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Post by futurmomo twms self service login futurmomo Hello All, I have a project in thermodynamics that I must go for May 28 The project involves the study of a fluid with the Peng-Robinson equation: twms self service login a = b = 0.45724 0.07780 (T) = [1+ (0.37464 twms self service login + 1.54223 -0.26992 2) (1-)] 2 I put K = 0.37464 + 1.54223 twms self service login -0.26992 2 T c, P c, V c: temperature (K), pressure (Pa) and spcifique volume twms self service login (m 3 / mol) at the critical point. : Acentric factor. The equation in cubic form and may s'crire: Z 3 - (1-B) Z 2 + (A-3B 2 -2B) Z- (AB-B 2 -B 3) with A and B = 0.45724 = 0.07780, respectively the temperature and with reduced pressure. It must first caluler the saturation vapor pressure thanks to the following relationship: psat = exp (A + B / TC.ln (T) + DT E), Pa Coefficients are for water: A = 73,649 B = C = -7258.2 4.1653 -7.3037 D = 10 -6 E = 2 Then I have to calculate the volume of the liquid spcifique: vl = A = B = 5459 March 10 0.30542 C (= Tc) = 647.13 D = 0081 of the I dduis Volume spcifique gas (or vapor) with the following equation: v = gas M = 0.018kg / mol for water. Now I rsouds equation of the third degree to find thanks to the Z dichotomy Methodius Methodius couples the Newton-Raphson. I dduis V: V = Z * R * T / P with P = 101325 Pa, R = 8.3144 J / mol.K I do not know what it is V. I T varies from 273 K and 643 K for each expression. twms self service login The results are rpertoris below: T Psat VSPELIQ VSPEGAZ ZV 273 603.4862801 0.0009994738845 0.208955427 0.9803497199 0.02196129663 283 1215.115462 0.001001962749 0.1075789491 0.9820737493 0.02280577524 293 2317.62099 0.001004521677 0.05839606912 0.9836008286 0.02364834802 303 4211.466867 twms self service login 0.00100715469 0.03323285474 0.9849590285 0.02448922807 313 7327.492527 0.001009866164 0.01973092122 0.9861716344 0.0253285977 twms self service login 323 12260.21665 0.001012660875 0.01216922125 0.987258092 0.0261666139 333 19802.41643 twms self service login 0.001015544048 0.007767557082 0.988234741 0.02700341262 343 30979.42546 0.001018521415 0.005114217219 0.9891153903 0.0278391122 353 47081.62293 twms self service login 0.001021599282 0.00346323283 0.9899117721 0.02867381614 363 69693.76325 0.001024784612 0.002405864248 0.9906339047 0.02950761543 373 100720.0824 0.001028085113 0.001710610638 0.9912903823 0.03034059031 383