Transcription of Cooling Fan Calculations - | Component Engineering …
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Cooling Fan Calculations - | Component Engineering …
Cooling FAN REQUIREMENTS Calculations . Determining System Impedance Determining the actual airflow produced by a fan mounted in an enclosure is much more difficult than calculating the airflow required. Obstructions in the airflow path cause static pressure within the enclosure, referred to as system impedance (expressed in static pressure as a function of flow in CFM). To maximize airflow, any resistance should be minimized, except for baffles that may be necessary to direct the airflow. A typical system impedance curve for electronic equipment follows what is called the "square law". This law states that static pressure changes as a square function of changes in the CFM. The chart to the right displays typical impedance curves.
Causes of Fan Noise Noise emanating from axial fans is a function of many variables and causes: Whirl pooling: This is a broadband noise source generated by air separation from the blade surface and trailing edge. It can be partially controlled by good blade profile design, proper pitch angle and notched or serrated trailing blade edges.
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