Viessmann VITOSOL 100-F SV Technical Manual page 6

Principles
Together with Viessmann heating systems, solar thermal systems cre-
ate an optimum system solution for DHW and swimming pool heating,
central heating backup and other applications.
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1.1 Viessmann collector range
Flat-plate and vacuum tube collectors from Viessmann are suitable for
DHW and swimming pool heating, for central heating backup, as well
as for the generation of process heat. The conversion of light into heat
at the absorber is identical for both types of collector.
Flat-plate collectors are easily and safely installed above and integra-
ted into domestic roofs. Increasingly, collectors are also mounted on
walls or as floorstanding units. Flat-plate collectors are more affordable
than vacuum tube collectors. They are used for DHW heating systems,
swimming pool heating and for central heating backup.
In vacuum tube collectors, the absorber is similar to a Thermos flask
in that it is set into an evacuated glass tube. A vacuum has good ther-
mal insulation properties. Heat losses are therefore lower than with
flat-plate collectors, especially with high inside or low outside temper-
atures, i.e. under the particular operating conditions that are to be
expected when heating or air conditioning a building.
In Viessmann vacuum tube collectors, every vacuum tube can be rota-
ted. This means the absorber can be optimally aligned to the sun even
in unfavourable installation situations. Vitosol 200-T vacuum tube col-
lectors, type SP2A and type SPE, which use the heat pipe principle,
can also be mounted horizontally on flat roofs. The yield per m
lector area is a little reduced in this case, but this can be offset by a
correspondingly larger collector area. The Viessmann "ESOP" calcu-
lation program produces a yield comparison.
VIESMANN
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This technical guide includes a summary of all technical documents
for the required components, as well as design and sizing information
especially for systems for detached houses. This technical guide is a
product-related addition to Viessmann's "Solar thermal systems" tech-
nical guide. You can obtain a printed version from your Viessmann
sales consultant or download it from the Viessmann website
(www.viessmann.de), where you will also find electronic aids regard-
ing collector fixing and maintaining the correct pressure in solar ther-
mal systems.
Flat-plate collectors cannot be mounted horizontally, as the glass
cover cannot be kept clean simply through rain, and the venting of the
collector would be more difficult. Vitosol-F, type SH and Vitosol 200-T,
type SP2A can also be installed on walls. When installed parallel to a
wall (facing south), on an annual average, approximately 30 % less
radiation hits the collector than in installations on 45° supports. If the
main period of use falls in spring, autumn or winter (central heating
backup), higher yields may still be achieved from the collectors, subject
to the prevailing conditions. It should be noted that installation on walls
is subject to certain legal requirements. For the rules regarding the
implementation of collector systems, see the "technical rules for the
use of linear supported glazing" (TRLV) issued by the Deutsches Insti-
tut für Bautechnik (DIBT) (see chapter "Technical Building Regula-
tions").
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VITOSOL