Any thoughts on using a System -> Preconditioner -> Add-On Desiccant for modeling a passive dehumidification wheel in the configuration shown below?
It would be a workaround. One problem I see is the Add-On Desiccant doesn't interact with the return air. You would have to derate the total energy wheel somehow, such as by reducing the effectiveness or decreasing the exhaust airflow.

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Thanks,
Bill

William Bishop, PE, BEMP, BEAP, LEED AP