Energy performance for interpane shadings

Figure 9.6.11 shows g-values for a south-oriented window with interpane shadings in a cold climate. The triple-glazed window consists of a double-glazed sealed unit with a low-e coating (4 per cent) and argon, and, on the outside, an 84 mm air gap (including sunshade) and a single glazing with a low-e coating (16 per cent). Such a triple-glazed unit has a centre-of-glass U-value of 0.79 W/m2K. The g-value for the bare window is somewhat higher (38 per cent to 46 per cent) than for the window used for the external sunshades.

Most of the interpane shadings in Figure 9.6.11 show a similar performance: gsystem between 15 per cent and 20 per cent. Two white products - closed (= 80°) white Venetian blinds and a white screen with a high reflectance - have a better performance. The total transmittance, gsystem, is approximately 7 per cent to 10 per cent for these products. It is thus essential that interpane products have a high reflectance. When included in the outermost air gap (as shown here), they obtain quite high shading performance, even better than some of the exterior ones.

Note: Different shadings are included in the outermost air gap; south orientation in a cold Stockholm climate. Source: Maria Wall

Figure 9.6.11 Monthly mean g-values for the combination of a triple-glazed window and inter-pane shading: Double-glazed sealed unit with argon (12 mm) and a low-e coating (4 per cent) plus an air gap (84 mm) and clear glass on the outside with a low-e coating (16 per cent)

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