I am modeling some multifamily housing with a common attic and all ducts running through the attic. Each individual unit is served by its own heatpump, but there's a DOAS system with ERV that is common to all the units. So for every residence, there is one AirLoop that delivers hot or cold air, and for all the residences there is one AirLoop that delivers outdoor air running continuously.
I've started implementing one heatpump AirLoop and the DOAS AirLoop serving only one zone. I think I've set up the AirLoops and AFNs correctly but I'm getting an error.
** Severe ** ValidateDistributionSystem: Primary Air Loop Node is not found in AIRFLOWNETWORK:DISTRIBUTION:NODE = AFN UNIT3 DOAS ZONE SPLITTER
** Severe ** ValidateDistributionSystem: Primary Air Loop Node is not found in AIRFLOWNETWORK:DISTRIBUTION:NODE = AFN UNIT3 DOAS ZONE MIXER
** Severe ** The AirLoopNum defined in both AIRFLOWNETWORK:DISTRIBUTION:NODE objects in AFN UNIT3 DOAS ZONE INLET ZONE NODE LINKAGE are not the same. Please make sure both nodes should be listed in the same AirLoop as a valid linkage.
** ~~~ ** AirLoop defined in AFN UNIT3_ZONE DOAS SUPPLY INLET is UNIT3 DOAS, and AirLoop defined in UNIT3_ZONE is SYS UNIT3_ZONE GROUP
** Severe ** The AirLoopNum defined in both AIRFLOWNETWORK:DISTRIBUTION:NODE objects in AFN UNIT3 DOAS ZONE NODE ZONE RETURN LINKAGE are not the same. Please make sure both nodes should be listed in the same AirLoop as a valid linkage.
** ~~~ ** AirLoop defined in UNIT3_ZONE is SYS UNIT3_ZONE GROUP, and AirLoop defined in AFN UNIT3_ZONE DOAS RETURN AIR NODE is UNIT3 DOAS
My best guess, based on the nodes being referenced in the errors and the "AirLoopNum" variable, for the cause of the error is the heapump and DOAS Airloop nodes merging at the inlet and outlet of the zone in the ZoneHVAC:EquipmentConnections Nodelist inputs.
ZoneHVAC:EquipmentConnections,
Unit3_Zone, !- Zone Name
Unit3_Zone Equipment, !- Zone Conditioning Equipment List Name
Unit3_Zone Air Inlet NodeList, !- Zone Air Inlet Node or NodeList Name
, !- Zone Air Exhaust Node or NodeList Name
Unit3_Zone Air Node, !- Zone Air Node Name
Unit3_Zone Return Air NodeList; !- Zone Return Air Node or NodeList Name
NodeList,
Unit3_Zone Air Inlet NodeList, !- Name
Unit3_Zone Inlet Node, !- Node 1 Name
Unit3_Zone DOAS Supply Inlet; !- Node 2 Name
NodeList,
Unit3_Zone Return Air NodeList, !- Name
Unit3_Zone Return Air Node, !- Node 1 Name
Unit3_Zone DOAS Return Air Node; !- Node 2 Name
This made me question whether or not the AirFlowNetwork can handle more than one AirLoop serving the same zone. I'm not asking anyone to fix my model, just a yes or no if the AirFlowNetwork can handle what I'm trying to do. If yes, is there an example file demonstrating?
