Andrew Placek
Universal Blower Pac, Inc.
Flow Measurement and Average Demand
Proper equipment design begins with a thorough understanding of your process requirements. All design engineers are concerned with the quality of a particular air delivery solution, but many have not adequately modeled the problem. Sometimes the end result is a quality system that when placed into operation is not at all suited for the real world application.
Consider the application of mixing a tank through diffused aeration. Mixing is a volume dependent application where fluid displacement to achieve a homogonous mixture is the goal. At the point where the desired mixture is attained any excess air put into the system is wasted. Since mixing through diffused aeration is a costly and an ongoing expense, any reduction you can make will save money continuously over the lifespan of the equipment.
We recommend use of volumetric flow (ACFM or m^3/min) measurement versus a mass flow (SCFM or Nm^3) measurement for this volume dependent application. A mass flow measurement will result in a higher volume and excess fluid displacement when temperature and elevation increase above the standard volume’s defined point (this is typically defined in the US as the amount of air in one cubic foot at 68F, 36% RH and sea level).
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