Uncertainty Assessment of Equations of State with Application to an Organic Rankine Cycle

Jerome Frutiger, Ian Bell, John P. O’Connell, Kenneth Kroenlein, Jens Abildskov, Gürkan Sin

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Abstract

Evaluations of equations of state (EoS) with application to process systems should include uncertainty analysis. A generic method is presented for determining such uncertainties from both the mathematical formand the data for obtaining EoS parameter values. The method is implemented for the Soave–Redlich–Kwong (SRK), the Peng-Robinson (PR) cubic EoS, and the perturbed-chain statistical associating fluid theory (PCSAFT) EoS, as applied to an organic Rankine cycle (ORC) power system to recover heat from the exhaust gas of a marine diesel engine with cyclopentane as the working fluid. Uncertainties of the EoS input parameters, including their corresponding correlation structure, are quantified from the data using a bootstrap method. A Monte Carlo procedure propagates parameter input uncertainties onto the process output. Regressions have been made of the three cubic EoS parameters from both critical point matching and vapor pressure and density data, as used for the three PC SAFT parameters. ORC power uncertainties of 2-5 % are found for all models from the larger data sets. Mean power values for the cubic EoS are similarfor both parameter regressions. The mean power from the PC-SAFT EoS is less than for the cubic EoS, withno overlap of the uncertainty distributions.
Original languageEnglish
Title of host publicationProceedings of ECOS 2017: 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Number of pages12
Publication date2017
Publication statusPublished - 2017
Event30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - The Conrad Prebys Aztec Student Union, San Diego State University 6075 Aztec Cir Dr, San Diego, United States
Duration: 2 Jul 20176 Jul 2017
Conference number: 30
http://www.ecosconference.org/

Conference

Conference30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Number30
LocationThe Conrad Prebys Aztec Student Union, San Diego State University 6075 Aztec Cir Dr
CountryUnited States
CitySan Diego
Period02/07/201706/07/2017
Internet address

Keywords

  • Uncertainty analysis
  • Parameter correlation
  • Cubic EoS
  • PC-SAFT
  • Organic Rankine cycle

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