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REFLECTIVE SURFACES
The highly reflecting vega energy specular surfaces are a key component of concentrating solar systems.  They concentrate the solar radiation precisely to achieve extreme energy densites. By using vega energy mirrors with their outstanding  reflecting properties the  performance can be increased significantly  in concentrating parabolic  systems  (CSP) for the generation  of solar  thermal electricity,  or process heat for industrial  applications, air conditioning or sea water  desalination.
VEGA FLEX

vegaFLEX is a complete system for parabolic trough concentrators that combines the ultra-reflective vega energy coating from the ALMECO Group with aluminum-reinforced composite plates.
The result is a complete mirror element that manufacturers of CSP plants can quickly and easily install on support systems without any further ado. 

The system keeps its shape extremely well because all of the components have the same thermal expansion coefficient. In addition, vegaFLEX is extremely lightweight and robust, which lowers the installation and maintenance costs of CSP plants considerably.

With a solar reflection rate exceeding 93%, ALMECO's mirror layer ensures that parabolic trough plants can make optimal use of solar energy. As a result, the performance of CSP plants increases significantly. 
At the same time, an innovative ceramic layer reliably protects the reflectors from rain, sand, and salt to keep performance high; ALMECO guarantees that the degree of reflection will not drop by more than 3% in 10 years. 

vegaFLEX gives manufacturers of CSP plants a lot of leeway in designing their systems. 
The curvature and dimensions of the concentrators can be adjusted to fit the requirements of the specific installation exactly, with troughs of up to 6.5 meters in width. 
vegaFLEX is also excellent for small solar air-conditioning systems (used, for instance, in hotels and commercial buildings) and for process heat (in the food industry and for solar-powered desalination systems, to take two examples); its mirror elements can be manufactured even with a tiny curvature radius of ten centimeters.

VEGA FLEX

Technical reflectance characteristics
Property Typical value Standard
Solar reflectance
= 89%
ASTM 891 - 87
Total reflectance (visible range)
= 93%
DIN 5036-3 ASTM E 1651
Specular reflectance
= 87%
ISO 7668
Spectral reflectance
See graph below
Focus on target
= 99,8%
Profilometer ENEA
Table

Physical properties
Property Typical value Standard
Specific weight
6 - 8 kg/m² *
-
Transverse stiffness
1.8 -3.5 kNm²/m*
UNI EN 63-DIN 53293
Longitudinal Stiffness
3.5 – 21.5 kNm²/m*
UNI EN 63-DIN 53293
Impact resistance
No breakage or coating failure
ISO 6271-1
Thermal expansion
23,5 x 10-6 / °C
-
Surface hardness
> 7H pencil hardness
ISO 15184
* depending on thickness

Durability
Property Typical value Standard
Coating adhesion
No failure on cross hatch test
ISO 2409
UV resistance
< 3% reflectance change in 3000 h
ISO 4892-3
Neutral salt spray resistance
< 3% reflectance change in 3000 h
ISO 9227 NSS ASTM B 117

vegaFLEX 939
Nominal thickness
mm
Effective thickness
mm
Specific weight
kg/m²
Rigidity E x I Nm²/m
tool parallel
to corrugation
Rigidity E x I Nm²/m
tool perpendicular
to corrugation
10
11 6,78
1768
3311
15
15,2 6,94
3100
6743
18
17,9 6,98
3074
9497
20
20 7,3
3086
12103
25
25 8,16
3200
18024
X
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