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Added acentric factor to HelmholtzData. Working on adding calculation of saturation curve using Maxwell phase-equilibrium condition (per IAPWS95).
Checked u,h derivatives with ammonia, nitrogen, hydrogen, all appear to be OK and match finite difference estimates.
Removed redundant HelmholtzExpTerm, and corrected nitrogen.c to use HelmholtzGausTerm instead.
Fixed little error with nitrogen after last changes.
All tests for ammonia pass to within 5.5% (h, u, s, a, p). Remaining error needs further investigation; it looks that REFPROP's cp0 is not agreeing with Tillner-Roth but this needs to be double-checked.
Reverted ammonia cp0 coefficients to calculated values, rather than hacky curvefit values.
Added some GPL headers, fixing water helm_ideal coefficients.
Worked out that errors in helmholtz_a are linear in T... what to do?
Still working on fixing helmholtz_a.
Added tests for Helmholtz energy, still failing.
Fix offsets for u, h. Still need to fix entropy routines.
Comments about difference in cp0.
Fixed error in helm_ideal_tau formula.
p, u, h working for nitrogen, still problems with s.
Fixed evaluation of cp0 for both ammonia and nitrogen now.
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.
Cleaned up helmholtz_resid_del, seems to be fixed now.
Fixed test data for ammonia p,h,s: agreement to 0.09% for all values.
Added 'exponential' terms for nitrogen correlation (still testing).
Checked in generalised version of ideal gas component. Working on adding the 'exponential' term for the Nitrogen correlation.
Converted ammonia data and tests into a separate file.
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