VAV
There are a number of variations on a VAV that are found in buildings. A hierarchy of validation is described here, with a minimum set of requirements that every VAV must meet, as well as a series of finer requirement that describe each variation.
This document currently focuses on validating an entity given a class. A future operating state would better be an iterative validation and classification scheme, where we first classify something as a base VAV, before iterating down to the finest classification shape it satisfies.
Variations
- Base VAV (minimum spec)
- Single Duct
- Single Duct with Reheat
- Dual Duct
- Fan Powered
- Fan Powered Series
- Fan Powered Parallel
- Bypass
- Single Duct
Diagrams
Single Duct
- Single Duct
- Single Duct with Reheat (Elec)
- Single Duct wth Reheat (HHW)
Dual Duct
- Dual Duct
Fan Powered
- Series with Reheat (Elec)
- Series wth Reheat (HHW)
- Parallel with Reheat (Elec)
- Parallel wth Reheat (HHW)
Bypass
- Bypass
Composition
Core
Base VAV
- VAV must have a damper as a direct part.
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
classOrSubClassOf: brick:Damper
]
Single Duct
- Inherits all requirements from Base VAV.
Single Duct with Reheat
- Inherits all requirements from Single Duct VAV.
- VAV must have a subclass of Heating Coil (primarily Hot Water Coil or an Electric Heating Coil).
- Method 1 - subclass of heating coil
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
classOrSubClassOf: brick:Heating_Coil
] - Method 2 - explicit coil type
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
or (
class: brick:Hot_Water_Coil,
class: switch:Electric_Heating_Coil
)
]
- Method 1 - subclass of heating coil
- If VAV has Hot Water Coil, it must also have a Hot Water Valve
THIS IS ON HOLD: We are determining best way to link the Valve to the VAV currently (part or other relationship)
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
classOrSubClassOf: brick:Hot_Water_Valve
]
We can represent this by requiring the VAV to have either:
- Electric Heating Coil
OR - Hot Water Coil AND Hot Water Valve
- Could store this as a subshape (Terminal Unit HHW Heating bundle)
NOTE: Add class switch:Electric_Heating_Coil
Dual Duct
- Inherits all requirements from Base VAV.
- VAV must have 2 dampers as direct parts.
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: qualifiedValuesOfProperties
properties: [
classOrSubClassOf: brick:Damper
]
qualifiers: [
min-count: 2
max-count: 2
]
Fan Powered
- Inherits all requirements from Base VAV.
- VAV must have a Fan as a direct part.
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
classOrSubClassOf: brick:Fan
] - VAV must have a subclass of Heating Coil (primarily Hot Water Coil or an Electric Heating Coil).
- See validation steps described in
Single Duct with Reheat
- See validation steps described in
Fan Powered: Series & Parallel
We do not have an explicit method for determining differences. Technically, we could separate via the fan 'air stream':
- Parallel: Return Fan
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
class: brick:Return_Fan
] - Series: Discharge Fan
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
class: brick:Discharge_Fan
]
Currently we are just using 'Fan'. We can add this validation soon.
Bypass VAV
This is technically the same componentry as the Base VAV. The method for differentiation is the same as for the Series and Parallel boxes - providing a more detailed subclass for the components.
- VAV must have a Bypass Damper
path: brick:hasPart
pathRequirements: [
pathDistance: 1
]
validationType: propertiesOfValues
properties: [
class: brick:Bypass_Damper
]
Switch
Nil
Relationships
A VAV should be fed by some air distribution network or from major airside equipment (AHU, DOAS, MAU).
This is not currently being validated.
Core
Nil
Switch
Nil
Points
{ Rules around points for each variation; must include at least the following: All, Minimum Set}
All
An entity of this type is expected to have a selection of points from this provided list. Any points assigned that are not on this list will throw a warning.
| switch:hasPointName | sh:class |
|---|---|
| Run Command | On_Off_Command |
| Run Status | On_Off_Status |
| Enable Command | Enable_Command |
| Enable Status | Enable_Status |
| Mode | Mode_Status |
| Occupancy Command | Occupancy_Command |
| Occupancy Mode | Occupied_Mode_Status |
| Override Mode | switch:OverrideMode Status |
| Out of Service Status | switch:Maintenance_Mode_Enable_Status |
| Power Supply Status | |
| Fault Mode | Alarm Mode | switch:Fault_Mode_Status |
| Fault Status | Alarm Status | Fault_Status |
| Discharge Air Temperature | Discharge_Air_Temperature_Sensor |
| Discharge Air Temperature Setpoint | Discharge_Air_Temperature_Setpoint |
| Discharge Air Temperature High Limit Setpoint | switch:Discharge_Air_Temperature_High_Limit_Setpoint |
| Discharge Air Temperature Low Limit Setpoint | switch:Discharge_Air_Temperature_Low_Limit_Setpoint |
| Discharge Air Temperature Unnoccupied Cooling Setpoint | switch:Unoccupied Discharge Air Temperature Setpoint |
| Discharge Air Temperature Occupied Cooling Setpoint | switch:Occupied Discharge Air Temperature Setpoint |
| Discharge Air Temperature Occupied Heating Setpoint | switch:Occupied Discharge Air Temperature Heating Setpoint |
| Discharge Air Temperature Unnoccupied Heating Setpoint | switch:Unoccupied Discharge Air Temperature Heating Setpoint |
| Discharge Air Humidity | Discharge_Air_Humidity_Sensor |
| Discharge Air Humidity Setpoint | Discharge_Air_Humidity_Setpoint |
| Discharge Air Absolute Humidity | switch:Discharge_Air_Absolute_Humidity_Sensor |
| Discharge Air Pressure | Discharge_Air_Static_Pressure_Sensor |
| Discharge Air Pressure Setpoint | Discharge_Air_Static_Pressure_Setpoint |
| Discharge Air Pressure High Limit Setpoint | switch:Discharge_Air_Static_Pressure_High_Limit_Setpoint |
| Discharge Air Pressure Low Limit Setpoint | switch:Discharge_Air_Static_Pressure_Low_Limit_Setpoint |
| Discharge Air Velocity Pressure | |
| Discharge Air Dew Point Temperature | Discharge_Air_Dewpoint_Sensor |
| Discharge Air Dew Point Temperature Setpoint | switch:Discharge_Air_Dewpoint_Setpoint |
| Discharge Air Flow | Discharge_Air_Flow_Sensor |
| Discharge Air Flow Setpoint | Discharge_Air_Flow_Setpoint |
| Discharge Air Flow Status | |
| Discharge Air Velocity | switch:Discharge_Air_Velocity_Sensor |
| Discharge Air Flow High Limit Setpoint | switch:Discharge_Air_Flow_High_Limit_Setpoint |
| Discharge Air Flow Low Limit Setpoint | switch:Discharge_Air_Flow_Low_Limit_Setpoint |
| Discharge Air Flow Cooling High Limit Setpoint | switch:Cooling_Discharge_Air_Flow_High_Limit_Setpoint |
| Discharge Air Flow Cooling Low Limit Setpoint | switch:Cooling_Discharge_Air_Flow_Low_Limit_Setpoint |
| Discharge Air Flow Heating High Limit Setpoint | switch:Heating_Discharge_Air_Flow_High_Limit_Setpoint |
| Discharge Air Flow Heating Low Limit Setpoint | switch:Heating_Discharge_Air_Flow_Low_Limit_Setpoint |
| Entering Air Temperature | switch:Entering_Air_Temperature_Sensor |
| Entering Air Dew Point Temperature | |
| Entering Air Dew Point Temperature Setpoint | |
| Entering Air Flow | |
| Entering Air Flow Setpoint | |
| Entering Air Velocity | |
| Max Entering Air Flow Setpoint | |
| Min Entering Air Flow Setpoint | |
| Hot Deck Entering Air Temperature | switch:Entering_Air_Temperature_Sensor |
| Neutral Deck Entering Air Temperature | |
| Cold Deck Entering Air Temperature | |
| Hot Deck Entering Air Flow | switch:Entering_Air_Flow_Sensor |
| Hot Deck Entering Air Flow Setpoint | switch:Entering_Air_Flow_Setpoint |
| Hot Deck Entering Air Flow High Limit Setpoint | |
| Hot Deck Entering Air Flow Low Limit Setpoint | |
| Cold Deck Entering Air Flow | switch:Entering_Air_Flow_Sensor |
| Cold Deck Entering Air Flow Setpoint | switch:Entering_Air_Flow_Setpoint |
| Cold Deck Entering Air Flow High Limit Setpoint | |
| Cold Deck Entering Air Flow Low Limit Setpoint | |
| Neutral Deck Entering Air Flow | |
| Neutral Deck Entering Air Flow Setpoint | |
| Neutral Deck Entering Air Flow High Limit Setpoint | |
| Neutral Deck Entering Air Flow Low Limit Setpoint | |
| Return Air Dew Point Temperature | |
| Return Air Dew Point Temperature Setpoint | |
| Terminal Load | switch:Terminal_Load_Sensor |
| Cooling Load | switch:Cooling_Load_Sensor |
| Heating Load | switch:Heating_Load_Sensor |
| Reheat Enable Command | Auxiliary Heating Enable Command | |
| Reheat Enable Status | Auxiliary Heating Enable Status | |
| Reheat Command | Auxiliary Heating Command | |
| Preheat Enable Command | |
| Preheat Enable Status | |
| Preheat Command | |
| Heating Call | switch:Heating_Call_Status |
| Cooling Call | switch:Cooling_Call_Status |
| Zone Air Temperature | Zone_Air_Temperature_Sensor |
| Zone Air Temperature Setpoint | Zone_Air_Temperature_Setpoint |
| Zone Air Temperature Effective Setpoint | Effective_Zone_Air_Temperature_Setpoint |
| Zone Air Temperature Effective Cooling Setpoint | switch:Cooling_Effective_Zone_Air_Temperature_Setpoint |
| Zone Air Temperature Effective Heating Setpoint | switch:Heating_Effective_Zone_Air_Temperature_Setpoint |
| Zone Air Temperature Occupied Cooling Setpoint | switch:Cooling_Occupied_Zone_Air_Temperature_Setpoint |
| Zone Air Temperature Occupied Heating Setpoint | switch:Zone_Air_Temperature_Occupied_Heating_Setpoint |
| Zone Air Temperature Unoccupied Cooling Setpoint | switch:Zone_Air_Temperature_Unoccupied_Cooling_Setpoint |
| Zone Air Temperature Unoccupied Heating Setpoint | switch:Zone_Air_Temperature_Unoccupied_Heating_Setpoint |
| Zone Air Temperature Standby Cooling Setpoint | |
| Zone Air Temperature Standby Heating Setpoint | |
| Zone Air Humidity | Zone_Air_Humidity_Sensor |
| Zone Air Humidity Setpoint | |
| Zone Air Humidity High Limit Setpoint | |
| Zone Air Humidity Low Limit Setpoint | |
| Zone Air Pressure | |
| Zone Air Pressure Setpoint | |
| Zone Air CO2 | switch:Zone_Air_CO2_Sensor |
| Zone Air CO2 Setpoint | switch:Zone_Air_CO2_Setpoint |
| Zone Air CO | switch:Zone_Air_CO_Sensor |
| Zone Air CO Setpoint | |
| Zone Air NO2 | |
| Zone Air NO2 Setpoint | |
| Zone Air TVOC | |
| Zone Air Radon | |
| Zone Air Temperature Setpoint Deviation | |
| Outside Air Call | switch:Outside_Air_Call_Request_Status |
| AHU Status | switch:AHU_On_Off_Status |
| AHU Call |
Minimum Sets
The minimum selection of points Switch Automation expects to see on an entity of this type.
Base VAV (Minimum Set)
At least one of the following points
| switch:hasPointName | sh:class |
|---|---|
| Run Command | On_Off_Command |
| Run Status | On_Off_Status |
| Enable Command | Enable_Command |
| Enable Status | Enable_Status |
| Mode | Mode_Status |