H Vacuum Tube Collectors; Vitosol 200 Direct Flow Vacuum Tube Collector - Viessmann Vitosol
100 Technical Manual

Vacuum tube collectors
Vacuum tube collectors are used for
domestic hot water and swimming pool
heating and, to a limited degree, for
central heating.
Vitosol 200 direct flow vacuum tube collector
F Connection pipe
G Thermal insulation
H Profile clip
K Connection housing
VITOSOL
2.1 Construction and function of the collectors
Vacuum tube collectors provide higher
levels of efficiency than flat collectors in
case of greater differences between
collector temperature and ambient
temperature as well as for diffused
radiation.
A
B
C
D
E
A Flow pipe (outlet)
B Return pipe (inlet)
C Coaxial heat exchanger pipe
D Absorber
E Evacuated special glass tube
Vitosol 200
On an annual average, a solar energy yield
2
approx. 30 % higher per m aperture area
can be expected than for flat collectors
with comparable surface area.
The tube shape gives the collector great
stability.
Re−evacuation of the tubes is not
necessary as the tubes have a permanent
airtight seal.
The vacuum in the glass tubes ensures
optimum heat insulation. Convection
losses between the glass tube and the
absorber are almost completely
eliminated. This enables the utilisation of
even low radiation levels (diffused
radiation).
Built into each vacuum tube is a
Sol−Titanium coated copper absorber.
It ensures high absorption of solar
radiation and low emission of thermal
radiation.
A coaxial heat exchanger pipe is fitted to
the absorber, through which the process
medium flows.
The process medium picks up the heat
from the absorber via the heat exchanger
pipe.
The heat exchanger pipe feeds into a
header.
Deviations from south can be
compensated by axial rotation (max. 25º)
of the vacuum tubes.
Absorber surface areas up to 6 m
connected in parallel and absorber
surface areas upwards of 6 m
in series (see installation examples on
page 45 and 46) to form a collector array.
For this purpose, the standard delivery
includes flexible connection pipes, sealed
with O−rings.
A connection kit with clamping ring
fittings enables the collector array to be
quickly connected to the pipes of the
solar circuit.
The collector temperature sensor is
installed in a sensor mounting on the
flow pipe in the collector connection
housing.
2
can be
2
connected
11