4 replies to this topic

[Alestino]

Hi,
I have a problem with a component of my hysys simulation. I want to cold a stream of pure iodine from 90°C (and for example 110 kPa 10kmol/h) to 50°C, but the heat flow needed is -8576 kJ/h. Naturally I have installed a cooler, but the heat flow is negative. Do you know why? where is the problem?
I'm using the NRTL equation as fluid pack.
However, I have noticed that in the stream the heat capacity is absent. Could that be the problem? and how can I modify that?
Thank you...

[Zauberberg]

Why would you need Hysys for such a simple calculation? All that you have to do is to obtain thermodynamical properties of Iodine (pick any resource you want) and the calculation is straightforward.

[Alestino]

You are right, but it was only an example. I have different components in my simulation and I have noticed that a stream with high iodine concentration has that strange behaviour. This problem happen every time that a stream has high iodine concentration, for this reason probably I need to modify iodine property or fluid pack property. I don't know...

Thank you for the reply...

Edited by Alestino, 31 March 2010 - 06:29 AM.

[Zauberberg]

Perhaps I am wrong, but NRTL property package does not work with Iodine in Hysys.
I don't know what are the other components in your system, maybe you can try to use different thermo.

[Alestino]

My component list is:
HI
I2
H2O
H2SO4
SO3
SO2
O2
H2
...probably General-NRTL doesn't work with iodine (Excuse me, I'm using General NRTL, not NRTL as I told you previously), but I didn't receive any warning during the choose of fluid pack...

Edited by Alestino, 31 March 2010 - 07:58 AM.