Hydrogenated Veg Oil Plant - Modeling Non-Flashing Stable Liquid without getting TP Flash Error

[ejrojasengineering13]

Hello everyone,

I am trying to verify an oil/oil heat exchanger energy balance that I made in excel (pretty simple item) but I am unable to replicate this energy exchange in DWSIM due to a couple of reasons:

1. When trying to make a user defined compound in DWSIM the functions do not seem to work when inputting coefficients manually into the program even though I already have all of liquid thermal property functions created in excel and working properly...those same functions don't work in DWSIM. I even tried creating an x/y table in excel using my existing functions and then placing the output values (t in kelvin) and trying the regression which works in creating a graph that looks correct to the input data, but then for some reason when you click view compound after inputting the data, some of the graphs are straight lines or single points despite the compound creator creating a workable function. When trying to create a JASON file to then export this new compound into the simulation, the same thing happens. The file is written as though heat capacity or viscosity (usual culprits) are straight lines despite the actual function being an exponential function or a polynomial. This seems like a DWSIM internal problem...very frustrating.

2. Trying to move beyond this, I have tried modeling my veg oil as tripalmitin given the similar high melting point and similar high triglycerides behavior. Even still, adding a heat exchanger produces a TP flash error (vb 2638) despite this liquid not flashing. The pressure is high for this process because the oil is being pumped through the heat exchanger, but for some reason DWSIM does not recognize that this liquid remains a liquid (never really flashes) even at high temp and pressure even when selection liquid when forcing stream phase. Additionally, the heat transfer calculation is completely incorrect with outlet temperatures of the heat exchanger being much larger than the heat contained in the entry streams...how is this possible? I guess the laws of thermodynamics don't apply in simulation if the components flash lol
   Any help on this would be very much welcome. Thank you