Analysis of the variation in surface roughness of a glass sheet after hot bending
This paper analyses the surface roughness of a solar concentrating mirror with a deflection surface. The mirror is manufactured by a non-contact hot bending process with a hollow mold. The surface roughness (Ra) of the glasses is analyzed and estimated before and after the hot bending process using statistical sampling techniques and non-parametric hypothesis testing. The aim is to verify whether the fabricated mirror can specularly reflect the high energy band of solar radiation. Within a certain temperature range, the hot bending process altered the Ra by a maximum of 4 nm. Generally, the Ra of a fresh sheet of ultra-clear float glass does not exceed 10 nm. Therefore, the maximum Ra of a deflection surface constructed from this float glass is 18 nm, sufficiently low for specular reflection at solar wavelengths exceeding 0·3 μm. Such wavelengths account for more than 99% of the total solar energy.
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Document Type: Research Article
Publication date: December 1, 2015