Vaillant Solar hot water systems, Системное руководство

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Manual - Solar hot water systems 8
4 Description of the components
4.1 Collectors
H
Danger!
Risk of burns!
To avoid injuries due to hot parts of the
collectors, all work on the collectors should be
carried out on cloudy days. Alternatively work
can be carried out in the morning or evening of
sunny days or with the collector covered.
4.1.1 auroTHERM exclusive tube collector
Fig. 4.1 auroTHERM exclusive VTK 550 tube collector
Fig. 4.2 auroTHERM exclusive VTK 275 tube collector
Interior design
The Vaillant auroTHERM exclusive VTK 275 and 550
tube collectors consist of 8 or 16 collector tubes
connected in parallel. With its collector tubes with
internal mirror of pure silver and glass-glass connection
of sleeve and absorber pipe for lasting vacuum sealing,
the collector ensures constant high performance over its
entire service life. The high-performance absorber has a
Cermet Aluxid
® vacuum coating. Extremely low heat
losses of k
1
= 0.68 W/(m 2 K) thanks to a high vacuum of
< 10 -6 bar ensure year-round use.
By deliberately interrupting heat transfer to the
downstream system, the auroTHERM exclusive provides
effective system protection against excess temperatures
above 180 °C if the system is shut down.
The collectors are connected in series.
1 2
5 6
3
4
Fig. 4.3 Cross-section through four tubes with direction of flow
Key
1 Outer collector tube
2 Inner collector tube
3 Guide
tube
4 Absorber tube
5 Outlet
6 Inlet
4 Description of the components