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# Windows - Inside Condensation

## Water condensation on inside glass windows surfaces vs. outside temperature and inside temperature and humidity.

The influence of

• outside temperature
• inside air relative humidity (for inside air dry bulb temperature at 65 oF (18.3 oC))

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) .

## Related Topics

• ### Heating Systems

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## Related Documents

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Weight of float glass.
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• ### Overall Heat Transfer Coefficients

Walls or heat exchangers - calculate overall heat transfer coefficients.
• ### 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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## Citation

• The Engineering ToolBox (2010). Windows - Inside Condensation. [online] Available at: https://www.engineeringtoolbox.com/condensation-glass-surfaces-d_1580.html [Accessed Day Month Year].

Modify the access date according your visit.

8.21.8

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