Drastic changes in humidity can be attributed to CRAC unit placement as well as multiple CRAC units not working together for a common goal. A short circuiting CRAC unit can over dry the air causing another CRAC unit in the same facility to register this dry air begin humidifying it-thus creating an endless energy draw. In order for a CRAC unit to humidify the air, it must heat up and essentially produce steam. If the CRAC unit is heating then it is not cooling, there by reducing capacity. Several CRAC units can be rotating through these cycles. They are trying to condition the air individually rather than working together. It is imperative to reduce short circuiting to a minimum. Also network the CRAC units so they work as a team. A CFD study can find the source of the short circuit and help determine measures to reduce or remove them.
Another option is to remove humidity control from the CRAC units all together. Utilize a more efficient means for humidification by deploying ultra sonic humidifiers. Keeping the humidification separate allows the CRAC unit to dedicate their energies for cooling only.
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