hfile = c_char_p(b"REFPROP.txt") herr = c_char_p(b" ") ncomp = c_int(1) icomp = (c_int * 1)(1) # R134a index x = (c_double * 1)(1.0) RP.SETUPdll(hfile, herr) RP.SETREFdll(icomp, x, herr) # Set reference state
Before REFPROP, engineers often used "best guesses" or simplified equations like the Martin-Hou model nist refprop 9
✅ Install in short path (e.g., C:\REFPROP ). ✅ Verify license file exists. ✅ Select correct units before calculation. ✅ For mixtures, always check bubble/dew points. ✅ Use Setup + Info to confirm EOS being used. ✅ For coding, use 32-bit environment and test with INFOdll . hfile = c_char_p(b"REFPROP
This is the primary model for most pure fluids, allowing for the computation of all equilibrium properties. nist refprop 9