User's Guide _______________________________________________________________________
174 ______________________________________________________________________________
Mixing ratio:
w
w
P
p
P
x
-
99
.
621
(2)
Absolute humidity:
T
P
a
w
68
.
216
(3)
Enthalpy:
x
x
T
h
5
.
2
)
00189
.
0
01
.
1
(
)
15
.
273
(
(4)
The water vapor saturation pressure
P
ws
is calculated by using two
equations (5 and 6):
3
o
i
i
i
T
C
T
(5)
where:
T
=
temperature in K
Ci
=
coefficients
C0
=
0.4931358
C1
=
-0.46094296 * 10-2
C2
=
0.13746454 * 10-4
C3
=
-0.12743214 * 10-7
3
1
4
ln
ln
i
i
i
ws
b
b
P
(6)
where:
bi
=
coefficients
b-1
=
-0.58002206 * 104
b0
=
0.13914993 * 101
