Despite the studies that have been done on boosting the performance of solar collectors, their efficiency is still not acceptable and therefore, it is necessary to provide new solutions to augment their performance. Therefore, in this numerical contribution, the thermal-hydraulic performance of parabolic trough solar collectors (PTSCs) has been improved by using two twisted tapes. The MgO-MWCNT (80%:20%)/thermal oil hybrid nanofluid is considered as the coolant. The numerical work is performed using the two-phase model. The effects of geometrical parameters, Reynolds numbers (Re), width and rotation directions of twisted tapes and nanoparticle volume fraction on the hydrothermal aspects of the PTSC are investigated. The most significant result obtained from the present study is to propose the best conditions in terms of geometry and volume fraction of nanoparticles employed for the practical utilization of twisted tape in PTSCs. The use of LCRW model at turbulator diameter of 15 mm filled with nanofluid at nanoparticle volume fraction of 2% was suggested as the optimum PTSC for Re < 30,873, while usage of LWRC model at turbulator diameter of 15 (mm) filled with nanofluid at nanoparticle volume fraction of 2% was suggested as the optimum PTSC for Re > 30,873.

尽管已经对提高太阳能集热器的性能进行了研究，但它们的效率仍然不可接受，因此有必要提供新的解决方案来提高它们的性能。因此，在此数值贡献中，抛物槽式太阳能集热器 (PTSC) 的热工水力性能已通过使用两个扭曲带得到改善。MgO-MWCNT (80%:20%)/热油混合纳米流体被认为是冷却剂。数值工作是使用两相模型进行的。研究了几何参数、雷诺数 (Re)、扭曲带的宽度和旋转方向以及纳米颗粒体积分数对 PTSC 水热方面的影响。从本研究中获得的最重要的结果是提出了在 PTSC 中实际利用扭曲带所采用的纳米粒子的几何形状和体积分数方面的最佳条件。建议使用 LCRW 模型在直径为 15 mm 的湍流器中填充纳米颗粒体积分数为 2% 的纳米流体作为 Re < 30,873 的最佳 PTSC，而在直径为 15 (mm) 的湍流器中使用 LWRC 模型填充纳米颗粒的纳米流体2% 的体积分数被认为是 Re > 30,873 的最佳 PTSC。