A method for measuring thermal radiation properties of semi-transparent materials

Plastic films that are semi-transparent in the infrared are extensively used in solar energy applications and as mulches in agriculture. For analysing the performance of such systems, it is important to know their thermal radiation properties. Whereas transmissivity can be determined easily, measure...

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Bibliographic Details
Published in:Measurement science & technology 1994-09, Vol.5 (9), p.1061-1064
Main Authors: Zhang, Y P, Ge, X S, Huang, H L
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Heat transfer
Physics
Thermal properties of condensed matter
Thermal radiation
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Summary:Plastic films that are semi-transparent in the infrared are extensively used in solar energy applications and as mulches in agriculture. For analysing the performance of such systems, it is important to know their thermal radiation properties. Whereas transmissivity can be determined easily, measurement of emissivity poses a problem. The intensity usually consists of radiation emitted from the film and transmitted background radiation. A method for determining the hemispherical total emittance, reflectance and transmittance of plastic films simultaneously is presented. (Original abstract-amended)
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/5/9/005