modelQuadratic_EN60534_compressible
Extends from ClaRa.Components.VolumesValvesFittings.Valves.Fundamentals.GenericPressureLoss, ClaRa.Components.VolumesValvesFittings.Valves.Fundamentals.Quadratic_EN60534_base (Quadratic|Kv definition | supercritical flow | compressible |EN60534).
Information
For detailed model documentation please consult the html-documentation shipped with ClaRa.
Authorship and Copyright Statement for original (initial) Contribution
Author:
DYNCAP/DYNSTART development team, Copyright © 2011-2024.References:
For references please consult the html-documentation shipped with ClaRa.
Remarks:
This component was developed by ClaRa development team under the 3-clause BSD License.
Acknowledgements:ClaRa originated from the collaborative research projects DYNCAP and DYNSTART. Both research projects were supported by the German Federal Ministry for Economic Affairs and Energy (FKZ 03ET2009 and FKZ 03ET7060).
CLA:
The author(s) have agreed to ClaRa CLA, version 1.0. See https://claralib.com/pdf/CLA.pdf
By agreeing to ClaRa CLA, version 1.0 the author has granted the ClaRa development team a permanent right to use and modify his initial contribution as well as to publish it or its modified versions under the 3-clause BSD License.
The ClaRa development team consists of the following partners:
TLK-Thermo GmbH (Braunschweig, Germany)
XRG Simulation GmbH (Hamburg, Germany).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | Kvs (from Quadratic_EN60534_base) | if paraOption == 1 then Kvs_in else if paraOption == 2 then 3600*m_flow_nom/rho_in_nom*sqrt(rho_in_nom/1000*1e5/Delta_p_nom) else A_cross*sqrt(2/zeta)*sqrt(1e5/1000)*3600 | Actual value of Kvs_in depending on parametrisation option |
| Valve Geometry | |||
| Real | diameter_inlet (from Quadratic_EN60534_base) | 10 | Inlet fitting's diameter |
| Real | diameter_valve (from Quadratic_EN60534_base) | 10 | Valve diameter |
| Real | diameter_outlet (from Quadratic_EN60534_base) | 10 | Outlet fitting's diameter |
| Real | x_T (from Quadratic_EN60534_base) | 0.75 | Differential pressure ratio at which choking occurs |
| Valve Characteristics | |||
| Integer | paraOption (from Quadratic_EN60534_base) | 1 | Type of parametrisation |
| Real[:,:] | CL_valve (from Quadratic_EN60534_base) | [0, 0; 1, 1] | Effective apperture as function of valve position in p.u. |
| Real | Kvs_in (from Quadratic_EN60534_base) | 1 | Flow Coefficient at nominal opening (Delta_p_nom = 1e5 Pa, rho_nom=1000 kg/m^3(cold water)) |
| SI.MassFlowRate | m_flow_nom (from Quadratic_EN60534_base) | Kvs_in/1000/3600 | Nominal mass flowrate at full opening |
| SI.Pressure | Delta_p_nom (from Quadratic_EN60534_base) | 1e5 | Nominal pressure difference for Kv definition |
| SI.DensityMassSpecific | rho_in_nom (from Quadratic_EN60534_base) | 1000 | Nominal density for Kv definition |
| Real | zeta (from Quadratic_EN60534_base) | 100 | Pressure Loss coefficient |
| SI.Area | A_cross (from Quadratic_EN60534_base) | 1 | Valve inlet cross section |
| Expert Settings | |||
| SI.Pressure | Delta_p_eps (from Quadratic_EN60534_base) | 100 | Small pressure difference for linearisation around zero flow |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | checkValve (from GenericPressureLoss) | ||
| Boolean | useHomotopy (from GenericPressureLoss) | ||
| Basics.Units.MassFlowRate | m_flow (from GenericPressureLoss) | ||
| Real | flowIsChoked (from GenericPressureLoss) | 1 if flow is choked, 0 if not | |
| Real | PR_choked (from GenericPressureLoss) | Pressure ratio at which choking occurs | |
| ClaRa.Components.VolumesValvesFittings.Valves.Fundamentals.ICom | iCom (from Quadratic_EN60534_base) | ||
| Real | Kv (from Quadratic_EN60534_base) | Flow Coefficient (Delta_p_nom = 1e5 Pa, rho_nom=1000 kg/m^3(cold water)) | |
| Modelica.Blocks.Tables.CombiTable1Dv | ValveCharacteristics (from Quadratic_EN60534_base) | ||
| SI.PressureDifference | Delta_p (from Quadratic_EN60534_base) | Pressure difference p_in - p_out | |
| Real | aperture_ (from Quadratic_EN60534_base) | Effective apperture | |
| Boolean | normIsValid (from Quadratic_EN60534_base) | Kvs/0.865/diameter_valve^2 < 0.047 | Validity of DIN |
| Real | F_P (from Quadratic_EN60534_base) | 1/sqrt(1 + (((1 - diameter_valve^4/diameter_inlet^4) - (1 - diameter_valve^4/diameter_outlet^4) + 0.5*(1 - (diameter_valve/diameter_inlet)^2)^2 + (1 - (diameter_valve/diameter_outlet)^2)^2)*Kv^2/diameter_valve^4)/K1) | Pipe geometry correction factor |
| SI.Pressure | Delta_p_choke (from Quadratic_EN60534_base) | Pressure difference at which choking occurs, always positive i.e. independent of flow direction | |
| Real | Y (from Quadratic_EN60534_base) | Expansion factor | |
| Real | gamma (from Quadratic_EN60534_base) | Heat capacity ratio at actual inlet |
Revisions
For revisions please consult the html-documentation shipped with ClaRa.