Abstract Enhancement of solar intensity is achieved through concentrator which focuses direct normal irradiance to a smaller area. Such redirection necessitates aligned movement of the whole assembly along the apparent motion of the sun. The motion of a bulky system consumes significant power during the operation, thereby reducing the effective energy collection efficiency. Therefore, a static geometry which does not require tracking the sun is desirable as concentrating optics. Here, we propose such a novel static concentrator based on cylindrical Fresnel lens. Only the absorber is given a single axis tracking motion. A systematic optimization is performed to select the geometrical parameters which maximize the solar intensity and minimize the intensity-non-uniformity. For a Silicone glass cylinder of 20 cm diameter, we find an absorber of width 5 cm, placed at a distance of 11 cm from the axis of the concentrator provides the maximum intensity and the minimum intensity-non-uniformity when the vertex angle of the Frensel lens is 37°. The study demonstrates that the procedure to perform such geometry optimization is straightforwardly extendable. We demonstrate that the annual average intensity on the absorber can be enhanced by over ∼50% with lower operational cost and a meagre increase in the initial cost.

中文翻译：

---

一种新型固定式聚光器，可通过仅吸收器的单轴跟踪来增强太阳能强度

摘要 太阳能强度的增强是通过将直接法向辐照度聚焦到较小区域的聚光器来实现的。这种重定向需要整个组件沿着太阳的视运动对齐运动。庞大系统的运动在运行过程中会消耗大量功率，从而降低有效的能量收集效率。因此，不需要跟踪太阳的静态几何结构作为聚光光学器件是可取的。在这里，我们提出了一种基于柱面菲涅耳透镜的新型静态聚光器。只有吸收器被赋予单轴跟踪运动。执行系统优化以选择最大化太阳强度和最小化强度非均匀性的几何参数。对于直径为 20 厘米的硅胶玻璃圆筒，我们发现，当弗伦塞尔透镜的顶角为 37° 时，距离聚光器轴 11 厘米的宽度为 5 厘米的吸收器可提供最大强度和最小强度非均匀性。该研究表明，执行此类几何优化的程序可以直接扩展。我们证明了吸收器的年平均强度可以提高约 50% 以上，而运营成本更低，初始成本增加微不足道。