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how to model a hydronic heating system?

asked 2020-07-07 08:56:48 -0600

lorenzo.belussi's avatar

updated 2020-07-09 10:03:10 -0600

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

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The term "high temperature water" is reserved for > 300 degrees. I assume you don't mean this....

TheEnergyTutor's avatar TheEnergyTutor  ( 2020-07-16 07:07:53 -0600 )edit

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answered 2020-07-08 12:59:15 -0600

updated 2020-07-10 13:10:48 -0600

Coil heating water is intended to be used in an air loop.

You should rather use ZoneHVAC:Baseboard:RadiantConvective:Water obj that is what better reperesent your "high temperature radiators"

UPDATE: Better explanation based on OS interface:

You have to add Baseboard Convective Water or a Baseboard Radiant Convective Water in Thermal Zone Tab, under Zone Equipment to each zone served by the loop (see figure below, depending if you want to give it some radiative contribution), then link them to the HW loop; finally in HVAC System tab wou will se them in the corresponding HW loop.

image description

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Asked: 2020-07-07 08:56:48 -0600

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Last updated: Jul 10 '20