[Equest-users] 100% outdoor air system
mramos at innovaengineers.com
Mon Sep 24 11:44:25 PDT 2012
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.
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.
Maria Ramos, PE
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