Knurr DCL | Knurr Air Supply | Knurr DCL Rack Cooling

PRODUCTS

Knürr DCL

The Knürr DCL is a precision cooling unit in chilled water configuration to be installed side by side with high-density computing racks.

Knürr DCL can be used as closed air loop rack cooling device (L version) or as hybrid (H) with air supply to the front door to the room. This versatility is achieved by using interchangeable side panels to alter the air flow pattern. Hybrid version and closed loop version support “Cold Room” concept. Air is drawn by fans from the rear of the Knürr DCL through the heat exchanger cooled down and discharged into the front.

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Overview

Knürr DCL Air Supply

The Knürr DCL is a thermal management cooling unit in chilled water configuration to be installed side by side with high-density computing racks.

Knürr DCL can be used as closed air loop rack cooling device (L version) or as hybrid (H) with air supply to the front door to the room. This versatility is achieved by using interchangeable side panels to alter the air flow pattern. Hybrid version and closed loop version support “Cold Room” concept. Air is drawn by fans from the rear of the Knürr DCL through the heat exchanger cooled down and discharged into the front.

The Knürr DCL provides all the necessary functions of a standard precision air conditioner, including cooling, air filtration (optional), condensate management and temperature control. Alarm functions and network communication interface allows unit to be integrated into the building infrastructure.

Knürr DCL is available in two different cooling capacities: 34kW with 6 fans at a height of 2200mm and 30kW with 5 fans 2000mm in height.

Features
  • EC plug fans (5 or 6 depending on cooling capacity)
    High performance EC plug fans comply with 2005/32/EC European parliament directive for energy efficient appliances. Fan speed can be changed from 30% to 100% thus providing energy savings, great flexibility and long life time.
  • Rack cooling controller provides high level of availability of the DCL. It features built in multi- level fail safe functions. The controller provides (as standard) network communication via HTTP, HTTPS and SNMP (up to V3). The controller also allows creation of unit groups for team work mode.
  • Hydrophilic coated heat exchanger coil
    Hydrophobic coating and vertical fin orientation significantly improves condensate water drainage and avoid the risk of water droplets being carried by air flow into the cold aisle. This feature also allows using very low chilled water temperature levels. At the same time the unique design of the heat exchanger significantly reduces the air and water pressure drop thus decreasing power consumption of the unit. Micro turbulence effect enhances heat transfer. Heat exchanger is equipped with bleeding and draining valves.
  • Modulating valve
    The 3-way valve (controlled by highly reliable spring loaded actuator) controls the chilled water flow through the heat exchanger coil. The internal controller manages the valve actuator movement in order to maintain the desired cooling air temperature for various entering water temperatures. Configuration can be manually switched to 2-way by manual ball valve.
  • Power supply
    One of three different power supplies can be selected based on customers on site power grid.
  • 208/230V / 1ph-60Hz
  • 240V / 1ph-60Hz
  • 230V / 1ph-50Hz
  • Large graphic display
    Large color touchscreen display provides information about unit performance and allows the parameters to be changed by operator. Unit can be ordered without display if desired.

Optional features are:

  • Condensate pump
    Optional condensate pump can be ordered to remove condensate that has occurred during units’ operation. Condensate pump is located in the bottom of the unit and its’ operation is automatic.
  • A / B transfer switch
    Unit can be equipped with power transfer switch. Unit is then powered by two independent power supplies. In case of power supply failure the other power supply takes over powering the unit. This grants higher operational reliability.
  • Rack cooling controller provides optionally Bacnet, Modbus RTU and digital user inputs and outputs for communication.
  • Calorific flowmeter
    To obtain precise and reliable reading of chilled water flow and cooling performance the Knürr DCL can be equipped with calorific flow meter device. Cooling capacity is calculated based on chilled water flow and temperature difference of the water across the heat exchanger. Calculated value is then shown on the display.
  • Humidity monitoring and smoke detection
    Unit can be equipped with smoke detecting and / or humidity sensors to provide more information about cooling air especially inside closed architecture units.
  • DCM options
    For monitoring adjacent racks DCL can be ordered with door contacts, automatic door opening  and additional temperature sensors. These options grant outstanding datacenter monitoring and control.
Benefits
  • High density, high precision cooling unit with excellent floor space utilization
  • Reconfigurable air flow patterns to suit changing needs
  • Wide range of possible chilled water temperature feed
  • High energy efficiency due to EC fans and low water and air pressure drop
  • High reliability due to first grade components
  • Outstanding data monitoring system due to state of the art internal controller
  • Superior serviceability
Technical Data

 

DCL 30

DCL 34

Nominal cooling capacity*

30 kW

34 kW

Air flow

5000 m3/h (3237 CFM)

6000 m3/h (3885 CFM)

Water flow

4.5 m3/h (20 GPM)

5.0 m3/h (22 GPM)

Max. water pressure

10 bar (145 PSI)

10 bar (145 PSI)

Number of fans

5

6

Fans power consumption

5 x 170 W

6 x 170W

Dimensions (WxDxH)

300x(1000-1300)x2000 [mm]

300x(1000-1300)x2200 [mm]

Heat exchanger internal fluid volume

10,72 l / 2.83 gal.

 

11,93 l / 3.15 gal.