Steam Tables

[Dia791]

Does anyone have Steam Tables (IAPWS-IF97) for Diadem? Or any kind of calculation model for steam/water properties?

Simple example: you have the pressure inside the vessel (as a channel) and want to know, which saturation temperature corresponds to it. The pressure channel exists, the temperature channel should be calculated.

We have an add-on for EXCEL, but I'd like to work direct in Diadem, without export/import of the data for every calculation.

[Misic@NI]

Hi Dia791,

I found a saturation table, which shows the saturation quantity over water (from -100 °C to 100 °C) and ice (from -100 °C to 0 °C)

Temperature in °C	Saturation Quantity (water) in g/m³	Saturation Quantity (ice) in g/m³
-100	4,5436 ·	1,7465 ·
-95	1,1432 ·	4,5752 ·
-90	2,7247 ·	1,1373 ·
-85	6,1778 ·	2,6939 ·
-80	1,3378 ·	6,1013 ·
-75	2,7765 ·	1,3260 ·
-70	5,5406 ·	2,7735 ·
-65	0,010661	0,005598
-60	0,019832	0,010930
-55	0,035750	0,020692
-50	0,062584	0,038056
-45	0,10661	0,068124
-40	0,17702	0,11890
-35	0,28700	0,20265
-30	0,45501	0,33776
-25	0,70640	0,55127
-20	1,0753	0,88211
-15	1,6068	1,3854
-10	2,3596	2,1380
-5	3,4086	3,2449
-4	3,6619	3,5205
-3	3,9316	3,8172
-2	4,2187	4,1363
-1	4,5239	4,4794
0	4,84843	4,84795
1	5,19317	-
2	5,55921	-
3	5,94766	-
4	6,35967	-
5	6,79642	-
6	7,25917	-
7	7,74919	-
8	8,26783	-
9	8,81648	-
10	9,39658	-
11	10,0096	-
12	10,6572	-
13	11,3408	-
14	12,0623	-
15	12,8232	-
16	13,6254	-
17	14,4707	-
18	15,3611	-
19	16,2984	-
20	17,2848	-
21	18,3224	-
22	19,4132	-
23	20,5596	-
24	21,7638	-
25	23,0283	-
26	24,3554	-
27	25,7477	-
28	27,2079	-
29	28,7385	-
30	30,3424	-
35	39,5623	-
40	51,0726	-
45	65,3114	-
50	82,7730	-
55	104,011	-
60	129,642	-
65	160,344	-
70	196,863	-
75	240,011	-
80	290,669	-
85	349,782	-
90	418,369	-
95	497,511	-
100	588,359	-

The general formula for calculating the saturation quantity [kg/m³] for water is:

(vapor pressure of water[Pa]) / (461,52[J/kg °C] * temperature[°C])

Formula for vapor pressure of water [hPa]:

6.112[hPa] * exp{ (17,62 * temperature[°C]) / (243,12[°C] + temperature[°C]) }

I hope this helps you implementing a function in DIAdem!

Regards,

Matijas

[Dia791]

Hello Matijas,

thank you for support, but these are even the single values.

The formulas are helpful, they can solve at least a part of the problem.

[Dia791 · Accepted solution]

Meanwhile the issue is cleared.

I could satisfy our IT people of necessity to work with new classes