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With only one CRAC unit working, there is significantly larger maldistribution in the airflow rates through the perforated
tiles, comapred to the case where both CRAC units are working. In fact, there is reverse flow (flow into the plenum) through the tiles near the left CRAC unit. Note that with only one CRAC unit operating, the
length over which the flow coming out of this CRAC unit has to travel is doubled. As a result, the pressure variations under the raised floor become larger and the airflow distribution becomes more nonuniform.
It is interesting to note that the adverse effects of the failed CRAC unit are felt away from the failed unit, not close to it. This
behavior is somewhat counter-intuitive.
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