AixLib.Media.Refrigerants.R290.R290_IIR_P05_30_T263_343_Formula

# .AixLib.Media.Refrigerants.R290.R290_IIR_P05_30_T263_343_Formula

Refrigerant model for R290 using a hybrid approach with explicit formulas developed by Sangi et al.

## Information

This package provides a refrigerant model for R290 using a hybrid approach developed by Sangi et al.. The hybrid approach is implemented in AixLib.Media.Refrigerants.Interfaces.PartialHybridTwoPhaseMediumRecord and the refrigerant model is implemented by complete the template AixLib.Media.Refrigerants.Interfaces.TemplateHybridTwoPhaseMediumRecord .

#### Assumptions and limitations

The implemented coefficients are fitted to external data by Sangi et al. and are valid within the following range:

"Range of validiry" cellspacing="0" cellpadding="2" border="1" width="30%" style="border-collapse:collapse;">

Parameter | Minimum Value | Maximum Value
Pressure (p) in bar | 0.5 | 30
Temperature (T) in K | 263.15 | 343.15

#### Validation

Sangi et al. validated their model by comparing it to results obtained from the Helmholtz equation of state. They found out that relative error of the refrigerant model compared to HelmholtzMedia (Thorade and Saadat, 2012) is close to zero.

#### References

Thorade, Matthis; Saadat, Ali (2012): HelmholtzMedia - A fluid properties library. In: Proceedings of the 9th International Modelica Conference; September 3-5; 2012; Munich; Germany. Linköping University Electronic Press, S. 63–70.

Sangi, Roozbeh; Jahangiri, Pooyan; Klasing, Freerk; Streblow, Rita; Müller, Dirk (2014): A Medium Model for the Refrigerant Propane for Fast and Accurate Dynamic Simulations. In: The 10th International Modelica Conference. Lund, Sweden, March 10-12, 2014: Linköping University Electronic Press (Linköping Electronic Conference Proceedings), S. 1271–1275

Klasing,Freerk: A New Design for Direct Exchange Geothermal Heat Pumps - Modeling, Simulation and Exergy Analysis. Master thesis

Scalabrin, G.; Marchi, P.; Span, R. (2006): A Reference Multiparameter Viscosity Equation for Propane with an Optimized Functional Form. In: J. Phys. Chem. Ref. Data, Vol. 35, No. 3, S. 1415-1442

## Contents

Name | Description
--- | ---
SmoothTransition | Record that contains ranges to calculate a smooth transition between different regions
f_Idg | Dimensionless Helmholtz energy (Ideal gas contribution alpha_0)
f_Res | Dimensionless Helmholtz energy (Residual part alpha_r)
t_fIdg_t | Short form for tau*(dalpha_0/dtau)_delta=const
tt_fIdg_tt | Short form for tau*tau*(ddalpha_0/(dtau*dtau))_delta=const
t_fRes_t | Short form for tau*(dalpha_r/dtau)_delta=const
tt_fRes_tt | Short form for tau*tau*(ddalpha_r/(dtau*dtau))_delta=const
d_fRes_d | Short form for delta*(dalpha_r/(ddelta))_tau=const
dd_fRes_dd | Short form for delta*delta(ddalpha_r/(ddelta*delta))_tau=const
td_fRes_td | Short form for tau*delta*(ddalpha_r/(dtau*ddelta))
ttt_fIdg_ttt | Short form for tau*tau*tau*(dddalpha_0/(dtau*dtau*dtau))_delta=const
ttt_fRes_ttt | Short form for tau*tau*tau*(dddalpha_r/(dtau*dtau*dtau))_delta=const
ddd_fRes_ddd | Short form for delta*delta*delta* (dddalpha_r/(ddelta*ddelta*ddelta))_tau=const
tdd_fRes_tdd | Short form for tau*delta*delta*(dddalpha_r/(dtau*ddelta*ddelta))
ttd_fRes_ttd | Short form for tau*tau*delta*(dddalpha_r/(dtau*dtau*ddelta))
saturationPressure | Saturation pressure of refrigerant (Ancillary equation)
saturationTemperature | Saturation temperature of refrigerant (Ancillary equation)
bubbleDensity | Boiling curve specific density of refrigerant (Ancillary equation)
dewDensity | Dew curve specific density of refrigerant (Ancillary equation)
bubbleEnthalpy | Boiling curve specific enthalpy of refrigerant (Ancillary equation)
dewEnthalpy | Dew curve specific enthalpy of refrigerant (Ancillary equation)
bubbleEntropy | Boiling curve specific entropy of refrigerant (Ancillary equation)
dewEntropy | Dew curve specific entropy of propane (Ancillary equation)
temperature_ph | Calculates temperature as function of pressure and specific enthalpy
temperature_ps | Calculates temperature as function of pressure and specific entroy
density_pT | Computes density as a function of pressure and temperature
dynamicViscosity | Calculates dynamic viscosity of refrigerant
thermalConductivity | Calculates thermal conductivity of refrigerant
surfaceTension | Surface tension in two phase region of refrigerant

## Revisions

- June 12, 2017, by Mirko Engelpracht, Christian Vering:
  First implementation (see issue 408).

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