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Related to CRACS: cracks, Crocs
CRACSCenter for Research on Arms Control and Security (Jordan)
CRACSCape Range Area Control System
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References in periodicals archive ?
Here we present a coordinated real-time monitoring and control algorithm that ensures near-optimum cooling for the data centers equipped with return-air-controlled CRACs. The algorithm presented here employs the concept of influence index metrics developed by the authors of this paper previously (Bhagwat et al.
"If air is being distributed to where it needs to be, you can cut back on the CRAC units."
Upper humidity limits are typically controlled by the cooling coils in CRAC, CRAH or air-handling units (AHUs) that serve the data center.
Gradually increase CRACs, leaving air temperatures so that cold aisle temperatures are between 64.4 degrees F.
where n is the number of tiles of a given type identified by the subscript and QCRAC includes airflow from all CRACs.
In an ideal situation, computer room air conditioning (CRAC) unit capacity would exactly match the server load, and the CRAC airflow would exactly match the server airflow.
Hot air from two rows is exhausted into a "hot" aisle, raising the temperature of the air returning to the CRAC unit and allowing it to operate more efficiently (Figure 1).
Each enclosure was set to a 20 kW load with all 3 CRAC units operated at full capacity.
This paper proposes data center air management metrics that in addition to recirculation, also address negative pressure flow, bypass flow and balance of server and CRAC unit flows (Tozer 2006a).
This investigation presents an experimental investigation of plenum airflow near the CRAC unit, with special attention to reversed flow, or warm air from the facility being drawn down into the RFP due to a relatively low static pressure in the plenum.
* If CRAC units are aligned in parallel rows on a raised floor, then each row of CRACs should exhaust air in a direction that increases the static pressure across the floor rather than CRACs exhausting such that their plumes collide, causing decreased static pressure in these regions and overall loss of chilled air to the raised floor (Koplin 2003).
One of the challenges of this arrangement is to provide the proper distribution of the chilled air to the racks provided by CRAC units situated on the raised floor.