Buildings.Templates.ZoneEquipment
Zone equipment
Information
This package contains templates for zone equipment (HVAC terminal units).
Extends from Modelica.Icons.Package (Icon for standard packages).
Package Content
| Name | Description |
|---|---|
 VAVBoxCoolingOnly
|
VAV terminal unit cooling only |
| VAVBoxReheat
|
VAV terminal unit with reheat |
 Components
|
Package with component models |
 Data
|
Records for design and operating parameters |
 Types
|
Package with type definitions |
 Validation
|
Package with validation models |
 Interfaces
|
Interface classes |
Buildings.Templates.ZoneEquipment.VAVBoxCoolingOnly
VAV terminal unit cooling only
Information
Description
This template represents a cooling-only VAV terminal unit (or shut off box).
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 |
|
| 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.
Extends from Buildings.Templates.ZoneEquipment.Interfaces.VAVBox (Interface class for VAV terminal unit).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumHeaWat | Water | HHW medium | |
| VAVBox | dat | redeclare Buildings.Template... | Design and operating parameters |
| Configuration | |||
| Configuration | typ | Buildings.Templates.ZoneEqui... | Type of system |
| VAV damper | |||
| Modulating | damVAV | redeclare inner Buildings.Te... | VAV damper |
| Dynamics | |||
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
| Advanced | |||
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at ports of subcomponents is computed |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_Sup | Supply air from AHU |
| FluidPort_a | port_SupCol | Dual duct cold deck air supply from AHU |
| FluidPort_a | port_SupHot | Dual duct hot deck air supply from AHU |
| FluidPort_b | port_Dis | Discharge air |
| FluidPort_a | port_Ret | Return air |
| FluidPort_a | port_aHeaWat | HHW supply port |
| FluidPort_b | port_bHeaWat | HHW return port |
| Bus | bus | Terminal unit control bus |
Modelica definition
model VAVBoxCoolingOnly "VAV terminal unit cooling only"
extends Buildings.Templates.ZoneEquipment.Interfaces.VAVBox(
final typ=Buildings.Templates.ZoneEquipment.Types.Configuration.VAVBoxCoolingOnly,
redeclare final Buildings.Templates.Components.Coils.None coiHea,
redeclare replaceable Buildings.Templates.ZoneEquipment.Components.Controls.G36VAVBoxCoolingOnly
ctl "Guideline 36 controller for VAV terminal unit cooling only");
end VAVBoxCoolingOnly;
Buildings.Templates.ZoneEquipment.VAVBoxReheat
VAV terminal unit with reheat
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.
Extends from Buildings.Templates.ZoneEquipment.Interfaces.VAVBox (Interface class for VAV terminal unit).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumHeaWat | Water | HHW medium | |
| VAVBox | dat | redeclare Buildings.Template... | Design and operating parameters |
| Configuration | |||
| Configuration | typ | Buildings.Templates.ZoneEqui... | Type of system |
| Heating coil | |||
| WaterBasedHeating | coiHea | redeclare inner Buildings.Te... | Heating coil |
| VAV damper | |||
| Modulating | damVAV | redeclare inner Buildings.Te... | VAV damper |
| Dynamics | |||
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
| Advanced | |||
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at ports of subcomponents is computed |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_Sup | Supply air from AHU |
| FluidPort_a | port_SupCol | Dual duct cold deck air supply from AHU |
| FluidPort_a | port_SupHot | Dual duct hot deck air supply from AHU |
| FluidPort_b | port_Dis | Discharge air |
| FluidPort_a | port_Ret | Return air |
| FluidPort_a | port_aHeaWat | HHW supply port |
| FluidPort_b | port_bHeaWat | HHW return port |
| Bus | bus | Terminal unit control bus |
Modelica definition
model VAVBoxReheat "VAV terminal unit with reheat"
extends Buildings.Templates.ZoneEquipment.Interfaces.VAVBox(
final typ=Buildings.Templates.ZoneEquipment.Types.Configuration.VAVBoxReheat,
redeclare replaceable Buildings.Templates.ZoneEquipment.Components.Controls.G36VAVBoxReheat
ctl
"Guideline 36 controller for VAV terminal unit with reheat");
end VAVBoxReheat;