Improving performance of parabolic through collectors is one of the challenges in thermal application of solar energy. Nanofluids are one of the most effective methods that are used for heat transfer enhancement in the absorber of parabolic through collectors. Also, corrugated tubes can increase turbulence intensity and therefore heat transfer can experience a remarkable improvement. In this study, the effects of Al₂O₃/water nanofluid at volume fractions of 0.25-1% and helically corrugated absorber tubes with the pitch length of 3-7 mm and roughness height of 0.5-1.5 mm are investigated on the thermal behavior of a parabolic trough collector (PTC). All tests have been conducted under ASHRAE standard (93:2010). The results demonstrated an increase of about 219.56% in Nusselt number. In comparison, they showed an increase around 145.5% in friction factor. Also, at 1% vol. Al₂O₃/water nanofluids, the thermal performance factor reached the maximum value of 2.53% at the pitch length of 3 mm and roughness height of 1.5 mm.

通过集热器提高抛物线性能是太阳能热应用的挑战之一。纳米流体是用于通过集热器的抛物线吸收器中增强传热的最有效方法之一。此外，波纹管可以增加湍流强度，因此传热可以得到显着改善。在本研究中，Al ₂ O _{3 的影响}研究了体积分数为 0.25-1% 的 /water 纳米流体和节距长度为 3-7 mm 和粗糙度高度为 0.5-1.5 mm 的螺旋波纹吸收器管的抛物线槽收集器 (PTC) 的热行为。所有测试均按照 ASHRAE 标准 (93:2010) 进行。结果表明，努塞尔数增加了约 219.56%。相比之下，它们的摩擦系数增加了约 145.5%。此外，在 1% vol。Al ₂ O ₃ /水纳米流体，在节距长度为3 mm、粗糙度高度为1.5 mm时，热性能因子达到最大值2.53%。