Vibration Solutions for Heating,
Ventilation and Air Conditioning

Reduce noise efficiently© Primus Developments

Noticeably minimise vibrations

Satisfy the highest comfort
requirements

Noise is a key issue now andwill remain so in the future.

Noise as a challenge
We are moving ever closer together inurban areas – living, working, sports
and leisure facilities are being built
in close proximity and are increasingly coming together under one roof. At
the same time, we enjoy the comfort
afforded by modern building technology, delivered by devices that do
not operate silently. All this leads to a
growing potential for conﬂict because
people are becoming increasingly
aware of noise as a disruptive factor.

The route to quieter devices

ComfortAirborne noise and structure-borne
noise: a holistic view of noise“The heat pump is noisy. It hums. I
can’t sleep.” Acoustic hoods are frequently used as solutions in such cases, whereby direct noise (airbornenoise) is rarely the trigger of theproblem, and such measures are nottarget-oriented.1

Awareness of noise

Urbanisation

A very large number of the noise events thatreach our ears are generated or propagated byvibrating solid objects [...]. Protection against
the generation and transmission of structureborne noise is therefore of central importance.2

Efﬁcient vibration isolation reduces
airborne and structure-borne noise
Well-designed insulation prevents thetransmission of vibrations to adjacentparts of the building and, as such, theformation of structure-borne noise(secondary airborne noise). Furthermore, the correct bearing of components, such as the compressor or thefan, reduces the excitation of housingparts and therefore has a direct inﬂuence on the primary airborne noise.

12

www.getzner.com[Determination and evaluation of low-frequency noise in the vicinity of residential buildings], Federal Environment Agency, 2020
Cremer, Heckel (2009): [Structure-borne noise – physical fundamentals and technical applications], newly edited by M. Möserand W. Kropp, 3rd updated edition, ISBN 978-3-540-40336-4, Springer Verlag

2Our solutions for yourHVAC equipment

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Air handling units
Modern air handling units (AC) or air conditioning units
are usually installed on mezzanine ﬂoors or on the roof.
The fans, in particular, but also the air ﬂows themselves,
generate vibrations that can be heard in adjacent rooms
as structure-borne noise.

2Fans
Fans generate noise and vibrations due to rapid rotations,imbalances of the impeller or the drive motor.
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Lift systems
During lift system operation, the starting, stopping andgeneral movement of the cabin generate vibrations thatare transmitted to the structure of the building and perceived as structure-borne noise.

4Transformers
Structure-borne noise is transmitted from the transformer core via the contact surfaces (e.g., the rollers) into thefoundation. The operation of transformers within buildings
or in the immediate vicinity of buildings is therefore often
perceived as unpleasant and disturbing in residential areas
and workplaces.

5PipesPipes in building services equipment leading from or toenergy sources (AC, CHP, etc.) generate structure-borne
noise and must be considered as a whole when decoupling
the system from structure-borne noise.

6Chillers
Refrigeration systems and units are usually installed on theroof. The fans and/or compressor used generate strong vibrations, which are introduced into the building structure if
there is no elastic bearing.
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Heat pumps
Heat pumps develop vibrations and structure-borne noise,
primarily due to the compressors used.

8Compressors
Compressors are found as components in various systems,
such as heat pumps or air conditioning units. The vibrations to be decoupled are caused by the compression process of the refrigerant.

9PumpsPumps usually convey liquid media with different viscosities. Depending on the medium, pressure and conveying
distance, extensive structure-borne noise insulation must
be considered.

10Combined heat and power plants
In addition to the emergency power supply, e.g. in hospitals,power generators with combustion engines are also used
as cogeneration plants for simultaneous heat recovery.
These generate high levels of structure-borne noise andstrong vibrations due to their large, moving masses andaccelerations.
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5How you benefit
from our solutions

The Isotop series combines the polyurethane materials
Sylomer®, Sylodyn® and Sylodamp® from Getzner withmetal elements and screw connections.
Installing the products is therefore convenient and time-efficient, making them ideally suited for use in building technology. Isotop® provides you with unique advantages whenused as a machine bearing under your HVAC equipment.

Quieter equipment thanks toefficient vibration isolation

Reduced secondary airborne noise
even in critical installation locations(e.g. roof-top installation, mezzanine floors, etc.)

Time and cost savings during
design, procurement and installation

Reducedmaintenance costs

All products at a glance
Find out more in our product catalogue or use ourEquipCalc online selection program.
Product catalogue:
Machine bearings for building services equipment
www.getzner.com/catalogue-hvac
Further documents such as brochures, measurement
reports and application descriptions can be found inour download area underwww.getzner.com/downloads

www.getzner.com

6Efficient vibration isolation –thanks to Getzner polyurethane

Material with unique properties

Transfer coefficient in dB

Polyurethane (PU) brings with it themajor advantage that it softens under dynamic stress. Compared to other materials (in particular rubber), itachieves a higher insulating effectduring the operation of classic HVAC
equipment.

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Vibration isolation simply explained
The decisive factor for efficient vibration isolation is the ratio of the excitation frequency (fe ) and the natural frequency of the vibration isolation (f0)Range of vibration isolation
for fe >1.41*f0

100

ƞ = fef0

Resonance
at naturalfrequency f0-10

If the ratio is 1, the device is in resonance and swings back and forth. The
vibration isolation becomes effectiveat a ratio of 2.

-20-30Resonance
range
Vibration isolation-40
0510152025303540455055606570

Excitation frequency fe in Hz

An efficient vibration damper:— Offers a low natural frequency— Is durable and long-lasting— Ensures constant, efficient vibration
isolation

Find your solution
With our EquipCalc online selection tool, you can find the right Isotop
machine bearing for your application – it’s quick, easy and always
up-to-date.
Find more information on this topic at
www.getzner.com/calculation-tools

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7Developed
and produced
at the heartof Europe

We are the world’s leading expert in vibration isolation, thanks to many yearsof experience in the development, production and application of our materials.
This expertise allows us to design the materials in a wide variety of shapes andgradations. With our Sylomer®, Sylodyn®, Sylodamp® and Sylocraft® materials,
we cover a wide range of properties – from springy to damping. When connectedwith metal springs and elements, they become Isotop machine bearings that areeasy to install.
No softeners are used in the production of polyurethane, meaning it does not
become brittle and the chemical composition and material properties remain
constant for decades, regardless of the ambient conditions.

We are the leading specialist in
vibration protection and ...

... reducing
vibrations... lowering noiselevels

We have been making use of these properties for over 50 years. Our customers benefit from our customised services, while our calculation programs facilitate independent layout and design. Our experts will be happy to support you ifrequired.

... reducing
maintenanceand service
requirements

We look forward to hearing from you.

... extending
the service
life of bedded
components

Getzner Werkstoffe GmbHHerrenau 56706 Bürs, AustriaT +43-5552-201-0
info.buers@getzner.com

Getzner spring Solutions GmbH
Gottlob-Grotz-Str. 1
74321 Bietigheim-Bissingen, Germany
T +49 7142 91753-0
info.stuttgart@getzner.com

Contact form
www.getzner.com/contact

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