All, I am modeling a large research tower, 470,000 SF.? On past projects, all of the HVAC systems were 100% outdoor air with heat pipe energy recovery.? On this project, we will be returning part of the building, yielding 81% outdoor air.? I am trying to model the energy savings.? Equest is actually showing an increase in utility costs for going from 100% to 81%, both with and without energy recovery, which is the opposite of what I expected.? Both versions of the baseline have economizer.? If I compare the utility consumption, it looks as if the fan energy has increased significantly by decreasing the amount of outdoor air (entered as a fraction on the system outdoor air tab) and the cooling energy has increased a little.
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Does anyone have any idea what combination of inputs that I have that would lead to this problem?? It seems to me that these results couln't be valid.
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Thanks,
Maria Ramos, PE