modelVAVBoxReheat
VAV terminal unit with reheat
Extends from Buildings.Templates.ZoneEquipment.Interfaces.VAVBox (Interface class for VAV terminal unit).
Information
Description
This template represents a VAV terminal unit with reheat.
The possible configuration options are enumerated in the table below.
The user may refer to ASHRAE (2021) for further details.
The first option displayed in bold characters corresponds to the default configuration.
| Configuration parameter | Options | Notes |
|---|---|---|
| VAV damper | Modulating damper | |
| Reheat coil |
Hot water coil with two-way valve Modulating electric heating coil |
|
| Controller | ASHRAE Guideline 36 controller | An open loop controller is also available for validation purposes only. |
References
- ASHRAE, 2021. Guideline 36-2021, High-Performance Sequences of Operation for HVAC Systems. Atlanta, GA.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Templates.ZoneEquipment.Configuration.PartialAirTerminal | cfg (from PartialAirTerminal) | Configuration parameters | |
| Buildings.Templates.ZoneEquipment.Data.PartialAirTerminal | dat (from PartialAirTerminal) | Design and operating parameters | |
| Configuration | |||
| Buildings.Templates.ZoneEquipment.Types.Configuration | typ (from PartialAirTerminal) | Type of system | |
| String | id (from PartialAirTerminal) | dat.id | System tag |
| Boolean | have_souChiWat (from PartialAirTerminal) | Set to true if system uses CHW | |
| Boolean | have_souHeaWat (from PartialAirTerminal) | Set to true if system uses HHW | |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | mAir_flow_nominal (from PartialAirTerminal) | dat.mAir_flow_nominal | Discharge air mass flow rate |
| Modelica.Units.SI.MassFlowRate | mAirPri_flow_nominal (from PartialAirTerminal) | Primary air mass flow rate | |
| Modelica.Units.SI.MassFlowRate | mChiWat_flow_nominal (from PartialAirTerminal) | Total CHW mass flow rate | |
| Modelica.Units.SI.MassFlowRate | mHeaWat_flow_nominal (from PartialAirTerminal) | Total HHW mass flow rate | |
| Modelica.Units.SI.HeatFlowRate | QChiWat_flow_nominal (from PartialAirTerminal) | Total CHW heat flow rate | |
| Modelica.Units.SI.HeatFlowRate | QHeaWat_flow_nominal (from PartialAirTerminal) | Total HHW heat flow rate | |
| Dynamics › Conservation equations | |||
| Modelica.Fluid.Types.Dynamics | energyDynamics (from PartialAirTerminal) | Modelica.Fluid.Types.Dynamics.DynamicFreeInitial | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalAir (from PartialAirTerminal) | true | = true to allow flow reversal, false restricts to design direction - Air side |
| Boolean | allowFlowReversalLiq (from PartialAirTerminal) | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
| Advanced › Diagnostics | |||
| Boolean | show_T (from PartialAirTerminal) | false | = true, if actual temperature at ports of subcomponents is computed |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.FluidPort_a | port_Sup (from PartialAirTerminal) | Supply air from AHU | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_SupCol (from PartialAirTerminal) | Dual duct cold deck air supply from AHU | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_SupHot (from PartialAirTerminal) | Dual duct hot deck air supply from AHU | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_Dis (from PartialAirTerminal) | Discharge air | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_Ret (from PartialAirTerminal) | Return air | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_aHeaWat (from PartialAirTerminal) | HHW supply port | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_bHeaWat (from PartialAirTerminal) | HHW return port | |
| Buildings.Templates.ZoneEquipment.Interfaces.Bus | bus (from PartialAirTerminal) | Terminal unit control bus |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Templates.Components.Coils.WaterBasedHeating | coiHea (from VAVBox) | ||
| Buildings.Templates.Components.Actuators.Damper | damVAV (from VAVBox) | VAV damper | |
| Buildings.Templates.ZoneEquipment.Components.Controls.OpenLoop | ctl (from VAVBox) | ||
| Buildings.Templates.Components.Sensors.Temperature | TAirDis (from VAVBox) | Discharge air temperature sensor | |
| Buildings.Templates.Components.Sensors.VolumeFlowRate | VAirDis_flow (from VAVBox) | Airflow sensor |
Revisions
-
February 11, 2022, by Antoine Gautier:
First implementation.