User's Guide ______________________________________________________________________
184 ______________________________________________________________ M210796EN-C
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):
∑
=
−
=
Θ
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
∑
−
=
Θ
+
Θ
=
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
Содержание PTU300
Страница 1: ...USER S GUIDE Vaisala Combined Pressure Humidity and Temperature Transmitter PTU300 M210796EN C...
Страница 189: ......
Страница 190: ...www vaisala com...
