Defining HVAC Loops

Sun, 23 Mar 2025 00:00:00 +0000
This is an in-progress post and may contain some errors or incomplete information.
Here’s a specific example of a simple HVAC system in 223P:
Expand for Turtle definition of the 223P model
@prefix s223: <http://data.ashrae.org/standard223#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix qudtqk: <http://qudt.org/vocab/quantitykind/> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix ex: <http://example.com/hvac/> .

<http://example.com/hvac> a owl:Ontology ;
 owl:imports <http://data.ashrae.org/standard223/1.0/model/all> .

# Air Handling Unit (AHU) and its connections
ex:AHU a s223:AirHandlingUnit ;
 s223:hasConnectionPoint ex:AHU_Inlet1, ex:AHU_Inlet2;
 s223:hasConnectionPoint ex:AHU_Outlet .

ex:AHU_Inlet1 a s223:InletConnectionPoint ;
 s223:cnx ex:Return_Duct1 ;
 s223:isConnectionPointOf ex:AHU ;
 s223:hasMedium s223:Fluid-Air .

ex:AHU_Inlet2 a s223:InletConnectionPoint ;
 s223:cnx ex:Return_Duct2 ;
 s223:isConnectionPointOf ex:AHU ;
 s223:hasMedium s223:Fluid-Air .

ex:AHU_Outlet a s223:OutletConnectionPoint ;
 s223:cnx ex:Supply_Duct ;
 s223:isConnectionPointOf ex:AHU ;
 s223:hasMedium s223:Fluid-Air .

# Supply Main Duct connections
ex:Supply_Duct a s223:Duct ;
 s223:hasMedium s223:Fluid-Air ;
 s223:cnx ex:AHU_Outlet, ex:VAV1_Inlet, ex:VAV2_Inlet .

# return ducts
ex:Return_Duct1 a s223:Duct ;
 s223:hasMedium s223:Fluid-Air ;
 s223:cnx ex:Room1_Outlet, ex:AHU_Inlet1 .

# VAV 1 and its internal components
ex:VAV1 a s223:SingleDuctTerminal ;
 s223:contains ex:VAV1_Damper, ex:Heating_Coil1 ;
 s223:hasConnectionPoint ex:VAV1_Inlet, ex:VAV1_Outlet .

ex:VAV1_Inlet a s223:InletConnectionPoint ;
 s223:isConnectionPointOf ex:VAV1 ;
 s223:cnx ex:Supply_Duct ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV1_Outlet a s223:OutletConnectionPoint ;
 s223:isConnectionPointOf ex:VAV1 ;
 s223:cnx ex:Supply_Duct ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV1_Damper a s223:Damper ;
 s223:hasConnectionPoint ex:VAV1_Damper_In, ex:VAV1_Damper_Out .

ex:VAV1_Damper_In a s223:InletConnectionPoint ;
 s223:mapsTo ex:VAV1_Inlet ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV1_Damper_Out a s223:OutletConnectionPoint ;
 s223:isConnectionPointOf ex:VAV1_Damper ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV1_Damper_Coil_Duct a s223:Duct ;
 s223:hasMedium s223:Fluid-Air ;
 s223:cnx ex:VAV1_Damper_Out, ex:Heating_Coil1_In .

ex:Heating_Coil1 a s223:HeatingCoil ;
 s223:hasConnectionPoint ex:Heating_Coil1_In, ex:Heating_Coil1_Out .

ex:Heating_Coil1_In a s223:InletConnectionPoint ;
 s223:isConnectionPointOf ex:Heating_Coil1 ;
 s223:hasMedium s223:Fluid-Air .

ex:Heating_Coil1_Out a s223:OutletConnectionPoint ;
 s223:mapsTo ex:VAV1_Outlet ;
 s223:hasMedium s223:Fluid-Air .

# Room 1 and its connection
ex:Room1 a s223:PhysicalSpace ;
 s223:encloses ex:Room1HVAC .

ex:Room1HVAC a s223:DomainSpace ;
 s223:hasDomain s223:Domain-HVAC ;
 s223:hasConnectionPoint ex:Room1_Inlet, ex:Room1_Outlet .

ex:Room1_Inlet a s223:InletConnectionPoint ;
 s223:isConnectionPointOf ex:Room1HVAC ;
 s223:cnx ex:Supply_Duct_Room1 ;
 s223:hasMedium s223:Fluid-Air .

ex:Room1_Outlet a s223:OutletConnectionPoint ;
 s223:isConnectionPointOf ex:Room1HVAC ;
 s223:cnx ex:Return_Duct1 ;
 s223:hasMedium s223:Fluid-Air .

# Supply Duct to Room 1
ex:Supply_Duct_Room1 a s223:Duct ;
 s223:hasMedium s223:Fluid-Air ;
 s223:cnx ex:VAV1_Outlet, ex:Room1_Inlet .

####### VAV 2 

# return ducts
ex:Return_Duct2 a s223:Duct ;
 s223:hasMedium s223:Fluid-Air ;
 s223:cnx ex:Room2_Outlet, ex:AHU_Inlet2 .

# VAV 2 and its internal components
ex:VAV2 a s223:SingleDuctTerminal ;
 s223:contains ex:VAV2_Damper, ex:Heating_Coil2 ;
 s223:hasConnectionPoint ex:VAV2_Inlet, ex:VAV2_Outlet .

ex:VAV2_Inlet a s223:InletConnectionPoint ;
 s223:isConnectionPointOf ex:VAV2 ;
 s223:cnx ex:Supply_Duct ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV2_Outlet a s223:OutletConnectionPoint ;
 s223:isConnectionPointOf ex:VAV2 ;
 s223:cnx ex:Supply_Duct ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV2_Damper a s223:Damper ;
 s223:hasConnectionPoint ex:VAV2_Damper_In, ex:VAV2_Damper_Out .

ex:VAV2_Damper_In a s223:InletConnectionPoint ;
 s223:mapsTo ex:VAV2_Inlet ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV2_Damper_Out a s223:OutletConnectionPoint ;
 s223:isConnectionPointOf ex:VAV2_Damper ;
 s223:hasMedium s223:Fluid-Air .

ex:VAV2_Damper_Coil_Duct a s223:Duct ;
 s223:hasMedium s223:Fluid-Air ;
 s223:cnx ex:VAV2_Damper_Out, ex:Heating_Coil2_In .

ex:Heating_Coil2 a s223:HeatingCoil ;
 s223:hasConnectionPoint ex:Heating_Coil2_In, ex:Heating_Coil2_Out .

ex:Heating_Coil2_In a s223:InletConnectionPoint ;
 s223:isConnectionPointOf ex:Heating_Coil2 ;
 s223:hasMedium s223:Fluid-Air .

ex:Heating_Coil2_Out a s223:OutletConnectionPoint ;
 s223:mapsTo ex:VAV2_Outlet ;
 s223:hasMedium s223:Fluid-Air .

# Room 2 and its connection
ex:Room2 a s223:PhysicalSpace ;
 s223:encloses ex:Room2HVAC .

ex:Room2HVAC a s223:DomainSpace ;
 s223:hasDomain s223:Domain-HVAC ;
 s223:hasConnectionPoint ex:Room2_Inlet, ex:Room2_Outlet .

ex:Room2_Inlet a s223:InletConnectionPoint ;
 s223:isConnectionPointOf ex:Room2HVAC ;
 s223:cnx ex:Supply_Duct_Room2 ;
 s223:hasMedium s223:Fluid-Air .

ex:Room2_Outlet a s223:OutletConnectionPoint ;
 s223:isConnectionPointOf ex:Room2HVAC ;
 s223:cnx ex:Return_Duct2 ;
 s223:hasMedium s223:Fluid-Air .

# Supply Duct to Room 2
ex:Supply_Duct_Room2 a s223:Duct ;
 s223:hasMedium s223:Fluid-Air ;
 s223:cnx ex:VAV2_Outlet, ex:Room2_Inlet .
We are using an RDF representation of the 223P model, meaning we have decomposed the graph into triples of subject predicate object statements. This is significant, because it affects the kinds of traversals and queries we can perform on the model.
223P Loops on Gabe Fierro

Defining HVAC Loops
