modelSingleMixing
Extends from BaseClasses.PartialPassivePrimary (Partial model of passive primary network).
Information
This model represents a change-over system where the configuration Buildings.Fluid.HydronicConfigurations.PassiveNetworks.SingleMixing serves as the interface between a variable flow primary circuit at constant supply temperature and two consumer circuits: the first one is a constant flow circuit, the second one is a variable flow circuit. For each circuit, the secondary supply temperature is reset with an open loop, representing for instance a reset logic based on the outdoor air temperature. The pump model for the second circuit is an ideal Δp-controlled model, its input being computed to mimic the tracking of a pressure differential at the boundaries of the terminal unit.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.HydronicConfigurations.Types.Control | typ (from PartialPassivePrimary) | Load type | |
| Integer | nTer (from PartialPassivePrimary) | 2 | Number of terminal units |
| Modelica.Units.SI.Pressure | p_min (from PartialPassivePrimary) | 200000 | Circuit minimum pressure |
| Modelica.Units.SI.Temperature | TLiqEnt_nominal (from PartialPassivePrimary) | 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 PartialPassivePrimary) | 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 PartialPassivePrimary) | 60 + 273.15 | Liquid entering temperature in change-over mode |
| Modelica.Units.SI.Temperature | TLiqSup_nominal (from PartialPassivePrimary) | TLiqEnt_nominal | Liquid primary supply temperature at design conditions |
| Modelica.Units.SI.Temperature | TLiqSupChg_nominal (from PartialPassivePrimary) | TLiqEntChg_nominal | Liquid primary supply temperature in change-over mode |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | mTer_flow_nominal (from PartialPassivePrimary) | 1 | Terminal unit mass flow rate at design conditions |
| Modelica.Units.SI.MassFlowRate | m1_flow_nominal (from PartialPassivePrimary) | nTer*mTer_flow_nominal | Mass flow rate in primary circuit at design conditions |
| Modelica.Units.SI.PressureDifference | dpTer_nominal (from PartialPassivePrimary) | 3E4 | Terminal unit pressure drop at design conditions |
| Modelica.Units.SI.PressureDifference | dpPip_nominal (from PartialPassivePrimary) | 0.5E4 | Pipe section pressure drop at design conditions |
| Dynamics › Conservation equations | |||
| Modelica.Fluid.Types.Dynamics | energyDynamics (from PartialPassivePrimary) | Modelica.Fluid.Types.Dynamics.FixedInitial | Type of energy balance: dynamic (3 initialization options) or steady state |
| Controls | |||
| Modelica.Units.SI.PressureDifference | dp2Set | loa1.dpTer_nominal + loa1.dpValve_nominal | Secondary pressure differential set point |
Components
Revisions
-
June 30, 2022, by Antoine Gautier:
First implementation.