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Hi there, I'll need to model a makeup air unit in OpenStudio that has its fan running at high speed during the daytime and low speed (50% flow rate) at night. I put in a VFD fan on the MUA, adjusted its availability schedule and minimum flow fraction, but no changes happen. Do I have to add a customized EMS EnergyPlus script to make this work?

Thanks Xia

Hi there, I'll need to model a makeup air unit in OpenStudio that has its fan running at high speed during the daytime and low speed (50% flow rate) at night. I put in a VFD fan on the MUA, adjusted its availability schedule and minimum flow fraction, but no changes happen. Do I have to add a customized EMS EnergyPlus script to make this work?

Thanks Xia

Hi there, I'll need to model a makeup air unit in OpenStudio that has its fan running at high speed during the daytime and low speed (50% flow rate) at night. I put in a VFD fan on the MUA, adjusted its availability schedule and minimum flow fraction, but no changes happen. Do I have to add a customized EMS EnergyPlus script to make this work?

Thanks Xia