Experimental Study on Thermal Properties of Nano-TiO2 Embedded Paraffin (NEP) for Thermal Energy Storage Applications

Kumar, P. Manoj; Mylsamy, K.; Saravanakumar, P.; Anandkumar, R.; Pranav, A.T Navin

doi:10.1016/j.matpr.2020.03.282

Cited by 50 publications

(5 citation statements)

References 17 publications

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“…The charging time of nano-paraffin is affected by the thermal conductivity of the samples and the higher conductivity, the shorter charging period, and the lower the melting point. This result was confirmed by the references [1,69,70]. The phase change period for paraffin takes longer than in the case of nano-paraffin, because the solid layer that faces the heat flow acts as an insulator that prevents heat transfer to the layers that follow when it is heated.…”

Section: Charging Periodsupporting

confidence: 62%

“…The change in the total color of the nano-paraffin is important evidence that proves the success of the mixing process. However, this color change does not mean that the mixture is stable, so care must be taken on both characteristics, knowing that both depends on the time of sonication and the degree of vibration, as stated by references [1,54].…”

Section: Optical Propertiesmentioning

confidence: 99%

“…Non-renewable energy sources have been widely used to meet global energy production requirements for decades [1]. There are many constraints facing the use of nonrenewable resources, such as pricing, and economic, political, and environmental issues.…”

Section: Introductionmentioning

confidence: 99%

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Modified Nano-Fe2O3-Paraffin Wax for Efficient Photovoltaic/Thermal System in Severe Weather Conditions

et al. 2022

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The development of modern photovoltaic thermal systems (PV/T) is one of the most important steps in the application of using solar energy to produce both electricity and heat. Studies have shown that a system consisting of a heat-collecting tank the is most efficient system, in which the phase change materials (PCMs) are mixed with nanoparticles inside the system that are cooled by a cooling fluid (preferably a nanofluid). The PCMs have a high capacity to store energy in the form of latent heat. Nanoparticles are added to PCMs to treat and improve the low thermal conductivity of these materials. In this experimental study, nano-iron oxide III (Fe2O3) was added to paraffin wax in multiple mass fractions to evaluate the thermophysical changes that can be occur on the wax properties. Four samples of paraffin–nano-Fe2O3 were prepared with mass fractions of 0.5%, 1%, 2% and 3%, and their thermophysical properties were compared with pure paraffin (without nano additives). The results from this study showed that adding nano-Fe2O3 at any mass fraction increases the viscosity and density of the product. Thermal conductivity is improved by adding nano-Fe2O3 to paraffin wax by 10.04%, 57.14%, 76.19%, and 78.57% when adding mass fractions of 0.5%, 1%, 2%, and 3%, respectively. Stability tests showed that the prepared samples have excellent thermal stability (especially for 0.5% and 1% added nano-Fe2O3) to acceptable level of stability when adding 3% of nano-Fe2O3. The nano-Fe2O3 paraffin PV/T system was tested outdoors to ensure its ability to operate in the harshest weather conditions of Baghdad city. The current experimental results indicated clear evidence of the success of the examined nano-PCM.

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Section: Charging Periodsupporting

confidence: 62%

Section: Optical Propertiesmentioning

confidence: 99%

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Modified Nano-Fe2O3-Paraffin Wax for Efficient Photovoltaic/Thermal System in Severe Weather Conditions

et al. 2022

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“…They found that the 0.3% weight of nanoparticles boosted the specific heat capacity and the thermal conductivity of the base PCM by 43% and 16%, respectively, which was the maximum enhancement they had obtained through the experiments. Kumar et al [21] acknowledged 101.67% advancement in thermal conductivity of the paraffin when it is doped with titania nanoparticles at low mass concentration. Karthick et al [22][23][24] investigated the eutectic mixture of the inorganic phase change material for the building integrated photovoltaic module.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Hybrid-nano/Paraffin Organic Phase Change Material for Thermal Energy Storage Applications in Solar Thermal Systems

Pasupathi

Karthick

P³

et al. 2020

Energies

140

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In this work, the experimental investigations were piloted to study the influence of hybrid nanoparticles containing SiO2 and CeO2 nanoparticles on thermo-physical characteristics of the paraffin-based phase change material (PCM). Initially, the hybrid nanoparticles were prepared by blending equal mass of SiO2 and CeO2 nanoparticles. The hybrid-nano/paraffin (HnP) samples were prepared by cautiously dispersing 0, 0.5, 1.0, and 2.0 percentage mass of hybrid nanoparticles inside the paraffin, respectively. The synthesized samples were examined under different instruments such as field emission scanning electron microscope (FESEM), Fourier transform infrared spectrometer (FTIR), differential scanning calorimetry (DSC), thermogravimetric analyzer (TGA), and thermal properties analyzer to ascertain the influence of hybrid nanoparticles on thermo-physical characteristics of the prepared samples. The obtained experimental results proved that the hybrid nanoparticles were uniformly diffused in the paraffin matrix without affecting the chemical arrangement of paraffin molecules. Prominently, the relative thermal stability and relative thermal conductivity of the paraffin were synergistically enriched up to 115.49% and 165.56%, respectively, when dispersing hybrid nanoparticles within paraffin. Furthermore, the hybrid nanoparticles appropriately amended the melting and crystallization point of the paraffin to reduce its supercooling, and the maximum reduction in supercooling was ascertained as 35.81%. The comprehensive studies indicated that the paraffin diffused with SiO2 and CeO2 hybrid nanoparticles at 1.0 mass percentage would yield a better outcome compared to the next higher mass fractions without much diminishing the latent heat of paraffin. Hence, it is recommended to utilize the hybrid-nano/paraffin with 1.0 mass fraction of the aforementioned hybrid nanoparticles for effectively augmenting the thermal energy capacity of low-temperature solar thermal systems.

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“…However, because they possess a wide gap (Eg > 3 eV), their efficacy and sensitivity only occur under UV-light making solar-light application not enough efficient [11,12]. In this respect, active research is directed to the elaboration of catalysts active under visible light for the wastewater treatment [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Quinoline Yellow over Ag3PO4

et al. 2020

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In this study, the ability of Ag3PO4 to achieve the photocatalytic degradation of quinoline yellow (QY) a hazardous and recalcitrant dye, under UVA and visible light was investigated. The photocatalyst Ag3PO4 was synthesized through a precipitation method, and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), BET Brunauer–Emmett-Teller (BET) analysis, UV-Differential Reflectance Spectroscopy (DRS) and Fourier transform infrared spectroscopy (FTIR). Ag3PO4 could successfully induce the photocatalytic degradation of QY under UVA and visible light. Optimal parameters were 0.5 g·L−1 of the catalyst, 20 ppm of QY and pH~7. Ag3PO4 was 1.6-times more efficient than TiO2 Degussa P25 under UVA light in degrading QY. Total organic carbon (TOC) analyses confirmed the almost complete QY mineralization. At least eight intermediate degradation products were identified by liquid chromatography coupled to high resolution mass spectrometry. The stability of Ag3PO4 was satisfactory as less than 5% Ag metal appeared in XRD analyses after 3 reuse cycles. These results show that under optimized conditions Ag3PO4 can efficiently achieve quinolone yellow mineralization.

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Experimental Study on Thermal Properties of Nano-TiO2 Embedded Paraffin (NEP) for Thermal Energy Storage Applications

Cited by 50 publications

References 17 publications

Modified Nano-Fe2O3-Paraffin Wax for Efficient Photovoltaic/Thermal System in Severe Weather Conditions

Modified Nano-Fe2O3-Paraffin Wax for Efficient Photovoltaic/Thermal System in Severe Weather Conditions

Characterization of Hybrid-nano/Paraffin Organic Phase Change Material for Thermal Energy Storage Applications in Solar Thermal Systems

Photocatalytic Degradation of Quinoline Yellow over Ag3PO4

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