I have developed many Add-Ins for Excel, including functions for thermodynamic and transport properties (steam, moist air, natural gas, fuel oil, refrigerants, etc.) and special mathematical functions. These are fast and easy to use. I would be glad to work with you to create ones for your specific needs or give you an example you can modify yourself. These are easy to compile and link for 32-bit or 64-bit versions of MS Office in seconds with a little batch file. I would be glad to help with your research in this way if I can.