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All, I am trying to write a user defined function for Cp and enthalpy, but I found the documentation a little confusing. the enthalpy and Cp data i have is obtained from RefProp (NIST Reference Fluid Properties database) and attached to this post. from heat transfer/Thermodynamics equations: deltaH = Cp(T) * deltaT. But, Acusolve's documentation states that for a user defined function, both enthalpy and Cp must be provided: "acuSolve has no way of calculating the specific heat from the enthalpy, so both must be supplied by the user defined function" - from the Command Reference Manual. from the file I attached, a Cp and H are provided at a given temperature. However, I do not know if I should just provide those values to Acusolve, or is there a relationship that i'm missing? I want to stay away from the phase change and address the latent heat issue later. For now, i want to focus on either all liquid or vapor analysis. I come from a structural background, and my CFD skills are a little rusty. So far, I've been able to write user defined functions for density, viscosity, and conductivity, which are working. I have also been staying away from the phase change temperature, so the problems i've been running stay in the liquid phase. ultimately, I would like to address the phase change, but that is another problem for another day. hopefully i was clear enough for somebody to help me. methaneEnthalpyCpData.txt