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A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started: [2]
Energy-efficient houses in cold climates often feature triple-glazed windows with a U-value between 0.19 and 0.26. In moderate and hot climates, quality double-glazed windows with a U-value of about 0.30 are generally a more cost-competitive and effective choice. [8]
HERS can produce a list of recommended improvements based on some life cycle's effective cost analysis. These recommendations may be pertaining to any of the inefficient components of a building i.e. insulation layer in the composite wall of building, air conditioning equipment, water heating unit, double-glazed windows, etc.
R-values expressed in I-P units are approximately 5.68 times as large as R-values expressed in SI units. [14] For example, a window that is R-2 in the I-P system is about RSI 0.35, since 2/5.68 ≈ 0.35. In countries where the SI system is generally in use, the R-values will also normally be given in SI units.
The walls are made of 25 cm thick bricks without insulation except for the cellar. The windows and glassdoors are standard double glazed with an intermediate layer of air We have used EnergyPlus for simulating the house model. For building our simulation framework we have used the software tool Building Controls Virtual Test Bed (BCVTB).
5.1 For heat gain through walls, doors, roofs, and windows (only window conduction) 5.2 For heat gains due to people, equipment (hooded and unhooded), and lighting 5.3 For solar heat gains through windows and glazed surfaces
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