Calculating thermodynamic properties of mixtures, for example R455A

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

Answer 1

[Torsten]

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 ?

[Baqer Alhabeeb]

Thanks for the answer.

No I compare:

136.5667 with 129.44

and 376.2112 with 369.08

[Torsten]

What is Q in the calls ? Is it an indicator for liquid or vapor ?

[Baqer Alhabeeb]

Q is quality

[Torsten]

@Baqer Alhabeeb comment moved here:

I solved the issue by changing the Refrence State in the Refprop ^_^

[Simone Moroni]

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