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.

%B Thermal Performance of the Exterior Envelopes of Buildings V Conference %C Clearwater Beach, FL %8 12/1992 %G eng %L LBL-33192 %1Windows and Daylighting Group

%2 LBL-33192 %0 Report %D 1993 %T Window 4.0: Documentation of Calculation Procedures %A Elizabeth U. Finlayson %A Dariush K. Arasteh %A Charlie Huizenga %A Michael D. Rubin %A M. Susan Reilly %XWINDOW 4.0 is a publicly available IBM PC compatible computer program developed by the Building Technologies Group at the Lawrence Berkeley Laboratory for calculating the thermal and optical properties necessary for heat transfer analyses of fenestration products. This report explains the calculation methods used in WINDOW 4.0 and is meant as a tool for those interested in understanding the procedures contained in WINDOW 4.0. All the calculations are discussed in the International System of units (SI).

%G eng %L LBL-33943 %1Windows and Daylighting Group

%2 LBL-33943