Environmental Guidelines
DVN 5000
24-10520-22 Rev. –
33
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2009 Johnson Controls, Inc.
Data Centers and Raised Computer Room Floors
Data center installations require careful airflow design by a professional engineer
skilled in the HVAC trades.
Use a total system approach, and take into account the thermal loads along with the
minimum static pressure required inside the cabinet.
Provide selective openings in the raised floor instead of allowing air to leak out
where not required. If excess air enters some enclosures, other enclosures will not
get the required airflow and equipment may overheat.
Airflow under the computer floor must be directed and managed, which can only be
accomplished by measuring the CFM and static pressures inside the enclosures.
Consider the following to control the static pressure inside the cabinet:
The amount of air let into the bottom
The design of the rear door
The careful placement of blank panels
For extremely high heat densities, or large variances between heat densities in
adjacent enclosures, additional spot cooling may be required. This can be
accomplished by utilizing a variety of solutions, one of which is an
enclosure-mounted cooling system. For higher BTU/Hr., popular types of these
systems use flexible hoses and liquid-to-air heat exchangers.