Press
Solar heating from Viessmann: innovative
collectors for DHW generation and auxiliary
heating
What’s new at a glance:
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ThermProtect, the innovative automatic shut-off, now
protects not only Viessmann flat-plate collectors from
overheating, but Vitosol vacuum tube collectors, as well.
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The two new vacuum tube collectors Viessmann is now
presenting, Vitosol 300-TM and Vitosol 200-TM, are the
first of their kind in the world: both heat pipe collectors have
ThermProtect temperature shut-off and can be installed in
any position – even horizontally.
ThermProtect: automatic overheating protection
for flat-plate and tube collectors
By equipping the Vitosol 200-FM and 100-FM flat-plate collectors
with the ThermProtect temperature shut-off – the first and only one
of its kind in the world – Viessmann already set a milestone in the
efficiency and operational reliability of solar thermal systems. Now
the new Vitosol 300-TM and 200-TM vacuum tube collectors also
feature this automatic shut-off to reliably prevent the collectors
from overheating.
Heating systems
Industrial systems
Refrigeration systems
Solar thermal systems with ThermProtect: durable and
reliable
With ThermProtect, even large collector surfaces can be planned
without having to worry about stagnation. This Viessmann
technology shuts off the collectors as soon as they reach a preset
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
temperature limit. The temperature shut-off on Vitosol flat-plate
and tube collectors works completely independently of the system
configuration, control setting, and installation position of the
collectors. The thermal loads on the system components and on
the heat transfer medium always stay within normal range. This
makes them last longer and work more reliably compared to
conventional solar thermal systems.
Reduced installation outlay
The installation outlay is reduced because auxiliary vessels and
stagnation coolers are no longer required. What is more, since
there are no longer any worries about the heat transfer medium
giving off vapor with the Vitosol 300-TM, 200-FM, and 100-FM
collectors, the hydraulic lines can be laid in many more different
ways.
Vitosol 200-FM and 100-FM: crystals prevent overheating
In the Vitosol 200-FM and 100-FM flat-plate collectors, a
crystalline absorber coating regulates the energy input. The
ThermProtect coating functions physically by means of
temperature-dependent changes in the crystal structures. Above a
collector temperature of about 75 °C, these crystal structures
reflect more of the solar radiation striking them. A further rise in
temperature is limited, thus reliably preventing vapor formation.
If the temperature in the collector falls again, the crystal structure
returns to its original state. The energy absorbed by the collector is
no longer radiated back into the surroundings and can be used in
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the solar thermal system. The change in the crystal structure is
indefinitely reversible and the function is therefore permanently
available.
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
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Vitosol 300-TM and 200-TM: heat pipes with temperature shutoff
In the new Vitosol 300-TM and 200-TM vacuum tube collectors,
the ThermProtect temperature shut-off takes over a self-regulating
heat pipe, which is integrated into the heat exchanger of the
collector by means of a dry connection. The solar heat vaporizes
the medium trapped inside the heat pipe. During the following
liquefaction in the condenser, the heat is released back to the
solar thermal system and the medium flows back into the sunlit
area of the vacuum tube.
When a temperature limit of approx. 120 °C is reached, the
medium can no longer condense. This phase-change temperature
shut-off interrupts the heat transfer and thus protects the system
from excessive stagnation temperatures. The cycle in the heat
pipe does not restart until the collector temperature is low enough
and solar heat is again transferred into the heating system.
Reliably avoid overheating
A solar collector generates heat whenever sunlight strikes the
absorber – even if this heat is not needed. So conventional
collectors without temperature shut-off can be expected to
overheat and form vapor especially in summer, when they remain
unused for long periods of time. For example, when the
homeowner is on vacation and the solar heat is not being used in
the house: the circulation pump switches off and the solar thermal
system goes into stagnation. If the sun keeps shining, the rise in
collector temperatures can cause the heat transfer medium to
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vaporize and put a high thermal load on such system components
as seals, pumps, valves, and the heat transfer medium. Vapor can
be reliably avoided in systems with a higher system pressure (for
example, 3 bar) and collectors that switch on and off.
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
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Advantages for trade partners
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High operational reliability and long lifespan of all
components thanks to lowering the stagnation temperature
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Independent of collector installation position, control
settings, electricity supply, and mechanical devices
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Considerable reduction in thermal load on system
components.
Advantages for users
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Longer lifespan of all system components thanks to low
thermal load
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Higher system availability and greater energy utilization
thanks to quicker collector restart
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ThermProtect temperature shut-off on all standard
collectors is purely physical and self-regulating without any
additional external components and auxiliary energies
Technical data
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Collector surface: 2.3 m2 (flat-plate collectors)
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Collector surface: 1.26 to 3.26 m2 (vacuum tube collectors)
Delivery date
The Vitosol 200-FM and 100-FM flat-plate collectors have already
been launched on the market. The new Vitosol 300-TM and 200TM vacuum tube collectors will be available starting in April 2017.
Heating systems
Vitosol 300-TM: new heat pipe collector that can
Industrial systems
Refrigeration systems
be installed regardless of position
The new Vitosol 300-TM is the world’s first vacuum tube collector
to have the ThermProtect automatic overheating protection that
reliably prevents vapor formation in the solar thermal system, and
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
which can be installed horizontally. It thus unites three outstanding
characteristics in a single product: high output, reliably protection
from overheating, and great flexibility. The collector, which can be
installed regardless of position, is designed for use in single-family
homes and large residential buildings.
Horizontal heat pipe
Vitosol 300-TM works on the heat pipe principle, in which the solar
medium does not flow directly through the tubes. Instead, a
separate medium vaporizes in the heat pipe and releases the heat
to the solar medium through condensation by way of the Duotec
twin-pipe heat exchanger. The design of the heat pipe allows the
collector to be installed in practically any position – vertically or
horizontally on slanting roofs, horizontally on balcony balustrades,
lying or standing on flat roofs.
High solar yields
Almost all the solar radiation striking the surface of the glass tubes
is retained by the absorbers inside them with their selective
coating. The vacuum ensures that hardly any heat is lost to the
surroundings. This substantially increases the Vitosol 300-TM’s
solar yield compared to an equivalent surface area of conventional
collectors. This collector needs no mirrors behind the absorber,
which unavoidably diminish in effectiveness as they get dirty over
time. The permanently evacuated tubes and the collector
enclosure insulated with melamine foam, an excellent thermal
insulation material, guarantee that almost all the heat is transferred
to the solar thermal system with little loss.
The absorbers can be adjusted toward the sun in order to increase
the solar heat yield, depending on the installation position. For this
purpose, the individual tubes can be turned axially by plus-minus
25 degrees.
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Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
Advantages for trade partners
-
A world first – horizontal heat pipe with ThermProtect
temperature shut-off
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Unlimited uses because installation is possible in any
position
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Considerably lower loads on system components thanks to
ThermProtect
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Temperature shut-off functions regardless of control
settings, electricity supply, and mechanical components
(for example, valves)
-
Easier system planning
-
Flexible product selection thanks to various collector sizes
Advantages for users
-
Long lifespan of the system thanks to low stagnation
temperatures and avoidance of vapor formation
-
Protected from overheating during long periods of sunshine
when no heat is being used
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Self-sufficient function – ThermProtect is always
operational
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Fast restart after system standstill
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Enhanced auxiliary solar energy to cover heating and DHW
generation thanks to larger collector surface
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Low operating costs thanks to long durability of solar
components
Heating systems
Technical data
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Collector surface: 1.26, 1.51 and 3.03 m2
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Operating pressure: 3 bar
Industrial systems
Refrigeration systems
Viessmann Werke GmbH & Co. KG
Delivery date
The new Vitosol 300-TM vacuum tube collector will be launched
on the market in April 2017.
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
Vitosol 200-TM: vacuum tube collector with
ThermProtect for larger solar thermal systems
Large solar thermal systems are often affected by stagnation in the
warm months of summer. Hence the new Vitosol 200-TM has
been designed especially for large residential buildings, schools,
and commercial buildings. It also has ThermProtect to prevent
overheating and can also be horizontally mounted on flat roofs
because its absorbers can turn 45 degrees.
Absorber can turn up to 45 degrees
The heat pipe in the new collector is designed to be installed in
nearly any desired position – even horizontally, with simultaneous
temperature shut-off by ThermProtect. The solar heat is released
to the solar medium from the heat pipe by having the medium
inside it vaporize and then condense in the copper heat exchanger.
Thanks to their dry connection with the vacuum tubes, the
absorbers can be turned by up to 45 degrees even during
operation. This enables them to be adjusted exactly to the sun with
a minimum of shading.
Maximum utilization of solar energy
Inside the Vitosol 200-TM vacuum tubes are absorber plates with
a highly selective coating. High solar heat yields are achieved in
combination with the permanently evacuated tubes and the heat
insulation on the collector enclosure. The collector can therefore
convert even low levels of solar radiation into useable heat. Mirrors
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that direct additional sunlight onto the absorbers are not needed in
the Vitosol 200-TM.
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
Advantages for trade partners
-
A world first – horizontal heat pipe with ThermProtect
temperature shut-off
-
Considerably lower loads on system components thanks to
ThermProtect
-
Self-sufficient temperature shut-off – regardless of control
settings, electricity supply, and mechanical components
(for example, valves)
-
Easier system planning
-
Especially well-suited for large systems and horizontal
installation on flat roofs
-
Reduced ballast when installed horizontally
-
Flexible product selection thanks to various collector sizes
Advantages for users
-
Long lifespan of the solar thermal system thanks to low
stagnation temperatures
-
Protection from overheating during long periods of solar
radiation
-
Self-sufficient function – ThermProtect is always
operational
-
Fast restart after system standstill
-
Enhanced use of solar energy thanks to larger collector
surface
-
Low operating costs thanks to long durability of solar
components
Heating systems
Industrial systems
Technical data
-
Collector surface: 1.63 and 3.26 m2
-
Operating pressure: 1 bar
Refrigeration systems
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
Delivery date
The new Vitosol 200-TM vacuum tube collector will be available
starting April 2017.
Images / captions
Fig. 1: Viessmann offers a comprehensive program of various
Vitosol flat-plate and vacuum tube collectors, all of which have a
ThermProtect temperature shut-off to protect against overheating.
Fig. 2: During regular collector operation, the ThermProtect
coating on Viessmann’s Vitosol 200-FM and 100-FM flat-plate
collectors acts like any conventional absorber coating. Above a
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Industrial systems
Refrigeration systems
collector temperature of 75 °C, however, much more radiation is
released, thereby reliably preventing overheating and vapor
formation.
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
Fig. 3: The self-regulating heat pipe in Viessmann’s Vitosol 300TM and 200-TM vacuum tube collectors: when the temperature
limit of approx. 120 °C is reached, the medium can no longer
condense, thus interrupting the heat transfer and protecting the
system against excessively high stagnation temperatures.
Fig. 4: The new Vitosol 300-TM from Viessmann is the world’s first
vacuum tube collector to have ThermProtect automatic
overheating protection to reliably prevent vapor formation, and can
also be installed horizontally.
Heating systems
Industrial systems
Refrigeration systems
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de
Press
Fig. 5: Viessmann’s new Vitosol 200-TM vacuum tube collector is
designed primarily for larger systems and for horizontal installation
on flat roofs.
March 2017
Heating systems
Industrial systems
Refrigeration systems
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone: +49 (0)6452 702533
[email protected]
www.viessmann.de