Highly Selective Solar Thermal Sprayable Coating Based on Carbon Nanotubes

Solar RRL ◽  
2017 ◽  
Vol 1 (9) ◽  
pp. 1700080 ◽  
Author(s):  
Raj Kumar Bera ◽  
Yaniv Binyamin ◽  
Subodh G. Mhaisalkar ◽  
Shlomo Magdassi ◽  
Daniel Mandler
Keyword(s):  
Carbon Nanotubes ◽  
Solar Thermal

Formation and performance of highly absorbing solar thermal coating based on carbon nanotubes and boehmite

2016 ◽  
Vol 120 ◽  
pp. 287-293 ◽  
Author(s):  
Raj Kumar Bera ◽  
Subodh Gautam Mhaisalkar ◽  
Daniel Mandler ◽  
Shlomo Magdassi
Keyword(s):  
Carbon Nanotubes ◽  
Solar Thermal ◽  
And Performance ◽  
Thermal Coating

Effect of carbon nanotubes on the global aging behavior of β-nucleated polypropylene random copolymers for absorbers of solar-thermal collectors

Solar Energy ◽  
2018 ◽  
Vol 172 ◽  
pp. 141-145 ◽  
Author(s):  
Gernot M. Wallner ◽  
Michael K. Grabmann ◽  
Clemens Klocker ◽  
Wolfgang Buchberger ◽  
David Nitsche
Keyword(s):  
Carbon Nanotubes ◽  
Solar Thermal ◽  
Random Copolymers ◽  
Aging Behavior ◽  
Solar Thermal Collectors ◽  
Global Aging

scholarly journals CNT-Based Solar Thermal Coatings: Absorptance vs. Emittance

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1101
Author(s):  
Yelena Vinetsky ◽  
Jyothi Jambu ◽  
Daniel Mandler ◽  
Shlomo Magdassi
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Solar Thermal ◽  
Good Adhesion ◽  
Solar Absorptance ◽  
Novel Approach ◽  
Binder Concentration ◽  
Excellent Adhesion ◽  
Minimum Ratio

A novel approach for fabricating selective absorbing coatings based on carbon nanotubes (CNTs) for mid-temperature solar–thermal application is presented. The developed formulations are dispersions of CNTs in water or solvents. Being coated on stainless steel (SS) by spraying, these formulations provide good characteristics of solar absorptance. The effect of CNT concentration and the type of the binder and its ratios to the CNT were investigated. Coatings based on water dispersions give higher adsorption, but solvent-based coatings enable achieving lower emittance. Interestingly, the binder was found to be responsible for the high emittance, yet, it is essential for obtaining good adhesion to the SS substrate. The best performance of the coatings requires adjusting the concentration of the CNTs and their ratio to the binder to obtain the highest absorptance with excellent adhesion; high absorptance is obtained at high CNT concentration, while good adhesion requires a minimum ratio between the binder/CNT; however, increasing the binder concentration increases the emissivity. The best coatings have an absorptance of ca. 90% with an emittance of ca. 0.3 and excellent adhesion to stainless steel.

Study of High Temperature Nanofluids Using Carbon Nanotubes (CNT) for Solar Thermal Storage Applications

2010 ◽  
Author(s):  
Byeongnam Jo ◽  
Debjyoti Banerjee
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Specific Heat ◽  
Sodium Dodecyl ◽  
Eutectic Mixture ◽  
Lithium Carbonate ◽  
Solar Thermal ◽  
Molar Ratio ◽  
Solar Thermal Energy ◽  
Measured Specific Heat

The aim of this study is to investigate enhancement of thermal properties of various high temperature nanofluids using Carbon Nanotubes (CNT) for solar thermal energy storage applications. The specific heat of liquid carbonate salt eutectics that are doped with CNT was measured using Differential Scanning Calorimeter (DSC). A eutectic mixture of lithium carbonate (Li2CO3) and potassium carbonate (K2CO3) at a molar ratio of 62:38 is used as the base fluid (solvent). A surfactant (Sodium Dodecyl Sulfate or “SDS”) was used to obtain well-dispersed suspension of CNT in distilled water. This CNT suspension was added to an aqueous solution of two alkali carbonate salts in the form of a eutectic mixture. The resulting solution was evaporated on a hot-plate to obtain a dry mixture of CNT (at 1% concentration by weight) in the carbonate eutectic. The samples were synthesized for by evaporating at four different hotplate temperatures of 100 °C, 120 °C, 140 °C, and 160 °C. The results showed that specific heat capacities of carbonate eutectic-CNT nanofluids were linearly increased as the hotplate temperature was increased. At higher temperatures the water was evaporated faster — leading to less agglomeration of the nanoparticles in the nanofluids and thus resulting in higher values of the measured specific heat of the nanofluids.

Effects of Multi-Walled Carbon Nanotubes on Enhancing the Thermodynamics Characteristic of Alkali Nitrate and Chlorate Salt for Concentration Solar Plants

2013 ◽  
Vol 805-806 ◽  
pp. 63-69 ◽  
Author(s):  
Di Wu ◽  
Shi Liu
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Molten Salt ◽  
Fossil Fuels ◽  
Thermal Power ◽  
Thermal Storage ◽  
Solar Thermal ◽  
Heat Transfer Fluid ◽  
Solar Thermal Power ◽  
The Future

Solar thermal power generation technology is the most feasible technology to compete with fossil fuels in the economy, and is considered to be one of the most promising candidates for providing a major share of the clean and renewable energy needed in the future. The appropriate heat transfer fluid and storage medium is a key technological issue for the future success of solar thermal technologies. Molten salt is one of the best heat transfer and thermal storage fluid for both parabolic trough and tower solar thermal power system. It is very important that molten salt heat transfer mechanisms are understood and can be predicted with accuracy. But studies on molten salts heat transfer are rare. This study will lay a foundation for the application of carbon nanotubes in molten salt which can remarkably improve the stability and capacity of thermal storage. Thermal analysis methods and scanning electron microscope (SEM) are utilized to provide a review of thermophysical properties and thermochemical characteristics of the MWCNTs-salt composite materials.

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