Thermal resistance of a window with an enclosed venetian blind: Guarded heater plate measurements

Ned Y.T. Huang, John L. Wright, Michael R. Collins, Euyatar Erell

    Research output: Contribution to journalConference articlepeer-review

    21 Scopus citations


    Window solar gain is known to have a strong influence on building energy consumption and peak cooling load. Venetian blinds are routinely used to control solar gain. Software based on one-dimensional models is available to accurately predict the thermal performance of glazing systems, but the development of models for windows with shading devices is at a very early stage. A guarded heater plate apparatus has been used to measure center-glass heat transfer rates through a double-glazed window with a venetian blind in the glazing cavity. Variables examined include pane spacing, temperature difference, slat angle, and the presence of a low-emissivity coating. Results were compared with earlier measurements. The data collected provide direct guidance in the development of models to predict U-factor and solar gain for this type of glazing/shading system, leading to a more structured and quantitative design procedure.

    Original languageEnglish
    Pages (from-to)13-21
    Number of pages9
    JournalASHRAE Transactions
    Volume112 PART 2
    StatePublished - 1 Jan 2006
    Event2006 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, ASHRAE - Quebec City, QC, Canada
    Duration: 24 Jun 200528 Jun 2005

    ASJC Scopus subject areas

    • Building and Construction
    • Mechanical Engineering


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