×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

software or tables of thermal properties for natural gas
2

software or tables of thermal properties for natural gas

software or tables of thermal properties for natural gas

(OP)
I am in need of thermal properties of natural gas at varying temperatures.  They have given the specific gravity of .6, but I would like some direction on where to find software or tables.

Thanks for your help

RE: software or tables of thermal properties for natural gas

mickey-

    Do you want the properties at one temperature or many temperatures?  

    Do you want values for various compositions or just one composition?   Natural gas composition varies.

    Finding data like specific heat capacity for most components of natural gas is easy ( I just looked in a thermodynamics book and curve fits are available for each component).  You then use the mole fractions of the components to find the specific heat capacity of the mixture.   Lower heating value is done in a similar manner.  I use a spreadsheet to do this.

    There is an on-line calculator for pure substances at http://webbook.nist.gov/chemistry/fluid/

    AVL sells software that will calculate many properties of a given natural gas, if  you provide the components of the natural gas.  The software is called METHANE  and it costs about $3,000.   This is good for varying compositions but not good for varying temperatures.

RE: software or tables of thermal properties for natural gas


Mickey:

How accurate do you need to be? Almost all natural gases are at least 90 volume percent methane.  If you don't need any extreme accuracy, you could just use the thermal properties of methane.

As pointed out by j2bprometheus, the NIST website has a calculator where you can obtain the isobaric data by specifying a pressure (say 14.7 psia) and a temperature range (say 50 deg F to 200 deg F) in given increments (say 5 deg F), and obtain a table in HTML format of the gas density, specific heats (Cp and Cv), enthalpy, entropy, and thermal conductivity at each of those temperatures.  

Milton Beychok
(Contact me at www.air-dispersion.com)

RE: software or tables of thermal properties for natural gas

I use an Excel addin to calculate gas mixure properties.  It cost ~$200 and it is based on the Lee Kessler Equation of State.  You probably wouldn't want to design an LNG facility with it but it is very handy for doing routine calculations. You can get it from Moongate Software.

Regards,

Gunnar

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!


Resources