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STULZ worldwide

The benchmark of Free Cooling chillers

The CyberCool 2 enables you to operate with maximum energy efficiency and optimum reliability for complex, demanding and uncompromising chilled water solutions. At the same time, the completely new overall concept of all components ensures low sound emissions in noise-critical applications. The result is a sustainable range of chillers that meets every eco-design directive.

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Product Overview

At a glance Benefits Features Technical Data

Most important benefits

  • TCO leader: Lowest total cost of ownership through Free Cooling and a unique "Mix Mode Boost”
  • Flexible adaption to every project through 12 sizes, 5 versions, 2 designs and various options
  • Minimum noise emissions with maximum energy efficiency

Most important features

  • Designed especially for mission-critical applications, such as data centers and industry as well as suitable for medical sector
  • Maximum possible efficiency through Indirect Free Cooling
  • Outdoor installation on the roof or next to the building

Most important technical data

  • 191 models in 12 sizes
  • Cooling capacity (kW): 50 – 1,400
  • Refrigerants R410a (GWP: 2.088), R134a (GWP: 1.430), R1234ze (GWP: 7)
  • TCO leader: Lowest total cost of ownership through Free Cooling and a unique "Mix Mode Boost”
  • Maximum size components ensure low energy consumption
  • Maximum possible efficiency through Indirect Free Cooling
  • Flexible adaption to every project through 12 sizes, 5 versions, 2 designs and various options
  • Specially developed for mission-critical applications
  • Ongoing quality management during production
  • Minimum noise emissions with maximum energy efficiency
  • Highest sustainability standards and ErP 2021 compliance
  • Designed especially for mission-critical applications, such as data centers and industry as well as suitable for medical sector
  • Safe operation at outdoor temperatures from -40 to +60 °C
  • Broad operating range with chilled water inlet temperatures up to +33 °C and chilled water outlet temperatures up to +22 °C
  • Available in 28 versions with:
    - Standard, Free Cooling or Non-glycol2
    - Screw or scroll compressor
    - Power- or noise-optimized
    - Refrigerants: R134a (GWP 1430), R513A (GWP 631) und R1234ze (GWP 7)
    - Adiabatic wet-pad system
  • Made and Engineered in Germany
  • Outdoor installation on the roof or next to the building
Cooling capacity (kW) 50 – 1,400
Sizes 12
Dimensions Length (mm): 2,300 – 12,785
Depth (mm): 1,300 – 2,300
Hight (mm): 2,350 – 2,510
Refrigerants

R410a (GWP: 2,088)

R134a (GWP: 1,430)

R1234ze (GWP: 7)

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Low energy consumption

Chiller unit: Maximum size components ensure low energy consumption

The TCO leader

CyberCool 2 units have been specially developed for use in industry and data centers, and satisfy all efficiency and reliability requirements. The perfectly harmonized range of options, the intelligent control concept, and the option of custom-tailored solutions all combine to make the CyberCool 2 a high-end chiller with the lowest overall operating costs whatever the operating conditions.

1. Maximized Free Cooling coils

  • Reduced compressor runtime thanks to early switchover to efficient Mixed and Free Cooling mode
  • Minimized pump energy consumption thanks to low hydraulic pressure drops
  • Designed with copper and aluminum coils

2. Large microchannel condensers

  • Low fan energy consumption due to minimized air resistance
  • Low condensing temperature in DX mode for low energy consumption
  • Improved heat transfer combined with reduced quantities of refrigerant

3. EC fans with reduced speed

  • Lower nominal current and noise emissions, as the fans always run in partial load mode
  • Optimized for continuous operation

4. Evaporators with a large surface area for high evaporation temperatures

  • Low pressure drops and optimized heat transfer ensure especially high evaporation temperatures

Energy efficiency vs. low noise – Your priority in focus

Saving energy at the expense of reliability? Less noise emissions at the expense of energy efficiency? STULZ chilled water solutions make no compromises. With the CyberCool 2, the optimum operating point can be achieved for every project: Depending on priority, energy efficiency, noise emissions or both can be individually optimized. The following examples show the variable range of applications for the CyberCool 2.

 

Priority: Energy efficiency

The fans run at high speed.

  Sound pressure (1 m) EER Cooling capacity Airflow Fan power consumption
  74 dB(A) 3.81 760 kW 308,000 m3/h 1.63 kW

 

 

Priority: Noise emissions

Noise values are reduced to the minimum.

Sound pressure (1 m) EER Cooling capacity Airflow Fan power consumption
66 dB(A) 2.72 625 kW 123,200 m3/h 0.10 kW

Priority: Optimum noise emissions and energy efficiency

Lowest noise emissions with optimum efficiency.

Sound pressure (1 m) EER Cooling capacity Airflow Fan power consumption
70 dB(A) 3,77 735 kW 246,400 m3/h 0.83 kW

Comments:

Technical data of the CyberCool 2 ESO 7402 AHF under the following conditions:

Water 18/12 °C, outside temperature 35 °C, incl. AxiTop Noise level (full load) at a distance of 1 m in free-field conditions (to ISO 3744), 30 % glycol

Noise-optimized version

Chilled water systems by STULZ: Powerful and quiet

Where there are people, noise emissions should always be kept to a minimum. This applies in commercial and industrial zones, and even more so in the vicinity of offices, hospitals and residential areas. The CyberCool 2 is equipped with components that lower noise emissions to a most impressive minimum.
 

Noise-optimized for all applications
There are many projects where the noise emissions of the chilled water systems have to be factored in. For installation near an office building or in a hospital, in particular, low noise values are essential. When designing the CyberCool 2 as a commercial water chiller, STULZ focused on optimizing noise without neglecting energy efficiency.
 

The CyberCool 2 is equipped with high-quality components that greatly minimize the noise level:

  • EC fans with a large surface area (Ø 910 mm) enable operation at reduced speed
  • The airflow properties ensure reduced air turbulence, resulting in low pressure drops and noise emissions
  • Sound-insulated compressor chamber
  • The fan diffuser attachment (optional) optimizes the airflow and therefore cuts electricity consumption by up to 20 % and noise by up to 5 dB(A)

The compressors, fans and pumps are the only noise sources with the CyberCool 2 units. Depending on operating conditions, the noise level of the chiller can be reduced by up to 10 dB. To do this, the maximum fan speed is restricted during operation. Furthermore, cooling capacity that is comparable with the standard version can be attained with the low-noise version due to the matching of condensers and fans.

Low-noise chillers for data centers: Peace and quiet for your cooling needs

For data centers close to residential areas, compliance with noise regulations is extremely important. Air conditioning systems can be problematic in this respect. Chillers with a cooling capacity of 500 kW, in particular, often generate a lot of noise during operation. Here, low-noise solutions from STULZ ensure the necessary noise reduction.

Read more about our low-noise chillers for data centers

Climate. Customized.

From standard units to fully customized solutions

The ability to offer such a wide range to customers is the embodiment of our philosophy, "Climate. Customized.". Size, design, cooling capacity or control: STULZ’s CyberCool 2 can be precisely adapted to your individual requirements. In addition, a variety of options and equipment are available to achieve the optimum result.

Learn more about Climate. Customized.

Options

  • Integrated UPS
  • Compressor soft start
  • VSD pumps
  • Energy meter in the electrical cabinet
  • Corrosion protection
  • Axitop
  • Hinged Fans
  • Weather roof

 

 

The ideal option with automatic transfer switch for your reliability

One of the key requirements for mission-critical and sensitive applications is uninterrupted cooling – in the event of a power outage, for example. To guarantee stable cooling capacity in spite of this, STULZ provides the option of an automatic transfer switch fitted directly in the switch gear cabinet. If the primary power supply fails, this is detected automatically and the system defaults to a second power source within a minimum of 180 ms.

Model overview for your mission-critical applications

CyberCool 2 with screw compressors

 

Sizes

 

8

Cooling capacity (kW)400 – 1,400
DimensionsHeight (mm): 2,510

Width (mm): 2,300

Depth (mm): 5,030 – 12,785

 

CyberCool 2 with scroll compressors

 

Sizes

 

4

Cooling capacity (kW)130 – 600
DimensionsHeight (mm): 2,510

Width (mm): 2,300

Depth (mm): 3,950 – 7,250

 

CyberCool 2 mini with scroll compressors

 

Sizes

 

2

Cooling capacity (kW)50 – 130
DimensionsHeight (mm): 2,350

Width (mm): 1,300

Depth (mm): 2,300 – 4,200

 

Free Cooling – maximum possible efficiency

The Free Cooling of the CyberCool 2 uses the outside temperature, which offers the greatest potential savings of all, especially in cold and temperate climates.

When outside temperatures are low, Free Cooling can completely replace energy-intensive compressor cooling. In temperate climates, the CyberCool 2 runs in energy-efficient Mixed mode for most of the year, i.e. with a mixture of Free Cooling and compressor cooling.
 

CyberCool 2 – Top of the class in energy:

  • Early switchover to Free Cooling
  • Maximum use of Free Cooling coils between compressor mode and Free Cooling
  • Coils designed to allow the maximum surface area

Free Cooling calculator
Calculate the potential of Free Cooling at your location.

Free Cooling

At low outside temperatures, the water is cooled solely with the aid of these temperatures. Energy consumption is reduced to an absolute minimum thanks to the maximized Free Cooling coils and early, infinite switchover points.

No efficiency without "Mix Mode Boost"

In moderate climate zones, chillers with Free Cooling run in Mixed mode most of the year. Therefore, the greatest potential savings, by some margin, can be achieved by optimizing Mixed mode.

In Mixed mode, the outstanding performance values of the CyberCool 2 have maximum impact: it efficiently utilizes the condensation pressure control in Mixed mode to cut the energy consumption of the compressors to a minimum.

Innovation: Unlike conventional water chiller solutions, with "Mix Mode Boost" the CyberCool 2 makes 100 % use of the surfaces of the DX coils without having to regulate the fan speed. This dramatically enhances energy efficiency and slashes operating costs.

Adiabatic system for even more Free Cooling

Benefit from the effect of adiabatic evaporative cooling. The adiabatic system with wet pads extracts heat from the outside air and increases the cooling effect. This enables the chilled water circuit to be cooled much longer via the outside air, which significantly extends the Mixed and Free Cooling mode. The result is minimum compressor running time and a reduced condensation temperature – and therefore a minimization of the operating costs.

Benefits of the adiabatic system:

  • Saturation efficiency 89 %
  • Highly efficient distribution system
  • Reuse of water
  • No water droplet entrainment (aerosol)

Non-glycol version: Free Cooling without glycol

There are some buildings where glycol cannot be used. Therefore, with the "Non-glycol2 option" glycol is now only used in the Free Cooling circuit. This option provides the benefits of Free Cooling while refraining from the use of glycol in the building.

However, by separating the Free Cooling and chilled water circuits with an additional brazed plate heat exchanger, the switchover points to Free Cooling and Mixed mode do shift by a few degrees Celsius. To be energy-efficient, the chiller must run in Mixed and Free Cooling mode as early as possible.

 

This unique STULZ solution keeps efficiency losses to a minimum:

  • Brazed plate heat exchanger with minimized pressure drops
  • This permits the use of a "small" Free Cooling pump with low energy consumption (must run continuously in Mixed and Free Cooling mode)
  • High quality, meticulously selected components

Believing is one thing – knowing is another: On the debate around glycol-free CW systems with integrated Free Cooling

When it comes to CW systems for data center cooling, many air conditioning specialists believe that it makes operational and economic sense to do away with water-glycol refrigerant in the data center interior. But more detailed analysis suggests that this theory is the exception, not the rule.

Read more about glycol-free CW systems with integrated Free Cooling

Sustainable low-GWP version with R1234ze refrigerant

Units of the CyberCool 2 ze series are equipped with the refrigerant R1234ze. Due to its low global warming potential (GWP: 7), the refrigerant is particularly sustainable and classified according to the A2L class of hazardous substances. The refrigerant thus has low toxicity and low burning rate. In order to relieve operators of the underlying requirements (standard EN 378), the units are equipped with a special safety concept.

Service and maintenance

As a company with locations across the globe, we offer everything you need in the extremely dynamic world of information technology – plus professional advice in the right place at the right time.

Our trained and experienced sales and service partners are located in over 140 countries. The resulting proximity to our customers allows fast response times. In addition, regular training courses and an active exchange of information ensure high quality and an extensive knowledge of all our products. This way, you can be sure your products are in the best hands and get the right maintenance – all over the world.

Locations worldwide

 

 

Projects

The STULZ Chiller Superlative

For a data center in the Frankfurt area, a long-term partner of STULZ needed a "Climate. Customized." solution for its data center. Two chillers were commissioned which can be integrated into an existing system concept, but which must meet the strictest requirements for noise emissions and electrical switchgear.

 

3U TELECOM counts on chilled water system from STULZ

During the modernization of the air conditioning system in its data center in Hanover, 3U TELECOM GmbH chose to install equipment from STULZ. A liquid cooled system with CyberCool 2 chillers and CyberAir 3PRO CW air conditioning cabinets was installed. Thanks to its Free Cooling and Mixed mode option, the system keeps compressor running times to a minimum and therefore offers an optimum-efficiency solution for data center air conditioning.

Read more about the project 3U TELECOM

Efficient chilled water generation for envia TEL

The new high-performance Data Center of telecommunications provider envia TEL in Taucha near Leipzig was officially opened on May 21, 2014. Over an area of approximately 1,000 m², it provides space for around 300 server cabinets belonging to companies, public institutions and local government units. Two STULZ CyberCool 2 chillers operated in parallel, with Free Cooling coils and flexible Mixed mode, ensure reliable and especially efficient air conditioning. 

Read more about the envia TEL project

Cooling system for Rotkäppchen-Mumm

For its production of alcohol-free alternatives, Rotkäppchen-Mumm was on the lookout for a cooling system for its vacuum dealcoholization plant in Eltville am Rhein, Germany. The main challenge here was minimizing the noise of the running system in the interest of nearby residents, and coping with throughput variations inherent in the production. A successful solution was finally found by the supplier and production team working closely together.

Read more about the Rotkäppchen-Mumm project

Test Center

In our state-of-the-art, 700-square-meter Test Center with its various climate chambers, we can perform a variety of tests on precision air conditioning units and chillers. During the development of the CyberCool 2, we were able to test and optimize it under all climatic conditions encountered around the world. In addition, we offer you the opportunity to book a witness test in our Test Center. This allows you to have the desired air conditioning system tested according to your exact specifications, creating transparency and providing you with information about your system’s performance and energy consumption.

Read more about our Test Centers

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Andorra United Arab Emirates Afghanistan Antigua and Barbuda Anguilla Albania Armenia Angola Antarctica Argentina American Samoa Austria Australia Aruba Azerbaijan Bosnia and Herzegovina Barbados Bangladesh Belgium Burkina Faso Bulgaria Bahrain Burundi Benin Bermuda Brunei Bolivia Brazil The Bahamas Bhutan Bouvet Island Botswana Belarus Belize Canada Cocos (Keeling) Islands Congo Central African Republic Congo-Brazzaville Switzerland Côte d’Ivoire Cook Islands Chile Cameroon China Colombia Costa Rica Cuba Cape Verde Christmas Island Cyprus Czech Republic Germany Djibouti Denmark Dominica Dominican Republic Algeria Ecuador Estonia Egypt Western Sahara Eritrea Spain Ethiopia Finland Fiji Falkland Islands Micronesia Faroes France Gabon United Kingdom Grenada Georgia French Guiana Ghana Gibraltar Greenland Gambia Guinea Guadeloupe Equatorial Guinea Greece South Georgia and the South Sandwich Islands Guatemala Guam Guinea-Bissau Guyana Hong Kong SAR of China Honduras Croatia Haiti Hungary Indonesia Ireland Israel India British Indian Ocean Territory Iraq Iran Iceland Italy Jamaica Jordan Japan Kenya Kyrgyzstan Cambodia Kiribati Comoros Saint Kitts and Nevis North Korea South Korea Kuwait Cayman Islands Kazakhstan Laos Lebanon Saint Lucia Liechtenstein Sri Lanka Liberia Lesotho Lithuania Luxembourg Latvia Libya Morocco Monaco Moldova Madagascar Marshall Islands North Macedonia Mali Myanmar Mongolia Macao SAR of China Northern Marianas Martinique Mauritania Montserrat Malta Mauritius Maldives Malawi Mexico Malaysia Mozambique Namibia New Caledonia Niger Norfolk Island Nigeria Nicaragua Netherlands Norway Nepal Nauru Niue New Zealand Oman Panama Peru French Polynesia Papua New Guinea Philippines Pakistan Poland Saint Pierre and Miquelon Pitcairn Islands Puerto Rico Portugal Palau Paraguay Qatar Reunion Romania Russia Rwanda Saudi Arabia Solomon Islands Seychelles Sudan Sweden Singapore Saint Helena, Ascension and Tristan da Cunha Slovenia Svalbard Slovakia Sierra Leone San Marino Senegal Somalia Suriname São Tomé e Príncipe El Salvador Syria Eswatini Turks and Caicos Islands Chad French Southern Territories Togo Thailand Tajikistan Tokelau Turkmenistan Tunisia Tonga Timor-Leste Turkey Trinidad and Tobago Tuvalu Taiwan Tanzania Ukraine Uganda United States Minor Outlying Islands United States Uruguay Uzbekistan Vatican City Saint Vincent and the Grenadines Venezuela British Virgin Islands US Virgin Islands Vietnam Vanuatu Wallis and Futuna Samoa Yemen Mayotte South Africa Zambia Zimbabwe Palestine Åland Heard Island and McDonald Islands Montenegro Serbia Jersey Guernsey Isle of Man Saint Martin Saint Barthélemy Bonaire, Sint Eustatius and Saba Curaçao Sint Maarten South Sudan Kosovo
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