.Modelica.Media.Incompressible.TableBased

Information

This is the base package for medium models of incompressible fluids based on tables. The minimal data to provide for a useful medium description is tables of density and heat capacity as functions of temperature.

It should be noted that incompressible media only have 1 state per control volume (usually T), but have both T and p as inputs for fully correct properties. The error of using only T-dependent properties is small, therefore a Boolean flag enthalpyOfT exists. If it is true, the enumeration Choices.IndependentVariables is set to Choices.IndependentVariables.T otherwise it is set to Choices.IndependentVariables.pT.

Using the package TableBased

To implement a new medium model, create a package that extends TableBased and provides one or more of the constant tables:

tableDensity        = [T, d];
tableHeatCapacity   = [T, Cp];
tableConductivity   = [T, lam];
tableViscosity      = [T, eta];
tableVaporPressure  = [T, pVap];

The table data is used to fit constant polynomials of order npol, the temperature data points do not need to be same for different properties. Properties like enthalpy, inner energy and entropy are calculated consistently from integrals and derivatives of d(T) and Cp(T). The minimal data for a useful medium model is thus density and heat capacity. Transport properties and vapor pressure are optional, if the data tables are empty the corresponding function calls can not be used.

Contents

Name	Description
invertTemp	Function to invert temperatures
BaseProperties	Base properties of T dependent medium
setState_pTX	Returns state record, given pressure and temperature
setState_dTX	Returns state record, given pressure and temperature
setState_pT	Returns state record as function of p and T
setState_phX	Returns state record, given pressure and specific enthalpy
setState_ph	Returns state record as function of p and h
setState_psX	Returns state record, given pressure and specific entropy
setState_ps	Returns state record as function of p and s
setSmoothState	Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b
specificHeatCapacityCv	Specific heat capacity at constant volume (or pressure) of medium
specificHeatCapacityCp	Specific heat capacity at constant volume (or pressure) of medium
dynamicViscosity	Return dynamic viscosity as a function of the thermodynamic state record
thermalConductivity	Return thermal conductivity as a function of the thermodynamic state record
s_T	Compute specific entropy
specificEntropy	Return specific entropy as a function of the thermodynamic state record
h_T	Compute specific enthalpy from temperature
h_T_der	Compute specific enthalpy from temperature
h_pT	Compute specific enthalpy from pressure and temperature
density_T	Return density as function of temperature
temperature	Return temperature as a function of the thermodynamic state record
pressure	Return pressure as a function of the thermodynamic state record
density	Return density as a function of the thermodynamic state record
specificEnthalpy	Return specific enthalpy as a function of the thermodynamic state record
specificInternalEnergy	Return specific internal energy as a function of the thermodynamic state record
T_ph	Compute temperature from pressure and specific enthalpy
T_ps	Compute temperature from pressure and specific enthalpy
Polynomials_Temp	Temporary Functions operating on polynomials (including polynomial fitting); only to be used in Modelica.Media.Incompressible.TableBased