using 3M HFE 7100 in Coolprop, Excel

[jonas.t...@hotmail.com]

Hello,

I am building a very simple Excel model, using CoolpProp, of an ORC cycle in steady state using the refrigerant 3M HFE 7100.

 

With SES36 for example the Excel model runs fine, but with INCOMP::HFE, some problems occur.

The relations between properties intergated in Coolprop seem to be more limited for HFE than for SES36.

More specifically, it is not possible to extract the enthalpy as a function of temperature at Quality  1, since it is an incompressible fluid.

 

How can I construct the saturation curve in a temperature-entropy or a pressure-enthalpy diagram for HFE,

without using

    PropsSI("H";"P";...;"Q";1;"INCOMP::HFE")/1000

 

I found this relationship for vapour pressure of HFE (http://multimedia.3m.com/mws/media/199818O/3mtm-novectm-7100-engineered-fluid.pdf):

    ln P = 22.415 - 3641.9 [1/(t+273)]

    and knowing the saturation pressure at each temperature, I could use

        PropsSI("H";"P";...;"Q";0;"INCOMP::HFE")/1000 for saturated liquid line

        PropsSI("H";"P";...;"T";...;"INCOMP::HFE")/1000 for saturated vapour line

    However, the saturated liquid and saturated vapour line combined do not give the expected results.

 

What would be a correct way to construct the saturation curve for HFE?

Thanks!

[Ian Bell]

Simply put, an incompressible fluid cannot be used to model an ORC as fundamentally you need compressible fluid properties to do so.  There are currently no published equation of state for any of the HFE, and thus, it's not possible.  

My colleagues are working on this task, but it is not yet complete, nor clear when it will be complete.

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