Dew point temperature calculation - AWS810

AWS810 System Description
Document code
M212417EN
Revision
H
ft:locale
en-US
Product
AWS810
Document type
Technical description

The dew point component calculates the temperature where dew begins to form from moist air. This calculation is based on air temperature and relative humidity.

Dew point temperature (td) is calculated with the following WMO (Annex 4.B) formulas:

t d = 243.12 ⋅ ln ( e ` 6.112 ⋅ f ( p ) ) ⁡ 17.62 − ln ⁡ ( e ` 6.112 ⋅ f ( p ) )

and

U = 100 ⋅ e ` w ( p , t d ) e ` w ( p , t )

which give:

t d = 243.12 ⋅ ln [ ( U ⋅ exp ⁡ [ ( 17.62 ⋅ t ) / ( 243.12 + t ) ] ) / 100 ] 17.62 − ln [ ( U ⋅ exp ⁡ [ ( 17.62 ⋅ t ) / ( 243.12 + t ) ] ) / 100 ]
Inputs for dew point calculation
Input Variable
Air temperature (T) TAAVG1M (average 1‑minute temperature)
Relative humidity (U) RHAVG1M (average 1‑minute relative humidity)