I'm trying to back up some enthalpy calculations done in solidworks and I'm using a program called RefProp. I'm currently using air as a fluid, and when I put in the same Temperature and Pressure I get a different enthalpy number (see below). I think this has to do with Solidworks measuring the total enthalpy (which includes velocity and turbulent energy), but even when I take this into account the number is still different. I think this additional difference is due to the different reference state used by solidworks and refprop. There is a setting in RefProp for a new reference state, but none of the pre-defined ones work and I don't know which custom settings to use.

Does anybody else use this program and have you figured out which reference state to use to get the values to match up?

Thanks!