dew point   

dew point



Calculation of Dew point
  1. Enter air temperature.
  2. Enter relative humidity.
When humid air reaches the dew point condensation begins. Saturation pressure and partial pressure of the steam in the humid air equal when temperature equals the dew point. Mirrors in the bathroom go blind once their surface temperature is below the dew point. Pipes carrying cold water show condensate on their surface when surface temperature is below the dew point of the ambient air. Corrosion is the consequence. Mould formation on house walls is promoted by temperatures below the dew point.

dew point = f (Temperature, relative humidity)
10% 25% 50% 75% 100%
10°C <1°C <1°C <1°C 5.8°C 10°C
20°C <1°C <1°C 9.3°C 15.4°C 20°C
30°C <1°C 7.8°C 18.4°C 25.1°C 30°C
40°C 2.6°C 16.2°C 27.6°C 34.7°C 40°C


Means of Calculation Condensation at outer pipewall
 
Ambient temperature ºC
relative humidity %
 




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