modelPartialInjectionTwoWay
Partial model of primary variable circuit serving an inversion circuit with two-way valve
Extends from PartialActivePrimary (Partial model of active primary network).
Information
This is a partial model of a variable flow primary loop with a variable speed pump serving an injection circuit with a two-way valve. The primary pump model takes a normalized speed as input. The speed is modulated to track a constant pressure differential at the boundaries of the injection unit. That model is used to construct some example models within Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.HydronicConfigurations.Types.Control | typ (from PartialActivePrimary) | Buildings.Fluid.HydronicConfigurations.Types.Control.Heating | Load type |
| Integer | nTer (from PartialActivePrimary) | 2 | Number of terminal units |
| Real | kSizPum (from PartialActivePrimary) | 1.0 | Pump oversizing coefficient |
| Modelica.Units.SI.Pressure | p_min (from PartialActivePrimary) | 200000 | Circuit minimum pressure |
| Modelica.Units.SI.Temperature | TLiqEnt_nominal (from PartialActivePrimary) | if typ == Buildings.Fluid.HydronicConfigurations.Types.Control.Heating then 60 + 273.15 else 7 + 273.15 | Liquid entering temperature at design conditions |
| Modelica.Units.SI.Temperature | TLiqLvg_nominal (from PartialActivePrimary) | TLiqEnt_nominal + (if typ == Buildings.Fluid.HydronicConfigurations.Types.Control.Heating then -10 else +5) | Liquid leaving temperature at design conditions |
| Modelica.Units.SI.Temperature | TLiqEntChg_nominal (from PartialActivePrimary) | 60 + 273.15 | Liquid entering temperature in change-over mode |
| Modelica.Units.SI.Temperature | TLiqSup_nominal (from PartialActivePrimary) | TLiqEnt_nominal | Liquid primary supply temperature at design conditions |
| Modelica.Units.SI.Temperature | TLiqSupChg_nominal (from PartialActivePrimary) | TLiqEntChg_nominal | Liquid primary supply temperature in change-over mode |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | mTer_flow_nominal (from PartialActivePrimary) | 1 | Terminal unit mass flow rate at design conditions |
| Modelica.Units.SI.MassFlowRate | m1_flow_nominal (from PartialActivePrimary) | m2_flow_nominal | Mass flow rate in primary branch at design conditions |
| Modelica.Units.SI.MassFlowRate | m2_flow_nominal (from PartialActivePrimary) | nTer*mTer_flow_nominal | Mass flow rate in consumer circuit at design conditions |
| Modelica.Units.SI.PressureDifference | dpTer_nominal (from PartialActivePrimary) | 3E4 | Terminal unit pressure drop at design conditions |
| Modelica.Units.SI.PressureDifference | dpPip_nominal (from PartialActivePrimary) | 0.5E4 | Pipe section pressure drop at design conditions |
| Modelica.Units.SI.PressureDifference | dpPum_nominal (from PartialActivePrimary) | Pump head at design conditions | |
| Modelica.Units.SI.MassFlowRate | mPum_flow_nominal (from PartialActivePrimary) | m1_flow_nominal | Primary pump mass flow rate at design conditions |
| Modelica.Units.SI.PressureDifference | dp2_nominal | Consumer circuit pressure differential at design conditions | |
| Dynamics › Conservation equations | |||
| Modelica.Fluid.Types.Dynamics | energyDynamics (from PartialActivePrimary) | Modelica.Fluid.Types.Dynamics.FixedInitial | Type of energy balance: dynamic (3 initialization options) or steady state |
| Configuration | |||
| Boolean | is_bal | false | Set to true for balanced primary branch |
| Controls | |||
| Modelica.Units.SI.PressureDifference | dp1Set | 1e4 | Pressure differential set point |
Components
Revisions
-
June 30, 2022, by Antoine Gautier:
First implementation.