modelPolynomialFlowCoefficient
Extends from BaseClasses.PartialFlowCoefficient.
Information
This model contains calculation procedures for flow coefficients (for more information, please check out AixLib.Fluid.Actuators.Valves.ExpansionValves.BaseClasses.PartialExpansionValve). The calculation procedures based on a polynomial approach and are presented below.
Implemented approaches
Actually, two polynomial approaches are implemented in this package.
To add further calculation procedures, just add its name in
AixLib.Fluid.Actuators.Valves.ExpansionValves.Utilities.Choices
and expand the if-structure.
| Reference | Formula | Refrigerants |
Validity Tcondensing
|
Validity Tevaporating
|
Validity Tsubcooling
|
|---|---|---|---|---|---|
| ShanweiEtAl2005 |
C = a1*A + a2*ρinlet + a3*ρoutlet
+ a4*Tsubcooling + a5*dclearance +
a6*(pinlet- poutlet)
|
R22, R407C, R410A
|
40 - 50 °C
|
0 - 10 °C
|
1.5 - 10 °C
|
| Li2013 |
C = a1 + a2*opening + a3*opening^2 +
a4*opening*(Tsubcooling/Tcrit) +
a5*(Tsubcooling/Tcrit) +
a6*(Tsubcooling/Tcrit)^2
|
R22, R407C, R410A
|
30 - 50 °C
|
0 - 30 °C
|
1.5 - 15 °C
|
References
M. Shanwei, Z. Chuan, C. Jiangping and C. Zhiujiu. (2005): Experimental research on refrigerant mass flow coefficient of electronic expansion valve. In: Applied Thermal Engineering 25(14), S. 2351–2366
Li, W. (2013): Simplified modeling analysis ofmass flow characteristics in electronic expansion valve. In: Applied Thermal Engineering 53(1), S. 8–12
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelling approach | |||
| Types.PolynomialModels | polyMod | Types.PolynomialModels.ShanweiEtAl2005 | Chose predefined polynomial model for flow coefficient |
| Real[:] | a | Multiplication factors for each summand | |
| Real[:] | b | Exponents for each summand | |
| Integer | nT | size(a, 1) | Number of terms used for the calculation procedure |
| Further geometry data | |||
| Modelica.Units.SI.Diameter | dCle | 0.02e-3 | Clearance diameter dCle = d_inner - d_needle |
| Real | pDifRat | 0.84 | Pressure differential ratio factor depending on valve moddeld |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real[nT] | P | Array that contains all coefficients used for the calculation procedure | |
| Real | corFact | Corraction factor used to correct flow coefficient |
Revisions
- October 16, 2017, by Mirko Engelpracht, Christian Vering:
First implementation (see issue 457).