Modelica.Fluid.Dissipation.PressureLoss.Valve

Package for pressure loss calculation of valves

Information

Valve

Several geometries

Calculation of pressure loss for a valve with different geometries at overall flow regime for incompressible and single-phase fluid flow in dependence of its opening. See more information.

Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).

Package Content

Name Description
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_DP dp_severalGeometryOverall_DP Pressure loss of valve | calculate pressure loss | several geometries | overall flow regime
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_MFLOW dp_severalGeometryOverall_MFLOW Pressure loss of valve | calculate mass flow rate | several geometries | overall flow regime
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_con dp_severalGeometryOverall_IN_con Input record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_var dp_severalGeometryOverall_IN_var Input record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW

Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_DP Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_DP

Pressure loss of valve | calculate pressure loss | several geometries | overall flow regime

Information

Calculation of pressure loss for a valve with different geometries at overall flow regime for incompressible and single-phase fluid flow in dependence of its opening.

Generally this function is numerically best used for the incompressible case , where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated. On the other hand the function dp_severalGeometryOverall_MFLOW is numerically best used for the compressible case if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. See more information.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

NameDescription
Constant inputs
IN_conInput record for function dp_severalGeometryOverall_DP
Variable inputs
IN_varInput record for function dp_severalGeometryOverall_DP
Input
m_flowMass flow rate [kg/s]

Outputs

NameDescription
DPPressure loss [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_MFLOW Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_MFLOW

Pressure loss of valve | calculate mass flow rate | several geometries | overall flow regime

Information

Calculation of pressure loss for a valve with different geometries at overall flow regime for incompressible and single-phase fluid flow in dependence of its opening.

Generally this function is numerically best used for the compressible case , where the pressure loss (dp) is known (out of pressures as state variable) in the used model and the corresponding mass flow rate (M_FLOW) has to be calculated. On the other hand the function dp_severalGeometryOverall_DP is numerically best used for the incompressible case if the mass flow rate (m_flow) is known (as state variable) and the pressure loss (DP) has to be calculated. See more information.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

NameDescription
Constant inputs
IN_conInput record for function dp_severalGeometryOverall_MFLOW
Variable inputs
IN_varInput record for function dp_severalGeometryOverall_MFLOW
Input
dpPressure loss [Pa]

Outputs

NameDescription
M_FLOWMass flow rate [kg/s]

Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_con Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_con

Input record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW

Information

This record is used as input record for the pressure loss function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
Valve
geometryChoice of geometry for valve
valveCoefficientChoice of valve coefficient
AvAv (metric) flow coefficient [Av]=m^2
KvKv (metric) flow coefficient [Kv]=m^3/h
CvCv (US) flow coefficient [Cv]=USG/min
dp_nominalNominal pressure loss [Pa]
m_flow_nominalNominal mass flow rate [kg/s]
rho_nominalNominal inlet density [kg/m3]
opening_nominalNominal opening
zeta_TOT_minMinimal pressure loss coefficient at full opening
zeta_TOT_maxMaximum pressure loss coefficient at closed opening
Linearisation
dp_smallLinearisation for a pressure loss smaller then dp_small [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_var Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_var

Input record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW

Information

This record is used as input record for the pressure loss function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
Valve
openingOpening of valve | 0==closed and 1== fully opened
Fluid properties
etaDynamic viscosity of fluid [Pa.s]
rhoDensity of fluid [kg/m3]
Automatically generated Thu Dec 19 17:20:12 2019.