dp_severalGeometryOverall_DP
dp_severalGeometryOverall_MFLOW
dp_severalGeometryOverall_IN_con
dp_severalGeometryOverall_IN_var
Package for pressure loss calculation of valves
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_MFLOW
|
Pressure loss of valve | calculate mass flow rate | 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 |
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_DPPressure loss of valve | calculate pressure loss | several geometries | overall flow regime
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).
| Name | Description |
|---|---|
| Constant inputs | |
| IN_con | Input record for function dp_severalGeometryOverall_DP |
| Variable inputs | |
| IN_var | Input record for function dp_severalGeometryOverall_DP |
| Input | |
| m_flow | Mass flow rate [kg/s] |
| Name | Description |
|---|---|
| DP | Pressure loss [Pa] |
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_MFLOWPressure loss of valve | calculate mass flow rate | several geometries | overall flow regime
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).
| Name | Description |
|---|---|
| Constant inputs | |
| IN_con | Input record for function dp_severalGeometryOverall_MFLOW |
| Variable inputs | |
| IN_var | Input record for function dp_severalGeometryOverall_MFLOW |
| Input | |
| dp | Pressure loss [Pa] |
| Name | Description |
|---|---|
| M_FLOW | Mass flow rate [kg/s] |
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_conInput record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW
Extends from Modelica.Icons.Record (Icon for records).
| Name | Description |
|---|---|
| Valve | |
| geometry | Choice of geometry for valve |
| valveCoefficient | Choice of valve coefficient |
| Av | Av (metric) flow coefficient [Av]=m^2 |
| Kv | Kv (metric) flow coefficient [Kv]=m^3/h |
| Cv | Cv (US) flow coefficient [Cv]=USG/min |
| dp_nominal | Nominal pressure loss [Pa] |
| m_flow_nominal | Nominal mass flow rate [kg/s] |
| rho_nominal | Nominal inlet density [kg/m3] |
| opening_nominal | Nominal opening |
| zeta_TOT_min | Minimal pressure loss coefficient at full opening |
| zeta_TOT_max | Maximum pressure loss coefficient at closed opening |
| Linearisation | |
| dp_small | Linearisation for a pressure loss smaller then dp_small [Pa] |
Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_varInput record for function dp_severalGeometryOverall_DP and dp_severalGeometryOverall_MFLOW
Extends from Modelica.Icons.Record (Icon for records).
| Name | Description |
|---|---|
| Valve | |
| opening | Opening of valve | 0==closed and 1== fully opened |
| Fluid properties | |
| eta | Dynamic viscosity of fluid [Pa.s] |
| rho | Density of fluid [kg/m3] |