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 |
Pressure 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] |
Pressure 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] |
Input 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] |
Input 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] |