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Added acentric factor to HelmholtzData. Working on adding calculation of saturation curve using Maxwell phase-equilibrium condition (per IAPWS95).
Still some error near critical point for calculation of speed of sound. However this error is not reconcilable with both IAPWS95 and REFPROP8, because those two sources give different values. The value returned by FPROPS is midway between the two.
Normalising code for critical terms; still a bug with calculation of helmholtz_w in critical region.
Added critical terms to helm_resid_deldel and helm_resid_deltau. Tests are still not passing though, need to check for errors.
Added helmholtz_w and helmholtz_cp. Added test for helmholtz_w with water. This exposes the fact that helm_resid_deldel and helm_resid_deltau need critical terms added.
Added critical terms to helm_resid_tautau. Tests for water for cv pass.
Added evaluation of helm_resid_tau, gives correct values for entropy with water.
Fixed helm_resid and helm_resid_del with critical terms.
Added critical term calculation in helm_resid. Added gaussian and critical term values for water from IAPWS95. Added some test data from IAPWS95 to water.c tests.
Fixed (du/drho)_T
Fixed bug with du/dT and dh/dT.
Implemented (dh/drho)_T
Fixed problem with dh/dT_rho.
Fixed most of the problem with dh/dT_rho, still not right.
Adding calculation of derivatives of h.
The helmholtz_p function now provides its own derivatives to ASCEND. Restored full test suite for Hydrogen.
helm_resid_deldel working now, dpdrho_T fixed. Need to wire in with ASCEND now.
Working on dpdrho_T, still looks like problems with Gaussian terms.
Fixed initialisation error in helm_resid_deltau.
Calculated (dp/dT)_rho, seems to look OK when testing with hydrogen.
Removed redundant HelmholtzExpTerm, and corrected nitrogen.c to use HelmholtzGausTerm instead.
fixed helm_resid_tau for calculation of gaussian terms.
Fixed hydrogen for helmholtz_p (there was a typo in the power term coeffs!)
Debugging hydrogen, checked helm_resid_del values against spread, seem OK...
Fixed small bug in helm_resid_tau, but still not correct.
Fixed bug in helm_resid_tau for gaussian terms.
Note about wrong functions (needing rewrite).
Fixed little error with nitrogen after last changes.
Working on debugging gaussian terms.
Starting work on data structures for 'critical terms' as used in water and hydrogen correlations.
Worked out that errors in helmholtz_a are linear in T... what to do?
More accurate value of the linear constant gives better agreement of h, u for nitrogen.
Fixed error in helmholtz_a.
More debugging
helm_resid seems to agree with spreadsheet now, still perhaps probs with helm_ideal.
Still working on fixing helmholtz_a.
working on debugging helmholtz_a.
Added tests for Helmholtz energy, still failing.
Fix offsets for u, h. Still need to fix entropy routines.
p, u, h working for nitrogen, still problems with s.
Fixed evaluation of cp0 for both ammonia and nitrogen now.
Fixed up some warnings for non-test mode.
Added ideal cp0 values to test data and added calculation function for this. Works for nitrogen but not for ammonia.
Split out ideal curves from helmholtz.c.
Working on helmholtz_h with nitrogen.
Cleaned up helmholtz_resid_del, seems to be fixed now.
Fixed calculation of nitrogen helmholtz_p.
Fixed test data for ammonia p,h,s: agreement to 0.09% for all values.
Getting closer with nitrogen test data.
Added 'exponential' terms for nitrogen correlation (still testing).
Fixed helm_resid and helm_resid_tau.
Checked in generalised version of ideal gas component. Working on adding the 'exponential' term for the Nitrogen correlation.
Refactor helm_resid_tau.
Fix copyright date.
All tests pass to max error 2.0% (errors for low temperature liquids)
Added entropy relation and tests. All entropy tests pass to within 0.03%.
Fixed some problems with helmholtz_h.
Test cases for helmholtz_p now passing, need to fix helmholtz_u.
Fixed: tests for pressure relation are working now.
Added functions for enthalpy and internal energy. Test suites still needed!
Added helmholtz_u and helmholtz_h, still require testing.
More on helmholtz functions.
Added new code for calculating properties according to modified BWR correlation, also some initial work on Helmholtz free energy correlation.
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