Strategies to improve the thermal performance of solar collectors

IF 4.3 3区 工程技术 Q1 MECHANICS Journal of Non-Equilibrium Thermodynamics Pub Date : 2024-01-05 DOI:10.1515/jnet-2023-0040
Bader Alshuraiaan
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Abstract

The paper evaluates a passive method for heat transfer improvement in heat exchangers, which implies the use of nanofluids. All calculations were carried out with a constant volumetric flow rate. The study examines three fluids with 0–4 % volume concentrations of CuO, MgO, and Al2O3 particles. The results indicate an increase in the heat transfer coefficient with increasing temperature. An Al2O3 nanofluid (4 % concentration) contributed to the best thermal performance. The incorporation of a 4 % content of MgO yielded an augmentation in heat transfer ranging from 15 % to 22 %, whereas an analogous concentration of CuO led to a more substantial enhancement of 25 %. Notably, the introduction of nanoparticles of Al2O3 produces a remarkable augmentation in heat transfer performance, with potential improvements of up to 36 %. The Nusselt number increases with increasing particle volume fraction and Reynolds number, according to results obtained for several nanoparticles (Al2O3, CuO, SiO2, and ZnO) with volume percentages in the range of 1–4 % and nanoparticle diameters of 25–70 nm. For all nanofluids, the time-averaged Nusselt number rises with a solid phase volume fraction increase of less than 5 %.
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提高太阳能集热器热性能的策略
本文评估了一种用于改善热交换器传热的被动方法,这意味着纳米流体的使用。所有计算都是在恒定体积流量下进行的。研究考察了三种流体,其氧化铜、氧化镁和氧化铝颗粒的体积浓度分别为 0-4%。结果表明,传热系数随温度升高而增大。Al2O3 纳米流体(浓度为 4%)的热性能最佳。加入 4% 浓度的氧化镁后,传热系数提高了 15% 至 22%,而类似浓度的氧化铜则提高了 25%。值得注意的是,纳米 Al2O3 颗粒的引入显著提高了传热性能,其潜在改进幅度可达 36%。根据对几种纳米粒子(Al2O3、CuO、SiO2 和 ZnO)(体积百分比范围为 1-4%,纳米粒子直径为 25-70 nm)的研究结果,努塞尔特数随着粒子体积百分比和雷诺数的增加而增加。对于所有纳米流体,当固相体积分数增加小于 5%时,时间平均努塞尔特数都会上升。
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来源期刊
CiteScore
9.10
自引率
18.20%
发文量
31
审稿时长
1 months
期刊介绍: The Journal of Non-Equilibrium Thermodynamics serves as an international publication organ for new ideas, insights and results on non-equilibrium phenomena in science, engineering and related natural systems. The central aim of the journal is to provide a bridge between science and engineering and to promote scientific exchange on a) newly observed non-equilibrium phenomena, b) analytic or numeric modeling for their interpretation, c) vanguard methods to describe non-equilibrium phenomena. Contributions should – among others – present novel approaches to analyzing, modeling and optimizing processes of engineering relevance such as transport processes of mass, momentum and energy, separation of fluid phases, reproduction of living cells, or energy conversion. The journal is particularly interested in contributions which add to the basic understanding of non-equilibrium phenomena in science and engineering, with systems of interest ranging from the macro- to the nano-level. The Journal of Non-Equilibrium Thermodynamics has recently expanded its scope to place new emphasis on theoretical and experimental investigations of non-equilibrium phenomena in thermophysical, chemical, biochemical and abstract model systems of engineering relevance. We are therefore pleased to invite submissions which present newly observed non-equilibrium phenomena, analytic or fuzzy models for their interpretation, or new methods for their description.
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