modelQuadratic_EN60534_base
Extends from ClaRa.Basics.Icons.Delta_p.
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 | 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 | 10 | Inlet fitting's diameter |
| Real | diameter_valve | 10 | Valve diameter |
| Real | diameter_outlet | 10 | Outlet fitting's diameter |
| Real | x_T | 0.75 | Differential pressure ratio at which choking occurs |
| Valve Characteristics | |||
| Integer | paraOption | 1 | Type of parametrisation |
| Real[:,:] | CL_valve | [0, 0; 1, 1] | Effective apperture as function of valve position in p.u. |
| Real | Kvs_in | 1 | Flow Coefficient at nominal opening (Delta_p_nom = 1e5 Pa, rho_nom=1000 kg/m^3(cold water)) |
| SI.MassFlowRate | m_flow_nom | Kvs_in/1000/3600 | Nominal mass flowrate at full opening |
| SI.Pressure | Delta_p_nom | 1e5 | Nominal pressure difference for Kv definition |
| SI.DensityMassSpecific | rho_in_nom | 1000 | Nominal density for Kv definition |
| Real | zeta | 100 | Pressure Loss coefficient |
| SI.Area | A_cross | 1 | Valve inlet cross section |
| Expert Settings | |||
| SI.Pressure | Delta_p_eps | 100 | Small pressure difference for linearisation around zero flow |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Components.VolumesValvesFittings.Valves.Fundamentals.ICom | iCom | ||
| Boolean | checkValve | ||
| Boolean | useHomotopy | ||
| Real | Kv | Flow Coefficient (Delta_p_nom = 1e5 Pa, rho_nom=1000 kg/m^3(cold water)) | |
| Modelica.Blocks.Tables.CombiTable1Dv | ValveCharacteristics | ||
| SI.PressureDifference | Delta_p | Pressure difference p_in - p_out | |
| Real | aperture_ | Effective apperture | |
| Boolean | normIsValid | Kvs/0.865/diameter_valve^2 < 0.047 | Validity of DIN |
| Real | F_P | 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 | Pressure difference at which choking occurs, always positive i.e. independent of flow direction | |
| Real | Y | Expansion factor | |
| Real | gamma | Heat capacity ratio at actual inlet |
Revisions
For revisions please consult the html-documentation shipped with ClaRa.