Background

Parabolic trough solar collectors (PTSCs) are used to focus the solar rays on absorber tube. The main aim of this paper is to investigate the effects of applying novel corrugated absorber tube filled with hybrid nanofluid on energy efficiency of a novel double fluid PTSC to achieve the maximum energy efficiency value.

Method

The Eulerian-Eulerian two-phase model is employed for modelling the PTSC and evaluating its energy efficiency. Numerical study is carried out for different values of Reynolds number (Re), nanoparticles volume fraction (ϕ) and geometrical parameters of novel corrugated absorber tube.

Findings

It is found that usage of corrugated absorber tube has a significant effect on energy efficiency of single- or double fluid parabolic trough solar collectors. Besides it is understood that usage of double fluid system for collector with smooth channel can also increase the energy efficiency, but not more than using corrugated channel for single fluid collector. Moreover, usage of double fluid system at higher Re is also efficient. The results also show that the efficiency of the PTSC enhances with increasing the nanoparticles concentration. Finally, the optimum model of corrugated absorber tube is presented.

中文翻译：

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利用双流体系统和新型波纹吸收管评估填充混合纳米流体的抛物线槽式太阳能集热器的能效

背景

抛物槽式太阳能集热器 (PTSC) 用于将太阳光线聚焦在吸收管上。本文的主要目的是研究应用填充有混合纳米流体的新型波纹吸收器管对新型双流体 PTSC 能效的影响，以实现最大能效值。

方法

采用欧拉-欧拉两相模型对 PTSC 进行建模并评估其能效。对不同雷诺数( Re )、纳米颗粒体积分数(φ)和新型波纹吸波管几何参数进行了数值研究。

发现

研究发现，波纹吸收管的使用对单流体或双流体槽式太阳能集热器的能量效率有显着影响。另外据了解，采用光滑通道的双流体系统收集器也可以提高能源效率，但不会比单流体收集器使用波纹通道更多。此外，在较高Re 下使用双流体系统也是有效的。结果还表明，PTSC 的效率随着纳米颗粒浓度的增加而提高。最后，给出了波纹吸波管的优化模型。