Experimental Investigation on Evaluation of Thermal Performance of Solar Heating System Using Al2O3 Nanofluid

Lee, Young-Ho; Jeong, Hyomin; Park, Ji-Tae; Delgado, Antonio; Kim, Sedong

doi:10.3390/app10165521

Cited by 8 publications

(5 citation statements)

References 29 publications

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“…They concluded that the temperature increases for the 0.1 wt.%, 0.3 wt.%, and 0.5 wt.% alumina nanofluids were 3.1%, 12.5%, and 13.9% higher, respectively, than distilled water (DW). Shin et al [25] reported that, in the same experiments of [24], the temperature increases for the 0.01 wt.%, 0.05 wt.%, and 0.1 wt.% CNTs/water nanofluids were 13.6%, 18.2%, and 22.1% higher than that of DW, respectively. Both studies suggested that the efficiency could be further improved by using different types of nanoparticles and dispersion methods in addition to alumina and CNTs nanofluids.…”

Section: Introductionmentioning

confidence: 88%

“…The concentrations of nanoparticles dispersed in the DW (0 wt.%) were 0.01 wt.%, 0.1 wt.%, and 1 wt.% for 300 mL of nanofluid. The total volume of the working fluid was 1000 mL in previous studies [24,25]. The total volume of the working fluid was reduced to 300 mL to obtain rapid results in this experiment, which can shorten the experimental time required to obtain the results.…”

Section: Preparation Of Nanofluidsmentioning

confidence: 95%

“…Recently, Lee et al [24] investigated the effect of nanoparticle concentration (0.1 wt.%, 0.3 wt.%, and 0.5 wt.%) on the solar thermal absorption performance of Al 2 O 3 /water nanofluids in an actual environment. They concluded that the temperature increases for the 0.1 wt.%, 0.3 wt.%, and 0.5 wt.% alumina nanofluids were 3.1%, 12.5%, and 13.9% higher, respectively, than distilled water (DW).…”

Section: Introductionmentioning

confidence: 99%

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Thermal Absorption Performance Evaluation of Water-Based Nanofluids (CNTs, Cu, and Al2O3) for Solar Thermal Harvesting

2021

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For solar thermal harvesting, an experimental study was performed on the thermal absorption performance of water-based carbon nanotubes (CNTs), Cu, and Al2O3 nanofluids using a halogen lamp-based thermal radiation system. The effect of nanoparticle concentrations (0.01 wt.%, 0.1 wt.%, and 1 wt.%) on the nanofluid dispersion, stability, and thermal absorption characteristics was investigated, and a comparative analysis was performed for each type of nanofluid. All types of nanofluids increased the absorbance and electrical conductivity with increasing nanoparticle concentration, which contributed to improving the thermal absorption performance of nanofluids. The results showed that the thermal absorption performance was high in the order of carbon-based nanofluids (CNTs), metal-based nanofluids (Cu), and oxide-based nanofluids (Al2O3). In CNTs nanofluids, the thermal absorption performance expressed the time reduction rate, which was 12.8%, 16.3%, and 16.4% at 0.01 wt.%, 0.1 wt.%, and 1 wt.% test cases, respectively. Therefore, the 0.1 wt.%-CNTs nanofluid is more economical and appropriate. However, in Al2O3 nanofluids, the time reduction rate of the 1 wt.% nanofluid was significantly higher than that of the 0.01 wt.% and 0.1 wt.% nanofluids. In Cu nanofluids, unlike CNTs and Al2O3 nanofluids, the time reduction rate constantly increased as the nanoparticle concentration increased.

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Section: Introductionmentioning

confidence: 88%

Section: Preparation Of Nanofluidsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Thermal Absorption Performance Evaluation of Water-Based Nanofluids (CNTs, Cu, and Al2O3) for Solar Thermal Harvesting

2021

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“…Its use in the field of renewable and sustainable energy technologies allows for creating high-efficient and more economic systems. In this regard, many research studies [1][2][3][4][5][6][7][8] have evaluated, theoretically and experimentally, the increase in performance in heat transfer applications and solar thermal systems associated with the use of alumina-water as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Aqueous Theta-Phase Aluminum Oxide Nanofluid for Energy Applications: Experimental Study on Thermal Conductivity

Zacarías,

de Vega,

García-Hernando

et al. 2024

Applied Sciences

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The use of nanofluids in energy systems allows for increasing efficiency and developing more economic systems. Alumina-water is one of the most common nanofluids used but little information is available about the aqueous theta-phase aluminum oxide. Given the lack of thermal conductivity data for this nanofluid, in this research, this property is experimentally evaluated. Nanofluid is prepared using the two-step method, employing a magnetic stirrer and a sonication bath. A high-precision sensor is employed for measuring thermal conductivity, using the method of transient hot wire. The thermal conductivity measurements for the base fluid (water) are compared with data provided by NIST. Nanoparticle mass fraction in the nanofluid is increased from 1 to 10% and the temperature from 22.1 to 59.3 °C. Three sonication times (1.5, 4 and 16.5 h) are used. A strong dependence between the thermal conductivity and the temperature and nanoparticles concentration has been found, while the sonication time has a negligible influence on the thermal conductivity in the range of times tested. A correlation to obtain the thermal conductivity of the water-based nanofluid using theta-phase aluminum oxide has been developed, including nanoparticle volume concentration and temperature. An excellent agreement is obtained between predicted and experimental data.

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“…Solar thermal systems are non-polluting and do not emit greenhouse gases during their operation. They could also save considerable fossil fuel and electricity consumption, which is currently used for domestic applications [1,2] since conventional heat transfer fluids have many limitations, such as poor thermal conductivity, high viscosity, uncontrollable pressure drop, and pumping power. Researchers have found a new class of heat transfer fluid (HTF) called 'nanofluids', which is defined as a colloidal suspension of nanosized solid particles incorporated with common base fluids to obtain superior thermophysical properties such as thermal conductivity, viscosity, density, and specific heat capacity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrical Conductivity, Optical Property, and Stability of 2D MXene Nanofluid Containing Ionic Liquids

et al. 2020

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The addition of ionic liquids with MXene nanofluid has a substantial impact on the solar thermal collectors’ working fluid’s optical properties that effectively absorb and distribute solar radiation. Increased solar radiation absorption potential ensures that heats are transported more rapidly and effectively. This research endeavors to investigate the concept of accumulating solar energy via the usage of ionic liquid-based 2D MXene nanofluid (Ionanofluids) for solar applications. In this study, the optical potential of Diethylene Glycol/MXene nanofluid incorporated with 1-ethyl-3-methyl imidazolium octyl sulfate ([Emim][OSO4]) ionic liquid was extensively investigated with respect to MXene concentration (0.1 to 0.4 wt%) and time (first day and seventh day) through UV-Vis Spectroscopy. A two-step approach was employed to synthesize the proposed ionanofluids with nanoparticle concentrations from 0.1 to 0.4 wt%. In wavelengths between 240 to 790 nm, the effect of ionic liquids, MXene concentration, and dispersion stability played a significant part in enhancing the absorbance capacity of the formulated MXene based Ionanofluid. Furthermore, the increase in the concentration of MXene nanoparticles resulted in more absorbance peaks facilitating high light absorption. Finally, the electrical conductivity of the ionanofluids is also analyzed as MXene renders them promising for solar cell applications. The utmost electrical conductivity of the formulated fluids of 571 μS/cm (micro siemens per centimeter) was achieved at 0.4 wt% concentration.

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Experimental Investigation on Evaluation of Thermal Performance of Solar Heating System Using Al2O3 Nanofluid

Cited by 8 publications

References 29 publications

Thermal Absorption Performance Evaluation of Water-Based Nanofluids (CNTs, Cu, and Al2O3) for Solar Thermal Harvesting

Thermal Absorption Performance Evaluation of Water-Based Nanofluids (CNTs, Cu, and Al2O3) for Solar Thermal Harvesting

Aqueous Theta-Phase Aluminum Oxide Nanofluid for Energy Applications: Experimental Study on Thermal Conductivity

Investigation of Electrical Conductivity, Optical Property, and Stability of 2D MXene Nanofluid Containing Ionic Liquids

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