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1503.1-80

AAMA 1503.1-80-Voluntary Test Method for Thermal Transmittance of Windows, Doors and Glazed Wall Sections

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This method applies to the measurement of the thermal transmittance of windows, doors and exterior glazed wall sections. In comparison to ASTM Method C 236, Test for Thermal Conductance and Transmittance of Built-Up Sections by Means of the Guarded Hot Box, which is primarily applicable to panels with parallel surfaces or panels with irregular surfaces and relatively low thermal conductance, this method is specifically intended for measurements on heterogenous constructions with variations in thickness, conductivity and surface profile, which are common to windows, doors and glazed wall sections containing glazing and/or opaque panels. Typically, such constructions have relatively high thermal conductance, and air films contribute significantly to lower the overall coefficient of heat transfer. This method utilizes pre-calibrated exterior and interior surface coefficient conditions as compared to the calculated surface coefficients of ASTM C 236, which are derived from thermocouple temperatures. The exterior surface is subjected to airflow to simulate the air film coefficient caused by natural wind conditions. This test does not include heat loss due to air infiltration.

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