Calculation of a liquid branch of the saturation line R218 in MATHCAD
Annotation
The equation of a liquid branch of a line of phase equilibrium R218 which satisfies to a scale hypothesis is offered, has a working range from a threefold point to a critical point and is set in the form of dependence of temperature on a line of saturation from density. The gained equation can be used in the refrigerating, cryogenic technics. Evaluation of coefficients of the equation was yielded in mathematical package MathCAD. In article all necessary formulas and values of coefficients for equation use are given. The analysis of the first derivative of the equation of a liquid branch of a line of phase equilibrium is carried out and is shown that its behaviour has the monotonous character in all working area. The table for liquid phase R218 in a state of saturation with the calculated values of temperature, density and the first derivative on density is given. The gained equation can be used as a basic curve at build-up of scale and wide-band equations of state.
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