Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Convert Nm3 to Std Ideal Liq Vol

Convert Nm3 to Std Ideal Liq Vol

Convert Nm3 to Std Ideal Liq Vol

I would like to convert a 500 Nm3/h HF flow to std m3/h using Hysys.

Can anyone tell me how to enter this in a Hysys stream?

I thought about filling in a molar flow under "Conditions" and adjust untill I find the right value under "Properties" but Nm3/h is not listed there:

[img http://nl.tinypic.com/r/6qje45/9]

Thanks for your help.


RE: Convert Nm3 to Std Ideal Liq Vol

the question is not clear, std. ideal liq. volumes or std. volumes ?
I assume you wish to convert from (gas) normal conditions to std, correct ?
why do you think to use a simulator for a problem which can be easily solved by hand (or in Excel) with a simple conversion factor (normal volumes = R*T(0 C)/P(atm) to std volume = R*T(15.5 C)/P(atm)) ?
If (for example with hydrocarbons, above critical point) you wish to add compressibility then use the software to calculate volumes, I use Prode Properties but any software is good for that,
take care that definitions for normal and std. conditions may change in different countries.
Of course, you can apply a similar procedure for liquids (calculating volumes at different operating conditions).
Finally, to estimate the amount of condensate (liquid phase) simply solve a flash operation at some specified conditions.

RE: Convert Nm3 to Std Ideal Liq Vol

Hi Marc,

I would like to convert gas flow (Nm3/h) to std. ideal liq. volumes (m3/h)
I think 20degC is used as standard conditions here.

RE: Convert Nm3 to Std Ideal Liq Vol

I am not sure to understand the point,
for mixtures you cannot convert liquid to gas (evaporation) or gas to liquid (condensation) without setting different operating conditions,
see my previous post, for example given the equilibrium temperature, 20 C according your last post, you can solve a flash operation (bubble point pressure) to estimate the (minimum) pressure where you have only liquid, then calculate liquid volume, note that light components can require very high pressures to condensate,
anyway, I solve similar problems in Excel (with Prode Properties) but of course any software should give similar options.

RE: Convert Nm3 to Std Ideal Liq Vol

The documentation that may have accompanied your copy of the HYSYS software from the vendor has a detailed discussion in one of its chapter regarding the various types of volumes and volumetric flow rates used by HYSYS in ite simulation.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close