Test for Modeling Windows in DOE 2.1E for Comparing the Window Library with the Shading Coefficient Method for a Single-Family Residence in Texas

Abstract

This study examines the difference of the window simulation test between the Shading Coefficient (SC) and the Window Library (WL) Methods on DOE 2.1E of the 2000 IECC (International Energy Conservation Code) for single-family residences in Texas. The window simulation tests are performed using single-pane, double-pane, and low-e glass on two standard DOE 2.1E single-family house models: 1) the model which has the R-value for wall, roof and floor according to 2000 IECC (Quick Wall), and 2) the model which has the real wood frame wall and has the same R-value as the first one (Thermal Wall).

The analysis showed different results according to the types of the glass, simulation method (Shading Coefficient or Window Library), and types of wall (quick wall and thermal wall). The saving of daily peak heating (kBtu/day) from single-pane to low-e glass on thermal mass and quick wall shows the most variation.