APPLICATION

IT Cooling Solutions Güntner Group heat exchangers All fluid cooler technologies from a single source

All fluid cooling technologies for data centres and server rooms For over 80 years, the Güntner Group has been manufacturing heat exchangers for refrigeration and air conditioning. Our reliable and innovative products make us one of the industry’s leading component manufacturers. With our diverse technologies and our consulting expertise we can supply the optimal fluid cooler for every application. For IT cooling applications this means a high level of operational reliability plus a short payback period due to low operating costs.

Technologies dry

sprayed

adiabatic

hybrid

Multiple circuit coil

Güntner Gruppe

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The Güntner Group offers you  Maximum operational reliability  Minimal noise emissions  Maximum energy cost savings

 High-quality components  High levels of consulting expertise  Certificated capacity specifications

Finned heat exchangers

Fans

Plate heat exchangers

Application

–– Maximum operational reliability –– P roven technology –– Smooth fins for effective cleaning –– Guaranteed capacity thanks to Eurovent certification

–– Wide capacity range –– Small footprint –– Adjusted pressure drops

Finned heat exchangers

–– Maximum quality and reliability –– Corrosion protection thanks to a cathodic dip coating –– L ow maintenance

–– E C technology –– Optimised impeller profile –– Low-noise operation –– Speed controller –– Night setback for minimal noise emissions

–– Multiple circuit coil with primary and secondary circuit –– No pipes carrying glycol within the building

Compared to a cooling tower

–– Up to 10 dB quieter –– Year-round plume-free operation –– Approx. 70 – 90 % water savings –– Economic efficiency analysis on request Further information: www.jaeggi-hybrid.eu

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Indirect free cooling A typical application for free cooling is the provision of cold water for cooling data centres and servers. This makes it possible to reduce the operating load hours of the refrigerating machine, so saving a significant proportion of the energy costs. When the ambient temperature is low, the refrigerating machine can be switched off completely. This means: –– Reduced energy costs –– Longer refrigerating machine service life –– L ess maintenance

1 2Refrigerating 3 4 5machine 6 7 8 9 10 1 2 4 7 8 9 10 1 3 2Güntner 3 5 4GFD6 5fluid 6 cooler 7 8 9 10 1 1 1 2 1 1 2

1 2 1 2 3 2 3

2 1 3 2 3 4 3 4

with HydroSpray

3 9 10 2 4 3 5 4 6 5 7 6 8 7 8 9 10 4Plate 5 heat 6 exchangers 7 8 9 10 3thermowave 4 5 6 7 8 9 10 4 5 6 7 8 9 10 5Servers 6 7 8 9 10 4 5 6 7 8 9 10 5 6 7 8 9 10

1 2 3 4 5 6 7 8 9 10

Fluid cooler Chiller

Series connection

16 °C

Water 22 °C

  Diagram showing the principle behind series connection 4

20 °C

Plate

Water/glycol

14 °C

If the ambient temperature is 2 K below the fluid temperature (Ta = 18 °C), the fluid is pre-cooled in the fluid cooler and the refrigerating machine takes over the remaining cooling. From a specific ambient temperature (e.g. 6 °C), the fluid cooler takes over 100 % of cooling and the refrigerating machine is switched off.  For maximum energy savings  Maximum use of free cooling

1 2 3 4 5 6 7 81 92103 4 5 6 7 8 9 1

1 2 3 4 5 6 7 81 92103 4 5 6 7 8 9 1

1 2 3 4 5 6 7 81 92103 4 5 6 7 8 9 1

1 1 2 3 4 5 6 7 8 9 1 1 2 3 4 5 6 7 8 9 1 1 2 3 4 5 6 7 8 9

2 3 4 5 6 7 8 10 2 3 4 5 6 7 8 10 2 3 4 5 6 7 8 10

Fluid cooler

Parallel connection

Water/glycol

Chiller Plate

When the ambient temperature reaches the level where the fluid cooler can take over 100% of cooling, the valves are actuated. The fluid cooler takes over the cooling. The refrigerating machine is switched off.

16 °C

22 °C

Water

  Diagram showing the principle behind parallel connection 5

Approx. 50 % of energy saved thanks to free cooling Free cooling can be used to cover a large proportion of the installation’s annual operating hours. The following example shows the maximum possible savings in energy costs as a result of installing the fluid cooler and the refrigerating machine in series.

Example: –– The fluid cooler and chiller are connected in series. –– Load profile: Year-round cooling required for server cooling –– Cooling water for servers 22/16 °C

Absolute frequency distribution

Annual temperature curve (Frankfurt a. M.) 450 400

100 % free cooling

350

Start: free cooling

300 250 200

Hours per year

150 100

Free cooling

Refrigerating machine

50 0 -20

-15

-10

Temperature [°C]

-5

0

5 6 °C

10

15

20 18 °C

25

Figure 1

30

35

40

The figure shows the annual operating hours of the refrigerating machine and the fluid cooler using a server cooling system in the Frankfurt am Main area as an example. At ambient temperatures ≥ 18 °C, only the refrigerating machine is operating. At ambient temperatures ≤ 6 °C, only the fluid cooler is operating and the refrigerating machine is not required. Between 6 – 18 °C, the fluid cooler takes some of the load off the refrigerating machine and both systems operate in combination. This type of installation leads to a significant reduction in energy costs. * Start of free cooling at ΔT = 4 K between ambient temperature and temperature of water returning from the servers

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Figure 2

The figure shows the annual operating hours of the refrigerating machine and the fluid cooler for the same example using a cumulated frequency distribution of annual temperatures. With this type of graph, the number of operating load hours for the three sections in Figure 1 can be read directly.  At an ambient temperature of 12 °C, 50 % of server cooling is provided via free cooling.  At an ambient temperature of 6 °C, 100 % of server cooling can be provided via free cooling.

Cumulated frequency distribution

Annual temperature curve (Frankfurt a. M.) 40

Proportion of free cooling

Chiller

25 %

30

20

50 %

75 %

18 °C RM + fluid cooler ≈ 4400 h/a

12 °C

10

Start: free cooling

6 °C

Temperature [°C]

100 % free cooling 0 Fluid cooler ≈ 2700 h/a

-10

-20

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

Hours per year [h]

Full load operating hours per year

Ambient temperature

Mode of operation

1,700 h

≥ 18 °C

Refrigerating machine

4,400 h

6 – 18 °C

Fluid cooler + refrigerating machine

2,700 h

≤ 6 °C

Fluid cooler

* Location Frankfurt a. M./Germany, cooling water for servers 22/16 °C

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Dry fluid cooler Professional Dry ffApprox. 50% energy savings for server cooling ffTypical area of application: 50 – 1,000 kW ffHigh operational reliability

Finned heat exchanger

–– Maximum operational reliability and leak containment thanks to proven Güntner floating coil principle –– Smooth fins for effective cleaning –– Excellent fouling resistance –– Guaranteed performance thanks to Eurovent certification –– Large number of different types

ffProven technology ffMaintenance-free ffNo water consumption ffNo water treatment ffNo risk of legionella

"IT Solutions" Güntner fluid coolers –– Ready for connection including control system –– Güntner Motor Management –– Permanent monitoring of all important system parameters –– Emergency operation with 100 % fan speed –– Modbus and Profibus –– LCMM (Low Capacity Motor Management) ff Minimal energy consumption at reduced load –– Night setback for low noise emissions –– Tear-off function in the event of frost/snow

Transportation/bringing-in Wireless Communication Module –– Web browser function –– WiFi/LAN cable/VPN tunnel –– Integration into the company network –– System parameters can be retrieved via web browser

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–– Very stable, torsion-resistant casing –– Low number of crane eyes –– Structural certificate for helicopter transport

EC fans

–– High motor efficiency –– Low operating costs –– Integrated electronics with speed controller –– Outputting of all important operating parameters –– No contactors or overcurrent protection systems to be provided by customer –– Completely wired –– Low noise level –– ErP-ready

Unit designs

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HydroSpray sprayed fluid cooler ffApprox. 60 % of energy saved thanks to free cooling and spraying ffTypical application: 100 – 1,500 kW ffGreater potential for saving energy thanks to the use of spraying

Finned heat exchanger

–– Maximum operational reliability and leak containment thanks to proven Güntner floating coil principle –– Smooth fins for effective cleaning –– Excellent fouling resistance –– Guaranteed performance thanks to Eurovent certification –– Large number of different types

ffAbsolute operational reliability even at unexpectedly high ambient temperatures ffNo recirculation system ffNo risk of legionella

Technical details of the Güntner HydroSpray system Type: Professional –– Maximum water savings thanks to patented Güntner spraying system –– Reduced number of spraying hours –– Large nozzles, low risk of clogging –– No booster pump required –– Automatic draining by injector pump –– Water treatment ff Up to 80 h/a: No treatment ff Up to 500 h/a: Softening ff 500 – 1,000 h/a: Softening + desalination

Mode of operation:

ff At low ambient temperatures: dry operation ff At high ambient temperatures: sprayed operation

GHM Spray Professional –– Intelligent control system reduces operating costs –– Integrated Güntner Hydro Management Water spraying in up to 9 levels (SectionCycling) –– Completely factory-wired 10

EC fans

–– High motor efficiency –– Low operating costs –– Integrated electronics with speed controller –– Output of all important operating parameters –– No contactors or overcurrent protection systems to be provided by customer –– F actory wired –– Low noise level –– ErP-ready

Transportation/bringing-in

–– Very stable, torsion-resistant casing –– Low number of crane eyes –– Structural certificate for helicopter transport

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Plate heat exchangers ffSeparate primary and secondary circuit ffNo glycol-carrying pipes in the building or the server room ffSmall footprint ffHigh-quality materials ffCan be dismantled for cleaning ffFurther units can be added if necessary Plate heat exchangers

–– Minimal temperature differences save energy –– Excellent fouling resistance –– Highly fail-safe thanks to proven technology –– All parts in contact with water are made of stainless steel

Easy to install and service –– Compact construction –– Easy cleaning –– Further units can be added

Wide range of applications –– Capacity of 50 – 5,000 kW –– Various plate geometries –– Optimised pressure drops

Member of the Güntner Group –– Everything from a single source –– Easy processing –– Precise design

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er) uit (wat c ir c y r econda

l) er/glyco t a w ( t i circu Primary

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References

Colocall Internet Data Center

The Colocall Internet Data Center is located in Kiev, Ukraine. The data centre provides server capacity for private and business customers. What makes it so special is the fact that it is housed in a former Soviet nuclear bunker which was converted into server rooms. The data here are protected not only by the building itself but also by the reliable cooling provided by Güntner's heat exchangers. 12 Güntner FLAT Compact GVH condensers, 38 CUBIC Compact GHF air coolers and a V-SHAPE Vario GFD fluid cooler are used in the centre.

Data centre of an insurance company in Cologne

The insurance group in question is one of the biggest in Germany. Six Güntner GFD fluid coolers with the HydroSpray system provide free cooling for the data centre in Cologne. Güntner's patented SectionCycling control system reduces the spraying time, saves water and guarantees that the fluid coolers work at full capacity up to an ambient temperature of 40 °C.

Grass Merkur data centre

Grass Merkur, a service provider in the fields of data centre services, consulting and software, operates a data centre in Hanover which meets the very highest requirements when it comes to security and cost-effectiveness. In order to reduce energy costs, two Güntner GFD systems, each with a cooling capacity of 300 kW were installed. The fluid coolers reduce the burden on the refrigerating machine and, at ambient temperatures below 17 °C, take over the entire cooling of the data centre.

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Telefonica O2

When it comes to cooling its server rooms in the Nagano-Center in Prague, Telefonica O2 relies on Güntner GVHX condensers with particularly quiet, Energy Efficiency Class A EC fans. In two rooms covering a total area of approx. 2,000 m2, 29 DX precision air conditioning systems each with a cooling capacity of 105 kW and another four systems each with a cooling capacity of 50 kW were installed in order to cool the emergency power supply system. All systems have a dual-circuit design. Consequently, a total of 66 condensers – 58 with a condensing capacity of 64 kW and 8 with a condensing capacity of 31 kW

– were installed on the roof. In order to minimise the energy consumption of the cooling systems, they are designed for a temperature difference of approx. 10.5 K (the small units for just 8 K). Telefonica O2 opted for the GVHX units with microox technology not only because of their high level of operational reliability but also because of their significantly lower weight. After all, the microox coils are made exclusively of aluminium. Thanks to the integrated free cooling heat exchanging coils, the old cooling systems are still used to safeguard free cooling operation in winter.

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Güntner server room

The new server room at the Güntner headquarters in Fürstenfeldbruck went into operation in 2011 and features an energy-saving air conditioning system based on the company's own fluid coolers. 120 kW of cooling capacity is required for the final expansion stage. Two Güntner GFW systems each with a cooling capacity of 120 kW were installed to cool the water-cooled refrigerating machines and for operation as fluid coolers. Depending on the ambient temperature and the cooling load, the fluid coolers are switched to free cooling mode one after the other.

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1&1 data centre in Karlsruhe – 100 % operational reliability 1&1 Internet AG, one of the biggest Internet providers in the world, was on the lookout for a system to cool its new data centre in the Baden-Baden area. The centre is to be developed into a central node in international data traffic offering 100 % operational reliability. The new data centre is located in a former army bunker. It offers space for a total of 80,000 Internet computers as well as the necessary discretion.

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The systems for operating the data centre include not only the all-important refrigerating machines but also emergency power supplies and re-cooling units, all of which were to be installed on the roof of the data centre. So also the size of the machines had to be taken into account during the planning stage.

In order to maximise operational reliability, 1&1 demanded three completely independent cold water circuits for the data centre cooling system. In order to make the solution viable from the point of view of CO2, dry ambient air coolers which, via an intermediate glycol circuit, efficiently support the water chillers from temperatures of approx. 10 °C were provided in addition to the aircooled water chillers. Combitherm, the plant contractor

enlisted to install the system, chose three water chillers each with a capacity of 900 kW. Each machine features two screw compressors, two compact stainless steel plate heat exchangers (each with an assigned cold water pump) and a condenser with a particularly high power density which was specially developed by Güntner for this purpose.

Nowadays Data Center

The Nowadays Data Center is located in Sofia, Bulgaria. Server systems are installed across an area of 1,200 m2. During planning, particular attention was paid to energy saving components and redundant systems. Only components from renowned manufacturers were used. The two large FLAT Vario fluid coolers with a capacity of 1,200 kW operate as free cooling units at low ambient temperatures and as part of a water-cooled cooling system at higher ambient temperatures.

Moscow II Data Center

The Moscow II Data Center is located on the site of the Kurchatov Academy. The data centre covers an area of 3,500 m2 and can accommodate up to 900 server cabinets. It meets all the requirements of the TIA-942 standards as regards redundancy and reliability. It uses FLAT Compact GVHX condensers from Güntner with microox technology. Each cooling system has two condensers in order to ensure redundant operation.

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8 Jurong Town Hall Road #23-06 The JTC Summit SINGAPORE 609434 www.guentner.asia

Members of Güntner Group

Subject to technical changes. APO / APPLICATION / IT COOLING SOLUTIONS / EN / SEPT 2015

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