Control of infrared emittance of stainless steel using sputtered tungsten thin films for solar thermal power applications

Barshilia, Harish C and Sibin, K P (2013) Control of infrared emittance of stainless steel using sputtered tungsten thin films for solar thermal power applications. Project Report. National Aerospace Laboratories.

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Abstract

Low infrared (IR) emittance is the key factor of a solar collector. Our primary motivation for carrying out this work has been to lower the IR emittance of stainless steel substrate (intrinsic emittance = 0.12-0.13) by coating a thin film of high IR reflecting tungsten. Tungsten thin films were deposited on stainless steel substrates using a glow discharge magnetron sputtering system. Low emittance tungsten coating (0.03) was obtained by varying the thickness of tungsten coating. The influences of structural, morphological and electrical properties of the tungsten coating on its emittance values were studied. The effect of substrate roughness on the emittance of tungsten coating was also examined. Thermal stability of the tungsten coatings was studied in both vacuum and air.

Item Type: Monograph (Project Report)
Subjects: RENEWABLE ENERGY > Solar Energy
Depositing User: Dr. Harish C. Barshilia
Date Deposited: 29 May 2013 04:18
Last Modified: 29 May 2013 04:18
URI: http://nal-ir.nal.res.in/id/eprint/11701

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