Vaisala PTU300 Podręcznik Użytkownika Strona 207

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Appendix B _______________________________________________________ Calculation Formulas
VAISALA _______________________________________________________________________ 205
=
Θ+Θ=
3
1
4
lnln
i
i
iws
bbP
(6)
where:
b
i
=
coefficients
b
-1
=
-0.58002206 * 10
4
b
0
=
0.13914993 * 10
1
b
1
=
-0.48640239 * 10
-1
b
2
=
0.41764768 * 10
-4
b
3
=
-0.14452093 * 10
-7
b
4
=
6.5459673
The water vapor pressure is calculated using:
100
ws
w
P
RHP =
(7)
Parts per million by volume is calculated using:
( )
w
w
v
Pp
P
ppm
=
6
10
(8)
Symbols:
T
d
=
dewpoint temperature (°C)
P
w
=
water vapor pressure (hPa)
P
ws
=
water vapor saturation pressure (Pa)
RH
=
relative humidity (%)
x
=
mixing ratio (g/kg)
p
=
atmospheric pressure (hPa)
A
=
absolute humidity (g/m3)
T
=
temperature (K)
h
=
enthalpy (kJ/kg)
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