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  4. Selective solar absorber coatings on receiver tubes for CSP - energy-efficient production process by sol-gel dip-coating and subsequent induction heating
 
conference paper

Selective solar absorber coatings on receiver tubes for CSP - energy-efficient production process by sol-gel dip-coating and subsequent induction heating

Joly, M.  
•
Antonetti, Y.
•
Python, M.
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2014
2013 ISES Solar World Congress
ISES Solar World Congress

The energy efficiency of production processes for components of solar energy systems is an important issue. Other factors, which are important for the production of black selective solar coatings include production speed, cycle time and homogeneity of the coating, as well as the minimization of the quantity of the needed chemical precursors. In this paper a new energy-efficient low-cost production process is presented for production of optically selective coatings for solar thermal absorbers. The used method to produce such coatings is sol-gel dip-coating for which all the solutions have been synthetized at the Solar Energy and Building Physics Laboratory of EPFL. The used precursors are tetraethyl orthosilicate, manganese acetate tetrahydrate, copper chloride dihydrate and cobalt chloride hexahydrate. Solutions were obtained by dissolving these precursors in a solution based on a mixture of absolute ethanol, nitric acid and demineralized water. The layers deposited on sheetlike substrates were annealed in a benchtop furnace. For 2 meter long austenitic stainless steel tubes, a novel, fast and energy-efficient process based on induction heating was developed for the thermal annealing. An induction coil passes along the tube. An alternating current flowing in the coil induces a current in the tube. By resistive heating, the temperature of both the metallic tube wall and the deposited film increases. The homogeneity of the temperature distribution of the tube after a single passage of the coil was monitored by infrared imaging. The optical and morphological properties of the Cu-Co-Mn-Si-0 based triple layer have been characterized by spectrophotometry, transmission electron microscopy (TEM), time-of-flight secondary ion mass spectroscopy (ToFSIMS) and X-ray photoelectron spectroscopy (XPS). After optimization of the multilayer design, a solar absorptance of 0.95 and a thermal emissivity of 0.12 at 100 C have been achieved. The intermediate Cu-Co-Mn-Si-0 layer was analyzed by transmission electron microscopy. The likewise obtained images show an agglomeration of crystalline grains with 5-20 nm in diameter. Therefore, we can consider that the Cu-Co-Mn-Si-0 phase is nanocrystalline. In order to roughly estimate the corrosion resistance of the coating in an acidic environment, a simple corrosion test in harsh conditions confirmed the durability of the novel sol-gel coating. Moreover, the excellent stability at elevated temperatures in ambient air makes the coating an interesting candidate for solar applications involving concentrated solar radiation, such as the generation of solar electricity (concentrated solar power), industrial process heating and solar cooling. For that reason, prototype coatings consisting of stacks of three individual layers were deposited on 2 meter long stainless steel tubes. (C) 2014 Published by Elsevier Ltd.

  • Details
  • Metrics
Type
conference paper
Web of Science ID

WOS:000348253200053

Author(s)
Joly, M.  
Antonetti, Y.
Python, M.
Lazo, Gonzalez  
Aymara, Marina
Gascou, T.
Hessler-Wyser, A.  
Scartezzini, Jean-Louis  
Schueler, Andreas  
Date Issued

2014

Publisher

Elsevier Science Bv

Publisher place

Amsterdam

Published in
2013 ISES Solar World Congress
Total of pages

10

Series title/Series vol.

Energy Procedia

Volume

57

Start page

487

End page

496

Subjects

concentrated solar power (CSP)

•

thermal annealing

•

tube

•

XPS

•

ToF-SIMS

•

spectrophotometry

•

Cu-Co-Mn-Si-O

•

stainless steel

•

sol-gel dip-coating

•

thin films

•

Black selective surface

•

Solar absorber coatings

•

Sol-gel

•

Induction heating

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LESO-PB  
Event nameEvent placeEvent date
ISES Solar World Congress

Cancun, Mexico

November 3-7, 2013

Available on Infoscience
January 13, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/99443
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