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One of the important advantages of ordinary double glazing in comparison with single glazing is the avoidance of condensation at the inner surface during normal household activities. The reason being the higher internal surface temperature when using double glazing. However, highly insulating glazings will have lower external surface temperatures due to the good thermal insulation. During periods of clear sky during the night the outside surface temperature may drop below the external air temperature. This may cause condensation at the outer surface if the outdoor relative humidity is sufficiently high. This phenomenon is rather frequently observed on Improved glazing applications in a country as Belgium. The following issues are described in the paper:
- theoretical description of the process with emphasis on the sky radiation;
- theoretical example applied to single glazing, ordinary double glazing and improved insulating glazing;
- results of monitoring on the PASSYS Test Cells;
- guidelines for future product development.