Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

Can 1 AHU (cooling coil) set in more than one plant loop

asked 2022-06-28 06:14:50 -0500

Abee's avatar

updated 2022-06-29 12:05:17 -0500

I am setting 3 refrigerant loops for 3 chillers. I need to split the chiller into 3 loops because I cannot find how to schedule the chillers (their on/off schedules are not the same). But every chiller connect with every AHU in the building (the difference is just their on/off schedule) but when I split the loops and drag the AHU to the refrigerant loops, I have found that 1 AHU can only place in only 1 plant loop (when I drag AHU to another loop, the AHU in the first loop has gone). I would like to ask if there is any way to schedule chillers in the same loop or set AHU to many plant loops. Thank you

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2022-06-29 02:26:00 -0500

The easiest way in OpenStudio ([1]) is probably to model 3 PlantLoops with one chiller on the supply side. Put an AvailabilityManager:Scheduled on each plant loop to turn it off when you don't want the chiller operating.

Place an ideal HeatExchanger:FluidToFluid (HX) on the demand side, set the Control Type to CoolingSetpointModulated

Each of the three primary loops would look like this:

One of the 3 primary loops

Make a secondary PlantLoop, with the three HX on the supply side, and the AHU coils on the demand side.

Secondary Loop

[1] Note: In EnergyPlus, I would probably make it one loop and tweak the PlantEquipmentOperationSchemes with 3 PlantEquipmentOperationCoolingLoad each with one chiller, that I would schedule On/Off, but in OpenStudio that is not possible

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer


Question Tools

1 follower


Asked: 2022-06-28 06:14:50 -0500

Seen: 86 times

Last updated: Jun 29 '22