modelBypassDampers
Sensible heat recovery wheel with bypass dampers
Extends from Buildings.Fluid.HeatExchangers.ThermalWheels.Sensible.BaseClasses.PartialWheel.
Information
Model of a sensible heat recovery wheel, which consists of a heat exchanger and two dampers to bypass the supply and exhaust airflow, respectively.
This model does not require geometric data. The performance is defined by specifying the part load (75% of the nominal supply flow rate) and nominal sensible heat exchanger effectiveness. This operation of the wheel is configured as follows.
-
If the operating signal
uRot=true,- The wheel power consumption is constant and equal to the nominal value.
- The heat exchange in the heat recovery wheel is adjustable via bypassing supply/exhaust air through the heat exchanger. Accordingly, the sensible heat exchanger effectiveness is calculated with Buildings.Fluid.HeatExchangers.ThermalWheels.Sensible.BaseClasses.Effectiveness.
-
Otherwise,
- The wheel power consumption is 0.
- In addition, there is no heat transfer, i.e., the sensible heat exchanger effectiveness of the heat recovery wheel is 0.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.PressureDifference | dpDamper_nominal | 20 | Nominal pressure drop of dampers |
| Dynamics › Actuator position | |||
| Boolean | use_strokeTime | true | Set to true to continuously open and close damper using strokeTime |
| Modelica.Units.SI.Time | strokeTime | 120 | Time needed to fully open or close actuator |
| Modelica.Blocks.Types.Init | init | Modelica.Blocks.Types.Init.InitialOutput | Type of initialization of dampers (no init/steady state/initial state/initial output) |
| Real | yByp_start | 0 | Initial position of bypass actuators |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | uBypDamPos | Bypass damper position | |
| Buildings.Controls.OBC.CDL.Interfaces.BooleanInput | uRot | True when the wheel is operating | |
| Buildings.Fluid.Actuators.Dampers.Exponential | bypDamSup | Supply air bypass damper | |
| Buildings.Fluid.Actuators.Dampers.Exponential | damSup | Supply air damper | |
| Buildings.Fluid.Actuators.Dampers.Exponential | damExh | Exhaust air damper | |
| Buildings.Fluid.Actuators.Dampers.Exponential | bypDamExh | Exhaust air bypass damper | |
| Buildings.Controls.OBC.CDL.Reals.Switch | swiEpsSen | Switch the heat exchanger effectiveness based on the wheel operation status |
Revisions
-
January 8, 2024, by Sen Huang:
First implementation.