modelPoly_R134a_169_Reciprocating
Reciporating Compressor - R134a - 169 cm³ - Polynomial
Extends from PolynomialVolumetricEfficiency (Model describing volumetric efficiency based on polynomial approach).
Information
This model contains a calculation procedure for the isentropic
efficiency presented by Darr and Crawford (1992).
| Reference | Formula | Refrigerants |
Validity ncompressor
|
Validity Πpressure
|
|---|---|---|---|---|
| DarrAndCrawford1992 |
ηvol = a1 + a2*n -
a3*epsRef*(ρinlIse/ρinl-1) -
a4*n*(ρinlIse/ρinl-1)
|
R134a |
40 - 75
|
3 - 10
|
References
J.H. Darr and R.R. Crawford (1992): Modeling of an Automotive Air Conditioning Compressor Based on Experimental Data: ACRC Technical Report 14. Publisher: Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelling approach | |||
| Types.VolumetricPolynomialModels | polyMod (from PolynomialVolumetricEfficiency) | Types.VolumetricPolynomialModels.Karlsson2007 | Chose predefined polynomial model for flow coefficient |
| Real[:] | a (from PolynomialVolumetricEfficiency) | Multiplication factors for each summand | |
| Real[:] | b (from PolynomialVolumetricEfficiency) | Exponents for each summand | |
| Integer | nT (from PolynomialVolumetricEfficiency) | size(a, 1) | Number of terms used for the calculation procedure |
| Real[:] | c (from PolynomialVolumetricEfficiency) | {1} | Coefficients used for correction factors if needed |
| Reference properties | |||
| Modelica.Units.SI.Frequency | rotSpeRef (from PolynomialVolumetricEfficiency) | 9.334 | Reference rotational speed |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Efficiency | epsRef (from PartialEfficiency) | Ratio of the real and the ideal displacement volume | |
| Modelica.Units.SI.Volume | VDis (from PartialEfficiency) | Displacement volume | |
| Real | piPre (from PartialEfficiency) | Ratio of compressor's outlet and inlet pressure | |
| Modelica.Units.SI.Frequency | rotSpe (from PartialEfficiency) | Compressor's current rotational speed | |
| Medium.ThermodynamicState | staInl (from PartialEfficiency) | Thermodynamic state at compressor's inlet | |
| Medium.ThermodynamicState | staOut (from PartialEfficiency) | Thermodynamic state at compressor's outlet | |
| Modelica.Units.SI.Temperature | TAmb (from PartialEfficiency) | Ambient temperature | |
| Modelica.Units.SI.Efficiency | lamH (from PartialVolumetricEfficiency) | Overall volumetric efficiency | |
| Real[nT] | p (from PolynomialVolumetricEfficiency) | Array that contains all coefficients used for the calculation procedure | |
| Real[2] | corFac (from PolynomialVolumetricEfficiency) | Array of correction factors used if efficiency model proposed in literature differs from efficiency model defined in PartialCompressor model |
Revisions
- October 23, 2017, by Mirko Engelpracht:
First implementation (see issue 467).