![]() ![]() Heat Load In Watts: Q (Watts) = 0.318 x CFM x ΔT (☏).You can control VFDs by monitoring the static pressure or temperature.Ĭalculating the Relationship between Heat, Airflow Volume, and ΔT: Cooling units with variable frequency drives (VFD) – Adjusts to server fluctuations by varying the amount of supplied conditioned air, so energy is not wasted moving more air than is required.Dampers – Can be manual, or auto controlled by temperature or static pressure.Fan-assisted tiles – Can be fix-fan speed, on:off, or controlled by temperature or static pressure.There are times when you may want to employ some advanced technologies into your AFM strategy. Using static pressure, you can read the volume of flow from the manufactures’ pressure-vs.-flow rate flow curve. Static Pressure Gauges – Can also be used to determine volumetric flow rates from tiles and grates.Capture Hoods – Those with back-pressure compensation work well and are the most accurate and easiest to use.High-velocity areas can cause inaccurate high-velocity and volume readings. They don’t work so well for measuring perforated tiles and grates velocity or airflow volume since perforated tiles and grate structures create great variations in velocity. They do work well when the cross section of the measured airflow has uniform velocity. Rotating Vane Anemometer – Unfortunately, they don’t work well for data center environments! A rotating vane anemometer senses air movement and then calculates its velocity.The volume supplied should be slightly more than what’s required by servers at full load.Ī few ways that you can measure airflow CFM include the following: Volume required by IT equipment can vary due to server activity.AFM considers the flow required by each cabinet, and the row as a whole.→ If there is no containment, then it becomes more important to match airflow volumes of tiles to the cabinets that are immediately adjacent.→ If there is containment in place, then balancing the total volume of conditioned air supplied into the cold aisle is sufficient.Server workload – higher the workload generally the higher the ΔT.Īirflow management considerations must be made at both the row and cabinet levels:.Configuration – Firmware configurations for energy-saving features affect airflow volumes and ΔTs through IT equipment.Design – IT manufacturers are designing to higher ΔTs in an effort to reduce the power consumption of IT equipment cooling fans.Less understood is how Delta T (ΔT)¹ through IT equipment affects airflow considerations. ![]() Most are well aware that there is a direct link between conditioned airflow volumes and the amount of IT equipment (or kilowatts) that can be cooled. ![]()
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