suspiciously high savings in auxillary power

high savings in auxillary power Hi we are modelling a 18 storey office block in Sap Paulo and getting some results we wanted to cross check, as we doing the energy model for the first time... Description of the model: Our proposed building has 30% less Energy DEMAND than the Baseline building. The proposed building uses a fan coil system with minimum fresh air provision. The baseline model utilises a PFP VAV system (no.8 according to ASHRAE classification). Fresh air flow rates between Baseline and Proposed buildings are the same – i.e. around 7.5l/s/p. Both Buildings have heat recovery and similar SFPs. The proposed building uses a rather mediocre Air Cooled chiller – COP of 2.8 - whilst the baseline building uses a highly efficient Water Cooled Chiller – COP of 5.5. The problem we are doubtful about is: The proposed building’s auxiliary energy Consumption is around 80kWh/m2, whilst the Baseline’s auxiliary energy consumption is around 400kWh/m2 – i.e. 500% more. Does this sound NORMAL ? What kind of auxiliary energy CONSUMPTION (kWh/m2) is reasonable for a VAV system with PFPs doing 7.5l/s/p fresh air? Of course there will be some recirculation, but can this justify 5 times more energy consumption spend on auxiliary? Thanks for the help in advance regards S.