NIST real gas model can not converge

mayanyun · May 6, 2013, 13:30

I am doing a simulation recently. With heat exchange and flow.
If I define the gas material parameters as constant such as density, it can be converged. First I simulate the flow case. Then I do the heat exchange. It is ok. But as the temperature change range is from 40K to 300K.
So I change to NIST real gas model. Then it can not converge.

mayanyun · May 6, 2013, 14:01

Error: REFPROP_error (-51) from function: trnprp (viscosity)
[TRNPRP warning -51] one or more inputs to the thermal conductivity and viscosity correlations are out of range; will use ECS model; temperature > 1.5 x upper limit, T = 5000.0 K, Tmax = 1500.0 K

arun km · March 24, 2014, 00:09

sir
i am doing a simulation of an ejector (vapor jet refrigeration system) with NIST real gas model.I am getting the same result that you have got earlier.Please share the remedy if you solved this problem recently.
Thanks in advance

MalteSe94 · June 29, 2016, 03:44

Has anyone found a solution on this topic already?
I am facing the same problem and am desperate for help.

Kind regards,
Malte

May 6, 2013, 13:30	NIST real gas model can not converge	#1
mayanyun New Member Join Date: May 2013 Posts: 2 Rep Power: 0	I am doing a simulation recently. With heat exchange and flow. If I define the gas material parameters as constant such as density, it can be converged. First I simulate the flow case. Then I do the heat exchange. It is ok. But as the temperature change range is from 40K to 300K. So I change to NIST real gas model. Then it can not converge.

May 6, 2013, 14:01	error message	#2
mayanyun New Member Join Date: May 2013 Posts: 2 Rep Power: 0	Error: REFPROP_error (-51) from function: trnprp (viscosity) [TRNPRP warning -51] one or more inputs to the thermal conductivity and viscosity correlations are out of range; will use ECS model; temperature > 1.5 x upper limit, T = 5000.0 K, Tmax = 1500.0 K

March 24, 2014, 00:09	nist real gas midel R134a	#3
arun km New Member arun km Join Date: Dec 2011 Location: Chennai,India Posts: 3 Rep Power: 14	sir i am doing a simulation of an ejector (vapor jet refrigeration system) with NIST real gas model.I am getting the same result that you have got earlier.Please share the remedy if you solved this problem recently. Thanks in advance

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June 29, 2016, 03:44		#4
MalteSe94 New Member Malte Semmel Join Date: Jun 2016 Posts: 1 Rep Power: 0	Has anyone found a solution on this topic already? I am facing the same problem and am desperate for help. Kind regards, Malte