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Calculating thermodynamic properties of mixtures, for example R455A

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Baqer Alhabeeb
Baqer Alhabeeb 2023-2-9
评论： Simone Moroni 2024-8-8，14:24
Hi,
I got different results between Matlab and refprop, for example:
- Matlab:
HsatL=refpropm('H','P',100,'Q',0,'R455A.mix)/1000; HsatV=136.5667 (kJ/kg)
HsatV=refpropm('H','100',P,'Q',1,'R455A.mix)/1000; HsatL=376.2112 (kJ/kg)
- Refprop:
HsatV (P=100, Q=0)=129.44 (kJ/kg)
HsatL (P=100, Q=1)=369.08 (kJ/kg)
Anyone knows why and how to solve it? By the way, I use version 9.1, and I have same results when I used pure substance.
Thanks

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回答（1 个）

Torsten
Torsten 2023-2-9
移动：Torsten 2023-2-9
So you want to compare
HsatL=refpropm('H','P',100,'Q',0,'R455A.mix)/1000; HsatV=136.5667 (kJ/kg)
with
HsatL (P=100, Q=1)=369.08 (kJ/kg)
and
HsatV=refpropm('H','100',P,'Q',1,'R455A.mix)/1000; HsatL=376.2112 (kJ/kg)
with
HsatV (P=100, Q=0)=129.44 (kJ/kg)
?
But the Q-values are switched, aren't they ?
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Torsten
Torsten 2023-2-9
@Baqer Alhabeeb comment moved here:
I solved the issue by changing the Refrence State in the Refprop ^_^
Simone Moroni
Simone Moroni 2024-8-8，14:24
Hi, thank you. I have the same problem, I want to calculate the saturation curve of CO2-Toluene mixture. How can I change the Reference State in Refprop? Thank you

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