Fixes Units file to work around Prime 10 bug

[henningjp]

Single change to the RefProp_Units.mcdx file (binary) to workaround a bug in Mathcad Prime 10.

Changes include:

Per #605 , Mathcad Prime 10 introduced a bug that affects 3-parameter functions that use the derivative operator. This was used in a calculation of the thermal expansion coefficient. The error makes the entire file unusable by users as-is.

There's a simple workaround that has been employed in this version of the file. Offending equation:

Simple re-arrangement in a Mathcad "program" fixes the problem.

Testing

• Unfortunately, this is a binary file and cannot be reviewed without opening in Mathcad Prime.
• File has been tested successfully in Mathcad Prime 9.0 and 10.0 for proper behavior.

Additional Information

• The Mathcad Prime 10 bug is known to PTC and will be corrected, but this change allows the application of units and use of the generic REFPROP() function now.
• This file will not be impacted when the bug is fixed by PTC as the corrected function works in earlier versions of Mathcad Prime.

Related Issues

Closes #605

[henningjp]

@ianhbell - Sorry, this is a one-time update to a Mathcad binary worksheet. You'll just have to trust us on this one. It is ready to merge.