Package Modelica.Fluid.Dissipation.PressureLoss.ValvePackage for pressure loss calculation of valves
Package Modelica.Fluid.Dissipation.PressureLoss.Valve
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).
| Name | Description |
|---|---|
dp_severalGeometryOverall_DP | Pressure loss of valve | calculate pressure loss | several geometries | overall flow regime |
dp_severalGeometryOverall_IN_con | Input record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW |
dp_severalGeometryOverall_IN_var | Input record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW |
dp_severalGeometryOverall_MFLOW | Pressure loss of valve | calculate mass flow rate | several geometries | overall flow regime |
Function Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_DP
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).
| Type | Name | Description |
|---|---|---|
dp_severalGeometryOverall_IN_con | IN_con | Input record for function dp_severalGeometryOverall_DP |
dp_severalGeometryOverall_IN_var | IN_var | Input record for function dp_severalGeometryOverall_DP |
MassFlowRate | m_flow | Mass flow rate |
| Type | Name | Description |
|---|---|---|
Pressure | DP | Pressure loss |
Function Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_MFLOW
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).
| Type | Name | Description |
|---|---|---|
dp_severalGeometryOverall_IN_con | IN_con | Input record for function dp_severalGeometryOverall_MFLOW |
dp_severalGeometryOverall_IN_var | IN_var | Input record for function dp_severalGeometryOverall_MFLOW |
Pressure | dp | Pressure loss |
| Type | Name | Description |
|---|---|---|
MassFlowRate | M_FLOW | Mass flow rate |
Record Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_conThis 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).
| Type | Name | Description |
|---|---|---|
ValveGeometry | geometry | Choice of geometry for valve |
ValveCoefficient | valveCoefficient | Choice of valve coefficient |
Real | Av | Av (metric) flow coefficient [Av]=m^2 |
Real | Kv | Kv (metric) flow coefficient [Kv]=m^3/h |
Real | Cv | Cv (US) flow coefficient [Cv]=USG/min |
Pressure | dp_nominal | Nominal pressure loss |
MassFlowRate | m_flow_nominal | Nominal mass flow rate |
Density | rho_nominal | Nominal inlet density |
Real | opening_nominal | Nominal opening |
Real | zeta_TOT_min | Minimal pressure loss coefficient at full opening |
Real | zeta_TOT_max | Maximum pressure loss coefficient at closed opening |
Pressure | dp_small | Linearisation for a pressure loss smaller then dp_small |
Record Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_varThis 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).
| Type | Name | Description |
|---|---|---|
Real | opening | Opening of valve | 0==closed and 1== fully opened |
DynamicViscosity | eta | Dynamic viscosity of fluid |
Density | rho | Density of fluid |