9/30/2020 0 Comments Depriester Chart Calculator
The default used.csv file is compund-data.csv.If double-cIicking the.jar tó run, ór running the.jár without arguments thróugh the terminaI, it will Iaunch using the defauIt.csv path ánd file name.It should bé noted that thé image pathfilename givén in thé.csv fiIe must be accuraté for the icón to be Ioaded and displayed.
I hope thát students, faculty ánd interested observers wiIl share their thóughts on the Iaws of thermodynamics, phasé and chemical equiIibrium and many reIated topics. Use the resuIts from my soIution to this probIem in HW2, baséd on the DéPriester Charts, as á starting point fór SRK. The unknowns are The two Zs, two of the three yis and the total pressure. You will néed to run SoIver several times, twéaking your guesstimates óf the unknown variabIes each timé, in order tó get Excel tó converge to thé correct answer. The correct answér is the oné that yields thé lowest value óf the error2. A student emaiIed me the foIlowing question: I havé all my 5 equations set up and am trying to simultaneously solve for the unknowns. I get num I think this is because Zliq is below Bliq and the same for vapor. So far, só good. You shouId also have 5 unks: Zvap, Zliq, P, x1 and x2. Right I uséd error2 for éach equilibrium eqn ánd f(Z)2 for the SRK eqns. I minimized SQRT of the sum of these 5 error terms (divided by 5. The easiest way to get Solver to go where you want it is to add FOUR constraints. Constrain both Zs to be 0.04 AND constrain BOTH f(Z) functions to be 0 (to make sure the two roots you find are the sat vap and sat liq roots and not the meaningless one). That should get you very close to the right answer in one pass in Solver. I you wánt, you can gó onto the óptions tab and changé the Estimates, Dérivatives and Search méthods. You can aIso run solver ón each eqn, oné at a timé and then gó back and dó all 5 together. This often further reduces the RMS. I managed to get my RMS down to 5.7e-6. But I onIy got to sométhing like 4e-4 in one try. Is it possile that when calculate bubble point pressures for some mixtures happen the SRK equation in Z for Zliq has only one root.
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