[Bldg-sim] Baseline and Proposed HVAC system

[R B]

Amit,
On your second question - as far as I remember (this is 2004 standard), the
mandatory occupancy sensors are on a space basis. So if you have occupancy
sensors in more spaces than what is mandatory, you can have the savings due
to them in these extra spaces. If the baseline does not have LED lighting,
then the proposed will have lower lighting wattage than baseline, giving you
lighting savings.
-Rohini

Rohini Brahme, Ph.D., LEED AP
Building energy analysis, tool development, and training
Dallas/Fort Worth, TX

On Wed, Sep 29, 2010 at 10:58 AM, amit bhansali <amitbhansali7 at gmail.com>wrote:

> Hello all,
> There are two things that are confusing me right now:
> 1. I am trying to understand a comment that we recieved from GBCI regarding
> the HVAC system that we used to model one of our projects. It is a existing
> building with AHU's, Chillers, Electric Heat and FPB's with a square footage
> of about 90000sf. I understand that the according to table G3.1.1B , the
> HVAC system should be Type 6 and should have a direct expansion type cooling
> and not a chiller for the baseline building. However, since the existing
> building already has a chilled and the proposed would have a new more
> efficient chiller, shouldnt i model the baseline with a chiller as well
> since the existing building already has a chiller. Does anyone have
> experience with this?
> The renovation in the building is a major one.
>
> 2. Since the building is more than 5000sq ft , it has a mandatory
> requirement of having occupancy sensors/motion sensors installed in the
> baseline case. Now again, the existing building didnt have any motion or
> occupancy sensors and did not have the LED lighting as in proposed building.
> But since having the sensors is mandatory , do i not get any categpry for
> having occupancy sensors? Also, if the occupancy sensors are to be modeled
> should the percentage reduction in LPD to account for it in the simulation
> from Table G3.2 be taken into consideration in Baseline as well as proposed
> which would essentially mean that i would have no energy savings for
> lighting?!!
>
> Your help is highly appreciated.
>
> --
> Thanks
>
> Sincerely,
> Amit Bhansali, M.S. , EIT
> Command Commissioning, LLC
> 8410, Sterling St
> Irving, TX  75063
>
> Office :(972)-929-1199 (Ext:328)
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