The objective of this work is to investigate the thermal enhancement margin with the implementation of (Syltherm 800/Cu) nanofluid in parabolic trough collectors in a systematic way. Three different collector kinds are studied; the evacuated tube receiver, the non-evacuated tube receiver and the bare tube without cover. The study is a systematic parametric investigation for different values of the following parameters: ambient temperature, solar irradiation, solar angle, wind speed, flow rate, inlet temperature, absorber emittance and nanoparticle concentration. Moreover, this study is performed by developing a mathematical model in Engineering Equation Solver which is validated with literature experimental data. The results indicate that the maximum enhancements are found for the cases with higher thermal losses and also the use of nanofluids enhances most of the performance in the bare tube. The maximum enhancements are found in small flow rates and for the cases with higher emittance. The maximum enhancement was found at 7.16% for the bare tube, 4.87% for the non-evacuated receiver and 4.06% for the evacuated receiver when the flow rate is 25 L/min and there is a cermet coating. The respective enhancement values are 17.11%, 12.30% and 12.24% for 25 L/min and for a non-selective absorber.

这项工作的目的是系统地研究在抛物线槽式集热器中实施（Syltherm 800 / Cu）纳米流体的热增强裕度。研究了三种不同的收集器类型：真空管接收器，非真空管接收器和无盖裸管。该研究是对以下参数的不同值的系统参数研究：环境温度，太阳辐射，太阳角，风速，流速，入口温度，吸收剂发射率和纳米粒子浓度。此外，这项研究是通过在工程方程求解器中建立数学模型进行的，该模型已通过文献实验数据进行了验证。结果表明，对于具有更高热损失的情况，可以找到最大的增强，并且纳米流体的使用可以增强裸管中的大多数性能。在小流量下以及发射率更高的情况下，可以发现最大的增强。当流速为25 L / min且有金属陶瓷涂层时，裸露管的最大增强为7.16％，未抽空的接收器为4.87％，抽空的接收器为4.06％。对于25 L / min和对于非选择性吸收剂，各自的增强值为17.11％，12.30％和12.24％。当流量为25 L / min且有金属陶瓷涂层时，真空接收器的压力为06％。对于25 L / min和对于非选择性吸收剂，各自的增强值为17.11％，12.30％和12.24％。当流量为25 L / min且有金属陶瓷涂层时，真空接收器的压力为06％。对于25 L / min和对于非选择性吸收剂，各自的增强值为17.11％，12.30％和12.24％。