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EnergyPlus CooledBeam

asked 2023-06-16 02:48:46 -0500

Lukas_V's avatar

updated 2023-06-16 12:36:37 -0500

Hi! I'm trying to model passive chilled beams in my model with the EnergyPlus block: AirTerminal:SingleDuct:ConstantVolume:CooledBeam by choosing for passive in Cooled Beam Type. The IO reference states that air inlet and outlet nodes should be assigned, although a passive chilled beam has no primary air supply. I find it difficult what to do with these air inlet and outlet nodes, I've tried them in an air loop and as outdoor air nodes but this problems because another air loop with CAV Reheat is already present. I only found example files with active chilled beams, anyone who has experience with passive chilled beams in EnergyPlus?

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answered 2023-06-17 03:33:29 -0500

Keigo's avatar

AirTerminal:SingleDuct:ConstantVolume:CooledBeam requires air inlet and outlet nodes even if you select Passive for Cooled Beam Type. If you want to supply fresh air with another AirLoop (CAV with Reheat), please set Supply Air Volumetric Flow Rate 0m3/s.

You can model multiple AirLoops serving a single thermal zone. So, one zone can have AirTerminal:SingleDuct:ConstantVolume:CooledBeam and AirTerminal:SingleDuct:ConstantVolume:Reheat. You should take care of how to input ZoneHVAC:EquipmentConnections. One zone has only one Zone Air Inlet Node or NodeList Name and one Zone Return Air Node or NodeList Name. You need to use NodeList.

Example:

ZoneHVAC:EquipmentConnections,
    Zone_1,       !- Zone Name
    Zone_1 Equipment,  !- Zone Conditioning Equipment List Name
    Zone_1 Supply Inlets,  !- Zone Air Inlet Node or NodeList Name
    ,                        !- Zone Air Exhaust Node or NodeList Name
    Zone_1 Zone Air Node,  !- Zone Air Node Name
    Zone_1 Return Outlets;  !- Zone Return Air Node or NodeList Name

NodeList,
    Zone_1 Supply Inlets,   !- Name
    Zone_1 CooledBeam Supply Inlet,  !- Node 1 Name
    Zone_1 CAV Supply Inlet;  !- Node 2 Name

NodeList,
    Zone_1 Return Outlets,   !- Name
    Zone_1 CooledBeam Return Outlet,  !- Node 1 Name
    Zone_1 CAV Return Outlet;  !- Node 2 Name
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answered 2023-06-23 08:17:25 -0500

Lukas_V's avatar

Hi, Thank you for your reaction. After implementing the nodelists, I keep getting this error:

* Severe * The outlet air node from the AirTerminal:SingleDuct:ConstantVolume:CooledBeam = SPACE 1 COOLEDBEAM * ~~~ *did not have a matching Zone Equipment Inlet Node, Node =SPACE 1 CB OUT NODE I have tried a lot of node configurations but I keep getting stuck here. Is anyone maybe interested of taking a look into my idf file? (https://drive.google.com/file/d/1MM8p...) Thanks in advance, Lukas

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Comments

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EnergyPlus9.6_TwoAirLoops_rev.idf

Node connection errors were fixed. The severe error "Plant temperatures are getting far too hot" is another issue. I don't know how you modeled your idf file, but your Node connections are messy. Please compare the revised file with your original file, especially NodeList, AirLoopHVAC:ZoneMixer and Coil:Heating:Water. I highly recommend to sketch the air-side schematic with each component and Node name for your understanding.

Keigo's avatar Keigo  ( 2023-06-23 09:40:06 -0500 )edit

Thanks a lot for looking into my idf file. I'll work on the node connections and the plant temperature errors. Lukas

Lukas_V's avatar Lukas_V  ( 2023-06-23 09:49:47 -0500 )edit

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Asked: 2023-06-16 02:48:46 -0500

Seen: 73 times

Last updated: Jun 23 '23