This document discusses cooling solutions and services for data centers provided by STULZ. It describes indirect and direct free cooling systems, how they work, and their advantages. It provides examples of total cost of ownership calculations showing significant savings from using free cooling systems compared to traditional air cooled or chilled water systems. The document also discusses new concepts for direct free cooling units from STULZ with higher energy efficiency. STULZ is presented as a partner that can provide cooling solutions worldwide and has production sites in several countries.

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Mission Energy:
Energy Efficient Cooling
Developing CAPEX efficient free
cooling strategies and evaluating their
impact on OPEX and TCO

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The tasks of cooling a data centre
What is a direct and an indirect free cooling system?
TCO calculations for your investment in the future
The air conditioning systems of the future
STULZ – your partner for coolnig solutions
The new dimension of free cooling !

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The tasks of cooling a data centre
The new dimension of free cooling !

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Goals today: Cold aisle – hot aisle concept, but…
 seperate the cold and the hot air

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…„straight rows of racks are mixing with „other“ IT equipment

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The target of the air conditioning: cold air in front of the 19” level
 and a clear horizontal air path through the rack
Source: INTEL Source: HP

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Energy flow through the Data Centre
Power Usage Efficiency Finally all leaves as Waste Heat
Source: The Green Grid

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FREE COOLING Room conditions
Ambient air
Raised floor height
Water temperatures
Part load behaviour
Coil dimensioning
Filter surface
Fan technology
Unit sizing
Refrigerant
Pipework dimensions
Pump technology
Unit options
parameters
Filter condition
Amount of refrigerant
Air path
Some criteria that have an influence on the energy efficiancy of your data centre
Stand-by concept
setpoints
Sensor adjustment

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What is a direct and an indirect free cooling system?
The new dimension of free cooling !

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…free cooling is not a new technology
- at least not in this region!
Indirect free cooling
indirect: water/glycol will be
used as a medium between
the inside and outside
Direct free cooling
direcf: a huge part of the
ambient air will be delivered
inside the data centre
Cooling the room without compressor operation: FREE COOLING
Free cooling for
IT-rooms

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Indirect free cooling
indirect: water/glycol will be
used as a medium between
the inside and outside
Direct free cooling
direcf: a huge part of the
ambient air will be delivered
inside the data centre
Cooling the room without compressor operation: FREE COOLING
Free cooling for
IT-rooms
⇒ pedal conneted to the back wheel with a
chain will be used for the transmission of force ⇒ pedal directly
at the wheel

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Function of the indirect free cooling system

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Indirect free cooling
CRAC units with integrated free cooling function
Room air will be seperated from the ambient air by a water/glycol system

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Indirect free cooling
chillers with integrsted free cooling function
Room air will be seperated from the ambient air by a water/glycol system

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TCO calculations for your investment in the future
The new dimension of free cooling !

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System without freecooling vs. System with free cooling
TCO calculation for future investments

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CAPEX
+32%
OPEX
-56%
PER
YEAR
Example1: Traditional Air cooled vs. Stulz DFC

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Example1: Traditional Air-cooled vs. Stulz DFC
€ 220.000.-
Cost
reduction

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Example1: Traditional Air-cooled vs. Stulz DFC

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Example 2: Chilled Water vs. DFC (300kW)
CAPEX:
+70%
OPEX:
-60%
10 year
Savings=
€570.000

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Example 2 : Chilled Water vs. DFC (300kW)

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Energy use
DX
Compressor
operation
FC
Freecooling
EFC
Extended
Freecooling
MIX
Compressorand
Freecooling
Indoor
Outdoor
Control
data
Dynamic Free Cooling,
Control of all components
In the system to assure
The minimum power
consumption
Further potential of saving energy with an indirect free cooling system
 variable control of all components
 Stand-by management
 Maximum energy eficiancy
 approx. 30% energy saving against
Other free cooling systems

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The air conditioning systems of the future
The new dimension of free cooling !

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NEW CONCEPTS: STULZ Direct Free Coolung!
ASHRAE TC 9.9 - 2004
ASHRAE TC 9.9 - 2008
Different requirements allow f
or new concepts!
or
Tight tolerances will still require
Indirect free cooling systems!

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NEW CONCEPTS: STULZ Direct Free Cooling!
Berlin
Bremerhaven
Essen
Frankfurt
Hamburg
Mannheim
München
Nürnberg
Stuttgart
% Anteil 87,6 94,1 91,2 86,8 92,6 85,7 90,0 88,9 90,7
Stunden 7.672 8.239 7.992 7.601 8.111 7.508 7.883 7.787 7.942
Stunden = Jahrestemperaturstunden bis einschließlich 18°C
WETTERDATEN
Mittlere jährliche Stundenanzahl, gemäß DIN 4710 Januar 2003
% Anteil = Prozentualer Anteil der Jahrestemperaturstunden bis einschließlich 18°C
In Germany for example more the 85% of the time the temperatures are ≤ 18°C
Here the results will be even BETTER!!!!

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NEW CONCEPTS: STULZ Direct Free Cooling with optimised coil
placement

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NEW CONCEPTS: STULZ Direct Free Cooling!
Advantages:
 High energy efficiancy by using direct free cooling technology –
no losses by additional heat exchangers
 High scalibility of the system „Build as you grow!“ –
no hydraulics (pipework, pumps, valves) at day 1 needed for the final stage
 Lower CAPEX compared with indirect free cooling systems
 Lower OPEX (energy consumption) the on all other systems

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NEW CONCEPTS: STULZ Direct Free Cooling!
Conditions:
 Accepted room humidity level at approx. 20%- 80% r.H.
 Ambient conditions need to be observed (dust) while selecting the site
(not close to highways, harvest or in the city centres)
 Acceptance of possible ourside influences
(e. g. smoke, gas, etc.)
 Compromising the building safety
Structural conditions:
 Free in the construction of the building
 short distances of the air intake and extract (pressure losses)
 Air intake on the shadow side of the building

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STULZ – your partner for coolnig solutions
The new dimension of free cooling !

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STULZ International Production Sites
STULZ
Air Technology Systems,
Frederick/MD, USA
STULZ S.p.A.
Valeggio sul Mincio(VR),
Italy
STULZ GmbH
Hamburg, Germany
STULZ
Air Technology Systems
(Shanghai), China
STULZ CHSPL (India)
Pvt. Ltd., India

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Find STULZ ...
Italy
Germany
China
USA
Headquarter
… and its qualified and professional partners –
worldwide.
Production Sites
India
Germany

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STULZ Group of Companies
A/C Technology Plastics Technology
Plastics Technology € ≥ 400 Mio
A/C Technology € ≥ 300 Mio
Total € ≥ 700 Mio
Employees
Plastics Technology ≥ 2.400
A/C Technology ≥ 1.600
Total ≥ 4.000
Manufacturer and Distributor of Air
Conditioning Products, Systems
Engineering, Service and Object
Management.
STULZ GmbH, Germany (P)
STULZ Pty Ltd., Australia
STULZ-ATS (Shanghai), China (P)
STULZ France S.A.R.L., France
STULZ UK Ltd., Great Britain
STULZ CHSPL Pvt. Ltd., India (P)
STULZ SpA, Italy (P)
STULZ Groep B.V., Netherlands
STULZ Ltd., New Zealand
STULZ Polska Sp. z o.o., Poland
STULZ España S.A., Spain
STULZ-ATS Inc., USA (P)
Stulz South Africa Pty. Ltd.
(P): Production Site
Development and Production of
Technical Plastic Components for
automotive industry.
Montaplast GmbH, Germany
Montaplast of North America, Inc.,
USA
Montaplast (SIP) Co.,Ltd., China

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STULZ PRODUCTS – Reliable just everywhere
Precision air conditioning for small telecom and IT applications Rechenzentrum
Chillers for precision air conditioning units and water-cooled racks
Chillers from 5kW – 1,5MW
Precision A/C units from 4kW – 200kW
Telecom air conditioners from 200W– 20kW

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STULZ PRODUCTS – innovative and efficiant !
 Introduction of the energy efficiant EC fan technology as STANDARD for all CyberAir
units already in 2004 – today as option seen on nearly all other manufacturers
 STULZ System Cost Calculation tool is delivering world-wide TCO calculations for
operators all around the world since 2006
 STULZ Stand-by Management as an integrated control function on all CW- units was
introduced 2006 to save energy
 Improvement of the indirect free cooling system by Stulz with the introduction of
the Dynamic Free Cooling in May 2007
 Optimisation / extension of the chilled water range in November 2008 CyberAir CW
und CWE – Target: Max. energy efficiancy
 New STULZ concepts for direct free cooling

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Stulz GmbH
Thomas Steinberg
Holsteiner Chaussee 283
22457 Hamburg, Germany
Thank you..
Ph: +49 – 40 – 5585 526
Email: steinberg@stulz.de Web: www.stulz.com