User guide

User's Guide _______________________________________________________________________
196 __________________________________________________________________ M210566EN-K
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
∑
−=
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