Modelica.Fluid.Dissipation.PressureLoss.Valve

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.

Package Content

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_DP

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.

Inputs

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]

Outputs

Name	Description
DP	Pressure loss [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_MFLOW

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.

Inputs

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]

Outputs

Name	Description
M_FLOW	Mass flow rate [kg/s]

Modelica.Fluid.Dissipation.PressureLoss.Valve.dp_severalGeometryOverall_IN_con

Information

Parameters

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_var

Information

Parameters

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]