This paper investigates two simplified methods to model axial flow fans in a multiple fan operating environment using computational fluid dynamics (CFD). The application of the two methods are explained and illustrated, after which they are applied to a multiple fan CFD model. The CFD results are compared to experimental results to illustrate the applicability of the methods. It is concluded that the simplified presentation of an axial flow fan is particularly helpful in predicting the system volumetric effectiveness of multiple fan installations subjected to adverse inlet flow conditions, particularly during windy periods.
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