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) .
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