Operating Point – Thermal Design

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The two figures below show the nonlinear relationship between airflow and static pressure for a typical fan. The performance of a fan in a specific application is determined by the intersection of the System Impedance Curve and the Fan Characteristic Curve. The System Impedance Curve is a property inherent to an individual electronics enclosure. This curve can easily be generated experimentally, by testing the enclosure pressure at various airflow rates.





















 







































Typical Relationship between Airflow and Static pressure for an Axial Cooling Fan
Typical Relationship between Airflow and
Static pressure for an Axial Cooling
Fan




























Intersection of Fan and Enclosure Curves with System Operating Point
Intersection of Fan and Enclosure Curves