%0 Journal Article %1 Enick1998 %A Enick, Robert M. %A Donahey, Glenn P. %A Holsinger, Mike %D 1998 %J Industrial & Engineering Chemistry Research %K ammonia+water 1998 Kalina equation-of-state power-cycle analysis %N 5 %P 1644-1650 %R 10.1021/ie970638s %T Modeling the High-Pressure Ammonia-Water System with WATAM and the Peng-Robinson Equation of State for Kalina Cycle Studies %U http://dx.doi.org/10.1021/ie970638s %V 37 %X The Kalina power cycle uses an ammoniawater mixture as the working fluid in the 283-866 K temperature range and at pressures up to 22 MPa. Modeling of these cycles, typically accomplished with a process simulator, requires accurate descriptions of the phase behavior of this binary. Therefore 58 previously published Pxy isotherms in the 203618 K temperature range were used to evaluate the predictive capabilities of the Peng-Robinson (PR) equation of state (EOS) and WATAM. WATAM provided a much better correlation of saturated liquid densities than the PR EOS. Although both models adequately correlated liquid phase compositions, WATAM provided a better fit of the near-critical vapor phase data. The PengRobinson EOS consistently overestimated the mixture critical pressures. Several correlations, based on different objective functions, for the temperature-dependent binary interaction parameter were developed. Slight improvements in the predictive capabilities of the PR EOS were realized using the Panagiotopolous and Reid composition-dependent mixing rule, which required two temperature-dependent parameters. Temperature-dependent correlations for each parameter were regressed from PTxy data. Guidelines for using the PR EOS in a process simulator to model Kalina cycles were developed.

@article{Enick1998, abstract = {The Kalina power cycle uses an ammoniawater mixture as the working fluid in the 283-866 K temperature range and at pressures up to 22 MPa. Modeling of these cycles, typically accomplished with a process simulator, requires accurate descriptions of the phase behavior of this binary. Therefore 58 previously published Pxy isotherms in the 203618 K temperature range were used to evaluate the predictive capabilities of the Peng-Robinson (PR) equation of state (EOS) and WATAM. WATAM provided a much better correlation of saturated liquid densities than the PR EOS. Although both models adequately correlated liquid phase compositions, WATAM provided a better fit of the near-critical vapor phase data. The PengRobinson EOS consistently overestimated the mixture critical pressures. Several correlations, based on different objective functions, for the temperature-dependent binary interaction parameter were developed. Slight improvements in the predictive capabilities of the PR EOS were realized using the Panagiotopolous and Reid composition-dependent mixing rule, which required two temperature-dependent parameters. Temperature-dependent correlations for each parameter were regressed from PTxy data. Guidelines for using the PR EOS in a process simulator to model Kalina cycles were developed. }, added-at = {2011-01-19T18:05:54.000+0100}, author = {Enick, Robert M. and Donahey, Glenn P. and Holsinger, Mike}, biburl = {https://www.bibsonomy.org/bibtex/21f2e5179d3684ca1a38935841935edcc/thorade}, description = {Modeling the High-Pressure Ammonia−Water System with WATAM and the Peng−Robinson Equation of State for Kalina Cycle Studies - Industrial & Engineering Chemistry Research (ACS Publications)}, doi = {10.1021/ie970638s}, eprint = {http://pubs.acs.org/doi/pdf/10.1021/ie970638s}, interhash = {74a2ca73a026b5fe5d7decd20f623bf2}, intrahash = {1f2e5179d3684ca1a38935841935edcc}, journal = {Industrial \& Engineering Chemistry Research}, keywords = {ammonia+water 1998 Kalina equation-of-state power-cycle analysis}, number = 5, pages = {1644-1650}, timestamp = {2011-01-19T18:05:54.000+0100}, title = {Modeling the High-Pressure Ammonia-Water System with WATAM and the Peng-Robinson Equation of State for Kalina Cycle Studies}, url = {http://dx.doi.org/10.1021/ie970638s}, volume = 37, year = 1998 }