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how to model a hydronic heating system?

Dear all. I'm trying to model an hydronic heating system with high temperature radiators in a single thermal zone school building with natural ventilation and without cooling. I've selected an "empty plan loop" where i've dragged a "gas boiler" and a "HW heating coil". image description In the "Thermal zone" i've defined the "Zone equipment" with a "natural ventilation" and "high temp radiators" and the Heating termostat schedule". image description

When I run the simulation the following fatal error occour: Last severe error=<root>[Coil:Heating:Water][HW Htg Coil] - Missing required property 'air_outlet_node_name' I've read some topic about this problem but i do not try to fix it. I'd be grateful if there was someone who could help me. I attach also the *.osm file. Thank you very much

how to model a hydronic heating system?

Dear all. I'm trying to model an hydronic heating system with high temperature radiators in a single thermal zone school building with natural ventilation and without cooling. I've selected an "empty plan loop" where i've dragged a "gas boiler" and a "HW heating coil". image description In the "Thermal zone" i've defined the "Zone equipment" with a "natural ventilation" and "high temp radiators" and the Heating termostat schedule". image description

When I run the simulation the following fatal error occour: Last severe error=<root>[Coil:Heating:Water][HW Htg Coil] - Missing required property 'air_outlet_node_name' I've read some topic about this problem but i do not try to fix it. I'd be grateful if there was someone who could help me. I attach also the *.osm file. Thank you very much

how to model a hydronic heating system?

Dear all. I'm trying to model an hydronic heating system with high temperature radiators in a single thermal zone school building with natural ventilation and without cooling. I've selected an "empty plan loop" where i've dragged a "gas boiler" and a "HW heating coil". image description In the "Thermal zone" i've defined the "Zone equipment" with a "natural ventilation" and "high temp radiators" and the Heating termostat schedule". image description

When I run the simulation the following fatal error occour: Last severe error=<root>[Coil:Heating:Water][HW Htg Coil] - Missing required property 'air_outlet_node_name' I've read some topic about this problem but i do not try to fix it. I'd be grateful if there was someone who could help me. I attach also the *.osm file. Thank you very much