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Hi everyone,

I'm trying to add a fan in relief air from AirLoopHVAC:OutdoorAirSystem to control the ratio between Outdoor air and Return air in mixing box (by control the air flowrate between relief air and mixed air, because I could not place fan in outdoor air and return air). When I add Fan:VariableVolume in Relief Air, it warned me errors:

* Severe * GetAirPathData: AirLoopHVAC="WEST ZONE AIR SYSTEM", connection to zone. * ~~~ * No Connection found for Return Air from Zone * ~~~ * Expected node name ="WEST ZONE RETURN AIR NODE".

I modified from examples 2ZoneDataCenterHVAC_wEconomizer.idf .This is my current file [2ZoneDataCenterHVAC_wEconomizer_Temp_Fan.idf].(https://drive.google.com/file/d/1H_HQmi7khFvWftCk1aOkeljB-maUIYoW/view?usp=sharing) in EnergyPlus.

I am very happy with your helps. Thank you all.

Hi everyone,

I'm trying to add a fan in relief air from AirLoopHVAC:OutdoorAirSystem to control the ratio between Outdoor air and Return air in mixing box (by control the air flowrate between relief air and mixed air, because I could not place fan in outdoor air and return air). When I add Fan:VariableVolume in Relief Air, it warned me errors:

** Severe  * ** GetAirPathData: AirLoopHVAC="WEST ZONE AIR SYSTEM", connection to zone.
 * **   ~~~   * ** No Connection found for Return Air from Zone
 * **   ~~~   * ** Expected node name ="WEST ZONE RETURN AIR NODE".
NODE".