The Innovative System Concept
by Reisner AG
Suzanne Lemken, PR
Reisner AG · Schäferkampstraße 18
Phone +49 (0) 23 01/9 10 13-0
Fax +49 (0) 23 01/9 10 13-39
wk-Werbung · Wolfram Kaden
The Innovative System
Concept by Reisner AG
Even if the individual components
are already available on
the market, it is the system that
provides you with the optimal
benefits. It combines high quality
elements carefully designed and
tested by Reisner AG so that each
individual component is able to
fully unfold its strengths within
the overall system. At the same
time, it remains flexible enough for
integration into a large number of
conceivable operating situations.
After complex and extensive
development work and an intensive
testing phase, Reisner AG is
proud to present “Epsilon“ or “ε“
for short. This pioneering system
concept already yields enormous
energy savings for satisfied
customers, reduces operating costs
to an unprecedented low level,
and sets new standards in handling
as well as maintenance.
Epsilon: Standard for quality
The unusual name “Epsilon“
Reisner AG dubbed its innovation
ready to be launched on the market
has a history...a long history: More
than 15 years ago, the company
Reisner AG set a milestone in terms
of objectivity and transparency,
and effectively introduced the
coefficient of performance from
physics, denoted by the Greek letter
“ε“ (epsilon), to the public debate
concerning refrigeration systems.
This coefficient supplies information
about the cooling or refrigeration
capacity of a system generated with a
certain amount of electrical energy.
The greater the coefficient of
performance, the more efficient the
cooling system. Optimizing just a
few components does not result in
excellent values. Reisner AG made
this clear when the unabashed use
of “turbo compressors“
innovative component can unfold its
strengths only within an harmonious
The Customization to the requirements
of the operator is decisive
factor. This is where the core
competence of Reisner AG has
now been applied to design highly
efficient cooling systems based on
the tried and tested as well as the
εnew for systems tailor-made for any bearing system with digital bearing
sensors keeps the rotor shaft always
at its position and reliably centers
it – even at 48,000 rotations
The Reisner Epsilon compressor per minute. This eliminates
with magnetic bearing, also known friction losses. The compressor
as turbo or the turbocor compressor, performance is continuously
is here the centerpiece of the Epsilon regulated through the rpm and can
systems. The designation “Epsilon“ be adapted directly to all changes
was deliberately selected by Reisner in the cooling load – contrary
AG for the compressor as well as to most screw compressors
for the overall system to signify its that significantly reduce their
performance figure when lowering
The company combines the output. With only 2 ampere, the
compressor with other, new com- compressor requires almost no
ponents and a control technology starting current.
that translates its favorable properties
into actual financial benefits. The Oil-free system
compressor is made by Danfoss Thanks to its non-contact
Turbocor Compressors, Inc. with magnetic bearing, the Epsilon
headquarters in Tallahassee, USA, compressor does not require any
and functions based on the turbine lubricating oil. This yields a variety
of advantages for the entire system.
It suctions the gas axially and For example, no oil-related heat
expels it radially. Unlike conventional losses occur on the heat exchanger
piston or screw compressors, surfaces.
it achieves a dynamic pressure
If a traditional compressor
increase due to the acceleration in is installed, the cooling system
the fan-like impeller wheel. It also requires an oil management system.
features magnetic bearings: its rotor This is a cost saved with the oil-
shaft turns within a magnetic field free Epsilon system. Money is also
completely contact-free. A complex
not spent on oil disposal. Since no
old oil has to be recycled
or treated for disposal, the
environmental impact is
significantly less. Finally, new
are not even possible unless
the system is oil-free – with
Sensor ring Rear radial
decisive subsequent financial
Ring sensor Motor Axial bearing
Vario and Epsilon:
for maximum energy savings
The theoretical coefficient of
performance of a cooling machine is
calculated with the equation
evaporation temperature T0
ε condensation temperature Tc – evaporation temperature T0
Variable speed control: Extremely economical
operation, lossless / gaining partial load operation,
and especially well-suited for large air conditioning
Magnetic bearing: Hardly any friction losses,
no surface wear and therefore longer service life.
Oil-free operation: Problems due to dirt and
acids are eliminated, cost savings through the
elimination of waste oil and oil management
Measuring and Control System: Efficient
operating checks and monitoring guaranteed
Noise: With only 70 db (A) (speaking volume),
it emits only a fraction of the noise of a screw
compressor with hardly any vibration.
Dimension and weight: Base area reduced
by 50%, operating weight only 120 kg compared
with more than 1,000 kg of screw compressors.
R134a: Completely optimized for the refrigerant
R134a safe for long-term use.
Eco-efficiency: Energy savings reduce greenhouse
gas emissions, oil-free operation offers
additional environmental benefits.
Starting current: Compressor starts with
only 2 A.
The equation indicates that the
condensation temperature must be
kept as low as possible to optimally
raise the efficiency of the cooling
Faced with this basic fact, Reisner
AG developed the unique concept
of variable condensation, the Reisner
Vario technology, as early as 2005.
Compared with conventional
systems, Reisner Vario systems
are able to significantly lower the
condensation temperatures analog
to the here common, lower outside
temperatures, which by itself yields
an electrical energy savings of up
to 40%. The Epsilon compressor
exhausts the possibilities of this
technology to the fullest extent by
enabling condensation temperatures
of up to 20 °C. The result is that
energy consumption and operating
costs drop drastically once more.
Epsilon Compressor Advantages Reisner Epsilon System Benefits
Vario combination: Epsilon systems achieve
especially low condensation temperatures and exhaust
the advantages of the tried and tested Reisner Vario
technology to the fullest extent possible.
Combination with new types of evaporator
s ys tem s : A new type of evaporator can be used in
Epsilon systems due to the oil-free operation. Higher
evaporation temperatures significantly increase the
coefficient of performance. Since the evaporator
is quickly cleaned, the entire Epsilon system is also
extremely easy to maintain.
Reisner control combination: Reisner AG uses a
sophisticated switching cabinet and control concept
based on the Vario technology for its Epsilon systems.
The touchpanel depicts all parameters of the Siemens/
Reisner PLC for a quick and reliable efficiency
assessment at a glance.
Large heat exchanger combination: All cooling
surfaces of evaporators and condensers are
specifically designed to meet the demands of new
climate conditions. This is a special feature of Reisner
Epsilon systems. The improved heat exchange benefits
the system efficiency tremendously.
Reisner design combination: As with all Reisner
systems and machines, the Epsilon systems are also
characterized by clever design features allowing
easy access to all components and modules for
Practical and economical:
with new evaporator
Reisner AG also combines the
Epsilon displacement compressor
with a completely new type of
evaporator that can only be used in
Top in partial load operation
By integrating the stepless control of the Epsilon
compressor into the Reisner control it is possible to
adapt the machine performance exactly to the actual
cooling requirement of the operator. This is especially
advantageous if the demand frequently fluctuates.
These load fluctuations are very pronounced when air
conditioning buildings: Only rarely must the cooling
system run at full load in these cases. While traditional
comparisons of the performance coefficient are based
on full-load operation, the ESEER (European Seasonal
Energy Efficiency Ratio) specifically addresses the
partial load operation of the cooling system.
Operating voltage: 400 V/50 Hz · Max. operating current: 145 A
oil-free systems. The refrigerant does
not circulate – as it is usually the case
– through the pipe bundles of the
evaporator. Instead, it evaporates
inside the jacket tube. Cooling water
flows through the bundle tube pipes
instead. This results in a significantly
more efficient heat exchange and
higher evaporation temperatures,
which, as evidenced by the
coefficient of performance equation,
increases the system efficiency as
well as lowers the condensation
temperatures. Its ease of
maintenance is another advantage of
this type of evaporator. The bundle
tubes are easily accessed
and can be cleaned quite
nicely on the inside using
a boiler pipe brush – for
optimal heat transfer and
long-term reliable system
εRefrigerant in jacket,
water in the bundle tubes:
Reisner Epsilon systems can
be equipped with evaporators
offering significant advantages.
The fact that the system primarily delivers only
between 25% and 75% of the rated output is taken
into consideration here. To determine the ESEER value,
the performance coefficients for operating at full load
(EERA), at 75% (EERB), 50% (EERC), and 25% (EERD)
of the rated output are logged and weighted based on
their distribution across annual operating hours.
The ESEER values of Epsilon systems are indeed
impressive. Specifically when it comes to partial loads
of 50%, which at 41% are weighted most heavily in the
ESEER distribution, a Reisner sample system convinces
with a COP value of more than 9.87 compared with
5.10 at full load. The total value is affected positively
according to the weighting and amounts to 8.47.
COP value Analysis Factor
kW On °C Off °C On °C kW A W/W for ESEER
300 (100 %) 15,2 12,0 30,0 58,8 92,2 5,10 EERA 3%
225 (75 %) 14,4 12,0 26,0 32,3 48,4 6,97 EERB 33 %
150 (50 %) 13,6 12,0 22,0 16,4 22,6 9,15 EERC 41 %
75 (25 %) 12,8 12,0 18,0 7,6 10,8 9,87 EERD 23 %
8,47 ESEER 100 %
Water volume flow
Evaporator: 80 m³/h · Condenser: 65 m³/h
with Klaus Reisner
spoke to the founder
and chairman of
Reisner AG, Dipl.-
Ing. Klaus Reisner,
about the new Epsilon systems, the
COPs, and his clear statements on
Mr. Reisner, you are now
launching the first Reisner systems
on the market with great success.
These new systems implement the
Epsilon compressor also known as
Turbocor compressor. It was only in
2006 when you displayed a critical
view concerning this technology …
No, it was not the technology
I criticized. However, we found out
in 2006 that this kind of compressor
was more and more presented as
a guarantee for top performance
figures without taking into account
the necessary additional equipment.
Besides, the COP terminology was
in part used and applied completely
incorrectly. This has basically eroded
the informational content of this
otherwise valuable parameter.
Properly used, the technology
offers great benefits from which our
customers profit sustainably.
How do you make sure this is
really the case?
We allowed ourselves sufficient
time. Over the past three years,
we subjected Epsilon systems to an
intensive testing and trial operation
itself as well
as the other
conditions. We simu lated all
kinds of possible operating situations
This allowed us to collect
valuable experience-based values
and precise data. We also cooperate
closely with the compressor
manufacturer Danfoss Turbocor Inc.
in the U.S. Some of our staff has
completed intensive training there.
Now is the time for the great market
launch of our Epsilon technology.
Customers can be sure that the
systems we plan together with
them meet and often exceed their
Which customers would benefit
most from the Epsilon technology?
Actually, we have the right
Epsilon solution for every operator.
Use in medium and larger
performance ranges seems to be the
most beneficial, especially where
performance demands are subject
to frequent fluctuations.
Advantages are here the result
of the precisely customized design.
To what extent are your own
developments integrated into the
Our experiences with variable
condensation, which we developed,
has been excellent for many years.
Compact and powerful – thanks to a sophisticated
control and regulating concept, the Epsilon technology
fully develops its strength in this system.
Our vario systems are able to
work with lower c ondensation
temperatures than the usual 49 °C
based on an outside temperature
of 32 °C. We perfected this principle
even further with the help of
the Epsilon compressor. It makes it
possible to lower the emperature
down to 25 °C. The lower the con -
densation temperature, the higher
the coefficientof performance. Clear
and unambiguous evidence of the
outstanding efficiency of Vario
The “coefficient of
performance“ topic seems
of special concern to you.
Have you now found a patent
remedy for performance values?
We are careful when it comes
to patent remedies. But we are
also always completely convinced
of any technology we praise and
defend. Of course, this never
means that we consider development
of this technology impossible.
We do research and continue to
make improvements. By now, we
have implemented large reference
projects that help us with carrying
out long-term studies
Thank you, Mr. Reisner,
for your time.
half the power
at Evonik Röhm GmbH
reliability is crucial when
are connected to one
refrigeration network. Reisner AG
commissioned by Evonik Röhm
GmbH, Darmstadt, has proven
that a high cooling demand is not
necessarily associated with high
investment and operating costs.
Chemical and plastic products
are produced under the roof of
Evonik Röhm GmbH at the Darmstadt
location. The energy plants of
Evonik Röhm GmbH are responsible
for ensuring that the complex
has sufficient steam, compressed
air, cooling water, and brine at
its disposal. For example, three
operations are supplied via one brine
circuit. To supply the cooling brine,
the energy plants used a system with
reciprocating piston compressors
until the end of 2008. When a
compressor finally failed, it was time
for a new solution. Project manager
Irene Faber remembers: “Reisner
AG convinced us with an energy-
saving concept and their competent
High demands, reliable solution
The requirements were
demanding. Approx. 20 m³ of
brine were to be cooled to the low
temperature of –5 °C.
project manager at Evonik Röhm GmbH, in front of
the switching cabinet of the Reisner Epsilon system
was 300 kW
– enough to
reserve of 50%.
The decision in favor of Epsilon
was finally made because operating
costs could be kept so much lower
than with other systems.
The favorable values for partial
load operation played a major role
with this project since the system
is hardly ever run at full load. In the
end, the project partner selected
a combination of three Epsilon
compressors, each with an output
of 150 kW. Two compressors always
deliver the required performance,
one compressor is the backup for
Container as machine room
The entire refrigeration machine
is housed in one single container
located between the production
buildings. The machine room
was subsequently used for other
purposes. As demanded by current
accident prevention rules and
regulations, the Reisner container is
equipped with a gas detection and
warning system and a linked forced
air ventilation system. The low-noise
Epsilon system cannot be heard outside
of the optimally sound- insulated
container. This was a completely
new experience for Irene Faber. “It is
now possible to hold a conversation
while the system is running, even inside
of the container.“
The comprehensive project was
completed with a lead time of four
months. All Evonik Röhm GmbH had
to do after the container arrived was
to install and connect the cooling
water and electrical lines.
Irene Faber reports: “As soon as
the container was in place, we just
made the final connections.“ The
The Reisner Epsilon system at its location
between the Evonik production buildings.
On the left: production connections
timing was perfect. Final program
adjustments were made while the
system was running, which was not
a problem due to the detailed and
thorough preparations. The system
is now a reliable part of the Evonik
Röhm energy supply.
Irene Faber concludes:
“We are very pleased so far with
the operation – especially with the
This special edition
only provides you
with an overview over
what the Epsilon technology
of Reisner AG
comprises and what
your benefits for using
such a system would be. The primary
advantage for you is that each
Reisner system is a one- of-a-kind
consulting free to your
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The coefficient of performance –
Advertising hype or quality seal?
Technical article concerning the optimization
of the coefficient of performance
the opportunity to experience
this new development in person
and discuss with you how Epsilon
can optimize your operating
Do you have questions?
Would you like to know more?
Your contact is
Mr. Joachim Himler,
+49 (0) 23 01/9 10 13-38 and
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energy optimization consulting
concerning your process cooling
Do you need assistance with the
actual cooling system planning?
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