This package contains a thermally perfect model of moist air.
A medium is called thermally perfect if
In addition, this medium model is calorically perfect, i.e., the specific heat capacities at constant pressure cp and constant volume cv are both constant (Bower 1998).
This medium uses the ideal gas law
ρ = p ⁄(R T),
where ρ is the density, p is the pressure, R is the gas constant and T is the temperature.
The enthalpy is computed using the convention that h=0 if T=0 °C and no water vapor is present.
Note that for typical building simulations, the media Buildings.Media.Air should be used as it leads generally to faster simulation.
Bower, William B. A primer in fluid mechanics: Dynamics of flows in one space dimension. CRC Press. 1998.
| Name | Description |
|---|---|
| ThermodynamicState | ThermodynamicState record for moist air |
| BaseProperties | |
| Xsaturation | Steam water mass fraction of saturation boundary in kg_water/kg_moistair |
| setState_pTX | Thermodynamic state as function of p, T and composition X |
| setState_phX | Thermodynamic state as function of p, h and composition X |
| setState_dTX | Thermodynamic state as function of d, T and composition X |
| gasConstant | Gas constant |
| saturationPressureLiquid | Return saturation pressure of water as a function of temperature T in the range of 273.16 to 373.16 K |
| saturationPressureLiquid_der | Time derivative of saturationPressureLiquid |
| sublimationPressureIce | Saturation curve valid for 223.16 <= T <= 273.16. Outside of these limits a (less accurate) result is returned |
| sublimationPressureIce_der | Derivative function for 'sublimationPressureIce' |
| saturationPressure | Saturation curve valid for 223.16 <= T <= 373.16 (and slightly outside with less accuracy) |
| pressure | Gas pressure |
| temperature | Gas temperature |
| density | Gas density |
| specificEntropy | Specific entropy (liquid part neglected, mixing entropy included) |
| enthalpyOfVaporization | Enthalpy of vaporization of water |
| HeatCapacityOfWater | Specific heat capacity of water (liquid only) which is constant |
| enthalpyOfLiquid | Enthalpy of liquid (per unit mass of liquid) which is linear in the temperature |
| der_enthalpyOfLiquid | Temperature derivative of enthalpy of liquid per unit mass of liquid |
| enthalpyOfCondensingGas | Enthalpy of steam per unit mass of steam |
| der_enthalpyOfCondensingGas | Derivative of enthalpy of steam per unit mass of steam |
| enthalpyOfNonCondensingGas | Enthalpy of non-condensing gas per unit mass of steam |
| der_enthalpyOfNonCondensingGas | Derivative of enthalpy of non-condensing gas per unit mass of steam |
| enthalpyOfGas | Enthalpy of gas mixture per unit mass of gas mixture |
| enthalpyOfDryAir | Enthalpy of dry air per unit mass of dry air |
| der_enthalpyOfDryAir | Derivative of enthalpy of dry air per unit mass of dry air |
| specificHeatCapacityCp | Specific heat capacity of gas mixture at constant pressure |
| der_specificHeatCapacityCp | Derivative of specific heat capacity of gas mixture at constant pressure |
| specificHeatCapacityCv | Specific heat capacity of gas mixture at constant volume |
| der_specificHeatCapacityCv | Derivative of specific heat capacity of gas mixture at constant volume |
| dynamicViscosity | dynamic viscosity of dry air |
| thermalConductivity | Thermal conductivity of dry air as a polynomial in the temperature |
| specificEnthalpy | Specific enthalpy |
| specificEnthalpy_pTX | Specific enthalpy |
| specificInternalEnergy | Specific internal energy |
| specificGibbsEnergy | Specific Gibbs energy |
| specificHelmholtzEnergy | Specific Helmholtz energy |
| temperature_phX | Compute temperature from specific enthalpy and mass fraction |
BaseProperties.Xi.spliceFunction with regStep.
This is for
issue 300.
phi and removed non-required computations.
final standardOrderComponents=true in the
BaseProperties declaration. This avoids an error
when models are checked in Dymola 2014 in the pedenatic mode.
each to Xi(stateSelect=...).
ThermodynamicState to avoid a warning
during model check and translation.
enthalpyOfNonCondensingGas and its derivative.
T_phX.