VRK-Vacuum tube collector
1. TECHNICAL DESCRIPTION
A special modular mounting system was developed for the series which makes it possible to realise standalone and roof-mounted solutions with equal ease.
Maximum efficiency is ensured irrespective of the sunlight's angle of incidence. The shape of the reflector corresponds with the form of the vacuum tube to achieve maximum efficiency. A mirror/absorber geometry was realised which brings about optimal concentration of the solar energy.
2. TECHNICAL DESCRIPTION OF THE COMPONENTS
2.1 Housing
| Profiles: | Saltwater-proof aluminium profiles |
| Material: | AlMgSi 0,5 F22 |
2.2 Covering of collecting line
Extruded and anodized aluminium profiles
2.3 Absorber
| Header tubes: | 18 x 1,0 mm |
| Manifolds: | 8 x 0,5 mm; |
| Absorber: | Aluminium 0,3 mm |
| Connections: | Flat-sealing 3/4" DM 18 screw couplings |
2.4 Insulation
Absorbers are insulated by the vacuum tube, headers are insulated by mineral wool.
2.5 Vacuum tube
| Material: | Borosilicate glass |
| O.d./i.d./wall thickness of tube: | 47 mm x 37 mm x 1,5 mm |
| Length of tube: | 1520 mm |
| Weight of tube: |
1,2 kg |
2.6. Parabolic mirror
High gloss PVD coated parabolic mirror.
Reflectance: approx. 95%
2.7. Other
Type plate: UV-proof and weatherresistant silverployester sticker
Packing: The collectors are screwed to each other (max. 9 pieces, depending
on dimensions) standing in a package.
3. TECHNICAL DATA
| Number of tubes: | 10 | 14 |
| Overall area [m²] | 1,84 | 2,57 |
| Absorber area [m²] | 1,69 | 2,36 |
| Aperture area [m²] | 1,60 | 2,23 |
| Dimensions [mm]: | ||
| Length | 1120 | 1560 |
| Width | 1647 | 1647 |
| Height | 107 | 107 |
| Overall collector weight [kg] | 31 | 42 |
| Absorber capacity [l] | 1,63 | 2,27 |
| Selective Coating |
High selective vacuum coating |
|
| Absorption | 96,0 +/- 1% | |
| Emission | 6,0 +/- 1,0 % | |
| Stagnation temperature: | max. 270°C | |
| Max. operating pressure: | 10 bar | |
| Design approval No.: | TÜV 02 - 228 - 744 | |