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# Windows - Inside Condensation

The influence of

• outside temperature
• inside air relative humidity (for inside air dry bulb temperature at 65 o F (18.3 o C))

on the condensation on inside surface of glass windows are indicated in the charts below:

### 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 temperature on a window surface

• indoor relative humidity of 50%
• window with single glass with U-value aprox. 6 (W/m 2 o C), 1.13 (Btu/ft 2 o F hr)

Based on the diagram above condensation on the inside of the glass starts when the outside air temperature is 6 o C (43 o F) .

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### Solar Heat Transmission and Type of Glass

Relative solar heat transmission through different types of glass windows

### Solar Heat Transmission through Windows

Solar heat gain through windows with roller shades, vertical blinds and Venetian blinds

### Transmission Heat Loss through Building Elements

Heat loss through common building elements due to transmission, R-values and U-values - imperial and SI units.

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