Dual use of carbon nanotube selective coatings in evacuated tube solar collectors

Martínez, Patricia; Pozdin, Vladimir A.; Papadimitratos, Alexios; Holmes, William; Hassanipour, Fatemeh; Zakhidov, Anvar A.

doi:10.1016/j.carbon.2017.04.026

Cited by 19 publications

(4 citation statements)

References 50 publications

(73 reference statements)

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“…[38] Investigating the effect of using carbon nanotube selective coatings used in evacuated tube solar collectors  The carbon nanotube was proposed as an ideal solar selective coating for evacuated tube collectors as it had better absorption and lower reflection compared with common coatings. [39] Design and optimization of evacuated tube solar water heaters  Design of two innovative evacuated tube solar water heaters resulted in high heat collection rates of 11 MJ/m 2 . [40] Experimental analysis of evacuated tube solar water heaters  The performance of evacuated tube and flat plate domestic solar water heaters was compared.…”

Section: Evacuated Tubesmentioning

confidence: 99%

A review of latest developments, progress, and applications of heat pipe solar collectors

Shafieian

Khiadani

Nosrati

2018

Renewable and Sustainable Energy Reviews

142

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Among all the available solutions to the current high energy demand and consequent economic and environmental problems, solar energy, without any doubt, is one of the most promising and widespread solutions. However, conventional solar systems face some intractable challenges affecting their technical performance and economic feasibility. To overcome these challenges, increasing attention has been drawn towards the utilization of heat pipes, as an efficient heat transfer technology, in conventional solar systems. To the authors' knowledge, despite many valuable studies on heat pipe solar collectors (mainly during the last decade), a comprehensive review which surveys and summarizes those studies and identifies the research gaps in this field has not been published to date. This review paper provides an overview of the recent studies on heat pipe solar collectors (HPSCs), their utilization in different domestic, industrial, and innovative applications, challenges, and future research potentials. The concept and principles of HPSCs are first introduced and a review of the previous studies to improve both energy efficiency and cost effectiveness of these collectors is presented. Moreover, a concise section is dedicated to mathematical modeling to demonstrate suitable methods for simulating the performance of HPSCs. Also, the latest applications of HPSCs in water heating, desalination, space heating, and electricity generation systems are reviewed, and finally, some recommendations for future research directions, regarding both development and new applications, are made.

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Section: Evacuated Tubesmentioning

confidence: 99%

A review of latest developments, progress, and applications of heat pipe solar collectors

Shafieian

Khiadani

Nosrati

2018

Renewable and Sustainable Energy Reviews

142

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“…The studies of carbon nanotube (CNT) structures, such as vertically aligned multi-walled carbon nanotube (MWCNT) arrays [1,2], coating of MWCNT mats [1,3], CNT forest [4,5], CNT honeycomb structures [6], filtrated CNT coating [7], spun CNT sheet [8], were commonly focused on the black color, low reflectance, and matt surface appearance.…”

Section: Introductionmentioning

confidence: 99%

“…Udorn et al reported that cells with average areas smaller than 30 μm 2 showed a higher total reflectance than as-synthesized CNT forest [6]. Martinez et al reported that densified spun CNT sheet has slightly higher reflectance compared to non-densified spun CNT sheet, probably due to smoother surface [8].…”

Section: Introductionmentioning

confidence: 99%

Smooth surface induced glossy appearance of freestanding multiwall carbon nanotube sheet

et al. 2021

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Carbon nanotube (CNT) structures reported in the literature often have a black color with low reflectance and matt surface appearance. Only a few papers reported the high reflectance and glossy appearance of the CNT surface on a substrate. To our knowledge, no one has reported the glossy appearance of freestanding CNT. Herein, we have successfully fabricated a freestanding multi-walled CNT sheet with a glossy or mirror-like surface appearance. Raman spectroscopy confirmed that both matt and glossy freestanding CNT sheets have the same chemical composition. We found that the glossy freestanding CNT sheet has a relatively flat surface morphology compared to matt freestanding CNT sheet, as seen in the atomic force microscopy results. We attributed the glossy appearance due to a relatively flat surface morphology of the freestanding CNT sheet.

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“…The use of renewable energy sources is an optimal solution to overcome these challenges. Solar energy has the greatest potential of the available renewable energies as, properly managed, it could provide enough energy to exceed the total estimated lifetime of fossil fuel resources in a single year [1,2]. The direct absorption solar collector (DASC) concept is an interesting alternative to improve the efficiency of collecting solar energy and converting it into useful energy [3].…”

Section: Introductionmentioning

confidence: 99%

Optical characterisation and photothermal conversion efficiency of a water-based carbon nanofluid for direct solar absorption applications

Gimeno-Furio

Martínez‐Cuenca

Mondragón

et al. 2020

Energy

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Carbon nanoparticles are very useful in solar thermal applications as they absorb much of the solar spectrum and can be inexpensive. Water-based carbon nanofluids with two different concentrations (3 and 33 mg•l-1) were prepared with sodium dodecyl sulphate as surfactant to achieve good high-temperature stability with a constant mean particle size of 200 nm at 25 °C and 85 °C. The morphology of the nanoparticles was observed by Transmission Electron Microscopy and the particle size distribution was studied using Dynamic Light Scattering at room and high temperature. Ballistic transmittance, absorption coefficient and scattering albedo of the three fluids were measured by a spectrophotometer with and without an integrating sphere using the Kubelka-Munk theory. The average value of the absorption coefficient showed important increases when comparing water against the nanofluid with the highest concentration (from 0.1 to 3.3 cm-1). Finally, the temperature change achieved when lighting the samples with an artificial sunlight simulator were measured and photothermal conversion efficiencies were evaluated, with increases of up to 200 % when comparing nanofluid and base fluid. The results of this study show this kind of nanofluids to be very interesting for increasing the overall efficiency of the direct absorber solar collectors.

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Dual use of carbon nanotube selective coatings in evacuated tube solar collectors

Cited by 19 publications

References 50 publications

A review of latest developments, progress, and applications of heat pipe solar collectors

A review of latest developments, progress, and applications of heat pipe solar collectors

Smooth surface induced glossy appearance of freestanding multiwall carbon nanotube sheet

Optical characterisation and photothermal conversion efficiency of a water-based carbon nanofluid for direct solar absorption applications

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