Free Cooling

High Efficiency with Free Cooling

When it comes to reducing energy consumption and costs, Free Cooling offers the largest potential for energy savings – in particular in cold and moderate climate zones. 

Direct Free Cooling

Direct Free Cooling

With Direct Free Cooling, filtered outside air is used to keep the data center cool. This brings huge potential savings of up to 90%. If the outside temperature rises above the supply air set point, either an integrated DX system with compressors or a separate chiller assumes the task of cooling the data center.


Indirect Free Cooling

Indirect Free Cooling

Direct Free Cooling brings challenges as well. With this cooling method, a large volume of outside air enters the rooms, so that extended temperature and humidity tolerances must be permitted. With Indirect Free Cooling, a system with a water/glycol mixture is used to cool the data center. Unlike with Direct Free Cooling, no outside air enters the data center with this cooling method. Air-conditioning systems with Indirect Free Cooling can be configured flexibly to suit requirements and are extremely efficient.

Indirect Dynamic Free Cooling

To further improve the efficiency of Indirect Free Cooling, STULZ has developed a dynamic control system for use with its own units. This system controls the mode in accordance with the current heat load in the data center and so considerably increases the number of operating hours in Free Cooling mode compared with other Indirect Free Cooling systems. Moreover, STULZ Indirect Dynamic Free Cooling has another operating mode – Extended Free Cooling – which further lengthens the time of Free Cooling mode and drastically reduces operating costs. The dynamic control cuts energy-intensive compressor cooling to a minimum.


STULZ units with Direct and Indirect Free Cooling

STULZ units with Direct and Indirect Free Cooling

CyberAir 3 DX

The CyberAir 3 precision air-conditioning system with Indirect Free Cooling and Direct Free Cooling conditions the air in Data Centers and equipment rooms up to 90 % more economically than conventional compressor cooling systems.

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CyberAir 3PRO CW

The CyberAir 3PRO CW units are optimized for energy efficiency, low fan power consumption and "modern" high air and water temperatures. To enable Direct Free Cooling, the CyberAir 3PRO CW units can be equipped with the FreeCool Plenum Free Cooling box. Connected with two chilled water coils, CyberAir 3PRO CW can offer Indirect Dynamic Free Cooling.

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STULZ units with Direct Free Cooling

STULZ units with Direct Free Cooling

MiniSpace EC

MiniSpace EC with Direct Free Cooling option is the ideal solution for high efficient cooling of small server and technology rooms.

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Wall-Air Evolution

Wall-Air-Evolution units are installed outside the container, making the best possible use of the container space. The units boast Free Cooling and Mixed modes - the combination of Free Cooling and compressor cooling, and therefore achieve savings of up to 84 % on operating costs.

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Tel-Air 2

Tel-Air-2 units are designed for installation in Telecommunication containers and equipment rooms but are suitable for every kind of room. The air conditioning units are plug and play and immediately ready for connection and use. All Tel-Air-2 units also feature a Mixed mode that dramatically reduces operating costs.

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Split-Air

Split-Air-3 is the space and energy-saving version for the reliable cooling of telecommunication containers. The unit consists of an evaporator and a condenser unit, and is a plug and play design allowing immediate connection and use. The Split-Air-3 features Free Cooling and Mixed modes, and therefore achieves savings of up to 83 % on operating costs.

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Free-Air

To considerably cut the operating costs of base stations, these can be retrofitted with the Free Cooling unit STULZ Free-Air. Free-Air enables you to transform your existing system into an energy efficient solution at low cost that with Free Cooling achieves savings of up to 96 %.

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STULZ units with Indirect Free Cooling

STULZ units with Indirect Free Cooling

CyberRow

The CyberRow GES system is a hybrid system combining a GS system (Compressor cooling with plate condenser and water glycol mix) with Indirect Free Cooling. That principle by STULZ is unique on the market. Using CyberRow GES will save operating costs as well as the environment.

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CyberCool 2

In temperate climates, the CyberCool 2 runs most of the year in energy-efficient Mixed mode, i.e. a combination of Free Cooling and compressor cooling. That fact and the coils designed with the maximum surface area, make the CyberCool 2 the top of the class in energy.

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CyberCool IndoorChiller

In combination with dry coolers the benefits of Indirect Free Cooling and low outside temperatures can be used. Power intensive compressor cooling will only be applied when the outside temperatures disallow Free Cooling.

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CyberCool 1

Thanks to the availability of CyberCool 1 even in smaller sizes, flexible application of Free Cooling is possible.

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STULZ GmbH
Holsteiner Chaussee 283
22457 Hamburg 

Central Office: +49 40-5585-0
Fax: +49 40-5585-352

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