The comparison of colloidal, optical, and solar collection characteristics between Fe2O3 and Fe3O4 nanofluids operated in an evacuated tubular volumetric absorption solar collector

Hosseini, Seyed Mohammad Sadegh; Dehaj, Mohammad Shafiey

doi:10.1016/j.jtice.2022.104381

Cited by 19 publications

(6 citation statements)

References 31 publications

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“…From this, it can be deduced that the nanoparticles are partially exfoliated. 15 In addition to the above, the stability of the exfoliated Ag was better than that without sonication because of chitosan. This polymer gives positive charges to the Ag sheets by adding multiple amino and hydroxyl groups, which causes repulsion between the sheets attracted to themselves by Van der Waals forces.…”

Section: Resultsmentioning

confidence: 92%

“…On the other hand, the change in concentration with the height of the exfoliated fluid could be explained by the fact that the smaller particles are still suspended while the larger ones settle. From this, it can be deduced that the nanoparticles are partially exfoliated 15. In addition to the above, the stability of the exfoliated Ag was better than that without sonication because of chitosan.…”

mentioning

confidence: 73%

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Optimizing the efficiency of solar thermal collectors and studying the effect of particle concentration and stability using nanofluidic analysis

Kandasamy

Jaganathan²,

Dhairiyasamy

et al. 2023

Energy & Environment

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The emission of greenhouse gases is widely acknowledged as the primary driver of global warming. The adoption of renewable energy sources is paramount to address the dependence on fossil fuels, which contribute significantly to this issue and account for 84.3% of current energy production. Solar thermal energy stands out as a prominent option, representing 54.1% of the world's solar energy derived from solar collectors. However, solar thermal energy encounters challenge due to the suboptimal thermal properties of the liquids used in these collectors. Incorporating particles into the liquids offers a potential solution to enhance absorption and thermal properties. Nanofluids, formed by reducing solid particles to nanoscale dimensions, provide an avenue for improvement. This study aimed to produce an Ag nanofluid through mechanical exfoliation and assess its impact on radiation absorption compared to a GO nanofluid. Under a simulated power of 1 unit, the Ag nanofluid demonstrated temperature differences of 4 to 7°C, while pure water showed no significant deviation. Moreover, the evaporation efficiency of the Ag nanofluid reached up to 40.8% for concentrations of 200 and 500 ppm, compared to 28.6% for pure water. These findings highlight the potential of Ag nanofluid as a promising option for direct absorption solar collectors, owing to its cost-effectiveness, low toxicity, and similar benefits to graphene. Incorporating nanofluids, particularly the Ag nanofluid produced through mechanical exfoliation, can significantly enhance the efficiency of direct absorption solar collectors.

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Section: Resultsmentioning

confidence: 92%

mentioning

confidence: 73%

Optimizing the efficiency of solar thermal collectors and studying the effect of particle concentration and stability using nanofluidic analysis

Kandasamy

Jaganathan²,

Dhairiyasamy

et al. 2023

Energy & Environment

View full text Add to dashboard Cite

show abstract

“…From this, it can be deduced that the nanoparticles are partially exfoliated. 12 In addition to the above, the stability of the exfoliated Ag was better than that without sonication because of chitosan. This polymer gives positive charges to the Ag sheets by adding multiple amino and hydroxyl groups, which causes repulsion between the sheets attracted to themselves by Van der Waals forces.…”

Section: Fluid Stabilitymentioning

confidence: 92%

Optimizing solar collector efficiency through nanofluid analysis and investigating the impact of particle concentration, and stability

Sivaraman,

Kolandaivel,

Murugesan

et al. 2023

Env Prog and Sustain Energy

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The emission of greenhouse gases contributes to global warming, and adopting renewable energy can mitigate the reliance on fossil fuels, which currently account for 84.3% of global energy production. Solar thermal energy represents a significant renewable energy source, with solar collectors contributing 54.1% of the world's solar energy. However, the thermal properties of the liquids used in these collectors are suboptimal, and adding particles to the fluid can enhance absorption and thermal characteristics. Nanofluids refer to solid particles reduced to nanoscale sizes, and this study focuses on producing an Ag nanofluid through mechanical exfoliation and its comparative analysis with a GO nanofluid regarding radiation absorption. The results indicate that the Ag nanofluid outperforms pure water and performs similarly at lower concentrations. Specifically, temperature differences of 4–7°C were observed for a simulated power of 1 unit, while the evaporation efficiency reached up to 40.8% for 200 and 500 ppm concentrations, compared to 28.6% for pure water. Moreover, under a radiation intensity of 60 units, the Ag nanofluid achieved the boiling temperature of the water after 85 s. In contrast, GO required at least 250 s, and pure water did not reach the boiling temperature within the 6‐min study period. Thus, the Ag nanofluid holds promise as an effective nanofluid for direct absorption solar collectors due to its affordability, low toxicity, and comparable benefits to graphene.

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“…They refrained from using surfactants to avoid potential electromagnetic and rheological impacts on the solar thermal conversion process. In a related study, Hosseini and Dehaj [ 75 ] prepared Fe 2 O 3 /water and Fe 3 O 4 /water NFs by employing more powerful sonication (probe ultrasonicator at 300 W) and incorporating the surfactant sodium dodecylbenzene sulfonate (SDBS) with a neutral pH to improve colloidal behaviour. Afterwards, the mixture was re-sonicated using a bath-type sonicator.…”

Section: Nanoparticles Used For Dasc Nanofluidsmentioning

confidence: 99%

“…The NFs reached a maximum thermal efficiency of 65% at the highest concentration of 2 wt%, while the lowest concentration of 0.5 wt% achieved 8%. In another similar work [ 75 ] Fe 2 O 3 /water NFs were used in an evacuated tubular DASC made of a borosilicate glass tube of 140 cm in length and containing a smaller glass tube of 2.5 cm and 4 cm inner and outer diameters, respectively. The flow rate was 400 mL/min (Reynold number of 340) and a surface area of 0.055 cm 2 was exposed to solar radiation.…”

Section: Characterization Of the Stability Of Nanofluids For Dasc App...mentioning

confidence: 99%

Nanofluids for Direct-Absorption Solar Collectors—DASCs: A Review on Recent Progress and Future Perspectives

et al. 2023

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Owing to their superior optical and thermal properties over conventional fluids, nanofluids represent an innovative approach for use as working fluids in direct-absorption solar collectors for efficient solar-to-thermal energy conversion. The application of nanofluids in direct-absorption solar collectors demands high-performance solar thermal nanofluids that exhibit exceptional physical and chemical stability over long periods and under a variety of operating, fluid dynamics, and temperature conditions. In this review, we discuss recent developments in the field of nanofluids utilized in direct-absorption solar collectors in terms of their preparation techniques, optical behaviours, solar thermal energy conversion performance, as well as their physical and thermal stability, along with the experimental setups and calculation approaches used. We also highlight the challenges associated with the practical implementation of nanofluid-based direct-absorption solar collectors and offer suggestions and an outlook for the future.

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The comparison of colloidal, optical, and solar collection characteristics between Fe2O3 and Fe3O4 nanofluids operated in an evacuated tubular volumetric absorption solar collector

Cited by 19 publications

References 31 publications

Optimizing the efficiency of solar thermal collectors and studying the effect of particle concentration and stability using nanofluidic analysis

Optimizing the efficiency of solar thermal collectors and studying the effect of particle concentration and stability using nanofluidic analysis

Optimizing solar collector efficiency through nanofluid analysis and investigating the impact of particle concentration, and stability

Nanofluids for Direct-Absorption Solar Collectors—DASCs: A Review on Recent Progress and Future Perspectives

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