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If a fluid from the CoolProp library is to be added the following dialogs will appear:

Incompressible fluid [ for pumps, fans only ]

The constant data needed for the design process will be derived at a temperature T1. Three different sets of fluids are available: pure fluids, water mixtures and 2 phase fluids. Water mixtures need the specification of the mass fraction of the added fluid. That means x = 0 is pure water, whereas x = 1 is a mixture without water.

For 2 phase fluids the liquid state shall be used, i.e. p1 > pv and Ttriple < T1 < Tcrit. Triple point temperature as well as critical temperature are used as range limits for the vapor pressure curve, see picture below.

Compressible fluid [ for compressors, turbines only ]

Constant data as well as pressure and temperature dependent properties are displayed in a table. The heat capacity coefficients cpi (at zero pressure) are derived at temperatures T1 and T2. A least square fitting algorithm is used for this purpose.

The gaseous state exists in a certain scope, i.e. p1 < pv and p1 < ptriple  and Ttriple < T1. Triple point temperature as well as critical temperature are used as range limits for the vapor pressure curve, see picture below. Additionally the heat capacity at zero pressure is given as function of T1 and T2 both based on CoolProp as well as on the polynomial with the coefficients cpi.