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Re: [TRNSYS-users] Thermodynamic property calculation, refrigerants R410a, R407c, R404a and R134a

Dear Mathaeus,

Just remembered something I saw once during a literature survey browsing... 
check the end of this page:
http://www.nist.gov/srd/nist23.htm

"Source code: The FORTRAN subroutines and associated fluid data files are provided for those wishing to access REFPROP calculations from their own applications."

Although I have no experience of implementing those, but maybe you'll find some help there.

Kind regards,
Janne

-------------------------------------------------------------
Janne Paavilainen 
MSc, PhD student
Researcher in Energy and Environmental engineering
-------------------------------------------------------------
Solar Energy Research Center SERC
Dalarna University
SE-781 88 Borlänge
Sweden
-------------------------------------------------------------
tel +46 (0)23 778728
fax +46 (0)23 778701
e-mail: jip@du.se
-------------------------------------------------------------
www.du.se
www.serc.se
www.eses.org
http://solar.uni-kassel.de/solnet/index.htm
-------------------------------------------------------------



-----Original Message-----
From: mathaeus.nierzwicki@solarenergy.ch [mailto:mathaeus.nierzwicki@solarenergy.ch] 
Sent: den 16 oktober 2009 15:19
To: duffy@tess-inc.com; trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] Thermodynamic property calculation, refrigerants R410a, R407c, R404a and R134a

Dear Mr. Duffy,

first of all, thank you for your answer. Indeed, I found information about thermodynamic property calculation of R-11, R-12, R-13, R-14, R-22, R-114A, R-134A, R-500, R-502 and ammonia(R-717) in Type58. Furthermore, I used EES Professional in combination with TRNSYS until I found out that the maximum number of calls between EES and TRNSYS is around 2^16, which might be a WINDOWS, a TRNSYS or an EES problem. Additionally, the communication between EES and WINDOWS is incredibly slow. Due to these reasons I decided to write a new Type for TRNSYS and now, I solved most of the problems (including appropriate psychrometrics calculation). One of the few problems left is the thermodynamic property calculation of the refrigerants R410a, R407c, R404a and R134a. 

I am working on this refrigerant problem for days (reading related papers, calling relevant companies, trying out some calculations etc.) and unfortunately, I am not able to find an equation (-fit) which calculates the properties (e.g. enthalpy(T,P) or enthalpy(T,x)) at least almost as good as EES does it.

If you might help me anyway, I would appreciate it very much.

Thank you once again.

Sincerely yours,

Mathaeus Nierzwicki




Mathaeus Nierzwicki
Forschung / Research
Institut für Solartechnik SPF: Adresse / Website
Hochschule für Technik Rapperswil HSR
Tel. +41 55 222 48 30
Fax +41 55 222 48 44


-----Original Message-----
From: Matt Duffy [mailto:duffy@tess-inc.com] 
Sent: Freitag, 16. Oktober 2009 14:31
To: Nierzwicki Mathaeus Lukas (mathaeus.nierzwicki@solarenergy.ch); trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] Thermodynamic property calculation, refrigerants R410a, R407c, R404a and R134a

Dear Mathaeus,

The following are the available refrigerants for Type58: R-11, R-12, R-13,
R-14, R-22, R-114A, R-134A, R-500, R-502, ammonia (R-717) and steam
(R-718).

I am sure the other properties of the refrigerants that you listed are
available in EES. With EES Professional, you may couple that to your
TRNSYS simulation with Type66.

Best regards,

Matt Duffy



----- Original Message -----
From: "" <mathaeus.nierzwicki@solarenergy.ch>
Sent: Fri, October 16, 2009 1:17
Subject:[TRNSYS-users] Thermodynamic property calculation,refrigerants
R410a, R407c, R404a and R134a


Dear all,

I would like to implement a calculation of thermodynamic properties of the
refrigerants R410a, R407c, R404a and R134a in my type. I already found a
source code
for the calculation of R134a in Type58 - does anyone know, if a
Type/source code for
the calculation of R410a, R407c, R404a exists?

Sincerely,

mathaeus

________________________________
Mathaeus Nierzwicki
Forschung / Research
Institut für Solartechnik SPF:
Adresse<http://www.solarenergy.ch/spf.php?lang=de&amp;fam=44&amp;tab=3> /
Website<http://www.solarenergy.ch/spf.php?lang=de&amp;fam=41&amp;tab=1>
Hochschule für Technik Rapperswil HSR
Tel. +41 55 222 48 30
Fax +41 55 222 48 44
________________________________

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----- End of original message -----


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