The main objective of the present work is to investigate the morphology effects of Syltherm 800 oil-based \( \upgamma {\text{-AlOOH}} \) nanofluid on performance evaluation criterion (PEC) and energy efficiency of a novel parabolic trough solar collector (PTSC) numerically using finite volume method. The other goal is to compare the obtained results of nanofluid simulation in PTSC using single-phase mixture model (SPM) with two-phase mixture model (TPM). In addition, influences of using acentric absorber tube are determined. Consequently, in this step the optimum configuration is introduced and then different nanofluids characteristics such as volume fractions, nanoparticles diameters and shapes on the optimum configuration are investigated. Based on the obtained results, for all studied cases, obtained PEC and energy efficiencies employing the TPM in nanofluid simulation are more than that SPM simulation. Using the novel PTSC leads to the higher average Nusselt number, energy efficiency, PEC and outlet temperature at all Reynolds numbers. For all cases, the PEC and energy efficiency increase by reduction of nanoparticle volume fraction and diameter. As the Reynolds number increases, the energy efficiency of PTSC increases for all studied cases till Reynolds number equal to 5000 and then always reduces. Therefore, the optimum Reynolds number is 5000. The optimum morphology is related to the nanoparticles shape of blade which is followed by the brick, cylinders and platelet, respectively.

本工作的主要目的是研究Syltherm 800油基\（\ upgamma {\ text {-AlOOH}} \）的形态学影响有限体积法数值模拟一种新型抛物槽式太阳能集热器（PTSC）的性能评估标准（PEC）和能量效率的纳米流体。另一个目标是比较使用单相混合物模型（SPM）和两相混合物模型（TPM）在PTSC中获得的纳米流体模拟结果。另外，确定使用偏心吸收管的影响。因此，在这一步骤中，引入了最佳构型，然后研究了最佳构型上不同的纳米流体特性，例如体积分数，纳米颗粒直径和形状。根据获得的结果，对于所有研究的案例，在纳米流体模拟中使用TPM获得的PEC和能量效率均高于SPM模拟。使用新颖的PTSC会导致更高的平均Nusselt数，所有雷诺数的能量效率，PEC和出口温度。对于所有情况，PEC和能量效率都通过减小纳米粒子的体积分数和直径来提高。随着雷诺数的增加，在所有研究案例中，PTSC的能量效率都会提高，直到雷诺数等于5000，然后始终降低。因此，最佳雷诺数为5000。最佳形态与叶片的纳米颗粒形状有关，叶片的纳米颗粒形状依次为砖，圆柱和薄片。