ASTM WK35104

    New Test Method for Measuring the Solar Heat Gain Coefficient of Fenestration Systems Using Calorimetry Hot Box Methods

    (What is a Work Item?)

    Developed by Subcommittee: C16.30 | Committee C16 | Contact Staff Manager


    1. Scope

    1.1This test method provides requirements, and guidelines, and specifies calibration procedures required for the measurement of the Solar Heat Gain Coefficient, SHGC, of fenestration systems and glazing systems installed in a solar calorimeter (hot box). 1.2This test method applies to all fenestration systems, glazed apertures in buildings intended for the controlled admission of solar radiation. This includes windows, glazed doors, translucent panels, skylights, and glazing systems incorporating integral or attached shading devices such as insect screens, drapes, shades, and blinds. NOTE 1:The methods described in this document may also be adapted for use in determining the SHGC of sections of totally opaque building wall, roof and floor assemblies containing thermal anomalies, which are smaller than the solar calorimeter metering area. 1.3 This test method specifies the necessary measurements to be made using solar calorimeters exposed to solar radiation under clear sky conditions (outdoors) or using artificial solar radiation (indoors). The test sample may be illuminated with either direct beam radiation only, or with direct beam plus diffuse sky and ground reflected radiation, as long as the method of irradiation is specified and the method employed satisfies the specifications within this document. 1.4A discussion of the terminology and underlying assumptions for measuring the Solar Heat Gain Coefficient is included.

    This test method will be used to determine the SHGC of fenestration for generating NFRC ratings and Energy Star Certification


    calorimeter; doors; fenestration; heat; hot box; solar; SHGC; solar calorimeter; skylights; U-factor; windows

    The title and scope are in draft form and are under development within this ASTM Committee.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    William DuPont

    Draft Under Development