Stability and thermal conductivity of different nano-composite material prepared for thermal energy storage applications

Al-Amiery, Ahmed A.; Ibrahim, Sarmad I.; Ali, Ahmed Hussein; Hafidh, Sanaa A.; Chaichan, Miqdam T.; Kazem, Hussein A.; Ali, Jarinah Mohd; Isahak, Wan Nor Roslam Wan

doi:10.1016/j.sajce.2021.11.010

Cited by 12 publications

(9 citation statements)

References 64 publications

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“…According to the numerical values in Gartner’s model [ 60 ] and other publications [ 61 – 63 ], the numerical parameters may be taken as S 1 = 100 cm s −1 , S 2 = 100 cm s −1 , T 1 = 298 K, T 2 = 358 K, = 50 cm 2 ν −1 s −1 , L = 1 cm, τ = 0.02 s, f ac = 0.01 W cm −2 , κ = 0.5 W K −1 , α = 2 W K −1 , σ = 0.001 cm, and w 0 = 0.002 cm. Hence, the entropy effect can be calculated as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Chemical Scissors Tailored Nano-Tellurium with High-Entropy Morphology for Efficient Foam-Hydrogel-Based Solar Photothermal Evaporators

Xing,

Li,

Wang

et al. 2023

Nano-Micro Lett.

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The development of tellurium (Te)-based semiconductor nanomaterials for efficient light-to-heat conversion may offer an effective means of harvesting sunlight to address global energy concerns. However, the nanosized Te (nano-Te) materials reported to date suffer from a series of drawbacks, including limited light absorption and a lack of surface structures. Herein, we report the preparation of nano-Te by electrochemical exfoliation using an electrolyzable room-temperature ionic liquid. Anions, cations, and their corresponding electrolytic products acting as chemical scissors can precisely intercalate and functionalize bulk Te. The resulting nano-Te has high morphological entropy, rich surface functional groups, and broad light absorption. We also constructed foam hydrogels based on poly (vinyl alcohol)/nano-Te, which achieved an evaporation rate and energy efficiency of 4.11 kg m−2 h−1 and 128%, respectively, under 1 sun irradiation. Furthermore, the evaporation rate was maintained in the range 2.5–3.0 kg m−2 h−1 outdoors under 0.5–1.0 sun, providing highly efficient evaporation under low light conditions.

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Section: Resultsmentioning

confidence: 99%

Chemical Scissors Tailored Nano-Tellurium with High-Entropy Morphology for Efficient Foam-Hydrogel-Based Solar Photothermal Evaporators

Xing,

Li,

Wang

et al. 2023

Nano-Micro Lett.

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“…When the number of carbon atoms in the paraffin molecule is between 13 and 28 [20,21], the melting temperature falls within approximately −5 to 60 • C, a temperature range covering building applications in most climates around the world [22]. They are chemically stable; their volume increase by 10% upon melting, which is similar to many inorganic materials but less critical as paraffin are softer and therefore build up smaller forces upon expansion [23]. Paraffin is safe and non-reactive; it does not react with the most common chemical reagents [24].…”

Section: Phase Change Materialsmentioning

confidence: 99%

Performance Evaluation of Phase Change Materials to Reduce the Cooling Load of Buildings in a Tropical Climate

Sangwan

Mehdizadeh‐Rad

et al. 2022

Sustainability

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Tropical region such as Darwin has similar weather patterns throughout the year, thus creating higher energy demands in residential buildings. Typically, buildings consume about 40 per cent of the total energy consumption for indoor heating and cooling. Therefore, building envelopes are linked with design strategies such as the use of thermal energy storage and phase change materials (PCM) to minimize this energy consumption by storing a large amount of thermal energy. Primarily, PCMs are targeted by researchers for use in different components of buildings for thermal efficiency; thus, this study aimed to provide a suitable PCM to optimize indoor thermal comfort and minimize the cooling loads of residential buildings in tropical climates through simulation of a tropical climate building and provide optimum thickness for the selected material. Microencapsulated PCM mixed with gypsum in wallboards were used to reduce the cooling load of a building located in Darwin. The cooling load of the building was calculated using Revit software. A comparison of the cooling load of the building was carried out using PCM-incorporated wallboards of thicknesses of 0 cm, 1 cm and 2 cm in Energy Plus software. The total cooling load decreased by 1.1% when the 1-centimetre-thickness was applied to the wall, whereas a 1.5% reduction was obtained when a 2-centimetre-thick PCM layer was applied. Furthermore, the reduced cooling loads due to impregnation of the PCM-based gypsum wallboard gave reduced energy consumption. Ultimately, the 2-centimetre-thickness PCM-based gypsum wallboard gave a maximum reduction in cooling load with a 7.6% reduction in total site energy and 4.76% energy saving in USD/m2/year.

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“…Prabhu and ValanArasu [21] examined the stability of the paraffin wax-TiO2-Ag nanocomposites by visual analysis of the sedimentation photographs 12 h after nanoPCM production. Ibrahim et al [22], based on the fact that the addition of nanoparticles to paraffin causes a change in the absorbance and transmittance of the mixture, proposed an optical method for determining the stability of the paraffin-TiO2/MgO nanocomposite. It was observed that the absorbance of the tested nanocomposites depends on the type and concentration of added nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…In turn, the transmittance for nanocomposites with a mass concentration of 1% changes significantly for short wavelengths and is stable for long wavelengths. To examine the distribution and dispersion of nanoparticles on the surface of the samples, Ibrahim et al [22] used FESEM and energy dispersive spectroscopy (EDS). Zhang et al [23] analysed the stability of nanophase change emulsions both by direct observation and particle size distribution and particle dispersion index (PDI) measurements.…”

Section: Introductionmentioning

confidence: 99%

Stability Investigation of the PCM Nanocomposites

Cieśliński,

Boroń,

Fabrykiewicz

2023

Acta Mechanica Et Automatica

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Ensuring the stability is a key issue to be solved for the technical application of nanocomposites. In this work, fatty acid P1801 served as base phase change material (PCM)P1801, and its main ingredients are palmitic acid (58%) and stearic acid (38%). Titania (TiO2) and alumina (Al2O3) with mass concentrations of 1% and 5% were selected as nanoparticles, while polyvinylpyrrolidone (PVP) or oleic acid (OA) with mass concentrations of 5% were tested as surfactants. On the basis of the measured temperature distributions in the sample, which is subject to melting and solidification processes, it was determined which of the tested nanocomposites are stable and which are not. In addition, a thermal test was proposed to assess the stability of the produced nanoPCM, which consists in measuring the temperature distribution versus time according to a precisely given procedure.

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Stability and thermal conductivity of different nano-composite material prepared for thermal energy storage applications

Cited by 12 publications

References 64 publications

Chemical Scissors Tailored Nano-Tellurium with High-Entropy Morphology for Efficient Foam-Hydrogel-Based Solar Photothermal Evaporators

Chemical Scissors Tailored Nano-Tellurium with High-Entropy Morphology for Efficient Foam-Hydrogel-Based Solar Photothermal Evaporators

Performance Evaluation of Phase Change Materials to Reduce the Cooling Load of Buildings in a Tropical Climate

Stability Investigation of the PCM Nanocomposites

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