# Regarding error in Transient simulation

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March 27, 2014, 00:48
Regarding error in Transient simulation
#1
Member

Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 13
Hello all,
I am performing transient simulation of a rectangular Natural Circulation loop operating between two temperatures of 299K-339K. I have given the operating temperature as average of the above mentioned temperature and o/p press is 90 bar. Fluid is CO2.
After the simulation is run for a few iterations, it shows an error(see the attachment)-->
"Primitive Error at Node 0: REFPROP_error (203) from function: tprho (density)

Primitive Error at Node 1: REFPROP_error (203) from function: tprho (density)

[TPRHO error 203] vapor iteration has not converged for T = 299.42 K, P = 7.1370 MPa, rho (last guess) = 6.6129 mol/L, x (mol frac) = 1.00000

[TPRHO error 203] vapor iteration has not converged for T = 299.29 K, P = 7.1370 MPa, rho (last guess) = 6.5994 mol/L, x (mol frac) = 1.00000

WHAT might be causing this?
Any help is appreciated. Thanks
Attached Images
 Sim.jpg (33.4 KB, 32 views)

 December 19, 2015, 02:46 #2 New Member   Hossein Join Date: Apr 2013 Posts: 20 Rep Power: 13 Anybody here Hello Does anybody know the solution?

 October 26, 2016, 01:32 #3 New Member   Senthilkumar Join Date: Oct 2012 Posts: 29 Rep Power: 13 I am surprised this question is still not answered. If anybody have solution to this problem, it will be helpful. I am simulating a supersonic flow of supercritical CO2 through convergent divergent nozzle. Inlet condition Inlet : Pressure Inlet ;P0 = 95.7 bar T0 = 315K Real gas model : NIST

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