Vacuum tube collectors achieve higher efficiency compared to flat plate solar collectors. The advantage of this type of solar collector is efficient operation at low ambient temperatures. The vacuum collector is separated from the surrounding environment by a vacuum space, which allows heat losses to the environment through conduction and convection to be almost completely eliminated.
The absorber surface, which converts solar radiation energy into heat, has a cylindrical shape. Therefore, the area illuminated by the sun remains constant in the morning, at midday and in the evening. The collector's heat output does not change depending on the angle of incidence of the sun's rays, which is characteristic of flat plate solar collectors. The special inverted hydraulic connection design in the KSR10 collector protects the circulating fluid from overheating during the stagnation stage.
A significant advantage of the Hewalex KSR10 solar collector is the possibility to install it in any position (without a slope), which allows this collector to be mounted on a building facade. Individual tubes can be rotated to compensate for an unfavourable position relative to the angle of incidence of the sun's rays.
We offer various types of mounting, both for installation on a sloped roof, flat roof, facade or on the ground.
HEWALEX vacuum collectors have the following advantages:
- Efficiency of 85%
- Vacuum tubes manufactured by the leading European tube manufacturer NARVA (Germany)
- Absorbers made entirely of copper and coated with a PVD layer (TiNOX Classic)
- Additional anti-reflective coating on both sides increases the transmission of solar radiation to the inside of the glass tube by approximately 5%
- Special protection in case of overheating – steam pushes the glycol out of the collector
- Excellent price-to-output ratio and overall annual yield
- Very versatile solutions. The collector tubes can be rotated to face directly towards the southern sun
- Tubes do not shade one another at a low sun angle