
USER'S GUIDE____________________________________________________________________
154 _________________________________________________________________ M210762EN-D
Absolute humidity:
P
a
w
68.216
(3)
Enthalpy:
h
5.2)00189.001.1()15.273(
(4)
The water vapor saturation pressure P
ws
is calculated by using two
equations (5 and 6):
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
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
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