Testing of a new solar coating for solar water heating applications

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Solar Energy

DOI:https://doi.org/10.1016/J.SOLENER.2010.06.003· OSTI ID:21337918

AlShamaileh, Ehab ^[1]

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1. Department of Chemistry, Faculty of Science, The University of Jordan, Amman 11942 (Jordan)

A novel and affordable solar selective coating exhibiting higher solar absorption efficiency compared to the commercial black paint coating used in most ordinary solar water heating systems (SWHSs) has been developed. The coating is fabricated by embedding a metallic particle composed of a nickel-aluminium (NiAl) alloy into the black paint. The optical behaviour of several percentages of the NiAl alloy in the coating is studied using UV-Vis and IR spectroscopies. The chemical composition of the coating was characterized using XRD and thermo-gravimetric analysis (TGA) for both the black and alloy-containing paint. The results allowed deducing that the optimum composition to consider for further testing was 6% NiAl alloy by mass. The applicability of the coating in a real thermosyphonic SWHS was evaluated throughout the year, spanning both hot and cold seasons. It is found that the new coating shows better performance compared to the untreated black paint by an average of 5 C over a period of 1 year. The corrosion resistance of the coating was investigated using electrochemical polarization and weight-loss measurements in the corrosive medium of 3% NaCl in 0.50 M HCl. Higher inhibition efficiency of corrosion was found for the alloy-containing paint compared to the untreated paint by more than 12%. Finally, Scanning Electron Microscopy (SEM) was used to explore the morphology of the modified coating surface, and compared to the untreated surface. (author)

• OSTI ID: 21337918
• Journal Information: Solar Energy, Vol. 84, Issue 9; Other Information: Elsevier Ltd. All rights reserved; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
14 SOLAR ENERGY
SOLAR WATER HEATING
COMPARATIVE EVALUATIONS
PAINTS
SODIUM CHLORIDES
OPTIMIZATION
NICKEL ALLOYS
ELECTROCHEMISTRY
HYDROCHLORIC ACID
SOLAR COLLECTORS
ALUMINIUM ALLOYS
CORROSION RESISTANCE
SURFACE COATING
ABSORPTION
EFFICIENCY
POLARIZATION
CHEMICAL COMPOSITION
MIDDLE EAST
CORROSION PROTECTION
LOSSES
MORPHOLOGY
PERFORMANCE
SEASONS
SURFACES
WEIGHT
OPTICAL PROPERTIES
Metallic alloy particles
Electrochemical polarization