CyberRack Active Rear Door

Optimum operating conditions
via ac server rack

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Efficient and targeted rack cooling

The CyberRack Active Rear Door is a heat exchanger door with EC fans for installing on the rear door of server racks. The server rack door is swapped for the CyberRack Active Rear Door, which transforms the rack into an ac server rack that no longer discharges any heat load in the data center.

Data Center

Our units are designed for highest requirements and maximum reliability

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Small, medium & large rooms

Precision air conditioning units for low to high heat loads

Heat-neutral component

Rack-based cooling without emitting heat into the room

Heat exchanger door

Air conditioning unit for installation on the rear door of server racks

Product Overview

At a glance

Most important benefits

Suitable for any rack
The active heat exchanger doors can be used independently of existing precision air conditioning units, or can supplement them.
Maximum energy efficiency thanks to high rack inlet temperatures

Most important features

Less load on the room air conditioning, because the heat is discharged directly from the rack
Maintenance-friendly design

Most important technical data

Cooling capacity (kW): 19.1 – 32.7

Benefits

Suitable for any rack
The active heat exchanger doors can be used independently of existing precision air conditioning units, or can supplement them.
For air conditioned server racks in data centers with and without raised floor
Maximum energy efficiency thanks to high rack inlet temperatures
Via the ac unit, the server rack becomes heat-neutral, as no warm return air is emitted

Features

Return and supply air sensors ensure uniform temperature distribution under varying server load
EC fans for low electricity consumption
Targeted cooling of high-density racks
Less load on the room air conditioning, because the heat is discharged directly from the rack
For data centers with and without raised floor
Maintenance-friendly design

Technical Data

Cooling capacity (kW)	19.1 – 32.7
Airflow (m³/h)	4,800 – 6,000
Number of fans	4 – 5
Dimensions HxWxD (mm)	2,000 x 600 x 330
Cooling Systems	Chilled water (CW/CW2)

All details about CyberRack

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 or control: CyberRack Active Rear Door is a model of adaptability and can be precisely adapted to your individual requirements. In addition, a variety of options and equipment versions are available to achieve the optimum result.

Learn more about Climate. Customized.

Applications for ac server rack

Application 1: Autonomous CW cooling

Delivers all the cooling capacity the rack requires, with no need for additional precision air conditioning systems
Reliable cooling even without a raised floor
Server rack fan produces no warm return air in the IT room

Application 2: Supplementing the precision air conditioning

Pinpoint cooling of high-density racks
Prevents hot spots
Takes the strain off existing precision air conditioning units
No warm return air discharged into the IT room

Application 3: Increasing capacity

When your IT infrastructure grows, servers can be added as heat-neutral components
No need to purchase further precision air conditioning units
No additional warm return air in the IT room

Air conditioned server racks: Benefits

Flexibility

For cooling entire IT rooms and data centers without additional precision air conditioning units
Also suitable for supplementing existing precision air conditioning units
For rack-based servers both with and without integrated fans
Space-saving installation as a rack door with no structural changes to the data center
For data centers with and without raised floor
No need to separate hot and cold aisles
Individual adapter frames make them suitable for any rack

Efficiency

Maximum energy efficiency when ac server racks are combined with chillers with Free Cooling function: as the servers are cooled directly in the server rack, high water temperatures are possible, considerably increasing the number of operating hours with Free Cooling
EC fans for maximum energy efficiency
The server rack becomes heat-neutral, as no warm return air is emitted
Sensors for measuring return air and supply air temperatures: precisely air-conditioned server racks even with fluctuating server loads

Operational reliability

Redundant power supply for maintaining the air supply if mains electricity fails
To protect the server's own fans from excess pressure, the optional differential pressure con-trol from STULZ adapts the speed of the CyberRack fans in line with the server airflow
If an EC fan drops out, the speed of the remaining fans increases
The EC fans can be replaced during operation if necessary
SEC.blue for controlling and monitoring the air conditioning system
Maintenance-friendly design

Design and sizes

Compact design

Less than 300 mm additional rack depth
No need to reposition the server racks
The servers can retain all the height units in the rack

Individual adapter frames make them suitable for any rack. They are available in 2 different heights and 2 different widths (42U and 48U, and 600 mm and 800 mm). Once the rack door has been replaced by the adapter frame, the CyberRack unit can be hung in the adapter frame and connected to the chilled water supply.

No mixing of hot and cold air

CyberRack Active Rear Door units are installed on the rear of the rack. The active heat exchanger doors cool the server right at the source and prevent heated air from entering the room (see illustrations below).

Integration with CyberCool 2

Solutions from STULZ are perfectly coordinated to work together, to cool your IT systems efficiently and reliably. The CyberRack unit works most efficiently in combination with the CyberCool 2 chiller.

Investments in the quality, reliability and efficiency of STULZ air conditioning and chilled water solutions pays off during operation after just a short runtime thanks to energy savings and operational reliability.

CyberCool 2 product information

Control and monitoring

C2020 controller for controlling and monitoring the air conditioning system
Active temperature control: The controller regulates the fan speed in accordance with the measured supply and return air values.
Direct connection to BMS systems via ModBus RTU protocol or Ethernet

Options

Thanks to the diverse options and equipment options available, you can perfectly adapt the CyberRack Active Rear Door to your particular requirements regarding air conditioned server racks.

Adapter frames for 42U and 48U racks with a width of 600 or 800 mm
Differential pressure control for protecting the server rack fans against overpressure
2 or 3-way CW valves, also available as a pressure independent 2-way PICV
Cooling capacity display
Air temperature and humidity sensor
Supply water temperature sensor
Water warning system incl. sensor
Flexible connection hoses

Pressure independent control valve

The pressure independent control valve (PICV) combines the functions of control, hydraulic compensation and flowrate measurement. The water flowrate required for cooling is set directly by the CyberRack control system.

Low water-side pressure drops cut pump energy costs
Lower investment and installation costs and faster start-up thanks to automatic hydraulic compensation
The defined water flowrate ensures stable and precise control in all load states
The cooling capacity of each individual server rack is recorded.

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

Test Center

AC server racks: 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 CyberRack Active Rear Door, 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 for server rack ac units 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.

More information