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

APPLICATION

Güntner Gruppe

Finned heat exchangers – Maximum quality and reliability – Corrosion protection thanks to a cathodic dip coating – Low maintenance

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

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.

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

dry

Technologies

sprayed adiabatic hybrid Multiple circuit coil

Finned heat exchangers – Maximum operational reliability – Proven technology – Smooth fins for effective cleaning – Guaranteed capacity thanks to Eurovent certification

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

Plate heat exchangers – Wide capacity range – Small footprint – Adjusted pressure drops

Application – Multiple circuit coil with primary and secondary circuit

– No pipes carrying glycol within the building

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

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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 re-frigerating machine can be switched off com-pletely. This means: – Reduced energy costs – Longer refrigerating machine service life – Less maintenance

Series connection

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 ambi-ent temperature (e.g. 6 °C), the fluid cooler takes over 100 % of cooling and the refri- gerating machine is switched off.

For maximum energy savings Maximum use of free cooling

Parallel connection

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.

Refrigerating machine

Güntner GFD fluid cooler with HydroSpray

Plate heat exchangersthermowave

Servers

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Water

14 °C

22 °C22 °C

16 °C16 °C

20 °C

Fluid cooler

Chiller

Plate

Water/glycol

Water

Fluid cooler

PlateChiller

 Diagram showing the principle behind series connection  Diagram showing the principle behind parallel connection

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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

Figure 1The 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 ma-chine 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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Temperature [°C]

Absolute frequency distributionAnnual temperature curve (Frankfurt a. M.)

100 % free cooling

Start: free cooling

Free cooling Refrigerating machine

Figure 2The 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.

Proportion of free cooling

Hours per year [h]

Tem

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ture

[°C]

Chiller

RM + fluid cooler≈ 4400 h/a

Fluid cooler≈ 2700 h/a

Cumulated frequency distributionAnnual temperature curve (Frankfurt a. M.)

100 % free cooling

Start: free cooling

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 coolerProfessional Dry

Approx. 50% energy savings for server cooling

Typical area of application: 50 – 1,000 kW

High operational reliability

Proven technology

Maintenance-free

No water consumption

No water treatment

No 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)

Minimal energy consumption at reduced load

– Night setback for low noise emissions – Tear-off function in the event of frost/snow

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

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

Transportation/bringing-in

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

Unit designs

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

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HydroSpray sprayed fluid cooler

Approx. 60 % of energy saved thanks to free cooling and spraying

Typical application: 100 – 1,500 kW

Greater potential for saving energy thanks to the use of spraying

Absolute operational reliability even at unexpectedly high ambient temperatures

No recirculation system

No risk of legionella

GHM Spray Professional – Intelligent control system reduces operating costs

– Integrated Güntner Hydro Management Water spraying in up to 9 levels (SectionCycling)

– Completely factory-wired

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

– Factory wired – Low noise level – ErP-ready

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

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

Up to 80 h/a: No treatment Up to 500 h/a: Softening 500 – 1,000 h/a: Softening + desalination

Mode of operation: At low ambient temperatures: dry operation

At high ambient temperatures: sprayed operation

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

Separate primary and secondary circuit

No glycol-carrying pipes in the building or the server room

Small footprint

High-quality materials

Can be dismantled for cleaning

Further 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

Primary circuit (water/glycol)Secondary circuit (water)

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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.

Colocall Internet Data CenterThe 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.

References

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.

Data centre of an insurance company in CologneThe 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.

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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 in-stalled 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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Nowadays Data CenterThe 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 am-bient temperatures and as part of a water-cooled cooling system at higher ambient temperatures.

Moscow II Data CenterThe 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 accommo-date 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 con-densers in order to ensure redundant operation.

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.

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 demand-ed 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 ambi-ent 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 air-cooled 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.

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Güntner GmbH & Co. KGHans-Güntner-Str. 2 – 682256 FürstenfeldbruckGERMANY

www.guentner.eu

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