Buildings.Media.ConstantPropertyLiquidWater

Package with model for liquid water with constant properties

Information

This medium model is identical to Buildings.Media.ConstantPropertyLiquidWater, except for the following points:

It allows computing a compressibility of the medium. This helps breaking algebraic loops, but the system gets stiff. The compressibility is defined by the constant kappa_const. If kappa_const=0, then the density is constant. Otherwise, the density is
ρ(p) = ρ(p0) ( 1 + κ_const (p-p₀)) This equation is implemented in the base class Buildings.Media.Interfaces.PartialSimpleMedium.
It implements the function that computes the specific internal energy.

Extends from Buildings.Media.ConstantPropertyLiquidWater.BaseClasses.ConstantPropertyLiquidWater (Water: Simple liquid water medium (incompressible, constant data)).

Package Content

Name Description

specificInternalEnergy Return specific internal energy

BaseClasses Package with base classes for Buildings.Media.ConstantPropertyLiquidWater

Inherited

cp_const Constant specific heat capacity at constant pressure

cv_const Constant specific heat capacity at constant volume

d_const Constant density

eta_const Constant dynamic viscosity

lambda_const Constant thermal conductivity

a_const Constant velocity of sound

T_min Minimum temperature valid for medium model

T_max Maximum temperature valid for medium model

T0=reference_T Zero enthalpy temperature

MM_const Molar mass

fluidConstants fluid constants

ThermodynamicState Thermodynamic state

kappa_const=0 Compressibility factor at constant temperature

p0=3E5 Reference pressure for compressibility and default medium pressure

constantDensity=(kappa_const <= 1E-20) Flag, true if density is modeled as a constant

BaseProperties

setState_pTX Return thermodynamic state from p, T, and X or Xi

setState_phX Return thermodynamic state from p, h, and X or Xi

setState_psX Return thermodynamic state from p, s, and X or Xi

setState_dTX Return thermodynamic state from d, T, and X or Xi

setSmoothState Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b

dynamicViscosity Return dynamic viscosity

thermalConductivity Return thermal conductivity

pressure Return pressure

temperature Return temperature

density Return density

specificEnthalpy Return specific enthalpy

specificHeatCapacityCp Return specific heat capacity at constant pressure

specificHeatCapacityCv Return specific heat capacity at constant volume

isentropicExponent Return isentropic exponent

velocityOfSound Return velocity of sound

specificEnthalpy_pTX Return specific enthalpy from p, T, and X or Xi

temperature_phX Return temperature from p, h, and X or Xi

density_phX Return density from p, h, and X or Xi

setState_pT Return thermodynamic state from p and T

setState_ph Return thermodynamic state from p and h

setState_ps Return thermodynamic state from p and s

setState_dT Return thermodynamic state from d and T

density_ph Return density from p and h

temperature_ph Return temperature from p and h

pressure_dT Return pressure from d and T

specificEnthalpy_dT Return specific enthalpy from d and T

specificEnthalpy_ps Return specific enthalpy from p and s

temperature_ps Return temperature from p and s

density_ps Return density from p and s

specificEnthalpy_pT Return specific enthalpy from p and T

density_pT Return density from p and T

ThermoStates Enumeration type for independent variables

mediumName="unusablePartialMedium" Name of the medium

substanceNames={mediumName} Names of the mixture substances. Set substanceNames={mediumName} if only one substance.

extraPropertiesNames=fill("", 0) Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused

singleState = true, if u and d are not a function of pressure

reducedX=true = true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details)

fixedX=false = true if medium contains the equation X = reference_X

reference_p=101325 Reference pressure of Medium: default 1 atmosphere

reference_T=298.15 Reference temperature of Medium: default 25 deg Celsius

reference_X=fill(1/nX, nX) Default mass fractions of medium

p_default=101325 Default value for pressure of medium (for initialization)

T_default=Modelica.SIunits.Conversions.from_degC(20) Default value for temperature of medium (for initialization)

h_default=specificEnthalpy_pTX(p_default, T_default, X_default) Default value for specific enthalpy of medium (for initialization)

X_default=reference_X Default value for mass fractions of medium (for initialization)

nS=size(substanceNames, 1) Number of substances

nX=nS Number of mass fractions

nXi=if fixedX then 0 else if reducedX then nS - 1 else nS Number of structurally independent mass fractions (see docu for details)

nC=size(extraPropertiesNames, 1) Number of extra (outside of standard mass-balance) transported properties

C_nominal=1.0e-6*ones(nC) Default for the nominal values for the extra properties

FluidConstants critical, triple, molecular and other standard data of fluid

prandtlNumber Return the Prandtl number

specificEntropy Return specific entropy

specificGibbsEnergy Return specific Gibbs energy

specificHelmholtzEnergy Return specific Helmholtz energy

heatCapacity_cp alias for deprecated name

heatCapacity_cv alias for deprecated name

isentropicEnthalpy Return isentropic enthalpy

isobaricExpansionCoefficient Return overall the isobaric expansion coefficient beta

beta alias for isobaricExpansionCoefficient for user convenience

isothermalCompressibility Return overall the isothermal compressibility factor

kappa alias of isothermalCompressibility for user convenience

density_derp_h Return density derivative w.r.t. pressure at const specific enthalpy

density_derh_p Return density derivative w.r.t. specific enthalpy at constant pressure

density_derp_T Return density derivative w.r.t. pressure at const temperature

density_derT_p Return density derivative w.r.t. temperature at constant pressure

density_derX Return density derivative w.r.t. mass fraction

molarMass Return the molar mass of the medium

specificEntropy_pTX Return specific enthalpy from p, T, and X or Xi

density_pTX Return density from p, T, and X or Xi

temperature_psX Return temperature from p,s, and X or Xi

density_psX Return density from p, s, and X or Xi

specificEnthalpy_psX Return specific enthalpy from p, s, and X or Xi

AbsolutePressure Type for absolute pressure with medium specific attributes

Density Type for density with medium specific attributes

DynamicViscosity Type for dynamic viscosity with medium specific attributes

EnthalpyFlowRate Type for enthalpy flow rate with medium specific attributes

MassFlowRate Type for mass flow rate with medium specific attributes

MassFraction Type for mass fraction with medium specific attributes

MoleFraction Type for mole fraction with medium specific attributes

MolarMass Type for molar mass with medium specific attributes

MolarVolume Type for molar volume with medium specific attributes

IsentropicExponent Type for isentropic exponent with medium specific attributes

SpecificEnergy Type for specific energy with medium specific attributes

SpecificInternalEnergy Type for specific internal energy with medium specific attributes

SpecificEnthalpy Type for specific enthalpy with medium specific attributes

SpecificEntropy Type for specific entropy with medium specific attributes

SpecificHeatCapacity Type for specific heat capacity with medium specific attributes

SurfaceTension Type for surface tension with medium specific attributes

Temperature Type for temperature with medium specific attributes

ThermalConductivity Type for thermal conductivity with medium specific attributes

PrandtlNumber Type for Prandtl number with medium specific attributes

VelocityOfSound Type for velocity of sound with medium specific attributes

ExtraProperty Type for unspecified, mass-specific property transported by flow

CumulativeExtraProperty Type for conserved integral of unspecified, mass specific property

ExtraPropertyFlowRate Type for flow rate of unspecified, mass-specific property

IsobaricExpansionCoefficient Type for isobaric expansion coefficient with medium specific attributes

DipoleMoment Type for dipole moment with medium specific attributes

DerDensityByPressure Type for partial derivative of density with resect to pressure with medium specific attributes

DerDensityByEnthalpy Type for partial derivative of density with resect to enthalpy with medium specific attributes

DerEnthalpyByPressure Type for partial derivative of enthalpy with resect to pressure with medium specific attributes

DerDensityByTemperature Type for partial derivative of density with resect to temperature with medium specific attributes

Choices Types, constants to define menu choices

Name	Description
specificInternalEnergy	Return specific internal energy
BaseClasses	Package with base classes for Buildings.Media.ConstantPropertyLiquidWater
Inherited
cp_const	Constant specific heat capacity at constant pressure
cv_const	Constant specific heat capacity at constant volume
d_const	Constant density
eta_const	Constant dynamic viscosity
lambda_const	Constant thermal conductivity
a_const	Constant velocity of sound
T_min	Minimum temperature valid for medium model
T_max	Maximum temperature valid for medium model
T0=reference_T	Zero enthalpy temperature
MM_const	Molar mass
fluidConstants	fluid constants
ThermodynamicState	Thermodynamic state
kappa_const=0	Compressibility factor at constant temperature
p0=3E5	Reference pressure for compressibility and default medium pressure
constantDensity=(kappa_const <= 1E-20)	Flag, true if density is modeled as a constant
BaseProperties
setState_pTX	Return thermodynamic state from p, T, and X or Xi
setState_phX	Return thermodynamic state from p, h, and X or Xi
setState_psX	Return thermodynamic state from p, s, and X or Xi
setState_dTX	Return thermodynamic state from d, T, and X or Xi
setSmoothState	Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b
dynamicViscosity	Return dynamic viscosity
thermalConductivity	Return thermal conductivity
pressure	Return pressure
temperature	Return temperature
density	Return density
specificEnthalpy	Return specific enthalpy
specificHeatCapacityCp	Return specific heat capacity at constant pressure
specificHeatCapacityCv	Return specific heat capacity at constant volume
isentropicExponent	Return isentropic exponent
velocityOfSound	Return velocity of sound
specificEnthalpy_pTX	Return specific enthalpy from p, T, and X or Xi
temperature_phX	Return temperature from p, h, and X or Xi
density_phX	Return density from p, h, and X or Xi
setState_pT	Return thermodynamic state from p and T
setState_ph	Return thermodynamic state from p and h
setState_ps	Return thermodynamic state from p and s
setState_dT	Return thermodynamic state from d and T
density_ph	Return density from p and h
temperature_ph	Return temperature from p and h
pressure_dT	Return pressure from d and T
specificEnthalpy_dT	Return specific enthalpy from d and T
specificEnthalpy_ps	Return specific enthalpy from p and s
temperature_ps	Return temperature from p and s
density_ps	Return density from p and s
specificEnthalpy_pT	Return specific enthalpy from p and T
density_pT	Return density from p and T
ThermoStates	Enumeration type for independent variables
mediumName="unusablePartialMedium"	Name of the medium
substanceNames={mediumName}	Names of the mixture substances. Set substanceNames={mediumName} if only one substance.
extraPropertiesNames=fill("", 0)	Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused
singleState	= true, if u and d are not a function of pressure
reducedX=true	= true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details)
fixedX=false	= true if medium contains the equation X = reference_X
reference_p=101325	Reference pressure of Medium: default 1 atmosphere
reference_T=298.15	Reference temperature of Medium: default 25 deg Celsius
reference_X=fill(1/nX, nX)	Default mass fractions of medium
p_default=101325	Default value for pressure of medium (for initialization)
T_default=Modelica.SIunits.Conversions.from_degC(20)	Default value for temperature of medium (for initialization)
h_default=specificEnthalpy_pTX(p_default, T_default, X_default)	Default value for specific enthalpy of medium (for initialization)
X_default=reference_X	Default value for mass fractions of medium (for initialization)
nS=size(substanceNames, 1)	Number of substances
nX=nS	Number of mass fractions
nXi=if fixedX then 0 else if reducedX then nS - 1 else nS	Number of structurally independent mass fractions (see docu for details)
nC=size(extraPropertiesNames, 1)	Number of extra (outside of standard mass-balance) transported properties
C_nominal=1.0e-6*ones(nC)	Default for the nominal values for the extra properties
FluidConstants	critical, triple, molecular and other standard data of fluid
prandtlNumber	Return the Prandtl number
specificEntropy	Return specific entropy
specificGibbsEnergy	Return specific Gibbs energy
specificHelmholtzEnergy	Return specific Helmholtz energy
heatCapacity_cp	alias for deprecated name
heatCapacity_cv	alias for deprecated name
isentropicEnthalpy	Return isentropic enthalpy
isobaricExpansionCoefficient	Return overall the isobaric expansion coefficient beta
beta	alias for isobaricExpansionCoefficient for user convenience
isothermalCompressibility	Return overall the isothermal compressibility factor
kappa	alias of isothermalCompressibility for user convenience
density_derp_h	Return density derivative w.r.t. pressure at const specific enthalpy
density_derh_p	Return density derivative w.r.t. specific enthalpy at constant pressure
density_derp_T	Return density derivative w.r.t. pressure at const temperature
density_derT_p	Return density derivative w.r.t. temperature at constant pressure
density_derX	Return density derivative w.r.t. mass fraction
molarMass	Return the molar mass of the medium
specificEntropy_pTX	Return specific enthalpy from p, T, and X or Xi
density_pTX	Return density from p, T, and X or Xi
temperature_psX	Return temperature from p,s, and X or Xi
density_psX	Return density from p, s, and X or Xi
specificEnthalpy_psX	Return specific enthalpy from p, s, and X or Xi
AbsolutePressure	Type for absolute pressure with medium specific attributes
Density	Type for density with medium specific attributes
DynamicViscosity	Type for dynamic viscosity with medium specific attributes
EnthalpyFlowRate	Type for enthalpy flow rate with medium specific attributes
MassFlowRate	Type for mass flow rate with medium specific attributes
MassFraction	Type for mass fraction with medium specific attributes
MoleFraction	Type for mole fraction with medium specific attributes
MolarMass	Type for molar mass with medium specific attributes
MolarVolume	Type for molar volume with medium specific attributes
IsentropicExponent	Type for isentropic exponent with medium specific attributes
SpecificEnergy	Type for specific energy with medium specific attributes
SpecificInternalEnergy	Type for specific internal energy with medium specific attributes
SpecificEnthalpy	Type for specific enthalpy with medium specific attributes
SpecificEntropy	Type for specific entropy with medium specific attributes
SpecificHeatCapacity	Type for specific heat capacity with medium specific attributes
SurfaceTension	Type for surface tension with medium specific attributes
Temperature	Type for temperature with medium specific attributes
ThermalConductivity	Type for thermal conductivity with medium specific attributes
PrandtlNumber	Type for Prandtl number with medium specific attributes
VelocityOfSound	Type for velocity of sound with medium specific attributes
ExtraProperty	Type for unspecified, mass-specific property transported by flow
CumulativeExtraProperty	Type for conserved integral of unspecified, mass specific property
ExtraPropertyFlowRate	Type for flow rate of unspecified, mass-specific property
IsobaricExpansionCoefficient	Type for isobaric expansion coefficient with medium specific attributes
DipoleMoment	Type for dipole moment with medium specific attributes
DerDensityByPressure	Type for partial derivative of density with resect to pressure with medium specific attributes
DerDensityByEnthalpy	Type for partial derivative of density with resect to enthalpy with medium specific attributes
DerEnthalpyByPressure	Type for partial derivative of enthalpy with resect to pressure with medium specific attributes
DerDensityByTemperature	Type for partial derivative of density with resect to temperature with medium specific attributes
Choices	Types, constants to define menu choices

Buildings.Media.ConstantPropertyLiquidWater.specificInternalEnergy

Return specific internal energy

Information

Inputs

Type Name Default Description

ThermodynamicState state

Type	Name	Default	Description
ThermodynamicState	state

Outputs

Type Name Description

SpecificEnergy u Specific internal energy [J/kg]

Type	Name	Description
SpecificEnergy	u	Specific internal energy [J/kg]

Modelica definition

redeclare replaceable function extends specificInternalEnergy 
  "Return specific internal energy"
 input ThermodynamicState state;
 output SpecificEnergy u "Specific internal energy";
algorithm 
  u := cv_const * (state.T-T0);
end specificInternalEnergy;

Automatically generated Thu Dec 8 16:35:28 2011.