Knurr CoolTrans | Knurr Rack Cooling System


Knürr CoolTrans

The link between water circulation systems in the building and the server rack.

The reliable link between water circulation systems in the building and the server rack.
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Water Cooling System

Knurr CoolTrans units combine a building's main cold water circulation system with a data center's secondary cold water system by means of a water-to-water heat exchanger, allowing facilities to overcome complex circulation systems, and ensuring that data centers have no condensation build up. The units are compact and energy-efficient.

Knürr CoolTrans® is indespensible for the safe operation of water-cooled racks.

  • Hydraulic separation of the cold water circulation system in the building from the cooling water in the data center
  • Use of the best quality components from building technology
  • Integration of all thermohydraulic components for regulated liquid cooling (pumps, valves,mixers, heat exchanger, expansion tank)
  • Redundant components permit uninterrupted operation, even during servicing
  • Connection of individual Knürr CoolTherm®and Knürr CoolAdd®units to the Knürr CoolTrans units
  • Modular design for heat loads in excess of 100 kW
  • Constant cooling water temperature with adjustable set point temperature
  • Constant cooling water quantity regardless of the hydraulic arrangements in the building
  • Operational reliability through system separation (permits leakage monitoring and prevents corrosion and fouling effects thanks to a defined water quality on the secondary side)
  • Operational reliability through redundancy
  • Operational reliability through recording and centrally monitoring the operating parameters including warning and alarm signals
  • Possibility of controlling emergency operation
  • Flanged joint for adding multiple Knürr CoolTrans units
  • Dew point dependent cooling water flow temperature increase to prevent condensation water and for piping without insulation
Technical Data
Capacity Width Hight Depth Pipe Connection Differential
Pressure: ext.
Elec. Connection
Water Volume
        primary secondary primary secondary 50 Hz primary secondary
50 kW 450 mm 1010 mm 820 mm 1" 5 x 1" 1,5 bar 0,7 bar 230 V; 0,8 kW 8,42m³/h 7,16m³/h
75 kW 450 mm 1010 mm 1200 mm 1" 5 x 1" 1,5 bar 1,1 bar 400 V; 1,8 kW 12,78m³/h 10,74m³/h
100 kW 1640 mm 1890 mm 600 mm 2xDN100 2xDN100 1,4 bar 1,2 bar 400 V; 1,6 kW 16,79m³/h 14,30m³/h


  Primary Circuit Secondary Circuit   Conditions of Setup Site:
  Also Available:
Temperature Supply: 4“ 8°C 12“ 14°C Capacity 50 respectively 75 kW
(air conditioned room)
capacity 100 kW (any)
Pumps - 60 Hz
2 heat exchangers for free cooling
Redundant electric feed
Temperature Return: 11“ 14°C 18“ 20°C
Operating Pressure: 16 bar 6 bar
Antifreeze Agent: up to 35%   Note: Further temperatures and diff. pressure possible on request
Specification subjects to change without notice / errors and omissions excepted / Electrical data as operating power input