modelInjectionThreeWay
Extends from BaseClasses.PartialActivePrimary.
Information
This model represents a heating system where the configuration Buildings.Fluid.HydronicConfigurations.ActiveNetworks.InjectionThreeWay serves as the interface between a constant flow primary circuit at constant supply temperature and a constant flow secondary circuit at variable supply temperature. The secondary supply temperature is reset with an open loop, representing for instance a reset logic based on the outdoor air temperature. Two identical terminal units are served by the secondary circuit. Each terminal unit has its own hourly load profile.
The primary side of the injection circuit is balanced at design conditions
if kSizBal=1.
Selecting a lower value of the parameter kSizBal illustrates
the operation with an oversized balancing valve, yielding
a lower pressure drop.
One can observe the degraded ΔT (plot #6) and elevated mass flow rate
(plot #7) in the primary circuit.
However, the operation of the consumer circuit is not disturbed:
the set point and the loads are met.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Configuration | |||
| Real | kSizBal | 0.5 | Sizing factor for primary balancing valve (1 means balanced) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.HydronicConfigurations.ActiveNetworks.InjectionThreeWay | con | Hydronic connection | |
| Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.BaseClasses.LoadThreeWayValveControl | loa | Load | |
| Buildings.Controls.OBC.CDL.Reals.Sources.TimeTable | fraLoa | Load modulating signal | |
| Buildings.Fluid.HydronicConfigurations.ActiveNetworks.Examples.BaseClasses.LoadThreeWayValveControl | loa1 | Load | |
| Sensors.RelativePressure | dp | Differential pressure | |
| FixedResistances.PressureDrop | res2 | Pipe pressure drop | |
| Buildings.Controls.OBC.CDL.Integers.Sources.TimeTable | mode | Operating mode (time schedule) | |
| Buildings.Controls.OBC.CDL.Reals.Sources.TimeTable | setOff | Offset applied to design supply temperature to compute set point | |
| Buildings.Controls.OBC.CDL.Reals.AddParameter | T2Set | Consumer circuit temperature set point | |
| Buildings.Controls.OBC.CDL.Integers.GreaterThreshold | isEna | Returns true if enabled |
Revisions
-
June 30, 2022, by Antoine Gautier:
First implementation.