If sub-floor pressure is the factor for a cabinet overheating but it can not be relocated, there is a solution available. Smart fan assisted cooling can help remedy this issue. If the CRAC unit can not blow the cold air to the perforated tile, then draw it there with smart fan tiles that mount below the perforated tile. Smart fan-assisted floor tiles utilize a temperature probe that is mounted in the target cabinet. This probe has set thresholds that act as a thermostat for the fan tile. The fan ramps up speed as the requirement increases. As the requirement decreases the fan will return to an idle speed.
It is critical to make sure that there is enough cooling capacity to support the data center load, otherwise fan tiles will only relocate the hot spot. It is also important to know that fans require power and therefore produce heat which is why you should install a variable speed fan tile that ramps up fan speed only when it is required.
The figure below illustrates how the fan assisted floor tile extracts the air from the sub-floor no matter what the sub-floor pressure is. The results (purple plume) are dramatic compared to the (yellow plume) passive perforated tile next to it.
Intelligent air movers for the exhaust air are also available. Much like the floor tile, the ducted fan utilizes a temperature probe to control fan speed. The air mover is placed above the suspended ceiling. 12” flex duct is routed from a ceiling vent placed above a hot spot, to the unit, and exhaust from a ceiling vent placed above a CRAC unit.
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