packageExternalMedium
Extends from Modelica.Media.Interfaces.PartialTwoPhaseMedium (Base class for two phase medium of one substance).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Media.Interfaces.Choices.IndependentVariables | ThermoStates (from PartialMedium) | Enumeration type for independent variables | |
| String | mediumName (from PartialMedium) | "unusablePartialMedium" | Name of the medium |
| String[:] | substanceNames (from PartialMedium) | {mediumName} | Names of the mixture substances. Set substanceNames={mediumName} if only one substance. |
| String[:] | extraPropertiesNames (from PartialMedium) | fill("", 0) | Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused |
| Boolean | singleState (from PartialMedium) | = true, if u and d are not a function of pressure | |
| Boolean | reducedX (from PartialMedium) | true | = true, if medium contains the equation sum(X) = 1.0; set reducedX=true, if only one substance (see docu for details) |
| Boolean | fixedX (from PartialMedium) | false | = true, if medium contains the equation X = reference_X |
| AbsolutePressure | reference_p (from PartialMedium) | 101325 | Reference pressure of Medium: default 1 atmosphere |
| Temperature | reference_T (from PartialMedium) | 298.15 | Reference temperature of Medium: default 25 deg Celsius |
| MassFraction[nX] | reference_X (from PartialMedium) | fill(1/nX, nX) | Default mass fractions of medium |
| AbsolutePressure | p_default (from PartialMedium) | 101325 | Default value for pressure of medium (for initialization) |
| Temperature | T_default (from PartialMedium) | Modelica.Units.Conversions.from_degC(20) | Default value for temperature of medium (for initialization) |
| SpecificEnthalpy | h_default (from PartialMedium) | specificEnthalpy_pTX(p_default, T_default, X_default) | Default value for specific enthalpy of medium (for initialization) |
| MassFraction[nX] | X_default (from PartialMedium) | reference_X | Default value for mass fractions of medium (for initialization) |
| ExtraProperty[nC] | C_default (from PartialMedium) | fill(0, nC) | Default value for trace substances of medium (for initialization) |
| Integer | nS (from PartialMedium) | size(substanceNames, 1) | Number of substances |
| Integer | nX (from PartialMedium) | nS | Number of mass fractions |
| Integer | nXi (from PartialMedium) | if fixedX then 0 else if reducedX then nS - 1 else nS | Number of structurally independent mass fractions (see docu for details) |
| Integer | nC (from PartialMedium) | size(extraPropertiesNames, 1) | Number of extra (outside of standard mass-balance) transported properties |
| Real[nC] | C_nominal (from PartialMedium) | 1.0e-6*ones(nC) | Default for the nominal values for the extra properties |
| Boolean | smoothModel (from PartialTwoPhaseMedium) | false | = true, if the (derived) model should not generate state events |
| Boolean | onePhase (from PartialTwoPhaseMedium) | false | = true, if the (derived) model should never be called with two-phase inputs |
| FluidConstants | fluidConstants (from PartialTwoPhaseMedium) | Constant data for the fluid | |
| String | refName | "Propane" | name of the reference fluid for ECS calculations. Defaults to propane |
| String | resDir | Modelica.Utilities.Files.loadResource("modelica://FreeFluids/Resources") | resources directory |
| FluidConstants | fluidK | just for minimum data out of the SubstanceData external object | |
| String | description | " " | Description of the EOS and correlations used for the substance |
| Integer | refState | 1 | 1=ASHRAE, 2=IIR, 3=NBP, >3=User. When user, the value at reference_T and reference_p as 0 |
| String | inputChoice | "ph" | Allows to choose the input variables to use for the construction of a BaseProperties object. alternatives: ph,pT,dT |
| Integer | thermoModel | 1 | 1 for cubic EOS; 2 for SAFT; 3 Saltzmann and Wagner. All transport properties will be computed by correlations |
| Integer | ancillaries | 0 | if 0 no ancillary function will be used, if 1 they will be used for cubic EOS, if 2 for SAFT, and if 3 for SW. It indicates for which EOS are the functions fitted |
| Real | T_min | 150.0 | needed for compatibility with Buildings |
| Real | TCri | fluidK.criticalTemperature | needed for compatibility with Buildings |
| Real | pCri | fluidK.criticalPressure | needed for compatibility with Buildings |
Contents
| Name | Description |
|---|---|
| Return saturation pressure from T | |
| Return saturation temperature from P | |
| Return derivative of saturation temperature w.r.t. pressure | |
| eosCriticalConstants | |
| pressureEOS_dT | Return pressure given temperature and density, by EOS |
| densities_pT | Return liquid and gas densities at give temperature and pressure, by EOS, bellow the critical temperature |
| dhsFrom_pT | Return liquid and gas densities at give temperature and pressure, by EOS, bellow the critical temperature |
| solveEOS | Calls the external function that calculates some basic thermodynamic properties of the phases, used later for the definition of the ThermodynamicState and the calculation of all thermodynamic properties |
| Return ThermodynamicState record as function of p,T and composition X or Xi. The function from T and P is unable to compute any gas fraction different from 0 or 1 | |
| Return thermodynamic state as function of density, T and composition X or Xi | |
| Return thermodynamic state as function of pressure, enthalpy and composition X or Xi | |
| Return thermodynamic state as function of pressure, entropy and composition X or Xi | |
| The input is a SaturationProperties record called sat. Returns the ThermodynamicState record at the dew point | |
| The input is a SaturationProperties record called sat. Returns the ThermodynamicState record at the bubble point | |
| Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b | |
| Return pressure | |
| Return temperature | |
| Return density | |
| Return density derivative w.r.t. pressure at const temperature | |
| Return density derivative w.r.t. temperature at constant pressure | |
| Return density derivative w.r.t. pressure at const specific enthalpy | |
| Return density derivative w.r.t. specific enthalpy at constant pressure | |
| Return specific enthalpy | |
| Return specific internal energy | |
| Return specific entropy | |
| Return specific Gibbs energy | |
| Return specific Helmholtz energy | |
| Return specific heat capacity at constant pressure | |
| Return specific heat capacity at constant volume | |
| Return isentropic exponent | |
| Return velocity of sound | |
| Returns the isobaric expansion coefficient beta | |
| Returns overall the isothermal compressibility factor | |
| jouleThomsonCoefficient | |
| isothermalThrottlingCoefficient | OK. The ExternalMedia function is not found !! |
| Return dynamic viscosity from a ThermodynamicState record | |
| Return thermal conductivity | |
| liquidDynamicViscosity | Return liquid dynamic viscosity from a ThermodynamicState record |
| gasDynamicViscosity | Return gas dynamic viscosity from a ThermodynamicState record |
| liquidThermalConductivity | Return liquid thermal conductivity from a ThermodynamicState record |
| gasThermalConductivity | Return gas thermal conductivity from a ThermodynamicState record |
| Return surface tension | |
| Return bubble point density | |
| Return bubble point density derivative | |
| Return dew point density | |
| Return dew point density derivative | |
| Return bubble point specific enthalpy | |
| Return bubble point specific enthalpy derivative | |
| Return dew point specific enthalpy | |
| Return bubble point specific enthalpy derivative | |
| vaporizationEnthalpy | |
| Return bubble point specific entropy | |
| Return dew point specific entropy | |
| dPressureVap_dSpecificVolume_Tv | Derivative of pressure with regards to specific volume, at constant T |
| dPressureVap_dTemperature_Tv | Derivative of pressure with regards to temperature, at constant v |
| enthalpySatLiq_T | Function that calculates the enthalpy of saturated liquid based on temperature |
| enthalpySatVap_T | Function that calculates the specific enthalpy of saturated vapor based on temperature |
| isentropicExponentVap_Tv | Function that calculates the isentropic exponent of vapor based on temperature and specific volume |
| pressureSatVap_T | Function that calculates the pressure of saturated vapor based on temperature |
| pressureVap_Tv | Function that calculates the pressure vapor based on temperature and specific volume |
| specificIsobaricHeatCapacityVap_Tv | Function that calculates the specific isobaric heat capacity of vapor based on temperature and specific volume |
| specificIsochoricHeatCapacityVap_Tv | Function that calculates the specific isochoric heat capacity of vapor based on temperature and specific volume |
| specificVolumeVap_pT | Function that calculates the specific volume of the vapor based on pressure and temperature |