Does anyone have a function block or method to calculate density of water given a presssure and temperature? The STM function block is only valid for superheated and saturated steam, not liquid water.
Water density in the temperatures 0°C - 100°C
Temperature oC
Density g/cm3
0
0,99984
20
0,99820
1
0,99990
2
0,99994
22
0,99778
3
0,99996
4
0,999973
24
0,99730
5
6
26
0,99679
7
8
0,99985
28
0,99624
9
0,99978
10
0,99970
30
0,99565
11
0,99960
35
0,99404
12
0,99950
40
0,99222
13
0,99938
45
0,99022
14
0,99924
50
0,98805
15
0,99910
60
0,98322
16
0,99894
70
0,97779
17
0,99877
80
0,97181
18
0,99860
90
0,96532
19
0,99841
100
0,95836
Niklas Flykt
Klinkmann Oy
Key Account Manager safety products
nikfly@gmail.com
In reply to Niklas Flykt:
You have to study the gas laws,
en.wikipedia.org/.../Gay-Lussac%27s_law
en.wikipedia.org/.../Avogadro%27s_law
en.wikipedia.org/.../Charles%27s_law
en.wikipedia.org/.../Boyle%27s_law
en.wikipedia.org/.../Water_%28molecule%29
These laws would be useful if I needed equations relating to gases. My original request is for a function block for water. I have used Rockwell PPax and they have a function block using Steam tables to determine properties for conditions including water phase, saturated steam and superheated steam. DeltaV has a PStm function block but this does not provide values for liquid phases. My nominal operating conditions will be 80 deg C and 1 Mpa, but can vary any where up to 1.2Mpa and above ambient temperature.
In reply to ktyang:
"These laws would be useful if I needed equations relating to gases."some of these laws also apply to liquids.
Could you give some more information about the process you want to measure.
The weight(mass) of the water stays the same, only the volume changes when the temperature changes.
If you use a PD measurement then you will get the correction automaticly ?
If you use height measurement then it´s and other thing..