HeatPump:PlantLoop:EIR Outdoor Air Nodes

asked 2024-12-04 17:52:46 -0600

QCeng

31 ●4

updated 2024-12-05 10:10:00 -0600

Aaron Boranian

14250 ●86 ●24 http://bigladdersoftware.com/

Hi,

I wish to simulate a central HVAC system using an Air to Water Heat Pump. I know that this feature is not available in OpenStudio so I just exported my OSM file to IDF and made the changes accordingly.

The thing I have trouble understanding is how to add outdoor air nodes to the Source Side Inlet Node Name and Source Side Outlet Node Name of HeatPump:PlantLoop:EIR:Cooling and HeatPump:PlantLoop:EIR:Heating components.

I select AirSource as condenser type but I don't have any options for Outdoor Air Nodes and it seems I can't create new ones?

When I look at an example online ( link text ) they put Outdoor Air Inlet Node and Outdoor Air Outlet Node but the last one is not even listed in the nodes list? Am I missing something?

Thank you!

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answered 2024-12-05 10:15:54 -0600

Aaron Boranian

14250 ●86 ●24 http://bigladdersoftware.com/

@QCeng In your IDF, "Outdoor Air Inlet Node" is defined as an OutdoorAir:Node object type, which tells EnergyPlus that specific node in the model matches weather data.

OutdoorAir:Node,
  Outdoor Air Inlet Node;     ! Name

"Outdoor Air Outlet Node" is what's picked up heat from the condenser and rejected outdoors, so it's just a node name for reference and not connected to any other HVAC component or EnergyPlus object. You can request system node output variables (flow rate, temperature, etc.) for "Outdoor Air Outlet Node" to confirm that it is at a different state than "Outdoor Air Inlet Node" when the heat pump operates.

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Thank you Aaron but my issue was that I didn't have any other Outdoor Air Node, just one "Outdoor Air Inlet Node". If I selected it for all the OA nodes in the HeatPump cooling and heating objects it would throw an error.

QCeng ( 2024-12-10 02:14:18 -0600 )edit

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answered 2024-12-10 02:21:55 -0600

QCeng

31 ●4

I think I have solved my issue. I simply added four new outdoor air nodes in OutdoorAir:NodeList and assigned them to the Source Side Inlet Node Name and Source Side Outlet Node Name of HeatPump:PlantLoop:EIR:Cooling and HeatPump:PlantLoop:EIR:Heating.

I am still wondering how the code in the link in my first post could work though because it just has one outdoor air node defined.

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