Windows - Condensation on Inside Surface

Outside temperature, inside humidity and condensation on inside windows glass surface

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 bellow:

Condensation glass surfaces

Windows - Overall Heat Transfer Coefficients U

  • Single glass window : U = 1.13 (Btu/ft2 oF hr) =  6 (W/m2 oC)
  • Double sealed glass window U = 0.58 (Btu/ft2 oF hr) =  3 (W/m2 oC)

Example - Condensation temperature on a window surface

  • indoor relative humidity of 50%
  • window with single glass with U-value aprox. 6 (W/m2 oC), 1.13 (Btu/ft2 oF hr)

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

Related Topics

  • Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more

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