Condensation and Moisture on Windows Glass Surfaces

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The combination of outside temperature and inside air condition - relative humidity, and the moisture condensation on inside glass windows are indicated in the charts bellow.

• Condensation on glass surfaces (pdf)

Windows - Overall Heat Transfer Coefficients U

• Single glass window : U = 1.13 (Btu/ft^{2 o}F hr) =  6 (W/m^{2 o}C)
• Double sealed glass window : U = 0.58 (Btu/ft^{2 o}F hr) =  3 (W/m^{2 o}C)

Example - Condensation on Window Surface

With an indoor relative humity of 50% and a single - aprox. 6 (W/m^{2 o}C), 1.13 (Btu/ft^{2 o}F hr) - condensation will occur at 6^oC (43^oF) and below. 

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