Can IdealLoadsAirSystem be used in conjunction with both AirflownetWork and AirLoopHVAC at the same time?

asked 2022-08-19 02:21:03 -0600

yoshiwara's avatar

updated 2022-08-19 08:54:50 -0600

Hi all,

I am considering simulating a model with AirflownetWork and AirLoopHVAC in EnergyPlus Version 22.1. When I added ZoneHVAC:IdealLoadsAirSystem to that model, I got errors. Is it possible to use all of these functions together at the same time?

The steps I have tried are as follows: (The IDF files can be obtained from the following link.)

Step1 : I created a base model using AirflowNetwork. (OK)

Step2 : I added an air distribution unit in zone N00 based on the model in step1. (OK)

Step3 : Based on the model from step2, ZoneHVAC:IdealLoadsAirSystem was added to zone N02. The following error messages were displayed. Here, ZONE_N02_INLET and ZONE_N02_OUTLET are air inlet node and return air node of ZoneHVAC:EquipmentConnections in zone N02.

* Severe * ValidateDistributionSystem: 'ZONE_N02_INLET' is not defined as an AirflowNetwork:Distribution:Node object.

* Severe * ValidateDistributionSystem: 'ZONE_N02_OUTLET' is not defined as an AirflowNetwork:Distribution:Node object.

* Fatal * ValidateDistributionSystem: Program terminates for preceding reason(s).

Step4 : Based on the model in step3, I removed the return air node designation from ZoneHVAC:EquipmentConnections in zone N02. The error messages from step3 disappeared, but the following error message appeared instead.

* Fatal * InitPurchasedAir: In ZoneHVAC:IdealLoadsAirSystem = ZONE_N02_IDEALLOADS

...Summary of Errors that led to program termination:

..... Reference severe error count=0

Note that when I created a model that does not use air distribution unit and uses both AirflorNetwork and ZoneHVAC:IdealLoadsAirSystem, the calculation was successfully performed without defining AirflowNetwork:Distribution:Node. Zone N02, to which I added ZoneHVAC:IdealLoadsAirSystem in step 3, should not be related to Air Loop of zone N00, but does it need AirflowNetwork:Distribution:Node? If so, what Air Loop circuit should I build?

If you know how to solve the above problem or how to use these functions together, I would appreciate it if you could let me know.


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