Nortek Air Solutions has introduced the ADHX 35-6B, a 35kW active rear door heat exchanger (ADHX) to its ServerCool™ data center liquid cooling product line.
The ADHX 35-6B is the next generation of ServerCool’s ADHX featuring upgrades in redundancy, durability, and energy efficiency. The upgraded design, which is applicable for retrofits and new data centers with chilled water facilities, consumes less than 500 watts of power for the 35kW of cooling it provides, which helps contribute to a PUE as low as 1.033. 

The upgraded design includes redundant temperature sensors on both the ultra slim coil’s inlet and outlet to prevent overheating and provide an effective failsafe. Coils also offer both top and bottom water connections to accommodate any data center hydronic piping configurations. 

A 4-inch-wide color Modbus and BACnet-compatible touchscreen controller includes dew point control and airflow/air pressure user-definable control. Controller also monitors, controls and records entering and leaving water/air temperatures, and the data center hall’s ambient. A control valve efficiently modulates flow rates across the door with the ability to control dew points and prevent condensation with a modulating optional integrated actuator valve.

The ADHX 35-6B control sequencing also incorporates a fan speed loop. The fan speed loop’s sensors evaluate rack server fan performance and adjust the corresponding variable EC axial fan speed from minimum to optimum speed to satisfy the coil temperature set point. An override feature allows fans to run at 100% capacity during high temperature events. 

--Nortek Air Solutions