modelVAVReheatBox
Supply box of a VAV system with a hot water reheat coil
Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).
Information
Model for a VAV terminal box with a water reheat coil and exponential damper.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | allowFlowReversal | true | = false to simplify equations, assuming, but not enforcing, no flow reversal |
| Modelica.Units.SI.MassFlowRate | mCooAir_flow_nominal | Nominal air mass flow rate from cooling sizing calculations | |
| Modelica.Units.SI.MassFlowRate | mHeaAir_flow_nominal | Nominal air mass flow rate from heating sizing calculations | |
| Modelica.Units.SI.MassFlowRate | mHeaWat_flow_nominal | QHea_flow_nominal/(cpWatLiq*(THeaWatInl_nominal - THeaWatOut_nominal)) | Nominal mass flow rate of hot water to reheat coil |
| Modelica.Units.SI.Volume | VRoo | Room volume | |
| Modelica.Units.SI.Temperature | THeaWatInl_nominal | Reheat coil nominal inlet water temperature | |
| Modelica.Units.SI.Temperature | THeaWatOut_nominal | Reheat coil nominal outlet water temperature | |
| Modelica.Units.SI.Temperature | THeaAirInl_nominal | Inlet air nominal temperature into VAV box during heating | |
| Modelica.Units.SI.Temperature | THeaAirDis_nominal | Discharge air temperature from VAV box during heating | |
| Modelica.Units.SI.HeatFlowRate | QHea_flow_nominal | mHeaAir_flow_nominal*cpAir*(THeaAirDis_nominal - THeaAirInl_nominal) | Nominal heating heat flow rate |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.FluidPort_a | port_aAir | Fluid connector a1 (positive design flow direction is from port_a1 to port_b1) | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_bAir | Fluid connector b (positive design flow direction is from port_a1 to port_b1) | |
| Modelica.Blocks.Interfaces.RealInput | yVAV | Signal for VAV damper | |
| Modelica.Blocks.Interfaces.RealOutput | y_actual | Actual VAV damper position | |
| Modelica.Blocks.Interfaces.RealOutput | yVal_actual | Actual valve position | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_aHeaWat | Hot water inlet port | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_bHeaWat | Hot water outlet port | |
| Modelica.Blocks.Interfaces.RealOutput | TSup | Supply Air Temperature | |
| Modelica.Blocks.Interfaces.RealOutput | VSup_flow | Supply Air Volumetric Flow Rate | |
| Modelica.Blocks.Interfaces.RealInput | yHea | Actuator position for heating valve (0: closed, 1: open) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.Actuators.Dampers.Exponential | vav | VAV box for room | |
| Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU | terHea | Reheat coil | |
| Fluid.Sensors.TemperatureTwoPort | senTem | Supply air temperature sensor | |
| Fluid.Sensors.VolumeFlowRate | senVolFlo | Supply air volumetric flow rate sensor | |
| Fluid.Actuators.Valves.TwoWayEqualPercentage | val | Valve for terminal heater | |
| Real | ACH | VSup_flow/VRoo*3600 | Air changes per hour |
Contents
| Name | Description |
|---|---|
 MediumA | Medium model for air |
| MediumW | Medium model for water |
Revisions
-
January 27, 2023, by Jianjun Hu:
Changed the pressure independent damper to exponential damper. This is for issue #3139. -
December 20, 2021, by Michael Wetter:
Changed parameter declarations for issue #2829. -
August 24, 2021, by Michael Wetter:
Changed model to include the hydraulic configurations of the cooling coil, heating coil and VAV terminal box.
This is for issue #2594. -
February 12, 2021, by Baptiste Ravache:
First implementation, based on Buildings.Obsolete.Examples.VAVReheat.BaseClasses.VAVBranch
This is for #2024.