This work proposes distinct configurations for tubular photobioreactors (PBRs) illuminated with specific and adequate light wavelength provided by LEDs. The PBRs are characterized by an involute/flat reflective surface around/below a cylindrical borosilicate glass tube that is illuminated by a LEDs panel located above. Reflectors can enlarge the absorber tube's illuminated area, enabling a uniform (spatial and temporal) light distribution across the culture vessel. Additionally, high-energy-efficient LEDs can minimize heat generation and energetic-related costs. Coupling these two factors can result in higher light utilization efficiency and photosynthetic activity. Depending on the reflector design, almost all the light arriving at the collector aperture can be collected and available for microalgal cultivation. Chlorella vulgaris (C. vulgaris) growth was evaluated as a function of the reflector geometry (flat (F), simple double parabola (SP) and traditional double parabola (DP)) and material (anodized aluminum with (MS) and without (R85) protective coating and stainless steel (SS)). C. vulgaris growth as a function of time was found to be in good agreement with the actinometric results, where the parabolic reflectors (SP and DP) made of higher specular reflectance materials (R85 and MS) were the most efficient systems. Conversely, energy-based specific growth rates slightly increased as the photon flux decreased, signaling an energetic efficiency loss due to the low transmissibility of microalgal suspensions. Additional tests using two absorber tubes (spaced between 12.5 and 75.0 mm) over the R85-F reflector were also carried out, showing that the distance of 50.0 mm led to the best compromise between the specific growth rates and biomass productivities per square meter of solar collector. Under these conditions, higher efficiency on the photonic energy usage was attained compared to the single-tube test.

这项工作为管状光生物反应器 (PBR) 提出了不同的配置，用 LED 提供的特定和足够的光波长照明。PBR 的特点是在圆柱形硼硅酸盐玻璃管周围/下方具有渐开线/平坦反射表面，该玻璃管由位于上方的 LED 面板照明。反射器可以扩大吸收管的照明区域，使整个培养容器的光分布均匀（空间和时间）。此外，高能效 LED 可以最大限度地减少热量产生和能源相关成本。将这两个因素结合起来可以导致更高的光利用效率和光合活性。根据反射器的设计，几乎所有到达收集器孔径的光都可以被收集并用于微藻培养。小球藻( C. vulgaris ) 的生长被评估为反射器几何形状（平面 (F)、简单双抛物线 (SP) 和传统双抛物线 (DP)）和材料（带 (MS) 和不带 (R85) 的阳极氧化铝) 保护涂层和不锈钢 (SS))。C. vulgaris发现作为时间函数的增长与光度计结果非常一致，其中由较高镜面反射率材料（R85 和 MS）制成的抛物面反射器（SP 和 DP）是最有效的系统。相反，随着光子通量的减少，基于能量的比生长速率略有增加，表明由于微藻悬浮液的低传输率导致能量效率损失。还使用 R85-F 反射器上方的两个吸收管（间距在 12.5 和 75.0 毫米之间）进行了额外的测试，表明 50.0 毫米的距离导致比生长速率和每平方米太阳能的生物质生产力之间的最佳折衷。集电极。在这些条件下，与单管测试相比，光子能量使用效率更高。