Condensation and Moisture on Windows Glass Surfaces

Ouside temperature, inside air condition and condensation on inside glass windows

The combination of outside temperature and inside air condition - relative humidity, and the moisture condensation on inside 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 on Window Surface

With an indoor relative humity of 50% and a single - aprox. 6 (W/m2 oC), 1.13 (Btu/ft2 oF hr) - condensation will occur at 6oC (43oF) and below. 

Related Topics

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

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