GMB Solarglas SINA

The microstructure of GMB solar glass SINA is characterised by specially designed forming rollers on both glass surfaces. The surface of SINA is a non-geometrically aligned structure with a typical roughness height (Rz) of approx. 15 μm (taken from a measuring length of 15 mm). The structure demonstrates a high “density” (number of bumps and holes per unit of length) in order to limit direct reflection and hence reduce dazzling to a minimum. The consistent appearance of the glass is guaranteed in so far as the reflection characteristics of the glass are constantly monitored in our in-house laboratory and corrected as appropriate.

The SINA structure with its geometry as explained – besides a high solar rate of transmission for perpendicular solarisation – minimum reflection losses when a higher variation of the solarisation angle from the perpendicular (higher angle factor also called “Incident Angle Modifier” or IAM). Until today, no structured glass has been found which beats these characteristics for the application in conventional flat collectors and PV modules. The excellent angle factor forms the basis for high annual output.

GMB solar glass SINA has been certified as class 1 solar glass by the Institute for solar technology SPF at the HSR Hochschule für Technik Rapperswil (Switzerland).

 

 

 

GMB Solarglas CONE

Solar glass CONE has two differently structured surfaces. One surface has a geometric, pyramid formed structure (see diagram). The other surface exhibits the same microstructure as GMB solar glass SINA. The side with the pyramidal structure is usually oriented towards the absorber. The advantages of the CONE structure are the significant reduction of dazzling effects and the considerably poor view into the inside of the collector. Small shortcomings in the absorption surface (fingerprints, etc.) can therefore be concealed. The angle-dependent transmission of CONE glass lies comparatively lower than SINA glass. Therefore the annual output of collectors which are equipped with CONE glass is somewhat lower than when SINA glass is used. The lower angle factor also shows itself in the appearance of CONE glass in collector fields. From a few metres away, CONE glass collectors appear light grey. Collectors fitted with SINA glass appear much darker, from dark blue to black, depending on the absorption coating.

 

 

 

GMB Solarglas ASTRA

 

GMB solar glass ASTRA has a rough, non-geometric structure similar to SINA on the one side but with a significantly larger roughness height (Rz) of approximately 60 μm (taken from a measuring length of 15 mm). The other surface has the same microstructure as GMB solar glass SINA. ASTRA glass exhibits a similarly high angle factor (IAM) as SINA glass and, therefore is also ideal for use in collectors with the highest performance. The advantages of ASTRA glass also lie in minimal reflection or dazzling and the very poor view into the inside of the collector. As such, small visual blemishes (such as fingerprints) are easily concealed.

Various collector manufacturers use ASTRA glass for the purposes of product diversification and to provide a recognisably visual difference to a collector fitted with SINA glass.

 

 

 

 

Table of technical Data

 

 For SINA, CONE and ASTRA:

 Dimensions width [mm]; length [mm]

 dimensions raw glass

 200 – 2200; 200 – 3300

 dimensions tempered glass

 500 – 1650; 700 – 3000

 thickness

 3.0 mm ‐ 6.0 mm

 


 

Thermal collectors

300 nm -2500 nm (AM 1.5)

Solar transmission

3.2 mm

Solar transmission

4.0 mm

Solar transmission

6 mm

SINA

91.6 %

91.3 %

91.2 %

CONE

91.4 %

91.2 %

 

ASTRA

91.6 %

91.4 %

 

 

Sensitivity on the eyes

D 65

Visual transmission

3.2 mm

Visual transmission

4.0 mm

Visual transmission

6 mm

SINA

92.1 %

91.9 %

91.7 %

CONE

91.8 %

91.7 %

 

ASTRA

92.0 %

92.1 %

 

 

 
 

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