TY - CONF T1 - Modeling Windows in DOE 2.1E T2 - Thermal Performance of the Exterior Envelopes of Buildings V Conference Y1 - 1992/12// A1 - M. Susan Reilly A1 - Frederick C. Winkelmann A1 - Dariush K. Arasteh A1 - William L. Carroll AB - The most recent version of the DOE-2 building energy simulation program, DOE-2.1E, provides for more detailed modeling of the thermal and optical properties of windows. The window calculations account for the temperature effects on U-value, and update the incident angle correlations for the solar heat gain properties and visible transmittance. Initial studies show up to a 30% difference in calculating peak solar heat gain between the detailed approach and a constant shading-coefficient approach. The modeling approach is adapted from Lawrence Berkeley Laboratorys WINDOW 4 computer program, which is used in the National Fenestration Rating Council (NFRC) U-value rating procedure 100-91. This gives DOE-2.1E the capability to assess the annual and peak energy performance of windows consistent with the NFRC procedure. The program has an extensive window library and algorithms for simulating switchable glazings. The program also accounts for the influence of framing elements on the heat transfer and solar heat gain through the window. JF - Thermal Performance of the Exterior Envelopes of Buildings V Conference CY - Clearwater Beach, FL U1 -

Windows and Daylighting Group

U2 - LBL-33192 ER -