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The typical solution to modeling a residential ERV is to use the ZoneHVAC:EnergyRecoveryVentilator object. The advantages of this object are that it's easy to work with, incorporates the heat exchanger, can easily be scheduled with constant airflow, and automatically interfaces with outdoor air. The disadvantage is that it can't handle supply air from one zone and exhaust air from a different zone (if that's what you are trying to accomplish with your 4-zone model). Perhaps you can use this object in conjunction with ZoneMixing objects to approximate this effect.

The typical solution to modeling a residential ERV is to use the ZoneHVAC:EnergyRecoveryVentilator object. The advantages of this object are that it's easy to work with, incorporates the heat exchanger, can easily be scheduled with constant airflow, and automatically interfaces with outdoor air. The disadvantage is that it can't handle supply air from to one zone and exhaust air from a different zone (if that's what you are trying to accomplish with your 4-zone model). Perhaps you can use this object in conjunction with ZoneMixing objects to approximate this effect.