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braamvandyk / SteamTables.jl

Julia implementation of steam tables according to IAPWS Industrial Formulation (1997)
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how to calculate x(qualicty) #6

Closed hzgzh closed 5 years ago

hzgzh commented 5 years ago

I am using SteamTable for project,but can't find relate to x(quality) function, could you provide some function relate to quality, like phx ,sat liquid and steam enthalpy and pqh pqs

braamvandyk commented 5 years ago

I'll be happy to do so. Just give me a little time to get around to it.

braamvandyk commented 5 years ago

Right, finally have time to get to this. Now, just to clarify:

Are you looking for utility functions that return the quality, given for example P and h (Quality_Ph) or functions that take the quality as an input, for example SpecificG_Px?

hzgzh commented 5 years ago

right

braamvandyk commented 5 years ago

OK, finally. I added four quality functions. You can get the qualioty with any combination of T/P with h/s. The saturated properties where added from IAPWS SR1-86(1992). This introduced an alternative Psat correlation, of which I needed the derivative. Interestingly, even though there is next to no difference between this Psat and the one I used, the derivatives are different enough to affect the specific enthalpy of the liquid at Tc to a few decimal places. I therefore included both models and call the new one only in the saturated property methods. I'll tag a new version that will close this issue.