topic Creating a string from a table for Coolprop, programming ? in Mathcad

Creating a string from a table for Coolprop, programming ?

frederico.cms — Tue, 02 May 2023 18:41:52 GMT

Dears,

I´m using with great success the Coolprop wrapper, but one challenging task is to form the "mixture" string.

Air for instance must be written as: "O2[0.21]&N2[0.79]"

When working with complex mixtures, like up to 10 components, my idea was to use a table and extract a "concat" function from the table. All good doing it the hard way:

(...)

Problem: if I add or remove one of the 10 components from the table, maybe for a simpler composition, then the formula for "mixture" would fail.

Solution: maybe write a program? But don´t even know how to start.

Any help would be great.

Best regards,

Fred.

Re: Creating a string from a table for Coolprop, programming ?

Werner_E — Tue, 02 May 2023 18:56:34 GMT

Should be no problem.

But I don't know Coolprop and the syntax that is needed there.

Is it necessary to include names with a mol_frac of zero or could we simply omit them?

Re: Creating a string from a table for Coolprop, programming ?

frederico.cms — Tue, 02 May 2023 19:07:47 GMT

Many thanks!

The string syntax is "component_name[mol%]&component_name[mol%]& ... etc".

The requirements are, the sum must be = 1 and the component name must follow the Coolprop library.

If the mol fraction is zero, both show or omit is ok, For example:

Air: "O2[0.21]&N2[0.79]"

Only oxygen: "O2[1]&N2[0]" or "O2[1]", all ok

In advance, many thanks for the help.

Best regards,

Fred.

Re: Creating a string from a table for Coolprop, programming ?

Werner_E — Tue, 02 May 2023 20:16:35 GMT

Here is a function which creates the string, including zero values

Here is a slight modification so that zero values are omitted

And here is a function which can do both, depending on its third argument

Attached file is in format P9. Maybe someone ( @LucMeekes ?) can convert it to P8 format or lower.

EDIT: There were copy & paste errors in the first version of the functions. Is now fixed.

Re: Creating a string from a table for Coolprop, programming ?

LucMeekes — Tue, 02 May 2023 21:03:16 GMT

Here's the file in Prime6.

Success!

Luc

Re: Creating a string from a table for Coolprop, programming ?

frederico.cms — Wed, 03 May 2023 09:36:52 GMT

Dear Werner,

I can´t thank you enough, it is just perfect and elegant. It also helped me a lot to learn more about programming.

Best regards,

Fred.