DELTAV_fusion

DELTAV_fusion

DELTAV_fusion returns the volume change of fusion defined as the difference between the specific volume of liquid and the specific volume of solid at the triple point. This function uses the P_Melting function and is only available for fluids for which this function is available. The value is calculated using the Clapeyron relation.

Note that the volume of the solid at temperature at or above the triple point temperature can be estimated as: V_solid(T) = V_sat liquid(T)-DELTAV_fusion. The pressure corresponding to the solid phase is found using the P_Melting function.

Example: {Determine the volume and enthalpy of solid carbon dioxide at the triple point}

$UnitSystem SI K kPa Mass

F$='Carbondioxide'

T_t=T_triple(F$)

V_liquid=Volume(F$,T=T_t,x=0)

V_solid=V_liquid-DELTAV_fusion(F$)

h_liquid=Enthalpy(F$,T=T_t,x=0)

h_solid=h_liquid-Enthalpy_Fusion(F$)

{Solution:

F$='Carbondioxide'

h_liquid=-426.8 [kJ/kg]

h_solid=-631.7 [kJ/kg]