Hemispherical Total Emissivity of Potential Structural Materials for Very High Temperature Reactor Systems: Haynes 230

The hemispherical total emissivity of Haynes 230, which is regarded as a leading candidate material for heat exchangers in very high temperature reactor (VHTR) systems, was measured with various surface conditions using the ASTM C 835-06 protocol. The emissivity increased from 0.18 at 627 K to 0.235...

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Bibliographic Details
Published in:Nuclear technology 2012-09, Vol.179 (3), p.429-438
Main Authors: Maynard, Raymond K., Mokgalapa, Naphtali M., Ghosh, Tushar K., Tompson, Robert V., Viswanath, Dabir S., Loyalka, Sudarshan K.
Format: Article
Language:English
Subjects:
Applied sciences
Devices using thermal energy
Emissivity
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Fuels
Graphite
Heat exchangers (included heat transformers, condensers, cooling towers)
Installations for energy generation and conversion: thermal and electrical energy
Nuclear engineering
Nuclear fuels
Nuclear power generation
Nuclear reactor components
Nuclear reactors
Nuclear safety
Surface roughness
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Summary:The hemispherical total emissivity of Haynes 230, which is regarded as a leading candidate material for heat exchangers in very high temperature reactor (VHTR) systems, was measured with various surface conditions using the ASTM C 835-06 protocol. The emissivity increased from 0.18 at 627 K to 0.235 at 1356 K for Haynes 230 as received sample. The emissivity increased significantly when its surface roughness was increased, or it was oxidized in air, or it was coated with graphite dust, as compared to the as-received material. Higher emissivity has a positive impact on high-temperature reactor operations, particularly for safety, since higher emissivity implies faster decay heat removal in postaccident VHTR environments.
ISSN:0029-5450
1943-7471
DOI:10.13182/NT11-5