CONSTRUCTION'S CHARACTERISTICS

The solar collector consists of a number of double-cavity borosilicate glass tubes welded at the ends and internally evacuated. The inner cavity is designed to selectively absorb the sun’s electromagnetic radiation by a special multilayer metal coating created with recyclable materials made of aluminium and nitrogen.

The absorbing unit consists in a U-shaped copper circuit that is placed in contact with aluminium heat absorbers whose purpose is to increase the heat-exchange surface. The entire length of each unit is enclosed in single glass tube, and each unit is connected in parallel to a collector at the head of the collector.

The metal frame is made of electrocoated aluminium profiles that are resistant to salt spray corrosion. The distribution manifold is protected by an aluminium structure completely insulated by Class 0 incombustible, waterrepellent and low-biopersistence insulation (ISO - DIS 1182.2). The collector beneath the tubes is made of low-iridescence, laminated reflective aluminium (standards EN 573/3, EN 485/2, EN 485/4 and standard DIN 50943 test for anodic oxidation), specifically built to reflect more than 90% of the total light and with CPC (Compound Parabolic Concentrator) design.

MATERIALS

Absorber

Selective coating: multilayer AlNX/Cu electrodeposition
Absorption coefficient: > 94 %
Emission coefficient: < 6 %

Glass Tubes

Material: borosilicate glass thickness 1,70 ± 0,15 mm
SABS impact resistance
Insulation: high vacuum

Insulation and Casing

Insulating material of collector header: rock wool
Frame material: electrocoated aluminium