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pcdata76
15-05-2006, 09:49 PM
i must write a computer program which calculates the specific enthalpy and specific volume of the refrigerant 134a at a given temperature at saturation and at a given temp. and pressure at superheat region.

i need thermodynamic property formulas for these calculations,how can i find?

I found only the Cp and pressure formulas on DuPont r-134a pdf document(named thermodynamic properties of r134a-SI)

Brian_UK
15-05-2006, 10:41 PM
and good evening to you pcdata76, your first greeting on joining seems to be missing...

US Iceman
15-05-2006, 10:46 PM
Here is something you may wish to consider.

http://www.nist.gov/data/webguide/nist23-7/23dap.htm

and,

http://www.nist.gov/data/nist23.htm

The DLL is already written for this. You just have to write the calls to the DLL from the main program.

This might be faster and more cost effective than developing all of the equation of state routines for the properties desired.

Josip
15-05-2006, 11:54 PM
Hi, pcdata76 and welcome to RE,

try this:

http://users.isp.com//aschoen/refprop.exe

and this:

http://fchart.com/

http://fchart.com/download/ees_manual.exe

http://www.fchart.com/download/ees_demo_setup.exe

maybe you can use it;)

Best regards,

Josip :)

pcdata76
21-05-2006, 08:48 PM
first of all i am sorry to skip the greeting post.
Thanks for all answers,i made a decision to use refprop library on visual basic.It is very easy to use and detailed.

US Iceman
22-05-2006, 02:26 AM
After you get this completed, please let us know how everything worked out for you.

rays17
21-02-2011, 01:44 AM
i must write a computer program which calculates the specific enthalpy and specific volume of the refrigerant 134a at a given temperature at saturation and at a given temp. and pressure at superheat region.

i need thermodynamic property formulas for these calculations,how can i find?

I found only the Cp and pressure formulas on DuPont r-134a pdf document(named thermodynamic properties of r134a-SI)

Hi pcdata76,

I am interested in generating the thermodynamic properties for refrigerant 134a. Could you please suggest me how can I use the refprop library with visual basic?

Thanks