modelCommissioningDamper
Information
This components computes the (Metric) flow coefficient Kv that insures the mass flow rate m_flow_nominal through the damper at the initialisation if m_flow(fixed=true) enabled.
The flow coefficient Kv derives from the ISA-75.01.01-2007 standard for a compressible valve sizing (see PartialDamper).
dp_ref is used to compute Kv. To be consistent with standard, it should be kept to 1e5 Pa but could be modified by user to have more meaningfull Kv for HVAC application (order of magnitude of pressure drop across damper is 100 Pa)
Reference temperature is used to compute reference density (for water 1000 kg/m3 reference density is used). atmospheric pressure is used to compute reference density (medium default pressure)
Pressure drop across the damper is generally computed at initialization and derived from boundary condition;
- To avoid numerical singularities, the flow characteristic is modified for pressure drops less than
dp_small. The default value is 1 Pa but should be adjusted if required
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | Kv | (Metric) flow coefficient | |
| Real | Fxt | 0.5 | F_gamma*xt critical ratio |
| Nominal operating point | |||
| Medium.MassFlowRate | m_flow_nominal | Nominal mass flow rate targeted | |
| Modelica.SIunits.Pressure | dp_ref | 1e5 | Reference pressure drop (Standard states 1e5 Pa ) |
| Modelica.SIunits.Temperature | T_ref | 293.15 | reference temperature used for computed Kv |
| Modelica.SIunits.Density | rho_ref | Medium.density_pTX(Medium.p_default, T_ref, Medium.X_default) | |
| Advanced | |||
| Modelica.SIunits.Pressure | dp_small | 1 | Regularisation of zero flow |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.FluidPort_b | port_b | ||
| Modelica.Fluid.Interfaces.FluidPort_a | port_a |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.SIunits.Pressure | dp | Pressure difference between port_a and port_b (= port_a.p - port_b.p) | |
| Medium.MassFlowRate | m_flow | Mass flow rate in design flow direction |
Contents
| Name | Description |
|---|---|
 Medium | Medium in the component |