Photo-thermal conversion properties of hybrid CuO-MWCNT/H2O nanofluids for direct solar thermal energy harvest

Qu, Jian; Zhang, Ruomei; Wang, Wenwen; Wang, Qian

doi:10.1016/j.applthermaleng.2018.10.094

Cited by 128 publications

(48 citation statements)

References 30 publications

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“…A previous investigation on the solar weighted absorption coefficient showed that the penetration distance decreases with an increase in the nanofluid concentration [12,19,32,54]. Qu [27] reported that the solar absorption fraction of CuO nanofluid rapidly increased with an increase in the nanofluid concentration at a penetration distance of 1 cm, as shown in Figure 9. The solar weighted absorption fraction of the 0.25 wt% CuO nanofluid reached 90% at a penetration distance of 1 cm; however, the solar weighted absorption fraction of 0.01 wt% CuO nanofluid did not even reach 70% at a penetration distance of 10 cm.…”

Section: Optical Properties Of Nanofluidsmentioning

confidence: 75%

“…Nevertheless, the use of ethylene glycol alone in the heat transfer system is not a good choice because of its high viscosity, which is why most of the studies used its mixture with DI water. [19] Au one-step DI water 25-10 mg/L - [20] Au, CNT, Fe 3 O 4 two-step DI water 10-50 ppm - [21] Fe 3 O 4 two-step Water 1-5wt% - [22] Graphite two-step DI water/Paraffin -- [23] Au, MWCNT two-step DI water 0.0001-0.004vol% - [24] rGO, Ag-rGO two-step DI water 10-100 mg/L - [25] CuO two-step Paraffin 0.01-0.1wt% SSL [26] TiN, Au/TiN two-step EG 10-100 ppm - [27] CuO-MWCNT two-step DI water 0.01-0.25wt% - In the next section, the optical properties and photothermal energy conversion performance of various nanofluids are discussed and illustrated.…”

Section: Nanofluid Preparation For Solar Thermal Applicationsmentioning

confidence: 99%

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Review of the Photothermal Energy Conversion Performance of Nanofluids, Their Applications, and Recent Advances

et al. 2020

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Nanoparticles have been thoroughly investigated in the last few decades because they have many beneficial and functional qualities. Their capability to enhance and manipulate light absorption, thermal conductivity, and heat transfer efficiency has attracted significant research attention. This systematic and comprehensive work is a critical review of research on the photothermal energy conversion performance of various nanofluids as well as the recent advances in several engineering applications. Different nanofluids used in the photothermal energy conversion process were compared to identify the suitable applications of each nanofluid in thermal systems. An analysis of the previous investigations based on experimental and numerical studies has established that nanomaterials have the potential to increase the efficiency of solar thermal systems.

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Section: Optical Properties Of Nanofluidsmentioning

confidence: 75%

Section: Nanofluid Preparation For Solar Thermal Applicationsmentioning

confidence: 99%

Review of the Photothermal Energy Conversion Performance of Nanofluids, Their Applications, and Recent Advances

et al. 2020

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“…Further increase in the MWCNTs concentration to 0.02 wt% boosted the infrared emissivity, increasing heat loss of slurry and thus lowering temperature rise 20 . On the other hand, the excessive MWCNTs concentration intensified aggregation of MWCNTs, deteriorating the optical absorption property of slurry 49 . As illustrated in Figure 12B, the slurries with different MWCNTs concentrations shared almost same heat capacity due to the constant MPCMs concentration.…”

Section: Resultsmentioning

confidence: 96%

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

et al. 2020

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Summary The development of high‐efficient working fluids with excellent photo‐thermal conversion and heat storage properties is an important factor to solar thermal utilization. In this work, magnetic phase change microcapsules (MPCMs) were prepared via in situ polymerization, where melamine‐formaldehyde (MF) resin and octadecane containing oleic acid‐coated magnetic nanoparticles (OA‐MNs) were used as the shell and core, respectively. The microstructure, magnetic and thermal properties of MPCMs were investigated, and the photo‐thermal conversion and heat storage properties of slurries prepared by dispersing MPCMs into multi‐walled carbon nanotubes (MWCNTs) nanofluids were explored. The encapsulation efficiency of MPCMs with superparamagnetic nature achieved 63.51%, while the thermal conductivity of MPCMs was slightly increased with regard to phase change microcapsules (PCMs) and the thermal stability of octadecane was enhanced after being encapsulated. Moreover, the slurry with 0.01 wt% MWCNTs and 15 wt% MPCMs had the optimal photo‐thermal conversion properties and thermal storage capacity. Beyond that, the recycled MPCMs represented excellent recyclability. Our research demonstrated that the MWCNTs‐dispersed MPCMs slurry is one of ideal working fluids with excellent photo‐thermal conversion and heat storage characteristics for direct absorption solar collector.

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“…[14] Interestingly, the PDA/BSA NPs were found to be stable after UV irradiation with an energy equivalent to 6.5 years of sunlight reaching Switzerland as calculated from data obtained by the Swiss meteorological service ( Figure S3, Supporting Information). [14] Interestingly, the PDA/BSA NPs were found to be stable after UV irradiation with an energy equivalent to 6.5 years of sunlight reaching Switzerland as calculated from data obtained by the Swiss meteorological service ( Figure S3, Supporting Information).…”

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confidence: 88%

Polydopamine Nanoparticle Doped Nanofluid for Solar Thermal Energy Collector Efficiency Increase

Hauser

Steinmetz

Balog

et al. 2019

Advanced Sustainable Systems

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Polydopamine can form black nanoparticles and has recently been gaining attention due to its extraordinary heating properties upon excitation with light. Herein, polydopamine hybrid nanoparticles are synthesized in different sizes and subsequently added to a solar fluid to analyze heating ability. The solar fluids with the differently sized hybrid polydopamine particles are compared to a solar fluid containing food coloring (i.e., micrometer‐sized soot particles, similar to India Ink) and silver nanoparticles. The hybrid polydopamine nanoparticles are found to heat more efficiently than silver nanoparticles or food coloring, respectively. In addition, no hybrid polydopamine nanoparticle deposits are found in the direct absorption solar collector in comparison to the solar fluids doped with silver nanoparticles or food coloring. Thus, this work shows that hybrid polydopamine nanoparticles are promising candidates to increase the efficiency of solar fluids.

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Photo-thermal conversion properties of hybrid CuO-MWCNT/H2O nanofluids for direct solar thermal energy harvest

Cited by 128 publications

References 30 publications

Review of the Photothermal Energy Conversion Performance of Nanofluids, Their Applications, and Recent Advances

Review of the Photothermal Energy Conversion Performance of Nanofluids, Their Applications, and Recent Advances

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

Polydopamine Nanoparticle Doped Nanofluid for Solar Thermal Energy Collector Efficiency Increase

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