Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The Simple Glazing model uses a much more complex calculation to derive the window U-Value then Rw = 1/U - Ri - Re. It has to convert the U/SHGC/VT summary metrics into detailed window parameters representing an equivalent, feasible, single-layer window, so the derived summary metrics tend not to match inputs. The Simple Window documentation provides the details of the calculation.
