Single Property Equations (Binary)
Single properties are represented either Directly (e.g., heat capacity, viscosity, etc.) or as Excess properties (e.g., excess volume, excess enthalpy, etc.).
In TDE 3.0, one equation formulation is used for each type of data representation.
General Property Ψ Representation
Ψ = x1×Ψ1 + x2×Ψ2 + Σai×x1×x2×(x1 - x2)i, where xj and Ψj are the mole fraction and property value for component j, and the summation is from i = 0 to nTerms.
General Excess Property ΨEX Representation
ΨEX = Σai×x1×x2×(x1 - x2)i, where xj is the mole fraction of component j, and the summation is from i = 0 to nTerms.
The Vector ai is temperature dependent with 1 to 5 terms.