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The velocity of the airflow coming from the supply floor tile or grate can also influence the amount of air actually entering the ITE cabinet, as well as drawing unwanted warm air if there are gaps under the bottom of IT cabinets. While a relatively complex subject, in general, the higher the velocity the greater the impact. This is often overlooked; however an accurate CFD model will show the impact of this.
As a result, the new H1 Class of High Density Air Cooled IT Equipment was created to allow operation in air cooled data centers. The H1 allowable range is 59°F to 77°F , however , the recommend temperature range is limited to 64.4°F to 71.6°F . These higher power and power density requirements effectively create much more stringent requirements for ensuring proper airflow to the ITE.
Energy Efficiency Cost of Airflow Leakage In effect, any supply airflow from the cooling system that is not passing only through the ITE is considered bypass airflow and wasted cooling and fan energy. This is also called oversupply or over ventilation. While it is nearly imsible to accomplish this as a practical matter, to ensure that ITE airflow requirements are met, a certain amount of oversupply is necessary. However, unnecessary and preventable leakage should be controlled wherever sible or practical.
For example, it takes 158 CFM at a ∆T of 20°F to transfer one kilowatt of heat. Conversely , it takes twice that amount of airflow (316 CFM) at 10°F ∆T . This is considered a relatively low ∆T , which increases the overall facility cooling unit fan speeds to deliver more air flow to ITE.
In order to deliver the higher airflow for raised floor systems, higher underfloor static pressures are required to provide the pressure for the perforated tile or floor grate supplying air to the cold aisle. In the majority of data centers the cold aisle is typically two tiles wide, which means that there is one supply tile per ITE cabinet. There is a wide range of perforated floor tiles, grates and grills —as listed in Table 3.