[BLDG-SIM] [Campus Chilled Water] eQUEST: Central Chiller for Baseline?

[Yoko Matsuyama]

Jon,

What if I assume the building is purchasing seam and chilled water from
campus facility, therefore I am using steam meter and chilled water meter (
G3.1.1.1 and TABLE 11.3.2A).
At the same time, I am wondering if LEED counts any credit for
campus central plants that corporate renewable energy...

Stanford University provides steam $20.12/1000 lb, chilled water $.3040/
ton-hr and electricity $0.1035/kWh


Yoko


On 10/18/07, Jon Evans <jevans at sustaineng.com> wrote:
>
>   Sam and others,
>
>
>
> I have a follow-up question related to your response on 9/25 to purchased
> chilled water and LEED modeling.
>
>
>
> I have a baseline building using ASHRAE 90.1 System 1 (PTAC Units). The
> proposed building is using campus chilled water and fan coil units or water
> source heat pumps.  Do I use electric as the source for the PTAC cooling, or
> the campus chilled water? Using campus chilled water with PTAC units is not
> a realistic option, but it seems like 90.1/LEED requires this (Table
> 11.3.2A in 90.1-2004)- would USGBC consider this fuel switching?
>
>
>
> Also, as a general survey, what are the going rates for campus chilled
> water and steam?  I have seen ~$0.70/therm chilled water (generated by
> absorption chillers) and $0.35/therm for steam for a college dormitory. I
> think these rates will vary by campus and end use.
>
>
>
> Thanks for your guidance in advance.
>
>
>
> -Jon
>  ------------------------------
>
> *From:* BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] *On Behalf Of *Sam
> Mason
> *Sent:* Tuesday, September 25, 2007 8:31 AM
> *To:* BLDG-SIM at gard.com
> *Subject:* [BLDG-SIM] eQUEST: Central Chiller for Baseline?
>
>
>
> Yoko,
>
> In note 5 under Table 11.3.2A, 90.1-2004 says for systems using purchased
> chilled water, no chillers shall be modeled and CHW costs shall be
> determined using the adopting authority's utility rates.  For both the
> baseline and proposed buildings, you would not include central chillers and
> instead use purchased chilled water.
>
>
>
> Sam
>
>
>
> --
> Sam Mason
> Atelier Ten
> sam.mason at atelierten.com
>
>  ------------------------------
>
> *From:* BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] *On Behalf Of *Yoko
> Matsuyama
> *Sent:* Monday, September 24, 2007 8:09 PM
> *To:* BLDG-SIM at gard.com
> *Subject:* [BLDG-SIM] eQUEST: Central Chiller for Baseline?
>
>
>
> Hi, everyone,
>
>
>
> I am modeling a building that is served chilled water from a central
> chiller, and the building doesn't have any individual chiller.
>
> I am wondering if  the baseline model (by ASHRAE 90.1-2004) should
> follow ASHRAE specified "type and number of chillers" (TABLE G3.1.3.7,
> ASHRAE 90.1-2004) depending on building conditioned floor area,
> or it should be modeled with a Central chiller as proposed/designed model.
>
>
>
> Thank you for your help
>
>
>
>
>
> YM
>
> Graduate Mechanical Engineer
>
>
>
>
>
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