Experimental thermal performance investigation of a direct absorption solar collector using hybrid nanofluid of gold nanoparticles with natural extract of Azadirachta Indica leaves

Gupta, Varun Kumar; Kukreja, Rajeev; Chander, Nikhil

doi:10.1016/j.renene.2022.12.014

Cited by 26 publications

(9 citation statements)

References 46 publications

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“…Later, this solution was diluted with DI water and Au‐NPs solution of mass fraction of about 4 mg/L to synthesize hybrid heat transfer fluid. The detailed procedure of synthesizing mono‐spherical Au‐NPs and Azadirachta Indica leaves extract has already been discussed more elaborately in our previous research articles 20,58 . Figure 1A,B shows the chemically synthesized mono‐spherical Au‐NPs and Azadirachta Indica leave extract, respectively.…”

Section: Research Materials and Methodologymentioning

confidence: 99%

“…One such natural absorbent is a natural green pigment known as chlorophyll in plant leaves and, therefore, extensively tested in solar photovoltaic systems 55‐57 . Authors have demonstrated that a hybrid nanofluid of mono‐spherical Au‐NPs (sizes ~ 30 nm and f m ~ 4 mg/L) and Azadirachta Indica leaves extract‐based heat transfer fluids can show promising results for performance enhancement over conventional working fluids in such novel VASC systems 58 …”

Section: Introductionmentioning

confidence: 99%

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Real‐time thermal performance investigation of a thermal energy storage integrated direct absorption solar collector under tropical climate

Gupta,

Kumar,

Kukreja

et al. 2024

Energy Storage

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In the last two decades, metallic particles of nano sizes (~10−9 m) have been tested profoundly in volumetric absorption solar collectors (VASC) due to their excellent optical properties and broadband absorption in the entire solar spectrum. However, very limited studies are available for understanding the performance of integrated energy storage VASC systems using nanofluids. For the experimental work presented here, a hybrid nanofluid of gold nanoparticles in Azadirachta indica leaves extract has been synthesized by chemical route. The prepared hybrid nanofluid has shown good absorption in 400 to 700 nm wavelength range and hence achieved high photo‐thermal conversion efficiency for tested VASC system. Furthermore, commercially available paraffin wax is used as a phase change material (PCM) in thermal energy storage (TES) and further integrated with VASC to analyze the thermal performance of the system even after sunshine hours. The real‐time experiments were conducted using different working fluids, and at three mass flow rates, that is, 0.008 kg/s, 0.016 kg/s, and 0.033 kg/s, respectively, during mild winter days in the tropical climate of India. The study revealed a photo‐thermal efficiency enhancement of about 17.1% when hybrid heat transfer fluid was used in the VASC system with TES as compared to base fluid water but without TES. During the heating period, the maximum thermal gain of the hybrid nanofluid was observed to be about 15°C higher than the ambient temperature at mass flow rate of 0.033 kg/s. Thermal efficiency enhancement of about 23.8%, 24%, and 24.1% was observed with hybrid nanofluid compared to base fluid water at a mass flow rate of 0.008 kg/s, 0.016 kg/s, and 0.033 kg/s, respectively, when PCM was kept inside the tank. Furthermore, a maximum zero loss efficiency of 83.8% was estimated at an optimal mass flow rate of 0.033 kg/s for the TES‐integrated VASC system.

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Section: Research Materials and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Real‐time thermal performance investigation of a thermal energy storage integrated direct absorption solar collector under tropical climate

Gupta,

Kumar,

Kukreja

et al. 2024

Energy Storage

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“…The particles from each sample were collected via centrifugation at 8000 revolutions per minute (rpm) for 10 min and were re-dispersed in water. In a recent study by Gupta et al [ 59 ], spherical gold Au NPs with a size of ~30 nm were synthesized using the Turkevich method. Chloroauric acid was boiled and a trisodium citrate dihydrate solution was gradually added, resulting in a colour change from transparent to red, indicating Au NPs formation.…”

Section: Nanoparticles Used For Dasc Nanofluidsmentioning

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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“…In the United States, the use of photovoltaic solar energy has been increasing in recent years in residential and industrial areas due to the reduction in the costs of operation, implementation, and maintenance of the equipment. 4…”

Section: Introductionmentioning

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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Experimental thermal performance investigation of a direct absorption solar collector using hybrid nanofluid of gold nanoparticles with natural extract of Azadirachta Indica leaves

Cited by 26 publications

References 46 publications

Real‐time thermal performance investigation of a thermal energy storage integrated direct absorption solar collector under tropical climate

Real‐time thermal performance investigation of a thermal energy storage integrated direct absorption solar collector under tropical climate

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

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

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