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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 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) .
Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more.
Weight of float glass.
Overall heat transfer loss from buildings - transmission, ventilation and infiltration.
Walls or heat exchangers - calculate overall heat transfer coefficients.
Relative solar heat transmission through different types of glass windows
Solar heat gain through windows with roller shades, vertical blinds and Venetian blinds
Heat loss through common building elements due to transmission, R-values and U-values - imperial and SI units.
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