If a raised floor is present and intended to be used as a supply plenum remember that is essential to maintain a constant and even Static Pressure under the raised floor to achieve effective cooling through the vented floor tiles. Consider the use of pressure sensors to balance under floor static pressure if used as a supply plenum.
Use of phases must be balanced across the UPS(s) in distribution to IT equipment within cabinets. Failure to do so could risk a phase imbalance and a potential trip of the UPS. Power phase loading at the UPS level and across the site should be monitored and kept balanced during IT equipment installation.
Assuming single phase devices are deployed within an individual cabinet all should use supplies from the same phase to prevent the potential for greater than 230 volts in the same cabinet. Only supplies from the same single phase should be provided within any individual cabinet and power supplies should never be “Daisy Chained” either within or between cabinets. It may also be that adjacent cabinets are required to be on same phase to prevent line to line voltages between cabinets. Equipment requiring 3-phase supplies within a cabinet should be clearly labelled as using 3-phase and the supplies into these cabinets should not be used to power adjacent cabinets.
To correctly protect supplies into cabinets “D” type Breakers are recommended to be used on cabinet circuits and all cabling (power and comms), should be clearly and accurately labelled.
It is worth noting as a guide that a typical single 32 Amp supply @ 230 Volts can deliver about 7kW per cabinet (Assuming Power Factor corrected equipment and N+1 redundancy if the cabinet has twin power supplies). It is also common to use a 16 Amp supply @ 230 Volts which can deliver about 3.5kW per cabinet.
IT equipment should always be purchased according to agreed standards and specifications for power, cooling and resilience etc. IT equipment selection should consider the appropriate ASHRAE environmental set points and energy efficiency expectations. Always select energy efficient IT equipment when specifying and purchasing new and replacement IT equipment. As a minimum this should be according to current Energy Star specifications. Ensure that the Delta T of the cooling system is closely matched to IT equipment specifications. This may allow a reduction in total airflow, while meeting the same cooling capacity and reducing operational costs by optimising cooling system efficiency.
Future-tech have been designing, building and managing business critical data centres since 1982. The experience gained in being involved in the data centre sector from the outset has resulted in Future-tech sites achieved 99.999% uptime during 35+ years of operation. Future-tech has a team of experienced, skilled and highly trained in-house Data Centre Engineers capable of properly maintaining and operating business critical data centre sites of all sizes. For more details please contact Richard Stacey on 0845 900 0127 or at firstname.lastname@example.org