A comprehensive analysis of nanofluids and their practical applications for flat plate solar collectors: Fundamentals, thermophysical properties, stability, and difficulties

Ajeena, Ahmed M.; Víg, Piroska; Farkas, I.

doi:10.1016/j.egyr.2022.03.088

Cited by 51 publications

(14 citation statements)

References 148 publications

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“…At higher temperatures, a downward asymptotic behavior is observed due to the dependency of heat transfer on the temperature difference. 29 Analyzing the results, it is observed that the photothermal efficiency improves at any concentration of particles compared to pure water, and the efficiency is consistent with the temperature evolution. The photothermal efficiency at 50 ppm is lower throughout the temperature range than at higher concentrations, reaching a maximum efficiency of 17.5% at 55°C.…”

Section: Transmittancementioning

confidence: 64%

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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: Transmittancementioning

confidence: 64%

“…At higher temperatures, a downward asymptotic behavior is observed due to the dependency of heat transfer on the temperature difference. 29…”

Section: Resultsmentioning

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

View full text Add to dashboard Cite

show abstract

“…At higher temperatures, a downward asymptotic behavior is observed due to the dependency of heat transfer on the temperature difference. 32 Analyzing the results, it is observed that the photothermal efficiency improves at any concentration of particles compared to pure water, and the efficiency is consistent with the temperature evolution.…”

Section: Thermal Study In the Solar Simulatormentioning

confidence: 64%

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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“…Solar water heating (SWH) is a prevalent household and industrial heating technology [ 88 ]. A solar water heater is a device that heats water using the sun’s light energy.…”

Section: Cnt-based Solar Heat Conversion Devicesmentioning

confidence: 99%

Recent Development of Carbon-Nanotube-Based Solar Heat Absorption Devices and Their Application

Islam

Furuta

2022

Nanomaterials

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Population growth and the current global weather patterns have heightened the need to optimize solar energy harvesting. Solar-powered water filtration, electricity generation, and water heating have gradually multiplied as viable sources of fresh water and power generation, especially for isolated places without access to water and energy. The unique thermal and optical characteristics of carbon nanotubes (CNTs) enable their use as efficient solar absorbers with enhanced overall photothermal conversion efficiency under varying solar light intensities. Due to their exceptional optical absorption efficiency, low cost, environmental friendliness, and natural carbon availability, CNTs have attracted intense scientific interest in the production of solar thermal systems. In this review study, we evaluated CNT-based water purification, thermoelectric generation, and water heating systems under varying solar levels of illumination, ranging from domestic applications to industrial usage. The use of CNT composites or multilayered structures is also reviewed in relation to solar heat absorber applications. An aerogel containing CNTs was able to ameliorate water filtering performance at low solar intensities. CNTs with a Fresnel lens improved thermoelectric output power at high solar intensity. Solar water heating devices utilizing a nanofluid composed of CNTs proved to be the most effective. In this review, we also aimed to identify the most relevant challenges and promising opportunities in relation to CNT-based solar thermal devices.

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A comprehensive analysis of nanofluids and their practical applications for flat plate solar collectors: Fundamentals, thermophysical properties, stability, and difficulties

Cited by 51 publications

References 148 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

Recent Development of Carbon-Nanotube-Based Solar Heat Absorption Devices and Their Application

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