Ag - NPs-rGO混合纳米流体直接吸收太阳能集热器的原位性能研究

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-05-13 DOI:10.1016/j.csite.2025.106330

Angel Huminic, Gabriela Huminic

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引用次数: 0

摘要

近年来，由于新材料和工作流体的不断发展，直接吸收式太阳能集热器（DASCs）的研究总体呈上升趋势，这为其在太阳能转化为热能方面的性能提供了改进的机会。使用纳米流体作为吸附剂和导热介质已被证明是提高这些集热器有效性的有效方法，主要是由于与典型的工作流体（如水、乙二醇或油）相比，纳米流体具有更高的光学特性，特别是吸收率，而典型的工作流体对阳光的吸收较弱。在本研究中，使用CFD设计和优化了DASC原型，随后在水-乙二醇溶液中使用Ag NPs + rGO混合纳米流体制造和测试。为了评价纳米颗粒的效果，我们同时对两个DASC进行了实验，第二个DASC被简单的水-乙二醇溶液填充，并作为参考DASC。为了获得相关数据，在夏季的室外条件下进行了调查，对几种具有代表性的工作流体流速进行了调查。结果表明，采用混合纳米流体后，DASC的效率显著提高，最大相对增强率为74.1%。此外，瞬时能量和累积能量分别比使用水-乙二醇溶液的DASC高44%和98%。根据所收集的数据，提出了努塞尔数的相关关系。

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In situ performances of direct absorption solar collector based on Ag NPs-rGO hybrid nanofluid

Recent research on direct absorption solar collectors (DASCs) follows a general upward trend due to continuous development of new materials and working fluids, which provide opportunities for improvement of their performances regarding conversion of solar energy into thermal energy. Using of nanofluids as absorbent and heat-conducting media has proven to be an efficient method to increase the effectiveness of these collectors, mainly due to higher optical properties, particularly absorption, compared to typical working fluids, e.g. water, ethylene-glycol or oil, which absorb weakly the sunlight. In this study, a DASC prototype has been designed and optimized using CFD, and later fabricated and tested using Ag NPs + rGO hybrid nanofluid in water-ethylene glycol solution. To evaluate the effect of the nanoparticles, experiments were simultaneously carried out for two DASCs, the second one being filled with simple water-ethylene glycol solution, and used also as reference DASC. In order to achieve relevant data, the investigations were performed under outdoor conditions during summer season, for several representative flow rates of the working fluid. The results show that the efficiency of DASC using hybrid nanofluid increases significantly, the maximum relative enhancement being 74.1 %. In addition, instantaneous and accumulative energies delivered are about 44 % and 98 % respectively higher than for DASC using water-ethylene glycol solution. Based on data collected, a correlation for Nusselt number is proposed.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.