01532nas a2200157   4500008004100000050001400041245003300055210003200088260003400120520105600154100001801210700003001228700002501258700002501283856006601308       1994                        eng d  aLBL-3319200aModeling Windows in DOE 2.1E0 aModeling Windows in DOE 21E  aClearwater Beach, FLc12/19923 a<p>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.</p>1 aReilly, Susan1 aWinkelmann, Frederick, C.1 aArasteh, Dariush, K.1 aCarroll, William, L.  uhttps://facades.lbl.gov/publications/modeling-windows-doe-21e