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Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case

Year 2018, , 38 - 53, 01.03.2018
https://doi.org/10.5541/ijot.372148

Abstract

The predictive error in vapor pressure of
limited-data Wagner constants relative to that of entire-curve constants is
studied for eleven data intervals.  Good
precision is assumed for data inputs, four digits in the mantissa of Ln Pv,r and five digits for Tr.  An algebraic solution for the
fully-determined case based on only four data points is used to estimate Wagner
constants.  Seventy-two species are used
to assess the impact of the location of the two interior points and the
location and width of the limited-data interval upon the error in predicted Pv,r due to data imprecision. 
Hydrogen, helium, R152a, and water are used to assess error due to
Wagner imperfection and compare predictive capability of the algebraic fully-determined
and regressed over-determined approaches. 
The results indicate
that limited VLE data of good precision from reduced temperature intervals with
a width ≥ 0.1 and a lower bound ≤ 0.6 can generally provide reasonable VLE
predictions over the entire two-phase curve for pure substances,
with average error of approximately 1%.  It is shown that the algebraic,
fully-determined solution presented
is
a viable tool for investigating the extensibility of limited-data Wagner
constants.

References

  • Dr. Ahmed Bellagi U. R. Thermique et Thermodynamique des Procedes Industriels, Ecole Nationale d'ingenieurs de Monastir (E.N.I.M.), Avenue Ibn El Jazzar, 5060 Monastir, Tunisia E-mail address: a.bellagi@enim.rnu.tn
  • Dr. Santiago Velasco Departamento de Fisica Aplicada, Universidad de Salamanca, E-37008 Salamanca, Spain E-mail: santi@usal.es
  • Dr. Joachim Gross Institute of Thermodynamics and Thermal Process Engineering, University of Stuttgart, Pfaffenwaldring 9, D-70569 Stuttgart, Germany E-mail: gross@itt.uni-stuttgart.de
Year 2018, , 38 - 53, 01.03.2018
https://doi.org/10.5541/ijot.372148

Abstract

References

  • Dr. Ahmed Bellagi U. R. Thermique et Thermodynamique des Procedes Industriels, Ecole Nationale d'ingenieurs de Monastir (E.N.I.M.), Avenue Ibn El Jazzar, 5060 Monastir, Tunisia E-mail address: a.bellagi@enim.rnu.tn
  • Dr. Santiago Velasco Departamento de Fisica Aplicada, Universidad de Salamanca, E-37008 Salamanca, Spain E-mail: santi@usal.es
  • Dr. Joachim Gross Institute of Thermodynamics and Thermal Process Engineering, University of Stuttgart, Pfaffenwaldring 9, D-70569 Stuttgart, Germany E-mail: gross@itt.uni-stuttgart.de
There are 3 citations in total.

Details

Primary Language English
Subjects Engineering
Journal Section Regular Original Research Article
Authors

Todd Nichols

Vivek Utgikar

Publication Date March 1, 2018
Published in Issue Year 2018

Cite

APA Nichols, T., & Utgikar, V. (2018). Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case. International Journal of Thermodynamics, 21(1), 38-53. https://doi.org/10.5541/ijot.372148
AMA Nichols T, Utgikar V. Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case. International Journal of Thermodynamics. March 2018;21(1):38-53. doi:10.5541/ijot.372148
Chicago Nichols, Todd, and Vivek Utgikar. “Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case”. International Journal of Thermodynamics 21, no. 1 (March 2018): 38-53. https://doi.org/10.5541/ijot.372148.
EndNote Nichols T, Utgikar V (March 1, 2018) Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case. International Journal of Thermodynamics 21 1 38–53.
IEEE T. Nichols and V. Utgikar, “Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case”, International Journal of Thermodynamics, vol. 21, no. 1, pp. 38–53, 2018, doi: 10.5541/ijot.372148.
ISNAD Nichols, Todd - Utgikar, Vivek. “Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case”. International Journal of Thermodynamics 21/1 (March 2018), 38-53. https://doi.org/10.5541/ijot.372148.
JAMA Nichols T, Utgikar V. Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case. International Journal of Thermodynamics. 2018;21:38–53.
MLA Nichols, Todd and Vivek Utgikar. “Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case”. International Journal of Thermodynamics, vol. 21, no. 1, 2018, pp. 38-53, doi:10.5541/ijot.372148.
Vancouver Nichols T, Utgikar V. Wagner Equation Predicting Entire Curve for Pure Fluids from Limited VLE Data: Error Dependency Upon Data Interval & Fully-Determined Case. International Journal of Thermodynamics. 2018;21(1):38-53.