.ThermofluidStream.Media.myMedia.R134a.R134a_ph

Information

Calculation of fluid properties for Tetrafluoroethane (R134a) in the fluid region of 0.0039 bar (Triple pressure) to 700 bar and 169.85 Kelvin (Triple temperature) to 455 Kelvin.

Restriction

The functions provided by this package shall be used inside of the restricted limits according to the referenced literature.

• 0.0039 bar ≤ p ≤ 700 bar
• 169.85 Kelvin ≤ T ≤ 455 Kelvin
• explicit for pressure and specific enthalpy

References

Baehr, H.D. and Tillner-Roth, R.:

Thermodynamic Properties of Environmentally Acceptable Refrigerants - Equations of State and Tables for Ammonia, R22, R134a, R152a, and R123. Springer-Verlag, Berlin (Germany), 1994.

Klein, McLinden and Laesecke:

An improved extended corresponding states method for estimation of viscosity of pure refrigerants and mixtures. Int. J. Refrig., Vol. 20, No.3, pp. 208-217, 1997.

McLinden, Klein. and Perkins:

An extended corresponding states model for the thermal conductivity of refrigerants and refrigerant mixtures. Int. J. Refrig., 23 (2000) 43-63.

Okada and Higashi:

Surface tension correlation of HFC-134a and HCFC-123. Proceedings of the Joint Meeting of IIR Commissions B1, B2, E1, and E2, Padua, Italy, pp. 541-548, 1994.

Contents

Name	Description
SaturationProperties
ThermodynamicState	Thermodynamic state
BaseProperties	Base properties of R134a
setState_phX	Set state for pressure and specific enthalpy (X not used since single substance)
setState_dTX	Set state for density and temperature (X not used since single substance)
setState_psX	Set state for pressure and specific entropy (X not used since single substance)
setState_pTX	Set state for pressure and temperature (X not used since single substance)
setBubbleState	Return the thermodynamic state on the bubble line
setDewState	Return the thermodynamic state on the dew line
density_ph	Density as function of pressure and specific enthalpy
density	Density as function of pressure and specific enthalpy | use setState_phX function for input
temperature_ph	Temperature as function of pressure and specific enthalpy
temperature	Temperature as function of pressure and specific enthalpy | use setState_phX function for input
pressure	Pressure w.r.t. thermodynamic state
specificInternalEnergy	Specific internal energy w.r.t. thermodynamic state
specificEnthalpy	Specific enthalpy w.r.t. thermodynamic state | use setState_phX function for input
specificEntropy	Specific entropy w.r.t. thermodynamic state | use setState_phX function for input if necessary
saturationTemperature	Saturation temperature in two-phase region
saturationTemperature_derp	Derivative of saturation temperature in two-phase region
saturationTemperature_der_p	Time derivative of saturation temperature in two-phase region
bubbleDensity	Density of liquid phase w.r.t. saturation pressure | use setSat_p function for input
dBubbleDensity_dPressure	Derivative of liquid density in two-phase region w.r.t. pressure
dBubbleDensity_dPressure_der_sat	Time derivative of liquid density in two-phase region w.r.t. pressure
dewDensity	Density of vapor phase w.r.t. saturation pressure | use setSat_p function for input
dDewDensity_dPressure	Derivative of vapor density in two-phase region w.r.t. pressure
dDewDensity_dPressure_der_sat	Time derivative of vapor density in two-phase region w.r.t. pressure
bubbleEnthalpy	Specific enthalpy of liquid phase w.r.t. saturation pressure | use setSat_p function for input
dBubbleEnthalpy_dPressure	Derivative of liquid specific enthalpy in two-phase region w.r.t. pressure
dBubbleEnthalpy_dPressure_der_sat	Time derivative of liquid specific enthalpy in two-phase region w.r.t. pressure
dewEnthalpy	Specific enthalpy of vapor phase w.r.t. saturation pressure | use setSat_p function for input
dDewEnthalpy_dPressure	Derivative of vapor specific enthalpy in two-phase region w.r.t. pressure
dDewEnthalpy_dPressure_der_sat	Time derivative of vapor specific enthalpy in two-phase region w.r.t. pressure
dewEntropy	Specific entropy of vapor phase w.r.t. saturation pressure | use setSat_p function for input
dDewEntropy_dPressure	Derivative of vapor specific entropy in two-phase region w.r.t. pressure | use setState_phX function for input
dDewEntropy_dPressure_der_sat	Time derivative of vapor specific entropy in two-phase region w.r.t. pressure | use setState_phX function for input
bubbleEntropy	Specific entropy of liquid phase w.r.t. saturation pressure | use setSat_p function for input
dBubbleEntropy_dPressure	Derivative of liquid specific entropy in two-phase region w.r.t. pressure | use setState_phX function for input
dBubbleEntropy_dPressure_der_sat	Time derivative of liquid specific entropy in two-phase region w.r.t. pressure | use setState_phX function for input
saturationPressure	Saturation pressure w.r.t. temperature
specificHeatCapacityCp	Specific heat capacity at constant pressure | turns infinite in two-phase region! | use setState_phX function for input
specificHeatCapacityCv	Specific heat capacity at constant volume | use setState_phX function for input
dynamicViscosity	Dynamic viscosity w.r.t. temperature and density | use setState_phX function for input
thermalConductivity	Thermal conductivity w.r.t. thermodynamic state | use setState_phX function for input
surfaceTension	Surface tension as a function of temperature (below critical point)
velocityOfSound	Velocity of sound w.r.t. thermodynamic state (only valid for one-phase)
isothermalCompressibility	Isothermal compressibility w.r.t. thermodynamic state (only valid for one-phase)
isobaricExpansionCoefficient	Isobaric expansion coefficient w.r.t. thermodynamic state (only valid for one-phase)
isentropicExponent	Isentropic exponent gamma w.r.t. thermodynamic state | not defined in two-phase region | use setState_phX function for input
specificGibbsEnergy	Specific gibbs energy w.r.t. thermodynamic state
specificHelmholtzEnergy	Helmholtz energy w.r.t. thermodynamic state
density_derh_p	Density derivative by specific enthalpy | use setState_phX function for input
density_derp_h	Density derivative by pressure | use setState_phX function for input
isentropicEnthalpy	Isentropic enthalpy of downstream pressure and upstream thermodynamic state (specific entropy)
derivsOf_ph	Derivatives required for inversion of temperature and density functions
dt_ph	Density and temperature w.r.t. pressure and specific enthalpy
dtofphOnePhase	Density and temperature w.r.t. pressure and specific enthalpy in one-phase region
dtofpsOnePhase	Inverse iteration in one phase region (d,T) = f(p,s)
f_R134a	Calculation of helmholtz derivatives by density and temperature
fid_R134a	Helmholtz coefficients of ideal part
fres_R134a	Calculation of helmholtz derivatives
getPhase_ph	Number of phases by pressure and specific enthalpy
getPhase_ps	Number of phases by pressure and entropy
hofpsTwoPhase	Isentropic specific enthalpy in two phase region h(p,s)
R134a_liqofdT	Properties on liquid boundary phase
R134a_vapofdT	Properties on vapor boundary phase
rho_ph_der	Time derivative function of density_ph
rho_props_ph	Density as function of pressure and specific enthalpy
T_ph_der	Time derivative function of T_ph
T_props_ph	Temperature as function of pressure and specific enthalpy
setSmoothState	Smooth transition function between state_a and state_b
dofpT	Compute d for given p and T
hofpT	Compute h for given p and T
phaseBoundaryAssert	Assert function for checking threshold to phase boundary