Heat flux (HF) distribution around the receiver tube of parabolic trough collectors (PTC) has a crucial effect on their outlet temperature ($T_o$) and thermal efficiency (${\eta }_{th}$). Since its receiver tube is as a heat exchanger, the higher amounts of ${\eta }_{th}$can be achieved by changing the geometry of the receiver tube. In previous researches, the geometrical variations were made in the internal geometry of the receiving tube, such as the use of corrugated paths, the installation of fins, using porous media, using twisted tape, etc. In this work, changes are simultaneously made in the internal and external geometry of the receiving tube, which is for the first time based on the model of HF distribution around the receiver tube. These changes include us$V_{\eta }$ing and moving the receiver's central plug, and creating concavities on the receiver tube to augment the contact surface of the wall with the internal working fluid. These concavities are created in regions of the tube that have a higher heat transfer to increase the heat transfer rate as a fin. In order to generate various HFs around the receiver tube and consequently create different arrangements of fins, two types of PTCs have been used in this research. To compare the improvement of each case-studies rather than smooth case, two indices of efficiency-based ($V_f^{Nu}$) and two-objective evaluation () are defined. Finally the results show that, in view point of $V_{\eta }$ index, PTC with three-piece reflector and also with the central plug as well as the big fins can give the optimum results than the other case-studies. On the other hand, considering the index of $V_f^{Nu}$, the conventional PTC with E.F = 2/3 and the big fins can give the optimum results.

抛物槽式集热器（PTC）的接收管周围的热通量（HF）分布对其出口温度有至关重要的影响（${Ť}_{Ø}$）和热效率（${\eta }_{ŤH}$）。由于其接收管用作热交换器，因此${\eta }_{ŤH}$可以通过改变接收管的几何形状来实现。在先前的研究中，接收管的内部几何形状发生了几何变化，例如使用波纹路径，安装散热片，使用多孔介质，使用扭曲的胶带等。在这项工作中，同时进行了更改。接收管的内部和外部几何形状，这是首次基于接收管周围的HF分布模型。这些变化包括我们$V_{\eta }$旋转并移动接收器的中心插头，并在接收器管上形成凹面，以增加壁与内部工作流体的接触面。这些凹部在管中具有较高热传递的区域中产生，以增加作为翅片的热传递速率。为了在接收管周围产生各种HF并因此形成不同的散热片布置，本研究中使用了两种类型的PTC。为了比较每个案例研究（而不是平滑案例）的改进，基于效率的两个指标（$V_F^{ñü}$）和两个目标评估（）。最后的结果表明，从$V_{\eta }$与其他案例研究相比，具有三片式反射器，中央塞子和大鳍片的PTC可以提供最佳结果。另一方面，考虑$V_F^{ñü}$，EF  = 2/3的传统PTC和大鳍片可以提供最佳结果。