[Equest-users] Number of systems required by 90.1?

[James Hansen]

I'm working on a model of a 5-story building - my Proposed system is
floor-by-floor chilled water AHUs connected to a water-cooled chiller
central plan.  Airside is shutoff VAV boxes with hot water reheat.

 

For the size of the building, the baseline model is almost identical.
It is System 7 - Packaged rooftop VAV system with reheat boxes, chilled
water, hot water boilers.

 

My question is whether or not the Baseline model has to have a single
system for the building, or should it have 5 separate RTUs (doesn't
really make any sense) since my proposed building has 5 systems?

 

I'm pretty sure the answer is that the Baseline should just have one
packaged RTU for the building, but it actually makes a big difference on
energy use.  By breaking the systems down into one-per-floor, as is the
case with the proposed model, I end up saving a LOT of energy, possibly
because the 1st floor is slab-on-grade, and the 5th floor has a roof. 

 

Just wanted to make sure I have the correct number of "systems" for the
Baseline model.

 

Thanks!

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

www.ghtltd.com <http://www.ghtltd.com/> 


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