Experimental Study of Vortex Diffusers

    Research output: NRELTechnical Report


    This report documents experimental research performed on vortex diffusers used in ventilation and air-conditioning systems. The main objectives of the research were (1) to study the flow characteristics of isothermal jets issuing from vortex diffusers, (2) to compare the vortex diffuser's performance with that of a conventional diffuser, and (3) to prepare a report that disseminates the resultsto the designers of ventilation and air-conditioning systems. The researchers considered three diffusers: a conventional round ceiling diffuser and two different styles of vortex diffusers. Overall, the vortex diffusers create slightly more induction of ambient air in comparison to the conventional diffuser.
    Original languageAmerican English
    Number of pages35
    StatePublished - 1995

    NREL Publication Number

    • NREL/TP-472-7331


    • air conditioning
    • average outlet velocity
    • diffuser area factor
    • diffuser neck area
    • diffuser neck diameter
    • isothermal jets
    • neck velocity
    • rotational velocity
    • translational velocity
    • ventilation
    • vortex diffusers


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