Experimental study on the solar drying of Rhubarb (Rheum ribes L.) with parabolic trough collector assisted with air recycling system, nanofluid and energy storage system

Akhijahani, Hadi Samimi; Salami, Payman; Iranmanesh, Masoud; Jahromi, Mohammad Saleh Barghi

doi:10.1016/j.est.2022.106451

Cited by 21 publications

(5 citation statements)

References 70 publications

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“…It can be attached to the surface of the Ag nanosheets, which have negative charges on their surface due to sulfur atoms (−0.25e) while the molybdenum atom is inside with a positive charge (+0.5e). Due to the negative charge on the surface of sulfur atoms and the positive charge of chitosan, it can be added to the surface of the layers 14 . This polymer produces positive charges when attached to the surface of the Ag nanosheets, causing electrostatic repulsion between the sheets, preventing them from agglomerating and providing stability in the solution.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the negative charge on the surface of sulfur atoms and the positive charge of chitosan, it can be added to the surface of the layers. 14 This polymer produces positive charges when attached to the surface of the Ag nanosheets, causing electrostatic repulsion between the sheets, preventing them from agglomerating and providing stability in the solution.…”

Section: Diffraction (Xrd)mentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Diffraction (Xrd)mentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Due to the negative charge on the surface of sulfur atoms and the positive charge of chitosan, it can be added to the surface of the layers. 17 This polymer produces positive charges when attached to the surface of the Ag nanosheets, causing electrostatic repulsion between the sheets, preventing them from agglomerating and providing stability in the solution. These repulsive forces between particles dominate when the solution is diluted with ions.…”

Section: Diffraction (Xrd)mentioning

confidence: 99%

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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“…The outcomes indicate that the global efficiency of vacuumed receiver is 11% better than the bare receiver efficiency. Akhijahani et al 162 tested experimentally the thermal and economical changes of dried slices of Rhubarb along with PTC for mechanism of air recycling. Al 2 O 3 of 3.75% concentration was used as heat conveying liquid.…”

Section: Ptc Based On Different Types Of Nanofluidmentioning

confidence: 99%

Energy, exergy, environment and techno-economic analysis of parabolic trough collector: A comprehensive review

Chakraborty,

Roy,

Debnath

et al. 2023

Energy & Environment

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Inexhaustible energy sources are the focus of the energy industry for meeting the increased need for energy and reducing carbon emissions. Among various alternatives, harnessing solar energy has become a promising choice around the world. Parabolic trough collectors (PTCs) are an effective way to transform radiant energy into thermal energy, as well as electricity. However, these collectors can be improved by refining their design and tweaking the parameters related to thermal behavior. This may be done either by enhancing the surface area or improving the heat transfer coefficient of the heat carrying medium. These kinds of improvements could be achieved by making the use of nanofluids and by using inserts or fins within the collector tube. The current study provides an extensive review of PTCs from the points of view of their design, along with their thermal characteristics. Different types of nanofluids as the working liquid are investigated and discussed to achieve better PTC performance. Inserts within the collector tube and various design approaches, including fins, twisted tubes, U-shaped tubes, coiled wire inserts, and porous twisted tape inserts, are reviewed and discussed in detail. Finally, based on this review, challenges of PTC applications are described and future research recommendations are proposed.

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Experimental study on the solar drying of Rhubarb (Rheum ribes L.) with parabolic trough collector assisted with air recycling system, nanofluid and energy storage system

Cited by 21 publications

References 70 publications

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

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

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

Energy, exergy, environment and techno-economic analysis of parabolic trough collector: A comprehensive review

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