Hi All, I am working on a LEED Energy model for a 8 floor Office Building. The Baseline System type I have is Type 8 -VAV with PFP boxes / Chilled Water-cooling, Electric Heating. Now, the proposed building has Water cooling unitary units with a single Outside Air unit. The outside air is supplied to mechanical room on each floor through a ducted shaft with each floor having its own VAV box to control the OA. Also, there is one single cooling tower that is used as a Heat rejection equipment. I am doing this model in TRACE, so all the trace experts are welcomed to answer this as well. 1. Since i have a Dedicated Outside Air Unit, I should model the outside air fan for the baseline as well and allow it be sized based on PRM method ? Now, TRACE does not allow me to create a overall Air side system type Outside air unit and thus i have to basically provide a Optional Ventilation fan on each unit (i guess this is limitation but i cant think of other way) for the Baseline. Also, TRACE only allows 90.1 Fan power adjustment to Primary fan (Supply fan) so i will not be able to take any credit for fan power adjustment on Outside air fan for using better filters. Similarly, for proposed building i have to model the Optional Ventilation Fan but this would be based on my actual selection. The selection i have is for Dedicated Outside Air fan. Is it safe to assume the proposed outside air fan power in "KW/CFM" from the actual selection for the energy consumption? 2. Similar to point 1, TRACE does not allow to create a single plant as a heat rejection equipment for all the Indoor units. Thus, based on my selection for cooling tower , condenser water pump, is it safe to simulate the proposed building with cooling tower and pump for each water cooled unitary system with the same KW/TON and Watts/GPM respectively? Finally, if i can do the above mentioned things in simulation, does anyone else have any experience with this kind of situation for the LEED model? I can explain everything in Narrative (that these are limitations of Modeling software) , however acceptance is based on who is reviewing this. Any thoughts, suggestions are greatly appreciated. -- Thanks Sincerely, Amit Bhansali, LEED Green Associate, M.S. , EIT