Vaisala PTU300 Guía de usuario Pagina 206

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User's Guide _______________________________________________________________________
204 __________________________________________________________________ M210796EN-G
Mixing ratio:
w
w
Pp
P
x
-
99.621 ×=
(2)
Absolute humidity:
T
P
a
w
= 68.216
(3)
Enthalpy:
xxTh ++= 5.2)00189.001.1()15.273(
(4)
The water vapor saturation pressure P
ws
is calculated by using two
equations (5 and 6):
=
=Θ
3
oi
i
i
TCT
(5)
where:
T
=
temperature in K
C
i
=
coefficients
C
0
=
0.4931358
C
1
=
-0.46094296 * 10
-2
C
2
=
0.13746454 * 10
-4
C
3
=
-0.12743214 * 10
-7
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