Enhanced Thermal Stability of W-Ni-Al[subscript 2]O[subscript 3] Cermet-Based Spectrally Selective Solar Absorbers with W Infrared Reflectors
Name
Enhanced Thermal Stability of W-Ni-Al2O3 Cermet-based solar absorber.pdf
Description
Main article
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958.47 KB
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Checksum (MD5)
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Author(s)
Cao, Feng
Kraemer, Daniel
Sun, Tianyi
Lan, Yucheng
Chen, Gang
Ren, Zhifeng
Alternative Title
Enhanced Thermal Stability of W-Ni-Al[subscript 2]O[subscript 3] Cermet-Based Spectrally Selective Solar Absorbers with Tungsten Infrared Reflectors
Date Issued
September 2014
Journal
Advanced Energy Materials
Citation
Cao, Feng, Daniel Kraemer, Tianyi Sun, Yucheng Lan, Gang Chen, and Zhifeng Ren. “Enhanced Thermal Stability of W-Ni-Al[subscript 2]O[subscript 3] Cermet-Based Spectrally Selective Solar Absorbers with Tungsten Infrared Reflectors.” Adv. Energy Mater. 5, no. 2 (September 11, 2014): n/a–n/a.
Version
Author's final manuscript
Abstract
Solar thermal technologies such as solar hot water and concentrated solar power trough systems rely on spectrally selective solar absorbers. These solar absorbers are designed to efficiently absorb the sunlight while suppressing re-emission of infrared radiation at elevated temperatures. Efforts for the development of such solar absorbers must not only be devoted to their spectral selectivity but also to their thermal stability for high temperature applications. Here, selective solar absorbers based on two cermet layers are fabricated on mechanically polished stainless steel substrates using a magnetron sputtering technique. The targeted operating temperature is 500–600 °C. A detrimental change in the morphology, phase, and optical properties is observed if the cermet layers are deposited on a stainless steel substrate with a thin nickel adhesion layer, which is due to the diffusion of iron atoms from the stainless steel into the cermet layer forming a FeWO[subscript 4] phase. In order to improve thermal stability and reduce the infrared emittance, tungsten is found to be a good candidate for the infrared reflector layer due to its excellent thermal stability and low infrared emittance. A stable solar absorptance of ≈0.90 is demonstrated, with a total hemispherical emittance of 0.15 at 500 °C.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1002/aenm.201401042
