Infrared Imaging Results of an Excited Planar Jet

    Research output: Contribution to conferencePaper


    Planar jets are used for many applications including heating, cooling, and ventilation. Generally such a jet is designed to provide good mixing within an enclosure. In building applications, the jet provides both thermal comfort and adequate indoor air quality. Increased mixing rates may lead to lower short-circuiting of conditioned air, elimination of dead zones within the occupied zone, reducedenergy costs, increased occupant comfort, and higher indoor air quality. This paper discusses using an infrared imaging system to show the effect of excitation of a jet on the spread angle and on the jet mixing efficiency. Infrared imaging captures a large number of data points in real time (over 50,000 data points per image) providing significant advantages over single-point measurements. Weused a screen mesh with a time constant of approximately 0.3 seconds as a target for the infrared camera to detect temperature variations in the jet The infrared images show increased jet spread due to excitation of the jet. Digital data reduction and analysis show changes in jet isotherms and quantify the increased mixing caused by excitation.
    Original languageAmerican English
    Number of pages9
    StatePublished - 1991
    EventASME International Solar Energy Conference - Maui, Hawaii
    Duration: 4 Apr 19928 Apr 1992


    ConferenceASME International Solar Energy Conference
    CityMaui, Hawaii

    Bibliographical note

    Prepared for the ASME International Solar Energy Conference, Maui, Hawaii, 4-8 April 1992

    NREL Publication Number

    • NREL/TP-254-4515


    • building technologies
    • cooling
    • heating
    • infrared imaging


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