Concentrated Solar Power Plant Absorber Coatings

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 5275

Special Issue Editors


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Assistant Professor, Department of Material Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
Interests: synthesis of polyhedral oligomeric silsesquioxane; sol-gel thin films; modification of pigments; spectrally selective paint coatings; high solar absorptivity coatings for concentrated solar power; textile finishing; flame retardant polymers; surface treatments; nanocoatings; electrochromic materials
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Theory Department, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
Interests: molecular biology; chemical thermodynamics; physical chemistry; theoretical chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Tower-technology-based concentrated solar power (CSP) promises to deliver electricity prices below 7.3 ¢ per kW h based on thermal energy storage and future renewable-energy harvesting technology. However, the energy price depends very much on the energy-transformation efficiency, where absorber coatings play a crucial role. CSP technology requires materials that can endure high operating temperatures in air, thermal shocks, oxidative and corrosive environment, and abrasion during their lifetime.

For a central receiver system, concentrated solar radiation is directed at a central absorber, with the concentration factor reaching as high as 1000 suns; therefore, receiver peak temperatures are expected to approach 800 °C. As temperatures are raised, heat loss to re-radiation strongly impacts plant efficiency. This phenomenon can be bridged through the development of selective coatings, resulting in low thermal emission.

The manufacture, design, and test of high-performance absorber materials that possess high solar absorptivity, low thermal emissivity, durability, longievity, and are capable of serving as physical protection layers for underlaying alloy material at 800 °C in air atmosphere are opportunites for coating development.

This Special Issue of Coatings is intended to provide a forum for original research articles as well as critical reviews on current advances in the field of absorber coatings for CSP technologies.

Areas of interest include but are not limited to:

  • High solar absorptivity absorber coatigs for central tower technologies;
  • Theoretical and experimental research, knowledge and new ideas in the fields of pigments, binders, additives, application technique, curing, re-coating, evaluation under working conditions, environmental impact, etc.;
  • Understanding the degradation mechanisms of coatings reflected through optical properties, thermal conductivity, thermal load, etc.;
  • Latest development of test methods considering optical, mechanical, and thermal properties and the ability to test and predict properties by computer modeling or simulation after diferent loads equivalent to service environment;
  • Multilayered coatings, ceramic materials, diffusion, and protection layers.

Assist. Prof. Dr. Ivan Jerman
Prof. Dr. Franci Merzel
Guest Editors

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Keywords

  • High solar absorptivity coatings
  • Concentrated solar power
  • Longevity
  • Performance modeling

Published Papers (2 papers)

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Research

11 pages, 4684 KiB  
Article
Design, Fabrication and Analysis for Al2O3/Ti/Al2O3 Colored Solar Selective Absorbers for Building Applications
by Fu-Der Lai and Wen-Yang Li
Coatings 2022, 12(4), 521; https://doi.org/10.3390/coatings12040521 - 12 Apr 2022
Cited by 2 | Viewed by 1677
Abstract
A good solar selective absorber (SSA) used in building applications must have good color brightness rendering, an excellent photo–thermal conversion efficiency (PTCE) and a long life. The optical thin film design plays an important role before the coating of the optical thin films. [...] Read more.
A good solar selective absorber (SSA) used in building applications must have good color brightness rendering, an excellent photo–thermal conversion efficiency (PTCE) and a long life. The optical thin film design plays an important role before the coating of the optical thin films. In this study, for fabricating a good colored SSA (CSSA), the optical properties and color distribution of Al2O3/Ti/Al2O3 SSA were calculated to obtain the best design. It was found that the color distribution of Al2O3/Ti/Al2O3 SSA with a PTCE in excess of 90% was wide and included all colors, such as red, orange, yellow, green, blue, purple and white. Five colored Al2O3/Ti/Al2O3 solar selective absorbers were designed and fabricated and their performances were analyzed. The best PTCE of a fabricated sample and its thermal emittance efficiency were 93.2% and 7.1%, respectively. The peak values of the measured optical reflectance in the visible region for the five fabricated CSSAs were all greater than 10%. Their lifetime could be very long because the temperature difference between thermal stability of more than 450 °C and the working temperature of less than 150 °C was up to 300 °C. After annealing at 550 °C, the Al2O3–Ti system formed a compound structure of AlTiO5. The Al2O3/Ti/Al2O3 film performances, including the optical properties in the wavelength range of 0.25 to 25 μm, structure, morphology, adhesion, cross-sectional images, AFM image, PTCE, thermal emittance efficiency and thermal stability, were measured and analyzed in detail, and met the characteristic requirements of colored solar absorber films. Full article
(This article belongs to the Special Issue Concentrated Solar Power Plant Absorber Coatings)
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12 pages, 4353 KiB  
Article
CNT-Based Solar Thermal Coatings: Absorptance vs. Emittance
by Yelena Vinetsky, Jyothi Jambu, Daniel Mandler and Shlomo Magdassi
Coatings 2020, 10(11), 1101; https://doi.org/10.3390/coatings10111101 - 17 Nov 2020
Cited by 4 | Viewed by 2812
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Concentrated Solar Power Plant Absorber Coatings)
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