also lower the cost by using single junction cells instead of multi-layer tandem solar cells. Moreover, this approach has the minimal disruption to the existing solar concentrator infrastructures. 相似文献
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The spectroscopic properties of a coumarin derivative dye (macrolex fluorescent red G) impregnated in a poly(methylmethacrylate)/silica hybrid matrix were studied. The stability of the hybrid against both light irradiation and raised temperature showed excellent weathering durability for use in fluorescent solar concentrator (FSC) applications. A new geometry for FSCs was introduced, which we call a “bent plate configuration”. Each BFSC plate was manufactured as two rectangles forming two sides of a triangle to optimize receiving both direct and reflected solar energy. The effect of the concentrator apex angle on solar energy conversion was studied. The optimum apex angle was found to correlate well to the location latitude. 相似文献
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Teuku Azuar Rizal Muhammad Amin Syamsul Bahri Widodo Nazaruddin Abdul Rachman Fazri Amir Nurhalim Pane Teuku Meurah Indra Mahlia 《Entropy (Basel, Switzerland)》2022,24(1)
Indonesia has been blessed with excellent solar heat distribution, which can be used as renewable energy to heat water. Various technologies have been developed to utilize these inexhaustible thermodynamic resources, in the form of photons arrays, converted into concentrated heat for daily use, i.e., solar water heater. This renewable-based water heating system can provide significant energy efficiency, benefit the environment, and reduce energy use costs. This experimental study attempts to harvest the energy from the sun using a cylindrical through collector (CTC) type solar concentrator. The CTC was made of the solar reflective film (SRF) affixed to concentrator collector surfaces which was then mounted on an adjustable angle frame of the concentrator collector support. The heat generated from the concentrator was stored in water, and phase change material is embedded in the system to retain the heat longer. The research was carried out in Langsa City, Aceh, Indonesia. The results showed that water heaters using CTC systems could produce 16 L of hot water retained at 40–60 °C for four hours. With the addition of beeswax, the water temperature of the same capacity can be maintained at 40–60 °C for around 5 h. This technology demonstrated an excellent result that produces as much as 60 L of water per day, increasing solar thermal energy efficiency. This technology presented a great potential for replication or even for further development on an industrial scale. 相似文献
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提出了充分利用灯具空间,具有单体双向多功能的光学设计新理念。结合LED与CPC,根据光学扩展量守恒,借助光路可逆原理与边缘光线原理,构造矩形复合抛物面。根据我国最新的《读写作业台灯性能要求》GB/T 9473-2017,以出光口半宽、台灯辐照高度、截短后杯体长度比为3个因素,设计正交实验,确定台灯矩形复合抛物面最适合参数为:出光口半宽50 mm、最大进光半角47.73°、截取杯体长度36 mm。在照明方面,该矩形复合抛物面能够满足关于A、AA级的照度和照度均匀度要求;在弱光聚集方面,其太阳能芯片位置的照度是不经聚光情况的1.25倍;在聚光模式下,太阳能芯片的光伏转化效率是非聚光模式下的1.66倍。这是对当前市面上非聚光模式收集太阳能方式的补充。 相似文献
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太阳能帆板平面度测量系统中光斑图像处理方法研究 总被引:1,自引:0,他引:1
太阳能帆板的平面度测量是卫星生产制造过程中的一个关键技术,现有的测量方法存在着精度差,效率低的问题。该文在基于实际工程课题的太阳能帆板平面度测量系统基础上,针对测量系统中光斑图像处理这一关键技术进行了详细的研究。对现有测量方法进行了比较与分析,介绍了测量系统的基本原理、图像采集系统设计过程中采取的主要措施、图像处理的具体方法与步骤和测量系统的基本组成。提出了一种新的快速滤波算法和光斑图像能量中心求取算法,大大提高了光斑图像能量中心的求取精度和实时性,提高了太阳能帆板平面度的测量精度。给出了光斑图像处理结果、静态测量重复性误差以及实际帆板的测量结果与分析,实验结果证明所采用的光斑图像处理方法可以满足对实际帆板测量精度的要求。 相似文献
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We present a novel off-axis XR concentrator design that enables a high efficiency energy collection while avoiding the shadowing problem encountered in the designs of symmetry XR type concentrator. Combining with a 1 cm2 multi-junction solar cell, the off-axis XR concentrator is able to achieve high optical efficiency of the photovoltaic system. The concentrator design is performed based on the non-imaging optic principle, with one reflective mirror (X) and one refractive lens (R). Both surfaces of the reflective and refractive element are of freeform shapes and fitted as freeform expression in the design analysis. The concentrator has concentration ratio greater than 500× and acceptance angle greater than 2°. A square homogenizing irradiance distribution on the cell is achieved with the help of a suitable rob. The tolerance of the system is analyzed. The results show that the high concentration ratio and greater acceptance angle relax all optical and mechanical tolerances reduce the production and operation cost. 相似文献