Micross

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Performance Prediction of Fans Placed in Series
Keywords: Fan performance, Fan modeling, Fans in series
When designing equipment that use fans for forced convection cooling, the situation frequently arises when the airflow impedance through the system is high enough that one fan will not provide the pressure and consequently the airflow needed to cool the unit. When this situation occurs and there is no acceptable solution available that will provide adequate airflow with a single fan, two fans in series may be able to provide the needed airflow. Two fans in series should, in theory, be able to double the available static pressure of just one fan. However, if the second fan is simply placed downstream of the first fan, there will be degradation in the theoretical static pressure developed by the fan pair. This presentation will show the results of an investigation to determine how close a series fan arrangement can come to doubling the static pressure while minimizing the amount of space required for the two- fan combination. The presentation will consist of using CFD simulations with a rotating frame of reference around the impellers to predict the series fan performance and will also show how well the simulations agree with actual test data taken using an airflow test chamber to measure the pressure and airflow of the series arrangements.
Guy R Wagner, Director
Electronic Cooling Solutions Inc.
Santa Clara, California
United States


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