Intro

Indirect Dynamic Free Cooling


Maximum savings potential thanks to Indirect Dynamic Free Cooling

Indirect Dynamic Free Cooling from STULZ is the only system worldwide with automatic efficiency optimization. Dynamic switching operation and control without a fixed free cooling start value and an additional operating mode guarantee maximum savings potential.

Leistungsaufnahme Klimagerät: 16%

Betriebsmodus:

Freie Kühlung

Raumlast 40%

Aktive Komponenten:

Freikühlregister

Außentemperatur:

Rücklufttemperatur: 25°

 

 

The Free Cooling system with dynamic switching operation and control

In classic precision cooling, the necessary cold is created independently of the outside temperature by means of mechanical cooling. The most energy-intensive component here is the compressor.

To reduce mechanical cooling to a minimum, STULZ developed a Free Cooling system with dynamic switching operation and control for in-house units. This controls all active components, dependent on the outside air temperature and current heat load.

 

Benefits

Benefits of the dynamic switching operation and control at a glance

  • Minimal compressor running time

  • Switching operation and control according to actual heat load

  • Maximized periods of Free Cooling

  • Cooling via consumption-optimized operating mode

  • Minimized total energy consumption

  • Reduction of operating costs by up to 60%

The dynamic switching operation and control reduces the compressor running time to a minimum and reduces the total energy consumption by up to 60%, taking into account all active components.

The system cools precisely and dynamically according to the current heat load. This means that only the required cooling capacity is ever generated and there is no energy-intensive oversupply. Taking into consideration outside temperature and current heat load, the dynamic switching operation and control selects the optimum operating mode without a fixed Free Cooling start value.

If the outside air temperature is 3 Kelvin under the return air, the outside air can even be used for cooling. The Free Cooling periods are maximized by the dynamic switching operation and control and extended Free Cooling, reducing operating costs to a minimum.

 

 

Operating modes

More Free Cooling, fewer costs

To further extend the Free Cooling operation and thereby drastically reduce operating costs, the dynamic switching operation and control has another operating mode: Extended Free Cooling

In the Extended Free Cooling operating mode, the use of variable-speed pumps and dry coolers with fan speed control maintains the cooling capacity by increasing the airflow. This means the Free Cooling operation is also extended and the operating costs are reduced to an absolute minimum.

Operating modes

Free Cooling

Compressor: Off

Fan: Set point

CRAC:
CW: Variable / DX: Off

Standby unit: On

Pumps: Variable

Dry cooler fans:
Variable

Extended Free Cooling

Compressor: Off

Fan: Max.

CRAC:
CW: Max. / DX: Off

Standby unit: On

Pumps: Max.

Dry cooler fans:
Max.

Mixed mode

Compressor: Variable

Fan: Set point

CRAC:
CW: Variable / DX: Staged

Standby unit: On

Pumps: Max.

Dry cooler fans:
Max.

Compressor mode

Compressor: On

Fan: Set point

CRAC:
CW: Off/ DX: Max.

Standby unit: Off

Pumps: Min.

Dry cooler fans:
Variable

Standby management

 

Standby management for even more efficiency

To ensure the greatest possible safety in air conditioning, redundancies are often created in the air conditioning units. This means that more units are installedthan are actually required for air conditioning.

With the usual passive redundancy, these units are only (automatically) put into operation when a running device switches off due to an error.

The dynamic switching operation and control enables the use of standby units with the greatest efficiency possible. With the active redundancy used for this, all installed units are in operation – even the standby units.

The potential of the EC fans is fully utilized: All units are operated with an airflow which is the same overall, but reduced for each unit. The reduced airflow means that the power consumption of the fans and the related operating costs are reduced even further.

Standby-Management und Kubisches Gesetz

Products Downloads

Downloads

  • Stulz White Paper Free Cooling For Data Centers V1


    Stulz White Paper Free Cooling For Data Centers

    • File: Stulz_White_Paper_Free_Cooling_for_Data_Centers_V1.pdf

    • Type: Adobe PDF

    • Size: 885,86 KB

    • Language: English (US)

    • Date: 2015-11-06

    download
  • Dynamic Free Cooling White Paper


    State of the Art Energy Efficient Data Centre Air Conditioning

    • File: STULZ_White_Paper_Dynamic_Free_Cooling_R2_0408_en.pdf

    • Type: Adobe PDF

    • Size: 77,54 KB

    • Language: English

    • Date: 2008-04-01

    download
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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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