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[EnergyPlus_Support] Two AirloopHVAC serving the same zones





Dear EnergyPlus experts,

I'm preparing a model for LEED for a building with multiple zones which has ventilation system for fresh air and a separate heating system.

By design, there's no cooling system in the building.

I've used a single AirLoopHVAC to model the system for fresh air since it serves more than one zones.

I think that the ERV and Outdoor Air Unit systems are not applicable for my case since this would be a major difference with the project docs.

Since by design the building doesn't have a cooling system, it's necessary that in the Proposed and Baseline cooling systems are the same: a Packaged VAV with Reheat.

And here is the problem!

In order to model a Packaged VAV with Reheat, I need to use one more AirLoopHVAC, correct?
This shouldn't work since each zone has only a single Return Air Node and in the zones which have a ventilation system for fresh air, this Return Air Node is already used by its AirLoopHVAC!

And I don't know how to handle Two AirloopHVAC serving the same zones...

I've already spent a few days on this problem but yet I cannot find of a suitable solution.
Any ideas on how to proceed greatly appreciated!

Thank you very much,
Martin


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