Purpose

Present investigation conducts a study on the hydrothermal features of a double flow Parabolic Trough Solar Collector (PTSC) equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert filled with nanofluid. This paper aims to present an effectual PTSC which is comprised by nanofluid numerically by means of finite volume method.

Design/methodology/approach

The beneficial results such as pressure drop inside the absorber tube, mean predicted friction factor, predicted average Nusselt number and hydrothermal Performance Evaluation Criteria (PEC) are evaluated and reported to present the influences of numerous factors on studied interest outcomes. Effects of different Reynolds numbers and environmental conditions are also determined in this investigation.

Findings

It is found that using the absorber roof (canopy) can enhance the heat transfer ratio of PTSCs significantly during all studied Reynolds numbers. Also, it is realized that the combination of inner grooved surface, outer corrugated surface and inserting turbulator can improve the thermal-hydraulic characteristics of PTSCs sharply.

Originality/value

Novel PTSC (N.PTSC) filling with two Heat Transfer Fluids (HTFs), inner and outer surface corrugated absorber tube, absorber roof and inserting twisted tape (N.PTSC.f) has the highest PEC values among all novel configurations along all investigated Reynolds numbers which is followed by configurations N.PTSC with two HTFs and inserting twisted tape (N.PTSC.e), N.PTSC with two HTFs and outer surface corrugated absorber tube (N.PTSC.b) and N.PTSC with two HTFs and inner surface corrugated absorber tube (N.PTSC.c), respectively. N.PTSC.f Nusselt number values can overcome the high values of friction factor, and therefore is introduced as the most efficient model in the current study.

中文翻译：

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装有正弦波槽吸收管和扭带插入件的双流抛物线槽式太阳能集热器的水热特性

目的

本研究对配备正弦波槽吸收器管和填充有纳米流体的扭曲带插入物的双流抛物槽太阳能集热器 (PTSC) 的热液特征进行了研究。本文旨在通过有限体积法在数值上提出一种由纳米流体组成的有效PTSC。

设计/方法/方法

评估并报告了吸收器管内压降、平均预测摩擦系数、预测平均努塞尔数和水热性能评估标准 (PEC) 等有益结果，以展示多种因素对研究兴趣结果的影响。本次调查还确定了不同雷诺数和环境条件的影响。

发现

发现在所有研究的雷诺数期间，使用吸收器屋顶（顶篷）可以显着提高 PTSC 的传热率。此外，还认识到内凹槽表面、外波纹表面和插入湍流器的组合可以显着改善PTSC的热工水力特性。

原创性/价值

新型 PTSC (N.PTSC) 填充有两种传热流体 (HTF)、内表面和外表面波纹吸收器管、吸收器顶部和插入扭曲带 (N.PTSC.f) 在所有研究的所有新型配置中具有最高的 PEC 值雷诺数后面是配置 N.PTSC 和两个 HTF 并插入双绞带 (N.PTSC.e)、N.PTSC 和两个 HTF 和外表面波纹吸收管 (N.PTSC.b) 和 N.PTSC 两个分别为 HTF 和内表面波纹吸收器管 (N.PTSC.c)。N.PTSC.f Nusselt 数值可以克服摩擦系数的高值，因此作为当前研究中最有效的模型被引入。